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Li C, Hassan A, Palmai M, Xie Y, Snee PT, Powell BA, Murdoch LC, Darnault CJG. Experimental measurements and numerical simulations of the transport and retention of nanocrystal CdSe/ZnS quantum dots in saturated porous media: Effects of electrolytes, organic ligand, and natural organic matter. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 897:165387. [PMID: 37423289 DOI: 10.1016/j.scitotenv.2023.165387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 06/21/2023] [Accepted: 07/06/2023] [Indexed: 07/11/2023]
Abstract
This study explores the transport and retention of CdSe/ZnS quantum dot (QD) nanoparticles in water-saturated sand columns as a function of electrolytes (Na+ and Ca2+), ionic strength, organic ligand citrate, and Suwannee River natural organic matter (SRNOM). Numerical simulations were carried out to understand the mechanisms that govern the transport and interactions of QDs in porous media and to assess how environmental parameters impact these mechanisms. An increase in the ionic strength of NaCl and CaCl2 increased QDs retention in porous media. The reduction of the electrostatic interactions screened by dissolved electrolyte ions and the increase of divalent bridging effect are the causes for this enhanced retention behavior. Citrate or SRNOM enhanced QDs transport in NaCl and CaCl2 systems by either increasing the repulsion energy barrier or inducing the steric interactions between QDs and the quartz sand collectors. A non-exponential decay characterized the retention profiles of QDs along the distance to the inlet. The modeling results indicated the four models containing the attachment, detachment, and straining terms - Model 1: M1-attachment, Model 2: M2-attachment and detachment, Model 3: M3-straining, and Model 4: M4-attachment, detachment, and straining - closely simulated the observed breakthrough curves (BTCs) but inadequately described the retention profiles.
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Affiliation(s)
- Chunyan Li
- Department of Environmental Engineering and Earth Sciences, School of Civil and Environmental Engineering and Earth Sciences, Clemson University, 342 Computer Court, Anderson, SC 29625, USA
| | - Asra Hassan
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor St., Chicago, IL 60607, USA
| | - Marcell Palmai
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor St., Chicago, IL 60607, USA
| | - Yu Xie
- Department of Environmental Engineering and Earth Sciences, School of Civil and Environmental Engineering and Earth Sciences, Clemson University, 342 Computer Court, Anderson, SC 29625, USA
| | - Preston T Snee
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor St., Chicago, IL 60607, USA
| | - Brian A Powell
- Department of Environmental Engineering and Earth Sciences, School of Civil and Environmental Engineering and Earth Sciences, Clemson University, 342 Computer Court, Anderson, SC 29625, USA
| | - Lawrence C Murdoch
- Department of Environmental Engineering and Earth Sciences, School of Civil and Environmental Engineering and Earth Sciences, Clemson University, 342 Computer Court, Anderson, SC 29625, USA
| | - Christophe J G Darnault
- Department of Environmental Engineering and Earth Sciences, School of Civil and Environmental Engineering and Earth Sciences, Clemson University, 342 Computer Court, Anderson, SC 29625, USA.
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2
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Ji H, Liu Z, Jiang W. Transport behavior of nanoplastics in activated carbon column. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:26256-26269. [PMID: 36355238 DOI: 10.1007/s11356-022-24056-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Accepted: 11/02/2022] [Indexed: 06/16/2023]
Abstract
Nanoplastics can be produced directly from some artificial products, such as cosmetics, or indirectly from the breakup of large pieces of plastic waste. They have a small particle size, large specific surface area, and stable structure and can concentrate toxic compounds in water. The discharge of nanoplastics into the water environment through urban piping systems or surface runoff may lead to the contamination of surface water resources, which poses a great threat to the safety of drinking water. As a common adsorbent, granular activated carbon (GAC) is widely used in the advanced treatment of drinking water. However, most of the studies focused on the transport ability of nanoplastics in quartz sand, and there is a lack of research on the migration behavior of nanoplastics in activated carbon media. In this study, the stability and pore characteristics of GAC were studied, and its regeneration efficiency was investigated. The transport curves of PSNPs, which have a particle size of 98 ± 9 nm and specific surface area of about 67 m2/g, were compared under different ionic strengths, ionic species, flow rates, pH, and humic acid (HA) concentrations. And DLVO theory was used to analyze the transport behavior of nanoplastics in activated carbon column. All experiments were performed at room temperature to make the results generalizable. The results showed that GAC had stable pore structure and excellent adsorption capacity. The surface area and pore volume of GAC are 759 m2/g and 0.357 cm3/g, respectively. And the regeneration rate of GAC can reach 90% and 83.3% after the first two regeneration cycles. On the other hand, at high ionic strength and low pH, the repulsive barrier between PSNPs and activated carbon gradually disappeared; then, more PSNPs were deposited in the activated carbon media, and the concentration of PSNPs in the effluent water was lower. Both the flow rate and HA promoted the transport of PSNPs, but the breakthrough curves of PSNPs did not change significantly when the HA concentration was further increased. At the same ion concentration, PSNPs tend to deposit on the surface of activated carbon in the background solution of Ca2+ compared with Na+. This study reveals the migration mechanism of PSNPs in the activated carbon filter column, which is of great importance to ensure the safety of drinking water and human health.
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Affiliation(s)
- Hongliang Ji
- School of Resources and Environment, Nanchang University, No. 999 Xuefu Avenue, Honggutan District, Nanchang, 330031, Jiangxi, China
| | - Zhenzhong Liu
- School of Resources and Environment, Nanchang University, No. 999 Xuefu Avenue, Honggutan District, Nanchang, 330031, Jiangxi, China.
| | - Wen Jiang
- School of Resources and Environment, Nanchang University, No. 999 Xuefu Avenue, Honggutan District, Nanchang, 330031, Jiangxi, China
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The effects of pH, ionic strength, and natural organics on the transport properties of carbon nanotubes in saturated porous medium. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129025] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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4
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Ghosh D, Das S, Gahlot VK, Pulimi M, Anand S, Chandrasekaran N, Rai PK, Mukherjee A. Nano-SiO 2 transport and retention in saturated porous medium: Influence of pH, ionic strength, and natural organics. JOURNAL OF CONTAMINANT HYDROLOGY 2022; 248:104029. [PMID: 35653834 DOI: 10.1016/j.jconhyd.2022.104029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 04/30/2022] [Accepted: 05/22/2022] [Indexed: 06/15/2023]
Abstract
Nano silica (nSiO2), induces potential harmful effects on the living environment and human health. It is well established that SiO2 facilitates the co-transport of a variety of other contaminants, including heavy metals and pesticides. The current study focused on the systematic evaluation of the effects of multiple physicochemical parameters such as pH (5, 7, and 9), ionic strength (10, 50, and 100 mM), and humic acid (0.1, 1, and 10 mg/L) on the transport and retention of nSiO2 in saturated porous medium. Additionally, the influent concentration of nSiO2 (10, 50, and 100 mg/L) was also varied. Our experimental findings indicate that the size of nSiO2 aggregates was directly related to the pH, ionic strength, HA, and particle concentration had a significant impact on the breakthrough curves (BTCs). The stability provided by the varying concentrations of pH and humic acid had a significant effect on the size of nSiO2 aggregates and transport (C/C0 > 0.7). The presence of a greater magnitude of negative charge on the surface of both nSiO2 and quartz sand resulted in less aggregation and enhanced flow of nSiO2 through the sand column. The Electrostatic and steric repulsion forces were the primary governing mechanisms in relation to the size of nSiO2 aggregates, affecting the single-collector efficiency and attachment efficiency, which determined the maximal transport of nSiO2. Conversely, a probable increase in Van der Waals force of attraction exacerbated the particle deposition and reduced their mobility for high ionic strength, and particle concentrations (C/C0 < 0.1). The formation of large nSiO2 aggregates, in particular, was principally responsible for the enhancement of nSiO2 retention in sand columns over a broad range of IS and particle concentration. The interaction energy profiles based on the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory were determined to understand the mechanism of nSiO2 deposition. Aditionally, all the experimental BTCs were mathematically simulated and justified by the colloidal filtration theory (CFT). Considering the environmental ramifications, the transport behavior of nSiO2 was further evaluated in various natural matrices such as river, lake, ground, and tap water. The nSiO2 suspended in the river, lake, and tap water had significantly higher mobility (C/C0 > 0.7), whereas groundwater indicated higher retention (C/C0 < 0.3). The study advances our collective knowledge of physicochemical and environmental parameters that can affect particle mobility.
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Affiliation(s)
- Debayan Ghosh
- Centre for Nanobiotechnology, Vellore Institute of Technology, Vellore, Tamil Nadu, India
| | - Soupam Das
- Centre for Nanobiotechnology, Vellore Institute of Technology, Vellore, Tamil Nadu, India
| | - Vikas Kumar Gahlot
- Centre for Fire, Explosive and Environment Safety, Timarpur, Delhi 110054, India
| | - Mrudula Pulimi
- Centre for Nanobiotechnology, Vellore Institute of Technology, Vellore, Tamil Nadu, India
| | - Shalini Anand
- Centre for Fire, Explosive and Environment Safety, Timarpur, Delhi 110054, India
| | - N Chandrasekaran
- Centre for Nanobiotechnology, Vellore Institute of Technology, Vellore, Tamil Nadu, India
| | - Pramod Kumar Rai
- Centre for Fire, Explosive and Environment Safety, Timarpur, Delhi 110054, India
| | - Amitava Mukherjee
- Centre for Nanobiotechnology, Vellore Institute of Technology, Vellore, Tamil Nadu, India.
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5
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Weldick PJ, Wang A, Halbus AF, Paunov VN. Emerging nanotechnologies for targeting antimicrobial resistance. NANOSCALE 2022; 14:4018-4041. [PMID: 35234774 DOI: 10.1039/d1nr08157h] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Antimicrobial resistance is a leading cause of mortality worldwide. Without newly approved antibiotics and antifungals being brought to the market, resistance is being developed to the ones currently available to clinicians. The reason is the applied evolutionary pressure to bacterial and fungal species due to the wide overuse of common antibiotics and antifungals in clinical practice and agriculture. Biofilms harbour antimicrobial-resistant subpopulations, which make their antimicrobial treatment even more challenging. Nanoparticle-based technologies have recently been shown to successfully overcome antimicrobial resistance in both planktonic and biofilms phenotypes. This results from the combination of novel nanomaterial research and classic antimicrobial therapies which promise to deliver a whole new generation of high-performance active nanocarrier systems. This review discusses the latest developments of promising nanotechnologies with applications against resistant pathogens and evaluates their potential and feasibility for use in novel antimicrobial therapies.
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Affiliation(s)
- Paul J Weldick
- Department of Chemistry and Biochemistry, University of Hull, Hull, HU6 7RX, UK
| | - Anheng Wang
- Department of Chemistry and Biochemistry, University of Hull, Hull, HU6 7RX, UK
| | - Ahmed F Halbus
- Department of Chemistry, College of Science, University of Babylon, Hilla, Iraq
| | - Vesselin N Paunov
- Department of Chemistry, Nazarbayev University, Kabanbay Baryr Ave. 53, Nur-sultan city, 010000, Kazakhstan.
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6
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Xu G, Zheng Q, Yang X, Yu R, Yu Y. Freeze-thaw cycles promote vertical migration of metal oxide nanoparticles in soils. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 795:148894. [PMID: 34252772 DOI: 10.1016/j.scitotenv.2021.148894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 07/03/2021] [Accepted: 07/03/2021] [Indexed: 06/13/2023]
Abstract
Understanding the migration of engineered nanoparticles (ENPs) in soil is of great significance for evaluating the potential risks of ENPs to ecosystem. So far, their migration under freeze-thaw cycles (FTCs) has not been investigated. This study explored the impacts of FTCs on the migration of three commonly used ENPs, copper oxide (CuO-NPs), cerium oxide (CeO2-NPs), and zinc oxide (ZnO-NPs), in three types of soil. After 32 FTC cycles, the highest migration rate of ENPs was found in black soil due to its higher clay particle content. CeO2-NPs with low surface charge exhibited the highest mobility among three ENPs, which migrated to 9-11 cm layer with the concentration of 42.1 mg/kg in the black soil column. ZnO-NPs were less influenced by FTCs as they were adsorbed onto sand grains due to electrostatic interaction, which migrated to 3-5 cm layer with the concentration of 25.2 mg/kg in the black soil. Higher moisture contents (50% and 100%) resulted in increased migration depth of the ENPs in all soils. Lower freezing temperature (-25 °C) caused fragmentation of large soil particles and produced more clay colloids. FTCs promoted the movement of moisture, which penetrated the soil and thus facilitated the movement of ENPs by increasing the contents and movement of clay colloids. This work reveals the migration behavior of ENPs in soils in freeze-thaw period and provides insights into the fate and environmental risk of nanomaterial at middle and high latitudes.
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Affiliation(s)
- Guanghui Xu
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qiang Zheng
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; Department of Earth Sciences, Jilin University, Changchun 130106, China
| | - Xiutao Yang
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Rui Yu
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
| | - Yong Yu
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
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7
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Dong S, Xia J, Sheng L, Wang W, Liu H, Gao B. Transport characteristics of fragmental polyethylene glycol terephthalate (PET) microplastics in porous media under various chemical conditions. CHEMOSPHERE 2021; 276:130214. [PMID: 34088096 DOI: 10.1016/j.chemosphere.2021.130214] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 02/22/2021] [Accepted: 03/10/2021] [Indexed: 06/12/2023]
Abstract
Transport characteristics of fragmental polyethylene glycol terephthalate (PET) microplastics in porous media were elucidated via column experiments under a series combination of electrolytes, pH, and humic acid (HA) conditions. Fragmental PET microplastics showed low mobility in porous media with a small mass recovery rate (<50.1%) even under unfavorable retention conditions. The electrolyte, pH, and HA showed combined impact on PET microplastic transport. PET microplastics mobility was enhanced with decreasing electrolyte concentration, increasing pH, and increasing HA concentration. Basic properties (e.g. destiny and shape) of PET microplastics showed stronger effect on their transport behaviors in porous media rather than the experimental chemical conditions. In general, both environmental factors and basic properties played important roles in controlling the retention and transport of PET microplastics in porous media. A numerical model considering the second order kinetic deposition sites was applied to depict the retention and transport of PET microplastics in porous media. Model simulations well matched the experimental breakthrough curves. Given the fragmental PET microplastics have more realistic and irregular shapes, results from this study can improve present knowledge of the environmental fate and risk of microplastics in underground soil and water systems.
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Affiliation(s)
- Shunan Dong
- College of Agricultural Science and Engineering, Hohai University, Nanjing, 210098, China.
| | - Jihong Xia
- College of Agricultural Science and Engineering, Hohai University, Nanjing, 210098, China
| | - Liting Sheng
- College of Agricultural Science and Engineering, Hohai University, Nanjing, 210098, China
| | - Weimu Wang
- College of Agricultural Science and Engineering, Hohai University, Nanjing, 210098, China
| | - Hui Liu
- College of Agricultural Science and Engineering, Hohai University, Nanjing, 210098, China
| | - Bin Gao
- Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, 32611, United States
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8
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Li C, Hassan A, Palmai M, Xie Y, Snee PT, Powell BA, Murdoch LC, Darnault CJG. Experimental measurements and numerical simulations of the transport and retention of nanocrystal CdSe/ZnS quantum dots in saturated porous media: effects of pH, organic ligand, and natural organic matter. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:8050-8073. [PMID: 33051847 DOI: 10.1007/s11356-020-11097-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 10/01/2020] [Indexed: 06/11/2023]
Abstract
The risks of environmental exposures of quantum dot (QD) nanoparticles are increasing, but these risks are difficult to assess because fundamental questions remain about factors affecting the mobility of QDs. The objective of this study is to help address this shortcoming by evaluating the physico-chemical mechanisms controlling the transport and retention of CdSe/ZnS QDs under various environmental conditions. The approach was to run a series of laboratory-scale column experiments where QDs were transported through saturated porous media with different pH values and concentrations of citrate and Suwannee River natural organic matter (SRNOM). Numerical simulations were then conducted and compared with the laboratory data in order to evaluate parameters controlling transport. QD suspensions were injected into the column in an upward direction and ICP-MS used to analyze Cd2+ concentrations (C) in column effluent and sand porous media samples. The increase in the background solution pH values enhanced the QD transport and decreased the QD retention. QD transport recovery percentages obtained from the column effluent samples were 2.6%, 83.2%, 101.7%, 96.5%, and 98.9%, at pH levels of 1.5, 3.5, 5, 7, and 9, respectively. The effects of citrate and SRNOM on the transport and retention of QDs were pH dependent as reflected in the influence of the electrostatic and steric interactions between QDs and sand surfaces. QDs were mobile under unfavorable deposition conditions at environmentally relevant pHs (i.e., 5, 7, and 9). Under favorable pH conditions for deposition (i.e., 1.5), QDs were completely retained within the porous media. The retention profiles of QDs showed a non-exponential decay with distance to the inlet, attributed to multiple deposition rates caused by the QD particles and surface heterogeneities of the quartz silica sand. Results of the diameter ratios of QDs to the median sand grains, in suspensions of DI water at pH 1.5, of citrate at pH 1.5, and of citrate at pH 3.5 indicate straining as the dominating mechanism for QD retention in porous media. The blocking effect and straining were significant under favorable deposition conditions and the detachment effect was non-negligible under unfavorable deposition conditions. Physico-chemical attachment and straining are the governing mechanisms that control the retention of QDs. Overall, experimental results indicate that aggregation, deposition, straining, blocking, and DLVO-type interactions affect the advective transport and retention of QDs in saturated porous media. The simulations were conducted using models that include terms describing attachment, detachment, and straining terms-model 1: M1-attachment, model 2: M2-attachment and detachment, model 3: M3-straining, and model 4: M4-attachment, detachment, and straining. The results from simulations with M2-attachment and detachment and M4-attachment, detachment, and straining matched best the observed breakthrough curves, but all four models inadequately described the retention profiles. Our findings demonstrate that QDs are mobile in porous media under a wide range of physico-chemical conditions representative of the natural environment. The mobility behavior of QDs in porous media indicated the potential risk of soil and groundwater contamination.
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Affiliation(s)
- Chunyan Li
- Department of Environmental Engineering and Earth Sciences, Laboratory of Hydrogeoscience and Biological Engineering, L.G. Rich Environmental Laboratory, Clemson University, 342 Computer Court, Anderson, SC, 29625, USA
| | - Asra Hassan
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor St, Chicago, IL, 60607, USA
| | - Marcell Palmai
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor St, Chicago, IL, 60607, USA
| | - Yu Xie
- Department of Environmental Engineering and Earth Sciences, Laboratory of Hydrogeoscience and Biological Engineering, L.G. Rich Environmental Laboratory, Clemson University, 342 Computer Court, Anderson, SC, 29625, USA
| | - Preston T Snee
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor St, Chicago, IL, 60607, USA
| | - Brian A Powell
- Department of Environmental Engineering and Earth Sciences, Laboratory of Hydrogeoscience and Biological Engineering, L.G. Rich Environmental Laboratory, Clemson University, 342 Computer Court, Anderson, SC, 29625, USA
| | - Lawrence C Murdoch
- Department of Environmental Engineering and Earth Sciences, Laboratory of Hydrogeoscience and Biological Engineering, L.G. Rich Environmental Laboratory, Clemson University, 342 Computer Court, Anderson, SC, 29625, USA
| | - Christophe J G Darnault
- Department of Environmental Engineering and Earth Sciences, Laboratory of Hydrogeoscience and Biological Engineering, L.G. Rich Environmental Laboratory, Clemson University, 342 Computer Court, Anderson, SC, 29625, USA.
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Wang Y, Wan Q, Liu B, Wei Z, Zhang M, Tang Y. Co-transport and competitive retention of different ionic rare earth elements (REEs) in quartz sand: Effect of kaolinite. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 722:137779. [PMID: 32208243 DOI: 10.1016/j.scitotenv.2020.137779] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Revised: 03/01/2020] [Accepted: 03/05/2020] [Indexed: 06/10/2023]
Abstract
The increasing excavation and utilization of rare earth elements (REEs) have resulted in an elevated release of these elements into the environment. Therefore, investigating the transport behavior of REEs is critical for a comprehensive understanding of their geochemical cycles and to propose potential pollution control strategies. This study investigated the transport, co-transport, and competitive retention of three REEs: La (a light REE), Gd (a middle REE), and Yb (a heavy REE), as well as the co-transport of REEs and kaolinite (a representative clay mineral) in porous media. Both observed and simulated breakthrough curves and retention profiles demonstrated that all ionic REEs exhibited considerable breakthrough and slight retention with almost uniform shapes in quartz sand (QS) owing to the weak affinity of ionic REEs to QS. The breakthrough of REEs in all experiments followed the order of La > Gd > Yb, indicating that REE breakthrough increased with decreasing atomic number. The same elements exhibited their highest breakthrough during the co-transport of the three REEs, followed by co-transport of two REEs, and finally single transport. Furthermore, mathematical modeling indicated that the retention of REEs in QS was a predominantly kinetic process, whereby competitive blocking was the dominant mechanism for the enhanced breakthrough of REEs during co-transport, as compared to single transport. The co-transport of REEs and kaolinite demonstrated that kaolinite has a slight influence on the transport of REEs in QS under adsorption kinetics. However, REEs inhibited the transport and strongly enhanced the retention of kaolinite in QS due to a decreasing electrostatic repulsion between kaolinite and QS in the presence of REEs, even if the adsorption of REEs onto kaolinite was weak under adsorption kinetics. Therefore, this study increases our understanding of the transport mechanisms of REEs in the environment.
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Affiliation(s)
- Yujie Wang
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
| | - Quan Wan
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
| | - Beibei Liu
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
| | - Zikai Wei
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
| | - Miaoyue Zhang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
| | - Yetao Tang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
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10
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Kosmulski M. The pH dependent surface charging and points of zero charge. VIII. Update. Adv Colloid Interface Sci 2020; 275:102064. [PMID: 31757389 DOI: 10.1016/j.cis.2019.102064] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2019] [Revised: 11/05/2019] [Accepted: 11/06/2019] [Indexed: 12/28/2022]
Abstract
A critical review of the points of zero charge (PZC) obtained by potentiometric titration and of isoelectric points (IEP) obtained by electrokinetic measurements. The results from the recent literature are presented with experimental details (temperature, method, type of apparatus, etc.), and they are compared with the zero points of similar materials reported in older publications. Most studies of PZC and IEP reported in the recent papers were carried out for metal oxides and hydroxides, especially alumina, iron oxides, and titania, and the results are consistent with the PZC and IEP of similar materials reported in older literature, and summarized in previous reviews by the same author. Relatively few studies were carried out with less common materials, and IEP of (nominally) VO2 and BN have been reported for the 1st time.
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11
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Amanam UU, Zeng H, Kovscek AR. Nanoparticle delivery to porous media via emulsions and thermally induced phase inversion. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.123614] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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12
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He J, Wang D, Zhang W, Zhou D. Deposition and release of carboxylated graphene in saturated porous media: Effect of transient solution chemistry. CHEMOSPHERE 2019; 235:643-650. [PMID: 31276877 DOI: 10.1016/j.chemosphere.2019.06.187] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 06/21/2019] [Accepted: 06/24/2019] [Indexed: 06/09/2023]
Abstract
Chemical perturbation of pore-water in porous media may remobilize and release deposited colloids/nanomaterials into bulk flow. This re-entrainment process is important to accurately assessing the fate and transport of colloids/nanomaterials in the subsurface. This study investigated deposition and subsequent release of carboxylated graphene nanomaterials (CG) in water-saturated sand columns by first depositing CG at 100 mM NaCl or 2 mM CaCl2 (Phase 1), followed by Phase 2 (elution with sequences of 50, 10, and 1 mM NaCl, or sequences of 0.5 and 0.1 mM CaCl2), and then Phase 3 elution using deionized water. Approximate 89.2%-98.7% of injected CG was retained in sand through Derjaguin-Landau-Verwey-Overbeek (DLVO) interactions, Ca2+ bridging, and straining in Phase 1. Sequential reduction of ionic strength in Phases 2 and 3 resulted in increased release of deposited CG mainly due to the expansion of the electrical double layer thickness and thus decreased depth of the attractive secondary minimum. With increasing pulses of flushing solution, unrecoverable CG increased because weakly associated CG via the secondary minimum was likely translated to immobile regions. Significant tailing of CG released in Phase 3 suggests that CG retained in CaCl2 was more resistant upon detachment than in NaCl. In cation exchange experiment, only 0.7% of applied CG was released, possibly ascribed to the CG remobilized by cation exchange was immediately re-entrained by the secondary minimum in 50 mM NaCl. Our findings indicate that retained nanomaterials (e.g., CG) can be remobilized and transported downward in transient solution chemistries, raising concerns about their potential migration risk to groundwater.
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Affiliation(s)
- Jianzhou He
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI, 48824, United States
| | - Dengjun Wang
- National Research Council Resident Research Associate at the U.S. Environmental Protection Agency, Ada, OK, 74820, United States.
| | - Wei Zhang
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI, 48824, United States
| | - Dongmei Zhou
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China.
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13
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Li M, He L, Zhang M, Liu X, Tong M, Kim H. Cotransport and Deposition of Iron Oxides with Different-Sized Plastic Particles in Saturated Quartz Sand. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:3547-3557. [PMID: 30859829 DOI: 10.1021/acs.est.8b06904] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The present study was designed to investigate the cotransport and deposition of different-sized plastic particle from nano- (0.02 μm) to micrometer-scale (0.2 and 2 μm) with goethite and hematite (two types of representative iron oxides abundant in natural environment) in porous media at both low (5 mM) and high ionic strength (25 mM) in NaCl solutions. We found that through different mechanisms (i.e., modification of surface properties of iron oxides, steric repulsion, or alteration in deposition sites on quartz sand), different-sized plastic particles induced different effects on the transport and deposition behaviors of iron oxides in quartz sand. Likewise, via different mechanisms such as change of surface properties or alteration in deposition sites on quartz sand, different transport behaviors for different sized plastic particles induced by the copresence of iron oxides were also observed. The results of this study suggested that cotransport of iron oxides and plastic particles in porous media is far more complex than those of individual colloid transport. Since both plastic particles and iron oxides are ubiquitous presence in natural environment, it is expected that they would interact with each other and thus alter the surface properties, leading to the change of transport behaviors in porous media.
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Affiliation(s)
- Meng Li
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education; College of Environmental Sciences and Engineering , Peking University , Beijing , 100871 , PR China
| | - Lei He
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education; College of Environmental Sciences and Engineering , Peking University , Beijing , 100871 , PR China
| | - Mengya Zhang
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education; College of Environmental Sciences and Engineering , Peking University , Beijing , 100871 , PR China
| | - Xianwei Liu
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education; College of Environmental Sciences and Engineering , Peking University , Beijing , 100871 , PR China
| | - Meiping Tong
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education; College of Environmental Sciences and Engineering , Peking University , Beijing , 100871 , PR China
| | - Hyunjung Kim
- Department of Mineral Resources and Energy Engineering , Chonbuk National University , Baekje-daero, Deokjin-gu, Jeonju-si , Jeollabuk-do 561-756 , Republic of Korea
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14
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Jahan S, Alias YB, Bakar AFBA, Yusoff IB. Transport and retention behavior of carbonaceous colloids in natural aqueous medium: Impact of water chemistry. CHEMOSPHERE 2019; 217:213-222. [PMID: 30415119 DOI: 10.1016/j.chemosphere.2018.11.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Revised: 10/21/2018] [Accepted: 11/02/2018] [Indexed: 06/09/2023]
Abstract
Carbon based materials are emerging as a sustainable alternative to their metal-oxide counterparts. However, their transport behavior under natural aqueous environment is poorly understood. This study investigated the transport and retention profiles of carbon nanoparticles (CNPs) and graphene oxide quantum dots (GOQDs) through column experiments in saturated porous media. CNPs and GOQDs (30 mg/L) were dispersed in natural river water (RW) and passed through the column at a flow rate of 1 mL/min, which mimicking the natural water flow rate. After every 10 min, the column effluents were collected and the mass recovery and retention profiles were monitored. Results indicated that the transport of both carbonaceous colloids was predominantly controlled by surface potential and ionic composition of natural water. The CNPs with its high surface potential (-40 mV) exhibited more column transport and was less susceptible to solution pH (5.6-6.8) variation as compared to GOQDs (-24 mV). The results showed that, monovalent salt (NaCl) was one of the dominating factors for the retention and transport of carbonaceous colloids compared to divalent salt (CaCl2). Furthermore, the presence of natural organic matter (NOM) increased the transport of both carbonaceous colloids and thereby decreases the tendency for column retention.
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Affiliation(s)
- Shanaz Jahan
- Department of Geology, Faculty of Science, University of Malaya, Kuala Lumpur, 50603, Malaysia.
| | - Yatimah Binti Alias
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, 50603, Malaysia; University of Malaya Centre for Ionic Liquids (UMCiL), University of Malaya, Kuala Lumpur, 50603, Malaysia
| | | | - Ismail Bin Yusoff
- Department of Geology, Faculty of Science, University of Malaya, Kuala Lumpur, 50603, Malaysia
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15
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Ma C, Huangfu X, He Q, Ma J, Huang R. Deposition of engineered nanoparticles (ENPs) on surfaces in aquatic systems: a review of interaction forces, experimental approaches, and influencing factors. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:33056-33081. [PMID: 30267342 DOI: 10.1007/s11356-018-3225-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 09/13/2018] [Indexed: 06/08/2023]
Abstract
The growing development of nanotechnology has promoted the wide application of engineered nanomaterials, raising immense concern over the toxicological impacts of nanoparticles on the ecological environment during their transport processes. Nanoparticles in aquatic systems may undergo deposition onto environmental surfaces, which affects the corresponding interactions of engineered nanoparticles (ENPs) with other contaminants and their environmental fate to a certain extent. In this review, the most common ENPs, i.e., carbonaceous, metallic, and nonmetallic nanoparticles, and their potential ecotoxicological impacts on the environment are summarized. Colloidal interactions, including Derjaguin-Landau-Verwey-Overbeek (DLVO) and non-DLVO forces, involved in governing the depositional behavior of these nanoparticles in aquatic systems are outlined in this work. Moreover, laboratory approaches for examining the deposition of ENPs on collector surfaces, such as the packed-bed column and quartz crystal microbalance (QCM) method, and the limitations of their applications are outlined. In addition, the deposition kinetics of nanoparticles on different types of surfaces are critically discussed as well, with emphasis on other influencing factors, including particle-specific properties, particle aggregation, ionic strength, pH, and natural organic matter. Finally, the future outlook and challenges of estimating the environmental transport of ENPs are presented. This review will be helpful for better understanding the effects and transport fate of ENPs in aquatic systems. Graphical abstract ᅟ.
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Affiliation(s)
- Chengxue Ma
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing, 400044, China
| | - Xiaoliu Huangfu
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing, 400044, China.
| | - Qiang He
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing, 400044, China.
| | - Jun Ma
- State Key Laboratory of Urban Water Resource and Environment, School of Environmental Engineering, Harbin Institute of Technology, Harbin, China
| | - Ruixing Huang
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing, 400044, China
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16
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Cui X, Chen C, Sun S, Zhou D, Ndayisenga F, Huo M, Zhu S, Zhang L, Crittenden JC. Acceleration of saturated porous media clogging and silicon dissolution due to low concentrations of Al(III) in the recharge of reclaimed water. WATER RESEARCH 2018; 143:136-145. [PMID: 29945029 DOI: 10.1016/j.watres.2018.06.043] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 05/10/2018] [Accepted: 06/18/2018] [Indexed: 06/08/2023]
Abstract
The recharge of reclaimed water is an effective strategy for addressing the issues of water quality deterioration and groundwater level decline simultaneously. Residual Al coagulants are normally remained in the recovered water at low concentrations, and may induce clogging problems during the recharging process. However, this issue has been ignored in the past. In this study, we investigated the mechanisms of Al(III)-induced aquifer bio-clogging, the role of Al(III) in quartz sand media (SiO2) dissolution and re-precipitation in the series of aquifer columns. We determined that Al(III) resulted in serious clogging in ∼140 h at low concentrations that satisfied the national drinking water standard of China. The corresponding hydraulic conductivity decreased by more than ∼90% in the bacteria-containing aquifer, which was ∼30% greater than that for the bacteria-free trials. The enhanced Al(III)-related clogging was caused by modifying quartz sand to form Si-O-Al(OH)n and improving microbes attachment. Microbes retention kinetic coefficients (k) of the Al recharged simulated aquifer could increase by 3.0-8.3 times. The Al(III) also enhanced biomass production and clogging by binding to microbial extracellular polymeric substances. In turn, the greater amount of biomass accelerated the Si dissolution and re-precipitation, this may potentially damage the stability of aquifer structure. The results showed that reclaimed water treated with Al coagulation should be employed with caution for recharging.
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Affiliation(s)
- Xiaochun Cui
- School of Environment, Northeast Normal University, Changchun 130117, China; Jilin Engineering Lab for Water Pollution Control and Resources Recovery, Northeast Normal University, Changchun 130117, China
| | - Congli Chen
- School of Environment, Northeast Normal University, Changchun 130117, China
| | - Shu Sun
- School of Environment, Northeast Normal University, Changchun 130117, China
| | - Dandan Zhou
- School of Environment, Northeast Normal University, Changchun 130117, China; Jilin Engineering Lab for Water Pollution Control and Resources Recovery, Northeast Normal University, Changchun 130117, China.
| | - Fabrice Ndayisenga
- School of Environment, Northeast Normal University, Changchun 130117, China
| | - Mingxin Huo
- School of Environment, Northeast Normal University, Changchun 130117, China
| | - Suiyi Zhu
- School of Environment, Northeast Normal University, Changchun 130117, China; Jilin Engineering Lab for Water Pollution Control and Resources Recovery, Northeast Normal University, Changchun 130117, China.
| | - Leilei Zhang
- School of Environment, Northeast Normal University, Changchun 130117, China
| | - John C Crittenden
- Brook Byers Institute for Sustainable Systems, Georgia Institute of Technology, Atlanta, GA 30332, USA; School of Civil & Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
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17
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Van Koetsem F, Woldetsadik GS, Folens K, Rinklebe J, Du Laing G. Partitioning of Ag and CeO 2 nanoparticles versus Ag and Ce ions in soil suspensions and effect of natural organic matter on CeO 2 nanoparticles stability. CHEMOSPHERE 2018; 200:471-480. [PMID: 29501884 DOI: 10.1016/j.chemosphere.2018.02.133] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 02/01/2018] [Accepted: 02/21/2018] [Indexed: 06/08/2023]
Abstract
This study examined the solid-liquid distribution of 14.8-nm Ag and 6.2-nm CeO2 nanoparticles in soil suspensions and compared it to that of Ag+ and Ce3+ ions, to better understand their environmental behaviour and fate. After 24 h incubation, more than 51% or 29% of the spiked amounts of Ag or CeO2 nanoparticles, respectively, can be retrieved in the liquid phase of (re)suspended soils. The Ag or Ce concentration remaining in solution depends on the incubation time and was influenced by soil properties. Significant correlations are obtained between, on the one hand, the relative amounts of Ag or CeO2 nanoparticles in suspension and the soil-pH, CEC, texture, suspended matter, nitrogen, phosphorus, TOC and main and trace elements content on the other hand. The presence of dissolved natural organic matter stabilizes CeO2 nanoparticles in the aqueous phase. In soil suspensions, Ag+ and Ce3+ ions seemingly interact more strongly with soil constituents compared to their nanoparticle counterparts, rendering the Ag and CeO2 nanoparticles to be more stable and potentially bioavailable.
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Affiliation(s)
- Frederik Van Koetsem
- Laboratory of Analytical Chemistry and Applied Ecochemistry, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, Ghent, Belgium
| | - Gebeyehu Sebsibie Woldetsadik
- Laboratory of Analytical Chemistry and Applied Ecochemistry, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, Ghent, Belgium
| | - Karel Folens
- Laboratory of Analytical Chemistry and Applied Ecochemistry, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, Ghent, Belgium
| | - Jörg Rinklebe
- Soil- and Groundwater-Management, Institute for Soil Engineering, Water and Wastewater Management, University of Wuppertal, Pauluskirchstraße 7, Wuppertal, Germany; Department of Environment and Energy, Sejong University, Seoul 05006, Republic of Korea
| | - Gijs Du Laing
- Laboratory of Analytical Chemistry and Applied Ecochemistry, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, Ghent, Belgium. http://www.ecochem.ugent.be
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18
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Shevlin D, O'Brien N, Cummins E. Silver engineered nanoparticles in freshwater systems - Likely fate and behaviour through natural attenuation processes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 621:1033-1046. [PMID: 29079093 DOI: 10.1016/j.scitotenv.2017.10.123] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Revised: 10/12/2017] [Accepted: 10/13/2017] [Indexed: 06/07/2023]
Abstract
Growth in the nanotechnology sector is likely introducing unnatural formations of materials on the nanoscale (10-9m) to the environment. Disposal and degradation of products incorporating engineered nanomaterials (ENMs) are likely being released into natural aquatic systems un-intentionally primarily via waste water effluents. The fate and behaviour of metallic based nanoparticles (NPs) such as silver (Ag) in aquatic waters is complex with high levels of variability and uncertainty. In-situ physical, biological and chemical (natural attenuation) processes are likely to influence ENM fate and behaviour in freshwater systems. Surfaced functionalized particles may inhibit or limit environmental transformations which influence particle aggregation, mobility, dissolution and eco-toxic potential. This paper focuses on ENM characteristics and the influence of physical, chemical and biological processes occurring in aquatic systems that are likely to impact metallic ENMs fate. A focus on silver NPs (while for comparison, reporting about other metallic ENMs as appropriate) released to aquatic systems is discussed relating to their likely fate and behaviour in this dynamic and complex environment. This paper further highlights the need for specific risk assessment approaches for metallic ENMs and puts this into context with regard to informing environmental policy and potential NP influence on environmental/human health.
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Affiliation(s)
- David Shevlin
- School of Biosystems and Food Engineering, University College Dublin, Belfield, Dublin 4, Ireland.
| | - Niall O'Brien
- School of Biosystems and Food Engineering, University College Dublin, Belfield, Dublin 4, Ireland.
| | - Enda Cummins
- School of Biosystems and Food Engineering, University College Dublin, Belfield, Dublin 4, Ireland.
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19
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Li Z, Sahle-Demessie E, Aly Hassan A, Pressman JG, Sorial GA, Han C. Effects of source and seasonal variations of natural organic matters on the fate and transport of CeO 2 nanoparticles in the environment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 609:1616-1626. [PMID: 28810513 PMCID: PMC6702457 DOI: 10.1016/j.scitotenv.2017.07.154] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 07/17/2017] [Accepted: 07/17/2017] [Indexed: 05/17/2023]
Abstract
Natural organic matter (NOM) affects the stability and transport of nanoparticles (NPs) in natural waters by modifying their physiochemical properties. Source location, and seasonal variations, influence their molecular, physical and electrical charge properties. To understand the variations of NOM on the mobilization of NPs, large volumes of water were collected from the Ohio River (OR) over winter and summer seasons and dissolved NOMs were concentrated. The chemical and structural differences of these NOMs were compared with the Suwannee River humic acid (SRHA) SRHA using 1H and 13C nuclear magnetic resonance spectroscopy, and Fourier transforms infrared (FTIR) spectroscopy. Thermal analysis and FTIR confirmed that differences in composition, structure, and functional groups are a result of SRHA fractionation compared to whole molecule OR-NOM. The influence of OR-NOMs on the surface charge of CeO2 NPs and the effects on the transport and retention in a three-phase (deposition-rinse-re-entrainment) sand-packed columns were investigated at CeO2 NPs initial concertation of 10ppm, pH6.8, increasing ionic strength (3, 5, and 10mM), retention time of 1min, and increasing NOM concentration (1, 5, and 10ppm). The summer OR-NOM showed higher stabilization and mobilization effect on the CeO2 than the winter NOM; while their effect was very different form the SRHA. The stabilization of NPs is attributed to both electrostatic and steric effects. The differences in the chemical structure of the complex and heterogeneous NOMs showed disparate reactivity and direct impact on CeO2-NPs stability. Using SRHA to study the effect of NOM for drinking water related assessment does not sufficiently represent the natural conditions of the environment.
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Affiliation(s)
- Zhen Li
- Environmental Engineering Program, Department of Biomedical, Chemical, and Environmental Engineering, University of Cincinnati, P.O. Box 210012, Cincinnati, OH 45221-0012, United States
| | - Endalkachew Sahle-Demessie
- U.S. Environmental Protection Agency, Office of Research and Development, NRMRL, 26 W. Martin Luther King Drive (MS 443), Cincinnati, OH 45268, United States.
| | - Ashraf Aly Hassan
- Department of Civil Engineering, University of Nebraska Lincoln, P.O. Box 886105, Lincoln, NE 68588-6105, United States
| | - Jonathan G Pressman
- U.S. Environmental Protection Agency, Office of Research and Development, NRMRL, 26 W. Martin Luther King Drive (MS 443), Cincinnati, OH 45268, United States
| | - George A Sorial
- Environmental Engineering Program, Department of Biomedical, Chemical, and Environmental Engineering, University of Cincinnati, P.O. Box 210012, Cincinnati, OH 45221-0012, United States
| | - Changseok Han
- U.S. Environmental Protection Agency, Office of Research and Development, NRMRL, 26 W. Martin Luther King Drive (MS 443), Cincinnati, OH 45268, United States
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20
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Liu C, Xu N, Feng G, Zhou D, Cheng X, Li Z. Hydrochars and phosphate enhancing the transport of nanoparticle silica in saturated sands. CHEMOSPHERE 2017; 189:213-223. [PMID: 28942247 DOI: 10.1016/j.chemosphere.2017.09.066] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 09/12/2017] [Accepted: 09/15/2017] [Indexed: 06/07/2023]
Abstract
Due to the potential negative impact of nano silica (nSiO2) on human's health and living environments, it is important to investigate their transport in soil environments. Hydrochars has been widely used in agricultural soil and phosphate (P) is an important nutrient, thus the aggregation and transport of nSiO2 in saturated sand columns were investigated in single and binary systems of hydrochars and P. The experimental results showed that the nSiO2 aggregates can be restablized by the adsorption of P or the attachment of hydrochars at high IS (>100 mM) and low pH (<7.0). Accordingly, the transport of nSiO2 in sand columns is enhanced due to the smaller particle size. However, the nSiO2 presents the distinct surface characteristics at pH > 7.0 from that at pH < 7.0. Thus, nSiO2 has a better dispersivity in 300 mM NaCl solution at high pH (9.0). Nevertheless, their deposition to sands becomes pronounced in the presence of hydrochars and/or P. In particular, the formation of nSiO2-hydrochar-Phosphate clusters associated with the larger size mainly contributes to the enhancement of nSiO2 retention in sand columns during the wide pH range, when hydrochars and P coexist in suspensions. The two-site dynamic model fitting results showed that the reversible retention is related to k2 (First-order straining coefficient on site 2). The results in this study will provide the theoretical basis for assessing the retention of nSiO2 in soil environment with the presence of hydrochars and phosphate.
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Affiliation(s)
- Cheng Liu
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Nan Xu
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
| | - Gang Feng
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Dongmei Zhou
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Xueying Cheng
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Zuling Li
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
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21
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Babakhani P, Bridge J, Doong RA, Phenrat T. Continuum-based models and concepts for the transport of nanoparticles in saturated porous media: A state-of-the-science review. Adv Colloid Interface Sci 2017. [PMID: 28641812 DOI: 10.1016/j.cis.2017.06.002] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Environmental applications of nanoparticles (NP) increasingly result in widespread NP distribution within porous media where they are subject to various concurrent transport mechanisms including irreversible deposition, attachment/detachment (equilibrium or kinetic), agglomeration, physical straining, site-blocking, ripening, and size exclusion. Fundamental research in NP transport is typically conducted at small scale, and theoretical mechanistic modeling of particle transport in porous media faces challenges when considering the simultaneous effects of transport mechanisms. Continuum modeling approaches, in contrast, are scalable across various scales ranging from column experiments to aquifer. They have also been able to successfully describe the simultaneous occurrence of various transport mechanisms of NP in porous media such as blocking/straining or agglomeration/deposition/detachment. However, the diversity of model equations developed by different authors and the lack of effective approaches for their validation present obstacles to the successful robust application of these models for describing or predicting NP transport phenomena. This review aims to describe consistently all the important NP transport mechanisms along with their representative mathematical continuum models as found in the current scientific literature. Detailed characterizations of each transport phenomenon in regards to their manifestation in the column experiment outcomes, i.e., breakthrough curve (BTC) and residual concentration profile (RCP), are presented to facilitate future interpretations of BTCs and RCPs. The review highlights two NP transport mechanisms, agglomeration and size exclusion, which are potentially of great importance in controlling the fate and transport of NP in the subsurface media yet have been widely neglected in many existing modeling studies. A critical limitation of the continuum modeling approach is the number of parameters used upon application to larger scales and when a series of transport mechanisms are involved. We investigate the use of simplifying assumptions, such as the equilibrium assumption, in modeling the attachment/detachment mechanisms within a continuum modelling framework. While acknowledging criticisms about the use of this assumption for NP deposition on a mechanistic (process) basis, we found that its use as a description of dynamic deposition behavior in a continuum model yields broadly similar results to those arising from a kinetic model. Furthermore, we show that in two dimensional (2-D) continuum models the modeling efficiency based on the Akaike information criterion (AIC) is enhanced for equilibrium vs kinetic with no significant reduction in model performance. This is because fewer parameters are needed for the equilibrium model compared to the kinetic model. Two major transport regimes are identified in the transport of NP within porous media. The first regime is characterized by higher particle-surface attachment affinity than particle-particle attachment affinity, and operative transport mechanisms of physicochemical filtration, blocking, and physical retention. The second regime is characterized by the domination of particle-particle attachment tendency over particle-surface affinity. In this regime although physicochemical filtration as well as straining may still be operative, ripening is predominant together with agglomeration and further subsequent retention. In both regimes careful assessment of NP fate and transport is necessary since certain combinations of concurrent transport phenomena leading to large migration distances are possible in either case.
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22
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Garner KL, Suh S, Keller AA. Assessing the Risk of Engineered Nanomaterials in the Environment: Development and Application of the nanoFate Model. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:5541-5551. [PMID: 28443660 DOI: 10.1021/acs.est.6b05279] [Citation(s) in RCA: 117] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
We developed a dynamic multimedia fate and transport model (nanoFate) to predict the time-dependent accumulation of metallic engineered nanomaterials (ENMs) across environmental media. nanoFate considers a wider range of processes and environmental subcompartments than most previous models and considers ENM releases to compartments (e.g., urban, agriculture) in a manner that reflects their different patterns of use and disposal. As an example, we simulated ten years of release of nano CeO2, CuO, TiO2, and ZnO in the San Francisco Bay area. Results show that even soluble metal oxide ENMs may accumulate as nanoparticles in the environment in sufficient concentrations to exceed the minimum toxic threshold in freshwater and some soils, though this is more likely with high-production ENMs such as TiO2 and ZnO. Fluctuations in weather and release scenario may lead to circumstances where predicted ENM concentrations approach acute toxic concentrations. The fate of these ENMs is to mostly remain either aggregated or dissolved in agricultural lands receiving biosolids and in freshwater or marine sediments. Comparison to previous studies indicates the importance of some key model aspects including climatic and temporal variations, how ENMs may be released into the environment, and the effect of compartment composition on predicted concentrations.
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Affiliation(s)
- Kendra L Garner
- Bren School of Environmental Science & Management, University of California , SantaBarbara, California 93106, United States
| | - Sangwon Suh
- Bren School of Environmental Science & Management, University of California , SantaBarbara, California 93106, United States
| | - Arturo A Keller
- Bren School of Environmental Science & Management, University of California , SantaBarbara, California 93106, United States
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23
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Bai X, Liu F, Liu Y, Li C, Wang S, Zhou H, Wang W, Zhu H, Winkler DA, Yan B. Toward a systematic exploration of nano-bio interactions. Toxicol Appl Pharmacol 2017; 323:66-73. [PMID: 28344110 PMCID: PMC5581002 DOI: 10.1016/j.taap.2017.03.011] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 02/08/2017] [Accepted: 03/11/2017] [Indexed: 12/19/2022]
Abstract
Many studies of nanomaterials make non-systematic alterations of nanoparticle physicochemical properties. Given the immense size of the property space for nanomaterials, such approaches are not very useful in elucidating fundamental relationships between inherent physicochemical properties of these materials and their interactions with, and effects on, biological systems. Data driven artificial intelligence methods such as machine learning algorithms have proven highly effective in generating models with good predictivity and some degree of interpretability. They can provide a viable method of reducing or eliminating animal testing. However, careful experimental design with the modelling of the results in mind is a proven and efficient way of exploring large materials spaces. This approach, coupled with high speed automated experimental synthesis and characterization technologies now appearing, is the fastest route to developing models that regulatory bodies may find useful. We advocate greatly increased focus on systematic modification of physicochemical properties of nanoparticles combined with comprehensive biological evaluation and computational analysis. This is essential to obtain better mechanistic understanding of nano-bio interactions, and to derive quantitatively predictive and robust models for the properties of nanomaterials that have useful domains of applicability.
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Affiliation(s)
- Xue Bai
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, China
| | - Fang Liu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, China
| | - Yin Liu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, China
| | - Cong Li
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, China
| | - Shenqing Wang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, China
| | - Hongyu Zhou
- School of Environmental Science and Technology, Shandong University, Jinan, China
| | - Wenyi Wang
- Department of Chemistry, Rutgers University, Camden, NJ, United States; The Rutgers Center for Computational and Integrative Biology, Rutgers University, Camden, NJ, United States
| | - Hao Zhu
- Department of Chemistry, Rutgers University, Camden, NJ, United States; The Rutgers Center for Computational and Integrative Biology, Rutgers University, Camden, NJ, United States
| | - David A Winkler
- CSIRO Manufacturing, Bag 10, Clayton South MDC 3169, Australia; Monash Institute of Pharmaceutical Sciences, 392 Royal Parade, Parkville 3052, Australia; La Trobe Institute for Molecular Science, La Trobe University, Kingsbury Drive, Melbourne 3086, Australia; School of Chemical and Physical Sciences, Flinders University, Bedford Park 5042, Australia.
| | - Bing Yan
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, China; School of Environmental Science and Technology, Shandong University, Jinan, China.
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Markus AA, Parsons JR, Roex EWM, de Voogt P, Laane RWPM. Modelling the Release, Transport and Fate of Engineered Nanoparticles in the Aquatic Environment - A Review. REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2017; 243:53-87. [PMID: 28028609 DOI: 10.1007/398_2016_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Engineered nanoparticles, that is, particles of up to 100 nm in at least one dimension, are used in many consumer products. Their release into the environment as a consequence of their production and use has raised concern about the possible consequences. While they are made of ordinary substances, their size gives them properties that are not manifest in larger particles. It is precisely these properties that make them useful. For instance titanium dioxide nanoparticles are used in transparent sunscreens, because they are large enough to scatter ultraviolet light but too small to scatter visible light.To investigate the occurrence of nanoparticles in the environment we require practical methods to detect their presence and to measure the concentrations as well as adequate modelling techniques. Modelling provides both a complement to the available detection and measurement methods and the means to understand and predict the release, transport and fate of nanoparticles. Many different modelling approaches have been developed, but it is not always clear for what questions regarding nanoparticles in the environment these approaches can be applied. No modelling technique can be used for every possible aspect of the release of nanoparticles into the environment. Hence it is important to understand which technique to apply in what situation. This article provides an overview of the techniques involved with their strengths and weaknesses. Two points need to be stressed here: the modelling of processes like dissolution and the surface activity of nanoparticles, possibly under influence of ultraviolet light, or chemical transformation has so far received relatively little attention. But also the uncertainties surrounding nanoparticles in general-the amount of nanoparticles used in consumer products, what constitutes the appropriate measure of concentration (mass or numbers) and what processes are relevant-should be explicitly considered as part of the modelling.
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Affiliation(s)
- Adriaan A Markus
- Deltares, 177, Delft, 2600 MH, The Netherlands.
- Earth Surface Science, IBED, University of Amsterdam, Science Park 904, Amsterdam, 1098 XH, The Netherlands.
| | - John R Parsons
- Earth Surface Science, IBED, University of Amsterdam, Science Park 904, Amsterdam, 1098 XH, The Netherlands
| | | | - Pim de Voogt
- Aquatic Environmental Ecology, IBED, University of Amsterdam, Science Park 904, Amsterdam, 1098 XH, The Netherlands
- KWR Watercycle Research Institute, Nieuwegein, The Netherlands
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Tassi E, Giorgetti L, Morelli E, Peralta-Videa JR, Gardea-Torresdey JL, Barbafieri M. Physiological and biochemical responses of sunflower (Helianthus annuus L.) exposed to nano-CeO 2 and excess boron: Modulation of boron phytotoxicity. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2017; 110:50-58. [PMID: 27665987 DOI: 10.1016/j.plaphy.2016.09.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 09/17/2016] [Accepted: 09/17/2016] [Indexed: 06/06/2023]
Abstract
Little is known about the interaction of nanoparticles (NPs) with soil constituents and their effects in plants. Boron (B), an essential micronutrient that reduces crop production at both deficiency and excess, has not been investigated with respect to its interaction with cerium oxide NPs (nano-CeO2). Considering conflicting results on the nano-CeO2 toxicity and protective role as antioxidant, their possible modulation on B toxicity in sunflower (Helianthus annuus L.) was investigated. Sunflower was cultivated for 30 days in garden pots containing original or B-spiked soil amended with nano-CeO2 at 0-800 mg kg-1. At harvest, Ce and B concentrations in tissues, biomass, and activities of stress enzymes in leaves were determined. Results showed that in the original soil, Ce accumulated mainly in roots, with little translocation to stems and leaves, while reduced root Ce was observed in plants from B-spiked soil. In the original soil, higher levels of nano-CeO2 reduced plant B concentration. Although morphological effects were not visible, changes in biomass and oxidative stress response were observed. Sunflower leaves from B-spiked soil showed visible symptoms of B toxicity, such as necrosis and chlorosis in old leaves, as well as an increase of superoxide dismutase (SOD) activity. However, at high nano-CeO2 level, SOD activity decreased reaching values similar to that of the control. This study has shown that nano-CeO2 reduced both the B nutritional status of sunflower in original soil and the B phytotoxicity in B-spiked soil.
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Affiliation(s)
- E Tassi
- Institute of Ecosystem Studies, National Research Council (ISE-CNR), Via Moruzzi, 1 - 56124, Pisa, Italy.
| | - L Giorgetti
- Institute of Agricultural Biology and Biotechnology, National Research Council (IBBA-CNR), Via Moruzzi, 1 - 56124, Pisa, Italy
| | - E Morelli
- Biophysics Institute, National Research Council (IBF-CNR), Via Moruzzi, 1 - 56124, Pisa, Italy
| | - J R Peralta-Videa
- Chemistry Department, The University of Texas at El Paso, 500 West Univ. Av., El Paso, TX 79968, United States; Environmental Science and Engineering PhD Program, The University of Texas at El Paso, 500 W. University Ave., El Paso, TX 79968, United States; Center for Environmental Implications of Nanotechnology, The University of Texas at El Paso, 500 W. University Ave., El Paso, TX 79968, United States
| | - J L Gardea-Torresdey
- Chemistry Department, The University of Texas at El Paso, 500 West Univ. Av., El Paso, TX 79968, United States; Environmental Science and Engineering PhD Program, The University of Texas at El Paso, 500 W. University Ave., El Paso, TX 79968, United States; Center for Environmental Implications of Nanotechnology, The University of Texas at El Paso, 500 W. University Ave., El Paso, TX 79968, United States
| | - M Barbafieri
- Institute of Ecosystem Studies, National Research Council (ISE-CNR), Via Moruzzi, 1 - 56124, Pisa, Italy
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Transport of cerium oxide nanoparticles in saturated silica media: influences of operational parameters and aqueous chemical conditions. Sci Rep 2016; 6:34135. [PMID: 27694968 PMCID: PMC5046158 DOI: 10.1038/srep34135] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Accepted: 09/07/2016] [Indexed: 11/08/2022] Open
Abstract
This paper aimed to investigate the influences of operational parameters and aqueous chemical conditions on transport behaviors of cerium oxides nanoparticles (CeO2-NPs) in saturated silica media. Results indicated that increasing rates of attachment efficiency (α) were related with cationic types, and critical deposition concentration (CDC) for divalent cation (Ca2+ and Mg2+) were more than 31-fold of that for monovalent cation (Na+ and K+). Increase or reduction of electrolyte pH could both promote the mobility of CeO2-NPs in glass beads, while influence was more evident at alkaline conditions. α increased linearly with NPs concentrations, while decreased linearly with flow velocity in the column, and effects were related with electrolyte contents. Presence of surfactants could sharply decreased α, and SDS was more effective to facilitate CeO2-NPs transport than Triton X–100. With DOMs concentrations increasing, α firstly kept constant, then sharply declined, and finally reduced very slowly. The influence of DOMs on NPs deposition was in order of SA > HA > TA > BSA. Overall, this study revealed that aqueous chemical conditions was crucial to NPs transport in porous media, and would provide significant information for our understanding on the fate and transport of nanoparticles in natural environment.
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Afrooz ARMN, Das D, Murphy CJ, Vikesland P, Saleh NB. Co-transport of gold nanospheres with single-walled carbon nanotubes in saturated porous media. WATER RESEARCH 2016; 99:7-15. [PMID: 27130967 DOI: 10.1016/j.watres.2016.04.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Revised: 03/10/2016] [Accepted: 04/04/2016] [Indexed: 06/05/2023]
Abstract
Porous media transport of engineered nanomaterials (ENMs) is typically assessed in a controlled single-particulate environment. Presence of a secondary particle (either natural or engineered) in the natural environment though likely, is rarely taken into consideration in assessing ENMs' transport behavior. This study systematically assesses the effect of a secondary ENM (i.e., pluronic acid modified single-walled carbon nanotubes, PA-SWNTs) on a primary particle (i.e., gold nanospheres, AuNSs) transport through saturated porous media under a wide range of aquatic conditions (1-100 mM NaCl). AuNS hetero-dispersions (i.e., with PA-SWNTs) are transported through saturated sand columns, and the transport behavior is compared to AuNS-only homo-dispersion cases, which display classical ionic strength-dependent behavior. AuNS hetero-dispersion, however, is highly mobile with little to no ionic strength-dependent effects. This study also assesses the role of pre-coating of the collectors with PA-SWNTs on AuNSs' mobility, thereby elucidating the role played by the order of introduction of the secondary particles. Pre-existence of the secondary particles in the porous media shows enhanced filtration of primary AuNSs. However, the presence of natural organic matter (NOM) slightly increases AuNS mobility through PA-SWNT coated sand at 10 mM ionic strength. The study results demonstrate that the presence and order of addition of the secondary particles strongly influence primary particles' mobility. Thus ENMs can demonstrate facilitated transport or enhanced removal, depending on the presence of the secondary particulate matter and background solution chemistry.
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Affiliation(s)
- A R M Nabiul Afrooz
- Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, TX 78712, United States
| | - Dipesh Das
- Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, TX 78712, United States
| | - Catherine J Murphy
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States
| | - Peter Vikesland
- Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, United States
| | - Navid B Saleh
- Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, TX 78712, United States.
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Pham NH, Harwell JH, Resasco DE, Papavassiliou DV, Chen C, Shiau B. Transport and deposition kinetics of polymer-coated multiwalled carbon nanotubes in packed beds. AIChE J 2016. [DOI: 10.1002/aic.15273] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ngoc H. Pham
- School of Chemical, Biological, and Materials Engineering, University of Oklahoma; Norman Oklahoma 73019-1004
| | - Jeffrey H. Harwell
- School of Chemical, Biological, and Materials Engineering, University of Oklahoma; Norman Oklahoma 73019-1004
| | - Daniel E. Resasco
- School of Chemical, Biological, and Materials Engineering, University of Oklahoma; Norman Oklahoma 73019-1004
| | - Dimitrios V. Papavassiliou
- School of Chemical, Biological, and Materials Engineering, University of Oklahoma; Norman Oklahoma 73019-1004
| | - Changlong Chen
- Mewbourne School of Petroleum and Geological Engineering; University of Oklahoma; Norman Oklahoma 73019-1004
| | - Benjamin Shiau
- Mewbourne School of Petroleum and Geological Engineering; University of Oklahoma; Norman Oklahoma 73019-1004
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Zhou DD, Jiang XH, Lu Y, Fan W, Huo MX, Crittenden JC. Cotransport of graphene oxide and Cu(II) through saturated porous media. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 550:717-726. [PMID: 26849335 DOI: 10.1016/j.scitotenv.2016.01.141] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Revised: 01/12/2016] [Accepted: 01/22/2016] [Indexed: 05/21/2023]
Abstract
This study examines the cotransport of graphene oxide (GO) and Cu in porous media. The impacts of GO concentration and ion strength (IS) on Cu transport in laboratory packed columns were investigated. The results indicated that GO had fairly high mobility at a IS of 1mM, and could serve as an effective carrier of Cu(II). The facilitated transport was found to increase with increasing concentration of GO (CGO). The peak effluent concentration (C/C0)max of Cu was 0.57 at CGO of 120mg/L and IS=1mM and 0.13 at 40mg/L and IS=1mM. The Cu appears to be irreversibly adsorbed by the sand because no Cu appeared in the effluent in the absence of GO. However, the GO-facilitated Cu transport was reduced as the IS increased from 1 to 1000mM. In fact, the facilitated transport was zero percent at an IS of 1000mM. Particle size analysis, Zeta potential measurements and DLVO calculations demonstrated that higher IS values made the GO became unstable and it flocculated and attached to the sand. We also fed GO into the column pre-equilibrated by Cu as sequential elution experiments and found that the later introduced GO can complex the pre-adsorbed Cu from the sand surface because GO has a higher adsorption affinity for Cu. An advection-dispersion-retention numerical model was able to describe the Cu and GO transport in the column. Our work provides useful insights into fate, transport and risk assessment of heavy metal contaminants in the presence of engineered nanoparticles.
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Affiliation(s)
- D D Zhou
- School of environment, Northeast Normal University, Changchun 130117, China
| | - X H Jiang
- School of environment, Northeast Normal University, Changchun 130117, China
| | - Y Lu
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China
| | - W Fan
- School of environment, Northeast Normal University, Changchun 130117, China.
| | - M X Huo
- School of environment, Northeast Normal University, Changchun 130117, China
| | - J C Crittenden
- School of environment, Northeast Normal University, Changchun 130117, China; School of Civil & Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States
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Donovan AR, Adams CD, Ma Y, Stephan C, Eichholz T, Shi H. Detection of zinc oxide and cerium dioxide nanoparticles during drinking water treatment by rapid single particle ICP-MS methods. Anal Bioanal Chem 2016; 408:5137-45. [DOI: 10.1007/s00216-016-9432-0] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Revised: 02/13/2016] [Accepted: 02/18/2016] [Indexed: 01/05/2023]
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Cerrillo C, Barandika G, Igartua A, Areitioaurtena O, Mendoza G. Towards the standardization of nanoecotoxicity testing: Natural organic matter 'camouflages' the adverse effects of TiO2 and CeO2 nanoparticles on green microalgae. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 543:95-104. [PMID: 26580731 DOI: 10.1016/j.scitotenv.2015.10.137] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Revised: 10/27/2015] [Accepted: 10/27/2015] [Indexed: 06/05/2023]
Abstract
In the last few years, the emission of CeO2 and TiO2 nanoparticles (NPs) into the environment has been raising concerns about their potential adverse effects on wildlife and human health. Aquatic organisms constitute one of the most important pathways for the entrance of these NPs and transfer throughout the food web, but divergences exist in the experimental data published on their aquatic toxicity. The pressing need for standardization of methods to analyze their ecotoxicity requires aquatic media representing realistic environmental conditions. The present study aimed to determine the usefulness of Suwannee River natural organic matter (SR-NOM) in the assessment of the agglomeration kinetics and ecotoxicity of CeO2 and TiO2 NPs towards green microalgae Pseudokirchneriella subcapitata. SR-NOM alleviated the adverse effects of NPs on algal growth, completely in the case of TiO2 NPs and partially in the case of CeO2 NPs, suggesting a 'camouflage' of toxicity. This behavior has been observed also for other algal species and types of natural organic matter in the literature. Furthermore, SR-NOM markedly increased the stability of the NPs in algal medium, which led to a better reproducibility of the toxicity test results, and provided an electrophoretic mobility similar to that previously reported in various river and groundwaters. Thus, SR-NOM can be a representative sample of what is found in many different ecosystems, and the observed 'camouflage' of the effects of CeO2 and TiO2 NPs on algal cells might be considered as a natural interaction occurring in their standardized ecotoxicological assessment.
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Affiliation(s)
- Cristina Cerrillo
- Department of Inorganic Chemistry, University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain; Tribology Unit, IK4-TEKNIKER, Eibar, Gipuzkoa, Spain.
| | - Gotzone Barandika
- Department of Inorganic Chemistry, University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain
| | - Amaya Igartua
- Tribology Unit, IK4-TEKNIKER, Eibar, Gipuzkoa, Spain
| | | | - Gemma Mendoza
- Tribology Unit, IK4-TEKNIKER, Eibar, Gipuzkoa, Spain
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Fang J, Wang MH, Lin DH, Shen B. Enhanced transport of CeO2 nanoparticles in porous media by macropores. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 543:223-229. [PMID: 26584072 DOI: 10.1016/j.scitotenv.2015.11.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Revised: 10/09/2015] [Accepted: 11/07/2015] [Indexed: 06/05/2023]
Abstract
This is the first study to investigate the effect of macropores on the transport of CeO2 nanoparticles (nCeO2) in quartz sand and soil. The artificial macropore types are the vertical continuous macropore (O-O), and the vertical discontinuous macropore (O-C). The results indicated that the mobility of nCeO2 was significantly enhanced by the macropore in both quartz sand and soil, and the enhancement was greater in the continuous macropore than in the discontinuous macropore. Compared with the homogeneous column, both the O-O and O-C macropores in quartz sand favored an earlier breakthrough and a larger initial effluent recovery rate of nCeO2. However, there was little influence on the plateau concentration and the total effluent recovery rate. In soil, both types of macropores significantly shortened nCeO2 breakthrough time, and favored a higher plateau concentration, and a larger initial and total effluent recovery rate. The O-O macropore which accounted for only 1% of the total pore volume had doubly increased the total mobility of nCeO2 in soil; even the mobility was increased by 30% with the O-C macropore. It was found that the effect of preferential flow on nCeO2 transport was greater in soil than it was in quartz sand.
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Affiliation(s)
- Jing Fang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China.
| | - Min-Hao Wang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China
| | - Dao-Hui Lin
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, PR China
| | - Bing Shen
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China
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Esfandyari Bayat A, Junin R, Derahman MN, Samad AA. TiO₂ nanoparticle transport and retention through saturated limestone porous media under various ionic strength conditions. CHEMOSPHERE 2015; 134:7-15. [PMID: 25889359 DOI: 10.1016/j.chemosphere.2015.03.052] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 03/17/2015] [Accepted: 03/24/2015] [Indexed: 06/04/2023]
Abstract
The impact of ionic strength (from 0.003 to 500mM) and salt type (NaCl vs MgCl2) on transport and retention of titanium dioxide (TiO2) nanoparticles (NPs) in saturated limestone porous media was systematically studied. Vertical columns were packed with limestone grains. The NPs were introduced as a pulse suspended in aqueous solutions and breakthrough curves in the column outlet were generated using an ultraviolent-visible spectrometry. Presence of NaCl and MgCl2 in the suspensions were found to have a significant influence on the electrokinetic properties of the NP aggregates and limestone grains. In NaCl and MgCl2 solutions, the deposition rates of the TiO2-NP aggregates were enhanced with the increase in ionic strength, a trend consistent with traditional Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Furthermore, the NP aggregates retention increased in the porous media with ionic strength. The presence of salts also caused a considerable delay in the NPs breakthrough time. MgCl2 as compared to NaCl was found to be more effective agent for the deposition and retention of TiO2-NPs. The experimental results followed closely the general trends predicted by the filtration and DLVO calculations. Overall, it was found that TiO2-NP mobility in the limestone porous media depends on ionic strength and salt type.
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Affiliation(s)
- Ali Esfandyari Bayat
- Department of Petroleum Engineering, Faculty of Petroleum and Renewable Energy Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor Bahru, Malaysia.
| | - Radzuan Junin
- Department of Petroleum Engineering, Faculty of Petroleum and Renewable Energy Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor Bahru, Malaysia
| | - Mohd Nawi Derahman
- Department of Petroleum Engineering, Faculty of Petroleum and Renewable Energy Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor Bahru, Malaysia
| | - Adlina Abdul Samad
- Language Academy, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor Bahru, Malaysia
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Chen M, Xu N, Cao X, Zhou K, Chen Z, Wang Y, Liu C. Facilitated transport of anatase titanium dioxides nanoparticles in the presence of phosphate in saturated sands. J Colloid Interface Sci 2015; 451:134-43. [PMID: 25897849 DOI: 10.1016/j.jcis.2015.04.010] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 03/29/2015] [Accepted: 04/05/2015] [Indexed: 11/30/2022]
Abstract
Soil and water environments are inevitably contaminated by the excess of artificial nanoparticles (NPs) and phosphorus (P) fertilizers. There is a possibility of phosphate facilitating or inhibiting the transport of nanoparticles titanium dioxides (nTiO2). It is a great urgency and high priority to investigate the nTiO2 retention mechanisms and accurately describe the transport of nTiO2 in the presence of phosphate. Anatase nTiO2 with two sizes of 20 and 50nm through the saturated porous sand columns were observed under the conditions (0-50mM NaNO3 electrolyte, influent P concentrations of 0.10mM and 2.0mM, pH 6.5 and 7.5). The experimental results show the phosphate favor the dispersion of nTiO2, and consequently improve their transport patterns. The likely mechanism is that phosphate adsorption increasing the negative charge on the surface promotes the transportability of nTiO2 resulting from the low deposition rate and attachment efficiency of NPs. In particular, the facilitated transport of nTiO2 (50nm) is greater than those relative smaller as 20nm. In addition, this enhancement of nTiO2 transportability by phosphate at pH 6.5 is increased at higher pH of 7.5 due to the more negative zeta potential of surface, which indicates the potential risks to groundwater systems.
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Affiliation(s)
- Ming Chen
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Nan Xu
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
| | - Xinde Cao
- School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Kairong Zhou
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Zhigang Chen
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Yunlong Wang
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Cheng Liu
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
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Becker MD, Wang Y, L Paulsen J, Song YQ, Abriola LM, Pennell KD. In situ measurement and simulation of nano-magnetite mobility in porous media subject to transient salinity. NANOSCALE 2015; 7:1047-1057. [PMID: 25474703 DOI: 10.1039/c4nr05088f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Nanotechnologies have been proposed for a variety of environmental applications, including subsurface characterization, enhanced oil recovery, and in situ contaminant remediation. For such applications, quantitative predictive models will be of great utility for system design and implementation. Electrolyte chemistry, which can vary substantially within subsurface pore waters, has been shown to strongly influence nanoparticle aggregation and deposition in porous media. Thus, it is essential that mathematical models be capable of tracking changes in electrolyte chemistry and predicting its influence on nanoparticle mobility. In this work, a modified version of a multi-dimensional multispecies transport simulator (SEAWAT) was employed to model nanoparticle transport under transient electrolyte conditions. The modeling effort was supported by experimental measurements of paramagnetic magnetite (Fe3O4) nanoparticle, coated with polyacrylamide-methylpropane sulfonic acid - lauryl acrylate (nMag-PAMPS), mobility in columns packed with 40-50 mesh Ottawa sand. Column effluent analyses and magnetic resonance imaging (MRI) were used to quantify nanoparticle breakthrough and in situ aqueous phase concentrations, respectively. Experimental observations revealed that introduction of de-ionized water into the brine saturated column (80 g L(-1) NaCl + 20 g L(-1) CaCl2) promoted release and remobilization of deposited nanoparticles along a diagonal front, coincident with the variable density flow field. This behavior was accurately captured by the simulation results, which indicated that a two-site deposition-release model provided the best fit to experimental observations, suggesting that heterogeneous nanoparticle-surface interactions governed nanoparticle attachment. These findings illustrate the importance of accounting for both physical and chemical processes associated with changes in electrolyte chemistry when predicting nanoparticle transport behavior in subsurface formations.
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Affiliation(s)
- Matthew D Becker
- Department of Civil and Environmental Engineering, Tufts University, 200 College Avenue, Medford, Massachusetts 02155, USA.
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Toloni I, Lehmann F, Ackerer P. Modeling the effects of water velocity on TiO2 nanoparticles transport in saturated porous media. JOURNAL OF CONTAMINANT HYDROLOGY 2014; 171:42-48. [PMID: 25461886 DOI: 10.1016/j.jconhyd.2014.10.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Revised: 09/18/2014] [Accepted: 10/06/2014] [Indexed: 06/04/2023]
Abstract
The transport of manufactured titanium dioxide (TiO2, rutile) nanoparticles (NP) in porous media was investigated under saturated conditions. Experiments were carried out with different fluid velocities, with values in the range of observed velocities in alluvial aquifers. As reported on the literature for different kinds of NPs, the amount of retained NPs decreased when the water velocity increased. Moreover, no retention was observed for ionic strength values smaller than 5mM. A transport model coupling convective-dispersive transport with a Langmuirian kinetic deposition was used to fit the BTCs. Empirical linear equations were developed to estimate the attachment rate ka and the maximal solid phase concentration smax. Both parameters were found to be linearly depending on the collector efficiency (η0). It was also observed that attachment efficiency (α) did not change with increase of water velocity under the given experimental conditions and that the model had a low sensitivity to α. Based on these estimates of the retention parameters, the classical dispersion-convection model coupled with a Langmuir type adsorption model was able to reproduce quite well the observed TiO2 breakthrough curves for every fluid velocity used in the experiments.
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Affiliation(s)
- Ivan Toloni
- LHyGeS, UMR 7517 CNRS, Université de Strasbourg/EOST, 1 rue Blessig, 67084 Strasbourg Cedex, France.
| | - François Lehmann
- LHyGeS, UMR 7517 CNRS, Université de Strasbourg/EOST, 1 rue Blessig, 67084 Strasbourg Cedex, France
| | - Philippe Ackerer
- LHyGeS, UMR 7517 CNRS, Université de Strasbourg/EOST, 1 rue Blessig, 67084 Strasbourg Cedex, France
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Davoudi A, Salehpour A, Habibi A. Transport and Deposition of Alumina Nanoparticles in Water Saturated Porous Media: An Experimental Study. J DISPER SCI TECHNOL 2014. [DOI: 10.1080/01932691.2013.848407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kurlanda-Witek H, Ngwenya BT, Butler IB. Transport of bare and capped zinc oxide nanoparticles is dependent on porous medium composition. JOURNAL OF CONTAMINANT HYDROLOGY 2014; 162-163:17-26. [PMID: 24796515 DOI: 10.1016/j.jconhyd.2014.04.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Revised: 04/02/2014] [Accepted: 04/04/2014] [Indexed: 06/03/2023]
Abstract
Zinc oxide (ZnO) nanoparticles are one of the most frequently used nanoparticles in industry and hence are likely to be introduced to the groundwater environment. The mobility of these nanoparticles in different aquifer materials has not been assessed. While some studies have been published on the transport of ZnO nanoparticles in individual porous media, these studies do not generally account for varying porous medium composition both within and between aquifers. As a first step towards understanding the impact of this variability, this paper compares the transport of bare ZnO nanoparticles (bZnO-NPs) and capped ZnO nanoparticles, coated with tri-aminopropyltriethoxysilane (cZnO-NPs), in saturated columns packed with glass beads, fine grained sand and fine grained calcite, at near-neutral pH and groundwater salinity levels. With the exception of cZnO-NPs in sand columns, ZnO nanoparticles are highly immobile in all three types of studied porous media, with most retention taking place near the column inlet. Results are in general agreement with DLVO theory, and the deviation in experiments with cZnO-NPs flowing through columns packed with sand is linked to variability in zeta potential of the capped nanoparticles and sand grains. Therefore, differences in surface charge of nanoparticles and porous media are demonstrated to be key drivers in nanoparticle transport.
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Affiliation(s)
| | - B T Ngwenya
- School of GeoSciences, University of Edinburgh, Kings Buildings, West Mains Rd, EH9 3JW Edinburgh, United Kingdom
| | - I B Butler
- School of GeoSciences, University of Edinburgh, Kings Buildings, West Mains Rd, EH9 3JW Edinburgh, United Kingdom
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Lanphere JD, Rogers B, Luth C, Bolster CH, Walker SL. Stability and Transport of Graphene Oxide Nanoparticles in Groundwater and Surface Water. ENVIRONMENTAL ENGINEERING SCIENCE 2014; 31:350-359. [PMID: 25053876 PMCID: PMC4098073 DOI: 10.1089/ees.2013.0392] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Accepted: 01/10/2014] [Indexed: 05/11/2023]
Abstract
The effects of groundwater and surface water constituents (i.e., natural organic matter [NOM] and the presence of a complex assortment of ions) on graphene oxide nanoparticles (GONPs) were investigated to provide additional insight into the factors contributing to fate and the mechanisms involved in their transport in soil, groundwater, and surface water environments. The stability and transport of GONPs was investigated using dynamic light scattering, electrokinetic characterization, and packed bed column experiments. Stability results showed that the hydrodynamic diameter of the GONPs at a similar ionic strength (2.1±1.1 mM) was 10 times greater in groundwater environments compared with surface water and NaCl and MgCl2 suspensions. Transport results confirmed that in groundwater, GONPs are less stable and are more likely to be removed during transport in porous media. In surface water and MgCl2 and NaCl suspensions, the relative recovery was 94%±3% indicating that GONPs will be very mobile in surface waters. Additional experiments were carried out in monovalent (KCl) and divalent (CaCl2) salts across an environmentally relevant concentration range (0.1-10 mg/L) of NOM using Suwannee River humic acid. Overall, the transport and stability of GONPs was increased in the presence of NOM. This study confirms that planar "carbonaceous-oxide" materials follow traditional theory for stability and transport, both due to their response to ionic strength, valence, and NOM presence and is the first to look at GONP transport across a wide range of representative conditions found in surface and groundwater environments.
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Affiliation(s)
- Jacob D Lanphere
- Department of Chemical and Environmental Engineering, University of California , Riverside, California
| | - Brandon Rogers
- Department of Chemical and Environmental Engineering, University of California , Riverside, California
| | - Corey Luth
- Department of Chemical and Environmental Engineering, University of California , Riverside, California
| | - Carl H Bolster
- United States Department of Agriculture, Agricultural Research Service , Bowling Green, Kentucky
| | - Sharon L Walker
- Department of Chemical and Environmental Engineering, University of California , Riverside, California
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Virkutyte J, Al-Abed SR, Choi H, Bennett-Stamper C. Distinct structural behavior and transport of TiO 2 nano- and nanostructured particles in sand. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.11.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Li Z, Aly Hassan A, Sahle-Demessie E, Sorial GA. Transport of nanoparticles with dispersant through biofilm coated drinking water sand filters. WATER RESEARCH 2013; 47:6457-6466. [PMID: 24050685 DOI: 10.1016/j.watres.2013.08.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 08/14/2013] [Accepted: 08/17/2013] [Indexed: 06/02/2023]
Abstract
This article characterizes, experimentally and theoretically, the transport and retention of engineered nanoparticles (NP) through sand filters at drinking water treatment plants (DWTPs) under realistic conditions. The transport of four commonly used NPs (ZnO, CeO2, TiO2, and Ag, with bare surfaces and coating agents) through filter beds filled with sands from either acid washed and calcined, freshly acquired filter media, and used filter media from active filter media, were investigated. The study was conducted using water obtained upstream of the sand filter at DWTP. The results have shown that capping agents have a determinant importance in the colloidal stability and transport of NPs through the different filter media. The presence of the biofilm in used filter media increased adsorption of NPs but its effects in retaining capped NPs was less significant. The data was used to build a mathematical model based on the advection-dispersion equation. The model was used to simulate the performance of a scale-up sand filter and the effects on filtration cycle of traditional sand filtration system used in DWTPs.
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Affiliation(s)
- Zhen Li
- Environmental Engineering Program, School of Energy, Environmental, Biological, and Medical Engineering, University of Cincinnati, P.O. Box 210012, Cincinnati, OH 45221-0012, USA
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42
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Petosa AR, Ohl C, Rajput F, Tufenkji N. Mobility of nanosized cerium dioxide and polymeric capsules in quartz and loamy sands saturated with model and natural groundwaters. WATER RESEARCH 2013; 47:5889-5900. [PMID: 23916155 DOI: 10.1016/j.watres.2013.07.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Revised: 06/20/2013] [Accepted: 07/06/2013] [Indexed: 06/02/2023]
Abstract
The environmental and health risks posed by emerging engineered nanoparticles (ENPs) released into aquatic environments are largely dependent on their aggregation, transport, and deposition behavior. Herein, laboratory-scale columns were used to examine the mobility of polyacrylic acid (PAA)-coated cerium dioxide nanoparticles (nCeO2) and an analogous nanosized polymeric capsule (nCAP) in water saturated quartz sand or loamy sand. The influence of solution ionic strength (IS) and cation type (Na(+), Ca(2+), or Mg(2+)) on the transport potential of these ENPs was examined in both granular matrices and results were also compared to measurements obtained using a natural groundwater. ENP suspensions were characterized using dynamic light scattering and nanoparticle tracking analysis to establish aggregate size, and laser Doppler electrophoresis to determine ENP electrophoretic mobility. Regardless of IS, virtually all nCeO2 particles suspended in NaNO3 eluted from the quartz sand-packed columns. In contrast, heightened nCeO2 and nCAP particle retention and dynamic (time-dependent) transport behavior was observed with increasing concentrations of the divalent salts and in the presence of natural groundwater. Enhanced particle retention was also observed in loamy sand in comparison to the quartz sand, emphasizing the need to consider the nature of the aqueous matrix and granular medium in evaluating contamination risks associated with the release of ENPs in natural and engineered aquatic environments.
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Affiliation(s)
- Adamo Riccardo Petosa
- Department of Chemical Engineering, McGill University, 3610 University St., Montreal, Quebec, Canada H3A 2B2
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Meesters JAJ, Veltman K, Hendriks AJ, van de Meent D. Environmental exposure assessment of engineered nanoparticles: why REACH needs adjustment. INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT 2013; 9:e15-e26. [PMID: 23633247 DOI: 10.1002/ieam.1446] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 03/26/2013] [Accepted: 04/22/2013] [Indexed: 06/02/2023]
Abstract
Engineered nanomaterials (ENMs) possess novel properties making them attractive for application in a wide spectrum of fields. These novel properties are not accounted for in the environmental risk assessment methods that the Registration, Evaluation, Authorization, and Restriction of Chemicals (REACH) proposes in their guidance on environmental exposure estimation, although ENMs are already applied in a variety of consumer and industrial products. It is thus necessary to evaluate the guidance document REACH provides on environmental exposure estimation on its applicability to ENMs. This is most urgently the case for engineered nanoparticles (ENPs), as the novel properties are most often only applicable to them. The environmental fate of ENPs was reviewed and compared to the environmental fate of chemicals according to the REACH guidance. Major deviations between the fate of ENPs and predicted fate by REACH were found. They were related to at least 1 of 3 major assumptions made in REACH guidance: 1) in REACH, environmental alteration processes are all thought of as removal processes, whereas alterations of ENPs in the environment may greatly affect their properties, environmental effects, and behavior, 2) in REACH, chemicals are supposed to dissolve instantaneously and completely on release into the environment, whereas ENPs should be treated as nondissolved nanosized solids, and 3) in REACH, partitioning of dissolved chemicals to solid particles in air, water, and soil is estimated with thermodynamic equilibrium coefficients, but in the case of ENPs thermodynamic equilibrium between "dispersed" and "attached" states is generally not expected. The environmental exposure assessment of REACH therefore needs adjustment to cover the specific environmental fate of ENPs. Incorporation of the specific environmental fate processes of ENPs into the environmental risk assessment framework of REACH requires a pragmatic approach.
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El Badawy AM, Hassan AA, Scheckel KG, Suidan MT, Tolaymat TM. Key factors controlling the transport of silver nanoparticles in porous media. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:4039-45. [PMID: 23521179 DOI: 10.1021/es304580r] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The current study investigated the mobility of four silver nanoparticles (AgNPs) stabilized using different capping agents and represent the common stabilization mechanisms as well as surface charging scenarios in reactive and nonreactive porous media. The AgNPs were (1) uncoated H2-AgNPs (electrostatically stabilized) and (2) citrate coated AgNPs (Citrate-AgNPs) (electrostatically stabilized), (3) polyvinylpyrrolidone coated AgNPs (PVP-AgNPs) (sterically stabilized), and (4) branched polyethyleneimine coated AgNPs (BPEI-AgNPs) (electrosterically stabilized). The porous media were (1) quartz sand (QS), (2) ferrihydrite-coated sand (FcS), and (3) kaolin-coated sand (KcS). The H2-AgNPs and Citrate-AgNPs were readily mobile in QS but significantly retained in FcS and KcS with more deposition achieved in the KcS media. The deposition of the H2-AgNPs and Citrate-AgNPs followed the order of KcS > FcS > QS. The PVP-AgNPs breakthrough occurred more rapid as compared to the H2-AgNPs and Citrate-AgNPs but the deposition of PVP-AgNPs followed the same order of the electrostatically stabilized AgNPs (KcS > FcS > QS). The BPEI-AgNPs were readily mobile regardless of the porous media reactivity. Physicochemical interactions were the dominant filtration mechanism in the majority of the investigated cases but straining played the major role in the deposition of the electrostatically stabilized H2-AgNPs and Citrate-AgNPs in the KcS media. The results highlight the importance of both the stabilization mechanism and capping agent chemistry as key factors governing the transport of AgNPs in the environment.
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Affiliation(s)
- Amro M El Badawy
- Department of Environmental Engineering, University of Cincinnati, Cincinnati, Ohio 45221, USA
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Heidmann I. Metal oxide nanoparticle transport in porous media – an analysis about (un)certainties in environmental research. ACTA ACUST UNITED AC 2013. [DOI: 10.1088/1742-6596/429/1/012042] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Fang J, Xu MJ, Wang DJ, Wen B, Han JY. Modeling the transport of TiO2 nanoparticle aggregates in saturated and unsaturated granular media: effects of ionic strength and pH. WATER RESEARCH 2013; 47:1399-1408. [PMID: 23276424 DOI: 10.1016/j.watres.2012.12.005] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Revised: 10/23/2012] [Accepted: 12/06/2012] [Indexed: 05/29/2023]
Abstract
This study aims to explore the mechanisms governing the transport and retention kinetics of TiO(2) nanoparticle aggregates (NPAs) in flow-through columns of packed sand, particularly under unsaturated conditions. The study was carried out at different pHs (2.6, 7.1, and 9.6) and ionic strengths (ISs) (1.0, 10, and 50 mM). A two-site kinetic attachment model was used to describe transport behaviors of TiO(2) NPAs. At low ISs (i.e., 1.0 and 10 mM) and in neutral/alkaline conditions, high mobility of TiO(2) NPAs was observed in both saturated and unsaturated conditions. However, the retention of TiO(2) NPAs was substantially enhanced at the high IS (50 mM) and in extremely acidity condition (pH = 2.6), because of increased aggregation and straining of TiO(2) NPAs during their transport course. The breakthrough curves (BTCs) of TiO(2) NPAs under unsaturated and saturated conditions almost overlapped, suggesting that decreasing the water saturation did not enhance the retention of TiO(2) NPAs in sand columns. This was probably due to the repulsive interactions existed between negatively charged air-water and TiO(2) NPAs systems that resulted in unfavorable attachment conditions. The two-site kinetic attachment model provided a good description for the BTCs of TiO(2) NPAs both in saturated and unsaturated conditions. The fitted parameters could successfully explain the transport behaviors of TiO(2) NPAs under various solution chemistries.
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Affiliation(s)
- Jing Fang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China.
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47
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Furman O, Usenko S, Lau BLT. Relative importance of the humic and fulvic fractions of natural organic matter in the aggregation and deposition of silver nanoparticles. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:1349-1356. [PMID: 23298221 DOI: 10.1021/es303275g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
As engineered nanoparticles (NPs) are increasingly used, their entry into the environment has become an important topic for water sustainability. Recent investigations point to the critical role of natural organic matter (NOM) in altering the persistence of NPs by complexing with their surfaces. The NP-NOM complex, in turn, is the new entity that may potentially influence subsequent fate of NPs. To understand the relative impact of humic (HA) and fulvic fraction of NOM on the stability and mobility of silver nanoparticles (AgNPs), a combination of dynamic light scattering and quartz crystal microgravimetry with dissipation monitoring was used. In the absence of unbound NOM, (1) surface modification on either AgNP or silica substrate by different NOM fractions could lead to substantial changes in the extent and kinetics of AgNP aggregation and deposition, and (2) HA has a greater capability to enhance the transport of AgNPs by reducing their aggregation and deposition. With unbound NOM, HA seems to compete more successfully for binding sites on the substrate under electrostatically favorable conditions and formed a steric layer to prevent subsequent deposition of AgNPs. These findings highlighted the importance of NOM fraction in the overall environmental partitioning of AgNPs.
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Affiliation(s)
- Olha Furman
- Department of Environmental Science, Baylor University, One Bear Place #97266, Waco, Texas 76798, United States
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48
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Abstract
Instrumentation was constructed for the detection of automobile exhaust utilizing cataluminescence method on nanosized Fe3O4/SiO2.The microspheres with a diameter of about 450 nm, were synthesized by the hydrolyzation of tetraethyl orthosilicate (TEOS). The scanning electronic microscopy (SEM), transmission electronmicroscopy (TEM) and energy dispersive spectroscopy (EDS) were employed to characterize the microspheres. Automobile exhaust, a harmful gas, was selected as a model to investigate the cataluminescence sensing properties of the SiO2/Fe3O4 microspheres in the current work. Results indicated that the microspheres exhibited outstanding cataluminescence properties. The performance of the SiO2/Fe3O4 microspheres based sensor instrument suggested the promising application of the SiO2/Fe3O4 nanomaterials for the detection of automobile exhaust.
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49
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Hassan AA, Li Z, Sahle-Demessie E, Sorial GA. Computational fluid dynamics simulation of transport and retention of nanoparticle in saturated sand filters. JOURNAL OF HAZARDOUS MATERIALS 2013; 244-245:251-258. [PMID: 23270949 DOI: 10.1016/j.jhazmat.2012.11.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Revised: 10/31/2012] [Accepted: 11/07/2012] [Indexed: 06/01/2023]
Abstract
Experimental and computational investigation of the transport parameters of nanoparticles (NPs) flowing through porous media has been made. This work intends to develop a simulation applicable to the transport and retention of NPs in saturated porous media for investigating the effect of process conditions and operating parameters such, as ion strength, and filtration efficiency. Experimental data obtained from tracer and nano-ceria, CeO(2), breakthrough studies were used to characterize dispersion of nanoparticle with the flow and their interaction with sand packed columns with different heights. Nanoparticle transport and concentration dynamics were solved using the Eulerian computational fluid dynamics (CFD) solver ANSYS/FLUENT(®) based on a scaled down flow model. A numerical study using the Navier-Stokes equation with second order interaction terms was used to simulate the process. Parameters were estimated by fitting tracer, experimental NP transport data, and interaction of NP with the sand media. The model considers different concentrations of steady state inflow of NPs and different amounts of spike concentrations. Results suggest that steady state flow of dispersant-coated NPs would not be retained by a sand filter, while spike concentrations could be dampened effectively. Unlike analytical solutions, the CFD allows estimating flow profiles for structures with complex irregular geometry and uneven packing.
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Affiliation(s)
- Ashraf Aly Hassan
- U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, 26 W. Martin Luther King Drive, Cincinnati, OH 45268, USA
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50
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Zhao L, Peralta-Videa JR, Varela-Ramirez A, Castillo-Michel H, Li C, Zhang J, Aguilera RJ, Keller AA, Gardea-Torresdey JL. Effect of surface coating and organic matter on the uptake of CeO2 NPs by corn plants grown in soil: Insight into the uptake mechanism. JOURNAL OF HAZARDOUS MATERIALS 2012; 225-226:131-8. [PMID: 22633924 PMCID: PMC4346349 DOI: 10.1016/j.jhazmat.2012.05.008] [Citation(s) in RCA: 116] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2012] [Revised: 04/27/2012] [Accepted: 05/01/2012] [Indexed: 05/03/2023]
Abstract
Little is known about the fate, transport, and bioavailability of CeO(2) nanoparticles (NPs) in soil. Moreover, there are no reports on the effect of surface coating upon NPs uptake by plants. In this study, Zea mays plants were grown for one month in unenriched and organic soils treated with coated and uncoated CeO(2) NPs. In addition, plants were exposed to fluorescein isothiocyanate (FITC)-stained CeO(2) NPs and analyzed in a confocal microscope. In organic soil, roots from uncoated and coated NPs at 100, 200, 400, and 800mg kg(-1) had 40, 80, 130, and 260% and 10, 70, 90, and 40% more Ce, respectively, compared to roots from unenriched soil. Conversely, shoots of plants from unenriched soil had significantly more Ce compared with shoots from organic soil. Confocal fluorescence images showed FITC-stained CeO(2) NP aggregates in cell walls of epidermis and cortex, suggesting apoplastic pathway. The μXRF results revealed the presence of CeO(2) NP aggregates within vascular tissues. To the authors knowledge this is the first report on the effects of surface coating and organic matter on Ce uptake from CeO(2) NPs and upon the mechanisms of CeO(2) NPs uptake by higher plants.
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Affiliation(s)
- Lijuan Zhao
- Chemistry Department, The University of Texas at El Paso, 500 West Univ. Av., El Paso, TX 79968
| | - Jose R. Peralta-Videa
- Chemistry Department, The University of Texas at El Paso, 500 West Univ. Av., El Paso, TX 79968
| | - Armando Varela-Ramirez
- Department of Biological Sciences, The University of Texas at El Paso, 500 West Univ. Av., El Paso, TX 79968
| | | | - Chunqiang Li
- Physics Department, The University of Texas at El Paso, 500 West Univ. Av., El Paso, TX 79968
| | - Jianying Zhang
- Department of Biological Sciences, The University of Texas at El Paso, 500 West Univ. Av., El Paso, TX 79968
| | - Renato J. Aguilera
- Department of Biological Sciences, The University of Texas at El Paso, 500 West Univ. Av., El Paso, TX 79968
| | - Arturo A. Keller
- Bren School of Environmental Science & Management, UC Center for the Environmental Implications of Nanotechnology, 3420 Bren Hall, University of California, Santa Barbara, CA 93106
| | - Jorge L. Gardea-Torresdey
- Chemistry Department, The University of Texas at El Paso, 500 West Univ. Av., El Paso, TX 79968
- Environmental Science and Engineering PhD program, The University of Texas at El Paso, 500 West Univ. Av., El Paso, TX 79968
- Corresponding author (J. Gardea) ; phone 915-747-5359 fax (915)747-5748
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