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Serwatowska K, Nederstigt TAP, Peijnenburg WJGM, Vijver MG. Chronic toxicity of core-shell SiC/TiO 2 (nano)-particles to Daphnia magna under environmentally relevant food rations in the presence of humic acid. Nanotoxicology 2024; 18:107-118. [PMID: 38420713 PMCID: PMC11073049 DOI: 10.1080/17435390.2024.2321873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 02/16/2024] [Indexed: 03/02/2024]
Abstract
To date, research on the toxicity and potential environmental impacts of nanomaterials has predominantly focused on relatively simple and single-component materials, whilst more complex nanomaterials are currently entering commercial stages. The current study aimed to assess the long-term and size-dependent (60 and 500 nm) toxicity of a novel core-shell nanostructure consisting of a SiC core and TiO2 shell (SiC/TiO2, 5, 25, and 50 mg L-1) to the common model organism Daphnia magna. These novel core-shell nanostructures can be categorized as advanced materials. Experiments were conducted under environmentally realistic feeding rations and in the presence of a range of concentrations of humic acid (0.5, 2, 5, and 10 mg L-1 TOC). The findings show that although effect concentrations of SiC/TiO2 were several orders of magnitude lower than the current reported environmental concentrations of more abundantly used nanomaterials, humic acid can exacerbate the toxicity of SiC/TiO2 by reducing aggregation and sedimentation rates. The EC50 values (mean ± standard error) based on nominal SiC/TiO2 concentrations for the 60 nm particles were 28.0 ± 11.5 mg L-1 (TOC 0.5 mg L-1), 21.1 ± 3.7 mg L-1 (TOC 2 mg L-1), 18.3 ± 5.4 mg L-1 (TOC 5 mg L-1), and 17.8 ± 2.4 mg L-1 (TOC 10 mg L-1). For the 500 nm particles, the EC50 values were 34.9 ± 16.5 mg L-1 (TOC 0.5 mg L-1), 24.8 ± 5.6 mg L-1 (TOC 2 mg L-1), 28.0 ± 10.0 mg L-1 (TOC 5 mg L-1), and 23.2 ± 4.1 mg L-1 (TOC 10 mg L-1). We argue that fate-driven phenomena are often neglected in effect assessments, whilst environmental factors such as the presence of humic acid may significantly influence the toxicity of nanomaterials.
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Affiliation(s)
- Kornelia Serwatowska
- Institute of Environmental Sciences, University of Leiden, Leiden, The Netherlands
| | - Tom A. P. Nederstigt
- Institute of Environmental Sciences, University of Leiden, Leiden, The Netherlands
| | - Willie J. G. M. Peijnenburg
- Institute of Environmental Sciences, University of Leiden, Leiden, The Netherlands
- Center for Safety of Substances and Products, National Institute for Public Health and the Environment, Bilthoven, The Netherlands
| | - Martina G. Vijver
- Institute of Environmental Sciences, University of Leiden, Leiden, The Netherlands
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2
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Zhang M, Wei W, Chen Y, Han X. Effects of Cr(VI) oxyanion, humic acid and solution chemistry on the aggregation and colloidal stability of green synthesized chlorapatite nanoparticles. CHEMOSPHERE 2023; 342:140147. [PMID: 37716557 DOI: 10.1016/j.chemosphere.2023.140147] [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: 04/28/2023] [Revised: 08/19/2023] [Accepted: 09/10/2023] [Indexed: 09/18/2023]
Abstract
Aggregation is a crucial process determining the fate, mobility and ecological risks of nanomaterials. Chlorapatite nanoparticles (nClAP) exhibit widely applications in environmental remediation and consequently will inevitably enter aquatic systems. However, the aggregation characteristics of nClAP are still mostly uncovered. This study investigated the aggregation kinetics and colloidal stability of nClAP as a function of pH, humic acid (HA), Cr(VI) oxyanions, monovalent and divalent electrolytes. Results showed that pH values from 5 to 9 had a notable impact on the aqueous behaviors of nClAP. The addition of HA made the zeta potential (ZP) of nClAP more negative and thus enhanced nClAP stability through electrostatic and steric effects. Similarly, the adsorption of Cr(VI) on the surface of nClAP created a physical barrier and negative charge, improving the stability of nClAP by inducing steric force. Lower ZP and hydrodynamic diameter (HDD) reflected that the enhanced stability of nClAP by HA was more significant than Cr(VI). In comparison, the presence of Ca2+ ions were more effective than monovalent Na + ions in promoting the aggregation of nClAP. The classical DLVO theory incorporating the steric repulsion were used to interpret the aggregation and dispersion of nClAP, making it was easier to overcome energy barriers and agglomerate. This study provides new mechanistic insights which could help better understand the effects of Cr(VI) oxyanions and HA on nClAP's colloidal stability.
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Affiliation(s)
- Mengjia Zhang
- School of Environment, Jiangsu Engineering Lab of Water and Soil Eco-Remediation, Jiangsu Province Engineering Research Center of Environmental Risk Prevention and Emergency Response Technology, Nanjing Normal University, Nanjing, 210023, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China
| | - Wei Wei
- School of Environment, Jiangsu Engineering Lab of Water and Soil Eco-Remediation, Jiangsu Province Engineering Research Center of Environmental Risk Prevention and Emergency Response Technology, Nanjing Normal University, Nanjing, 210023, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China.
| | - Yang Chen
- School of Environment, Jiangsu Engineering Lab of Water and Soil Eco-Remediation, Jiangsu Province Engineering Research Center of Environmental Risk Prevention and Emergency Response Technology, Nanjing Normal University, Nanjing, 210023, China
| | - Xuan Han
- School of Environment, Jiangsu Engineering Lab of Water and Soil Eco-Remediation, Jiangsu Province Engineering Research Center of Environmental Risk Prevention and Emergency Response Technology, Nanjing Normal University, Nanjing, 210023, China
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Avellán-Llaguno RD, Zhang X, Zhao P, Velez A, Cruz M, Kikuchi J, Dong S, Huang Q. Differential aggregation of polystyrene and titanium dioxide nanoparticles under various salinity conditions and against multiple proteins types. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:74173-74184. [PMID: 35644000 DOI: 10.1007/s11356-022-20729-6] [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: 12/20/2021] [Accepted: 05/05/2022] [Indexed: 06/15/2023]
Abstract
The interaction of nanoplastics (NPls) and engineered nanoparticles (ENPs) with organic matter and environmental pollutants is particularly important. Therefore, their behavior should be investigated under the different salinity conditions, mimicking rivers and coastal environments, to understand this phenomenon in those areas. In this work, we analyzed the elementary characteristics of polystyrene-PS (unmodified surface and modified with amino or carboxyl groups) and titanium dioxide-TiO2 nanoparticles. The effect of salinity on their colloidal properties was studied too. Also, the interaction with different types of proteins (bovine serum albumin-BSA and tilapia proteins), as well as the formation of the BSA corona and its effect on the colloidal stability of nanoparticles, were evaluated. The morphology and dispersion of sizes were more uniform in unmodified-surface PS-NPs (70.5 ± 13.7 nm) than in TiO2-NPs (131.2 ± 125.6 nm). Likewise, Rama spectroscopy allowed recognizing peaks associated with the PS phenyl group aromatic ring in unmodified-surface PS-NPs (621, 1002, 1582, and 1602 cm-1). For TiO2-NPs, the data suggest belonging to the tetragonal form, also known as rutile (445, 610 cm-1). The elevation of salinity dose-dependently decreased NP colloid stability, with more significant variation in the PS-NPs compared to TiO2-NPs. The organic matter is also involved in this phenomenon, differentially as a function of time compared to its absence (unmodified-surface PS-NPs 30 psu/TOC 5 mgL-1/24 h: 2876.6 ± 378.03 nm; unmodified-surface PS-NPs 30 psu/24 h: 2133 ± 49.57 nm). In general, the TiO2-NPs demonstrated greater affinity with all proteins tested (0.066 g/L). It was observed that morphology, size, and surface chemical modification intervene in a relevant way in the interaction of the nanoparticles with bovine serum albumin (unmodified-surface PS-NPs 298 K: 6.08E+02; 310 K: 6.63E+02; TiO2-NPs 298 K: 8.76E+02; 310 K: 1.05E+03 L mol-1) and tilapia tissues proteins (from blood, gills, liver, and brain). Their morphology and size also determined the protein corona formation and the NPs' agglomeration. These findings can provide references during knowledge transfer between NPls and ENPs.
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Affiliation(s)
- Ricardo David Avellán-Llaguno
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, People's Republic of China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
| | - Xu Zhang
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, People's Republic of China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
| | - Peiqiang Zhao
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, People's Republic of China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
| | - Alberto Velez
- Agencia de Regulación Y Control de La Bioseguridad Y Cuarentena Para Galápagos, Puerto Ayora, 200105, Ecuador
| | - Marilyn Cruz
- Agencia de Regulación Y Control de La Bioseguridad Y Cuarentena Para Galápagos, Puerto Ayora, 200105, Ecuador
| | - Jun Kikuchi
- RIKEN Center for Sustainable Resource Science, Yokohama, 230-0045, Japan
| | - Sijun Dong
- College of Life Sciences, Institute of Life Sciences and Green Development, Hebei University, Baoding, 071002, People's Republic of China
| | - Qiansheng Huang
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, People's Republic of China.
- National Basic Science Data Center, Beijing, 100190, People's Republic of China.
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4
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Chen Z, Zhu Y, Xu Y, Xia Z, Li X. Photocatalytic Degradation Performance of Fluorine and Nitrogen Co‐doped TiO
2
/AC Composites over Printing and Dyeing Wastewater under Visible‐Light Irradiation. ChemistrySelect 2022. [DOI: 10.1002/slct.202104230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Zhen Chen
- Faculty of Maritime and Transportation Ningbo University Ningbo 315211 PR China
| | - Yingying Zhu
- Faculty of Maritime and Transportation Ningbo University Ningbo 315211 PR China
| | - Yang Xu
- Faculty of Maritime and Transportation Ningbo University Ningbo 315211 PR China
| | - Zhenguo Xia
- Faculty of Maritime and Transportation Ningbo University Ningbo 315211 PR China
| | - Xinbao Li
- Faculty of Maritime and Transportation Ningbo University Ningbo 315211 PR China
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Venezia V, Pota G, Silvestri B, Vitiello G, Di Donato P, Landi G, Mollo V, Verrillo M, Cangemi S, Piccolo A, Luciani G. A study on structural evolution of hybrid humic Acids-SiO 2 nanostructures in pure water: Effects on physico-chemical and functional properties. CHEMOSPHERE 2022; 287:131985. [PMID: 34454229 DOI: 10.1016/j.chemosphere.2021.131985] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 08/20/2021] [Accepted: 08/20/2021] [Indexed: 06/13/2023]
Abstract
Humic acids (HA) are considered a promising and inexpensive source for novel multifunctional materials for a huge range of applications. However, aggregation and degradation phenomena in aqueous environment prevent from their full exploitation. A valid strategy to address these issues relies on combining HA moieties at the molecular scale with an inorganic nanostructured component, leading to more stable hybrid nanomaterials with tunable functionalities. Indeed, chemical composition of HA can determine their interactions with the inorganic constituent in the hybrid nanoparticles and consequently affect their overall physico-chemical properties, including their stability and functional properties in aqueous environment. As a fundamental contribution to HA materials-based technology, this study aims at unveiling this aspect. To this purpose, SiO2 nanoparticles have been chosen as a model platform and three different HAs extracted from composted biomasses, manure (HA_Man), artichoke residues (HA_Art) and coffee grounds (HA_Cof), were employed to synthetize hybrid HA-SiO2 nanoparticles through in-situ sol-gel synthesis. Prepared samples were submitted to aging in water to assess their stability. Furthermore, antioxidant properties and physico-chemical properties of both as prepared and aged samples in aqueous environment were assessed through Scanning Electron Microscopy (SEM), N2 physisorption, Simultaneous Thermogravimetric (TGA) and Differential Scanning Calorimetric (DSC) Analysis, Fourier Transform Infrared (FT-IR), Nuclear Magnetic Resonance (NMR), Electron Paramagnetic Resonance (EPR) spectroscopies. The experimental results highlighted that hybrid HA-SiO2 nanostructures acted as dynamic systems which exhibit structural supramolecular reorganization during aging in aqueous environment with marked effects on physico-chemical and functional properties, including improved antioxidant activity. Obtained results enlighten a unique aspect of interactions between HA and inorganic nanoparticles that could be useful to predict their behavior in aqueous environment. Furthermore, the proposed approach traces a technological route for the exploitation of organic biowaste in the design of hybrid nanomaterials, providing a significant contribution to the development of waste to wealth strategies based on humic substances.
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Affiliation(s)
- Virginia Venezia
- Department of Chemical, Materials and Production Engineering, University of Naples "Federico II", p.le V. Tecchio 80, 80125, Naples, Italy.
| | - Giulio Pota
- Department of Chemical, Materials and Production Engineering, University of Naples "Federico II", p.le V. Tecchio 80, 80125, Naples, Italy.
| | - Brigida Silvestri
- Department of Chemical, Materials and Production Engineering, University of Naples "Federico II", p.le V. Tecchio 80, 80125, Naples, Italy.
| | - Giuseppe Vitiello
- Department of Chemical, Materials and Production Engineering, University of Naples "Federico II", p.le V. Tecchio 80, 80125, Naples, Italy; CSGI, Center for Colloids and Surface Science, via della Lastruccia 3, 50019, Florence, Italy.
| | - Paola Di Donato
- Department of Science and Technology, University of Naples "Parthenope", Centro Direzionale Isola C4, 80143, Naples, Italy.
| | - Gianluca Landi
- Institute of Sciences and Technologies for Sustainable Energy and Mobility-CNR, P.le V. Tecchio 80, 80125, Naples, Italy.
| | - Valentina Mollo
- Center for Advanced Biomaterials for Health Care, Istituto Italiano di Tecnologia@CABHC, Largo Barsanti e Matteucci 53, 80125, Naples, Italy.
| | - Mariavittoria Verrillo
- Centro Interdipartimentale di Ricerca sulla Risonanza Magnetica Nucleare per l'Ambiente, l'Agroalimentare ed i Nuovi Materiali (CERMANU), University of Naples "Federico II", Via Università 100, 80055, Portici, Italy.
| | - Silvana Cangemi
- Centro Interdipartimentale di Ricerca sulla Risonanza Magnetica Nucleare per l'Ambiente, l'Agroalimentare ed i Nuovi Materiali (CERMANU), University of Naples "Federico II", Via Università 100, 80055, Portici, Italy.
| | - Alessandro Piccolo
- Centro Interdipartimentale di Ricerca sulla Risonanza Magnetica Nucleare per l'Ambiente, l'Agroalimentare ed i Nuovi Materiali (CERMANU), University of Naples "Federico II", Via Università 100, 80055, Portici, Italy.
| | - Giuseppina Luciani
- Department of Chemical, Materials and Production Engineering, University of Naples "Federico II", p.le V. Tecchio 80, 80125, Naples, Italy.
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6
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Lee YS, Kim YM, Lee J, Kim JY. Evaluation of silver nanoparticles (AgNPs) penetration through a clay liner in landfills. JOURNAL OF HAZARDOUS MATERIALS 2021; 404:124098. [PMID: 33053470 DOI: 10.1016/j.jhazmat.2020.124098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 09/05/2020] [Accepted: 09/23/2020] [Indexed: 06/11/2023]
Abstract
Most products containing engineered nanomaterials are disposed at landfills in the final stage of their lifecycle. This study aims to assess landfill liners as a final barrier of disposed silver nanoparticles (AgNPs). Sorption and transport of AgNPs were investigated in the laboratory-scale simulation of landfill liner conditions. Field soil (silt loam) and bentonite were tested in batch sorption experiments respectively. To test transportation, 3 cm thick mixture of the field soil and the bentonite constituted the porous media to meet the criteria for compacted clay liner of landfill. Mathematical modeling in the experimental and actual landfill conditions was also conducted. The results demonstrated considerable extent of sorption by both types of sorbents. The breakthrough of AgNPs was not observed for 200 days (over 20 pore volume). In general, the experimental results indicated that AgNPs cannot easily pass through the landfill clay liner under present standards. Modeling results also showed that AgNPs could be blocked effectively. Although long-term tests are still required, these results clearly show resistance to current sanitary landfill liners against AgNP penetration. As the trial to assess the safety of landfills against AgNP migration, this work provides insights into the fate and transport of nanomaterials in the landfill environment.
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Affiliation(s)
- Young Su Lee
- Department of Civil and Environmental Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, South Korea
| | - Yeong Min Kim
- Department of Civil and Environmental Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, South Korea
| | - Jongkeun Lee
- Department of Civil and Environmental Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, South Korea
| | - Jae Young Kim
- Department of Civil and Environmental Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, South Korea.
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7
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Lunardi CN, Gomes AJ, Rocha FS, De Tommaso J, Patience GS. Experimental methods in chemical engineering: Zeta potential. CAN J CHEM ENG 2021. [DOI: 10.1002/cjce.23914] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Claure N. Lunardi
- Laboratory of Photochemistry and Nanobiotechnology University of Brasília Brasília Brazil
| | - Anderson J. Gomes
- Laboratory of Photochemistry and Nanobiotechnology University of Brasília Brasília Brazil
| | - Fellipy S. Rocha
- Laboratory of Photochemistry and Nanobiotechnology University of Brasília Brasília Brazil
- Chemical Engineering Polytechnique Montréal Montréal Québec Canada
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Microwave-Assisted Synthesis of Water-Dispersible Humate-Coated Magnetite Nanoparticles: Relation of Coating Process Parameters to the Properties of Nanoparticles. NANOMATERIALS 2020; 10:nano10081558. [PMID: 32784384 PMCID: PMC7466618 DOI: 10.3390/nano10081558] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 07/23/2020] [Accepted: 08/06/2020] [Indexed: 01/25/2023]
Abstract
Nowadays, there is a demand in the production of nontoxic multifunctional magnetic materials possessing both high colloidal stability in water solutions and high magnetization. In this work, a series of water-dispersible natural humate-polyanion coated superparamagnetic magnetite nanoparticles has been synthesized via microwave-assisted synthesis without the use of inert atmosphere. An impact of a biocompatible humate-anion as a coating agent on the structural and physical properties of nanoparticles has been established. The injection of humate-polyanion at various synthesis stages leads to differences in the physical properties of the obtained nanomaterials. Depending on the synthesis protocol, nanoparticles are characterized by improved monodispersity, smaller crystallite and grain size (up to 8.2 nm), a shift in the point of zero charge (6.4 pH), enhanced colloidal stability in model solutions, and enhanced magnetization (80 emu g−1).
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9
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Lv Y, Huang S, Huang G, Liu Y, Yang G, Lin C, Xiao G, Wang Y, Liu M. Remediation of organic arsenic contaminants with heterogeneous Fenton process mediated by SiO 2-coated nano zero-valent iron. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:12017-12029. [PMID: 31983004 DOI: 10.1007/s11356-020-07808-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 01/21/2020] [Indexed: 06/10/2023]
Abstract
Given their considerable solubility in water and potentially high toxicity to human health, organoarsenic compounds have become an emerging contaminant. Herein, a heterogeneous Fenton process mediated by SiO2-coated nano zero-valent iron (SiO2-nZVI) was employed to simultaneously remove the p-arsanilic acid (p-ASA, a typical organoarsenic compound) and the released arsenic. The initial pH value significantly influenced on the degradation of p-ASA and at the optimal pH (3.0), p-ASA (10 mg L-1) could be completely oxidized to As(V), NH4+, and plentiful phenolic compounds such as phenol and p-hydroquinone via the cleavage of C-N and C-As bonds within 60 min in pure water. Meanwhile, although the formed lepidocrocite and magnetite on the surface of SiO2-nZVI significantly limited the reutilization, they played a vital role in the adsorption of the released As(V) and the residual arsenic levels in the effluent were as low as 0.031 mg L-1, meeting both the drinking water standard of the World Health Organization (WHO) and the surface water standard of China (0.05 mg L-1). Furthermore, high-level dissolved organic matters (DOM) (> 2 mg C L-1) exhibited strong interference with both the oxidation of p-ASA and adsorption of arsenic, but the interference could be eliminated by increasing the SiO2-nZVI dosage or adding H2O2. Importantly, this system could completely remediate p-ASA in a short time and simultaneously avoid the secondary pollution caused by inorganic arsenic, which was significant for the remediation of organoarsenic pollutants in swine wastewater.
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Affiliation(s)
- Yuancai Lv
- Fujian Provincial Engineering Research Center for High-value Utilization Technology of Plant Resources, College of Environment & Resources, Fuzhou University, No. 2 Xueyuan Road, Shangjie Town, Minhou County, Fuzhou, 350116, Fujian, China
- Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants, Putian University, Putian, 351100, China
| | - Siyi Huang
- Fujian Provincial Engineering Research Center for High-value Utilization Technology of Plant Resources, College of Environment & Resources, Fuzhou University, No. 2 Xueyuan Road, Shangjie Town, Minhou County, Fuzhou, 350116, Fujian, China
| | - Guofu Huang
- School of Chemical Engineering and Environment, Weifang University of Science and Technology, Shouguang, 262700, China
| | - Yifan Liu
- Fujian Provincial Engineering Research Center for High-value Utilization Technology of Plant Resources, College of Environment & Resources, Fuzhou University, No. 2 Xueyuan Road, Shangjie Town, Minhou County, Fuzhou, 350116, Fujian, China
- Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants, Putian University, Putian, 351100, China
| | - Guifang Yang
- Fujian Provincial Engineering Research Center for High-value Utilization Technology of Plant Resources, College of Environment & Resources, Fuzhou University, No. 2 Xueyuan Road, Shangjie Town, Minhou County, Fuzhou, 350116, Fujian, China
| | - Chunxiang Lin
- Fujian Provincial Engineering Research Center for High-value Utilization Technology of Plant Resources, College of Environment & Resources, Fuzhou University, No. 2 Xueyuan Road, Shangjie Town, Minhou County, Fuzhou, 350116, Fujian, China
| | - Gao Xiao
- Fujian Provincial Engineering Research Center for High-value Utilization Technology of Plant Resources, College of Environment & Resources, Fuzhou University, No. 2 Xueyuan Road, Shangjie Town, Minhou County, Fuzhou, 350116, Fujian, China
| | - Yonghao Wang
- Fujian Provincial Engineering Research Center for High-value Utilization Technology of Plant Resources, College of Environment & Resources, Fuzhou University, No. 2 Xueyuan Road, Shangjie Town, Minhou County, Fuzhou, 350116, Fujian, China.
| | - Minghua Liu
- Fujian Provincial Engineering Research Center for High-value Utilization Technology of Plant Resources, College of Environment & Resources, Fuzhou University, No. 2 Xueyuan Road, Shangjie Town, Minhou County, Fuzhou, 350116, Fujian, China.
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10
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Zhao T, Fang M, Tang Z, Zhao X, Wu F, Giesy JP. Adsorption, aggregation and sedimentation of titanium dioxide nanoparticles and nanotubes in the presence of different sources of humic acids. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 692:660-668. [PMID: 31539974 DOI: 10.1016/j.scitotenv.2019.07.312] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 07/18/2019] [Accepted: 07/19/2019] [Indexed: 06/10/2023]
Abstract
Environmental behavior, bioavailability and risks posed by TiO2, nanomaterials (TiO2 NMs) in surface waters are affected by morphologies of the particles and geochemistry, including pH, inorganic and organic matter. Here, the adsorption, aggregation and sedimentation of TiO2 nanoparticles (TiO2 NPs) and nanotubes (TiO2 NTs) were investigated in the presence of Elliott Soil humic acid (HAE) and Suwannee River humic acids (HAS). The adsorption amount of HA on TiO2 NMs was inversely proportional to pH of solution. Maximum adsorption amount of HA on the surface of TiO2 NMs follows the order TiO2 NPs + HAE (236.05 mg/g) > TiO2 NTs + HAE (146.05 mg/g) > TiO2 NTs + HAS (70.66 mg/g) > TiO2 NPs + HAS (37.48 mg/g). Stability of TiO2 NPs and TiO2 NTs largely depended on their isoelectric point, morphology and solution pH in the absence of HA. Dispersion of TiO2 NMs was enhanced with solution pH deviated from the isoelectric point of nanomaterials due to electrostatic repulsion. Moreover, tubular structures of TiO2 NTs with higher length-diameter ratio seem to aggregate more easily than dose sphere-like TiO2 NPs. This might be due to their spherical structure enhancing steric repulsion. Notably, the adsorption of HA led to disagglomeration and significant stability of TiO2 NPs and TiO2 NTs due to steric hindrance under varying solution pH. In addition, adsorption time, concentration and sources of HA also influenced suspension/sedimentation behavior of TiO2 NPs and TiO2 NTs, and aromatic-rich HAE stabilized TiO2 NMs suspension more aggressively than aliphatic-rich HAS.
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Affiliation(s)
- Tianhui Zhao
- College of Water Sciences, Beijing Normal University, Beijing 100875, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Mengyuan Fang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650550, China
| | - Zhi Tang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
| | - Xiaoli Zhao
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Fengchang Wu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - John P Giesy
- Department of Veterinary Biomedical Sciences and Toxicology Centre, University of Saskatchewan, Saskatoon, Saskatchewan, Canada; Department of Environmental Science, Baylor University, Waco, TX, United States
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11
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Mao K, Wu X, Min X, Huang Z, Liu YG, Fang M. New Efficient Visible-Light-Driven Photocatalyst of Chitin-Modified Titanium Dioxide/Carbon Fiber Composites for Wastewater. Sci Rep 2019; 9:16321. [PMID: 31705034 PMCID: PMC6841960 DOI: 10.1038/s41598-019-52833-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 10/24/2019] [Indexed: 01/12/2023] Open
Abstract
To improve the catalyst properties of TiO2 under visible light irradiation, chitin-modified TiO2 was synthesized via a hydrothermal method on the surface of carbon fibers. The microstructure and interface properties of the so-prepared photocatalyst were investigated via X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and UV-visible diffuse reflectance spectroscopy. Our results indicated that the synergetic effect of the crystal phase of TiO2, carbon fiber, and chitin is the main reason leading to the improvement of the photocatalytic activity of the composite catalyst. The modified TiO2 sample with chitin content of 0.6 wt% exhibited the highest photocatalytic activity under visible light irradiation when RhB was chosen as the target degradation product. Compared to the pure TiO2/carbon fiber, the sample of TiO2/carbon fiber with 0.6 wt% of chitin exhibits enhanced visible light activity with an apparent rate of degradation about 2.25 times. The enhancement of the photocatalytic performance of the sample with chitin can be attributed to the relatively high adsorption capacity of the particular network structure and photosensitivity of chitin, which can effectively separate the photoelectron-hole pair recombination. Furthermore, the new composite photocatalyst shows excellent catalytic stability after multiple degradation cycles, indicating that it is a promising photocatalytic material for degrading organic pollutants in wastewater.
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Affiliation(s)
- Kui Mao
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing, 100083, China
| | - Xiaowen Wu
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing, 100083, China.
| | - Xin Min
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing, 100083, China
| | - Zhaohui Huang
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing, 100083, China
| | - Yan-Gai Liu
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing, 100083, China
| | - Minghao Fang
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing, 100083, China
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Zhao T, Fang M, Tang Z, Zhao X, Xie F, Wu F, Giesy JP. Effects of fulvic acid on aggregation, sedimentation, and adsorption of Fe 3O 4 magnetic nanoparticles. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:21463-21474. [PMID: 31127516 DOI: 10.1007/s11356-019-05441-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 05/09/2019] [Indexed: 05/24/2023]
Abstract
Environmental behavior, bioavailability, and risks posed by Fe3O4, magnetic nanoparticles (Fe3O4 NPs) in surface waters are affected by complex geochemistry, including pH and inorganic and organic matter. This work provides a systematic analysis of adsorption of fulvic acid (FA) on surfaces of Fe3O4 NPs with adsorption kinetics, adsorption thermodynamic, and adsorption isotherm. Adsorption of FA on surfaces of Fe3O4 NPs is consistent with assumptions of Langmuir and Freundlich adsorption isotherm models. The adsorption amount of FA was inversely proportional to solution pH, and the maximum amount is 128.6 mg g-1. Adsorption of FA on surfaces of Fe3O4 NPs is a spontaneous endothermic process. FA plays an important role in aggregation and suspension/sedimentation behavior of Fe3O4 NPs in aquatic environmental. With continuous adsorption of FA, electrostatic repulsion between the particles and the steric hindrance of FA significantly decreased aggregation and increased suspension of Fe3O4 NPs. The results of FTIR and XPS indicated that FA was adsorbed on Fe3O4 NPs mainly through chemical reactions, and carbohydrates particularly play an important role in adsorption.
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Affiliation(s)
- Tianhui Zhao
- College of Water Sciences, Beijing Normal University, Beijing, 100875, China
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Mengyuan Fang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
- Faculty of Environmental Science and Engineering, Kuming University of Science and Technology, Kuming, 650550, Yunnan, China
| | - Zhi Tang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
| | - Xiaoli Zhao
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
| | - Fazhi Xie
- School of Material Science and Chemical Engineering, Anhui Jianzhu University, Hefei, 230601, Anhui, China
| | - Fengchang Wu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - John P Giesy
- Department of Veterinary Biomedical Sciences and Toxicology Centre, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- Department of Environmental Science, Baylor University, Waco, TX, USA
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Yin X, Jiang Y, Tan Y, Meng X, Sun H, Wang N. Co-transport of graphene oxide and heavy metal ions in surface-modified porous media. CHEMOSPHERE 2019; 218:1-13. [PMID: 30458243 DOI: 10.1016/j.chemosphere.2018.11.089] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 10/19/2018] [Accepted: 11/12/2018] [Indexed: 06/09/2023]
Abstract
The ability to predict the transport of heavy metal ions in porous media with different surface characteristics is crucial to protect groundwater quality and public health. In this study, the effects of graphene oxide (GO) on co-transport and remobilization of Pb2+ and Cd2+ in humic acid (HA), smectite, kaolinite, and ferrihydrite-coated sand media were evaluated via laboratory packed-column experiments. Scanning electron microscope and energy dispersive X-ray analysis showed that the surface morphology of the coated sands was quite different and that ∼56.7-89.9% of the surface was covered by the coating and the major elemental components were C, O, Si, Al, and Fe. GO exhibited high mobility in HA, kaolinite, and smectite-coated sand, but showed high retention in ferrihydrite-coated sand. While GO reduced the transport of Pb2+ and Cd2+, both metal ions also reduced the mobility of GO in coated-sand columns. Elution experiments revealed that GO led to the remobilization and release of the previously sorbed Pb2+ and Cd2+ from the coated sand. However, GO could not release Pb2+ and Cd2+ from smectite-coated sand columns, probably because smectite has stronger adsorption affinity to the heavy metals than GO. Derjaguin-Landau-Verwey-Overbeek calculations were employed and explained the GO transport behavior in the columns well. Furthermore, the advection-dispersion-reaction equation simulated the cotransport of Pb2+ and Cd2+ with GO in the coated sand well. These results are expected to provide insight into the potential impact of coexisting nanomaterials with contaminants in vulnerable soil and groundwater systems.
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Affiliation(s)
- Xianqiang Yin
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, 712100, China.
| | - Yanji Jiang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China
| | - Yuehui Tan
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China
| | - Xiangmin Meng
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China
| | - Huimin Sun
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, 712100, China
| | - Nong Wang
- Agro-Environmental Protection Institute, Ministry of Agriculture of the People's Republic of China Tianjin, 300191, China
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14
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Simelane S, Dlamini LN. An investigation of the fate and behaviour of a mixture of WO 3 and TiO 2 nanoparticles in a wastewater treatment plant. J Environ Sci (China) 2019; 76:37-47. [PMID: 30528029 DOI: 10.1016/j.jes.2018.03.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 03/06/2018] [Accepted: 03/16/2018] [Indexed: 05/24/2023]
Abstract
The fate and behaviour of WO3 and TiO2 mixture were investigated following the Organisation for Economic Co-operation and Development 303A guidelines. The nanoparticles were found not to influence the chemical oxygen demand removal efficiency which was maintained >80% hence the activated sludge process was on affected. The nanoparticles were eliminated from the wastewater with a greater percentage of 99.8% for TiO2 and 95.5% for WO3 found in the sludge. The activated sludge process also had no effect of the polymorphs of the nanoparticles as X-ray diffraction revealed presence of monoclinic WO3 and anatase TiO2 which were spiked into the influent. The nanoparticles were mainly removed by bio-adsorption on the activated sludge surface. The total plate count revealed that the bacterial colonies present in the control and the test units were comparable during the gradual introduction of nanoparticles in the chambers. The biomass was >0.75 MLVSS/MLSS (mixed liquor volatile suspended solids/mixed liquor suspended solids) in both the aeration vessels thus a greater proportion of the sludge were the microorganisms. A greater percentage of the Ti and W found in the effluent was mainly due to the nanoparticles adsorbed on the suspended solids with only 3.6% Ti and 28.6% W due to dissolution of nanoparticles.
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Affiliation(s)
- Sandile Simelane
- Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus, Doornfontein, Johannesburg 2028, South Africa
| | - Langelihle Nsikayezwe Dlamini
- Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus, Doornfontein, Johannesburg 2028, South Africa.
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15
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Gupta GS, Kansara K, Shah H, Rathod R, Valecha D, Gogisetty S, Joshi P, Kumar A. Impact of humic acid on the fate and toxicity of titanium dioxide nanoparticles in Tetrahymena pyriformis and zebrafish embryos. NANOSCALE ADVANCES 2019; 1:219-227. [PMID: 36132460 PMCID: PMC9473283 DOI: 10.1039/c8na00053k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Accepted: 07/18/2018] [Indexed: 06/10/2023]
Abstract
The extensive usage of titanium dioxide (TiO2) nanoparticles in daily usage products have increased their release into the environment. The present study has attempted to investigate the behaviour of titanium dioxide (TiO2) nanoparticles in different experimental buffers in the presence of humic acid. Also, the effect of TiO2 nanoparticles was assessed in different aquatic organisms with and without the presence of humic acid. The results demonstrate that humic acid increases the dispersion of TiO2 nanoparticles via its adsorption on the surface of the nanoparticles, mainly due to electrostatic interactions. The maximum aggregation was observed in the zebrafish growth medium (E3 medium) even in the presence of humic acid. The intensity of TiO2 nanoparticle sedimentation was observed in the order: E3 media > Dryl's buffer > MilliQ water. Interestingly, the ecotoxicity results for Tetrahymena pyriformis and Danio rerio showed that the presence of humic acid reduces the toxicity of TiO2 nanoparticles.
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Affiliation(s)
- Govind Sharan Gupta
- Biological & Life Sciences, School of Arts & Sciences, Ahmedabad University Central Campus, Navrangpura Ahmedabad 380009 Gujarat India
| | - Krupa Kansara
- Biological & Life Sciences, School of Arts & Sciences, Ahmedabad University Central Campus, Navrangpura Ahmedabad 380009 Gujarat India
| | - Helly Shah
- Biological & Life Sciences, School of Arts & Sciences, Ahmedabad University Central Campus, Navrangpura Ahmedabad 380009 Gujarat India
| | - Ruchi Rathod
- Biological & Life Sciences, School of Arts & Sciences, Ahmedabad University Central Campus, Navrangpura Ahmedabad 380009 Gujarat India
| | - Drishti Valecha
- Biological & Life Sciences, School of Arts & Sciences, Ahmedabad University Central Campus, Navrangpura Ahmedabad 380009 Gujarat India
| | - Saurabh Gogisetty
- Biological & Life Sciences, School of Arts & Sciences, Ahmedabad University Central Campus, Navrangpura Ahmedabad 380009 Gujarat India
| | - Pankti Joshi
- Biological & Life Sciences, School of Arts & Sciences, Ahmedabad University Central Campus, Navrangpura Ahmedabad 380009 Gujarat India
| | - Ashutosh Kumar
- Biological & Life Sciences, School of Arts & Sciences, Ahmedabad University Central Campus, Navrangpura Ahmedabad 380009 Gujarat India
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Shakiba S, Hakimian A, Barco LR, Louie SM. Dynamic Intermolecular Interactions Control Adsorption from Mixtures of Natural Organic Matter and Protein onto Titanium Dioxide Nanoparticles. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:14158-14168. [PMID: 30462496 DOI: 10.1021/acs.est.8b04014] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Engineered nanoparticles (NPs) will obtain macromolecular coatings in environmental systems, changing their subsequent interactions. The matrix complexity inherent in natural waters and wastewaters greatly complicates prediction of the corona formation. Here, we investigate corona formation on titanium dioxide (TiO2) NPs from mixtures of natural organic matter (NOM) and a protein, bovine serum albumin (BSA), to thoroughly probe the role of mixture interactions in the adsorption process. Fundamentally different coronas were observed under different NP exposure conditions and time scales. In mixtures of NOM and protein, the corona composition was kinetically determined, and the species initially coadsorbed but were ultimately limited to monolayers. On the contrary, sequential exposure of the NPs to pure solutions of NOM and protein resulted in extensive multilayer formation. The intermolecular complexation between NOM and BSA in solution and at the NP surface was the key mechanism controlling these distinctive adsorption behaviors, as determined by size exclusion chromatography (SEC) and in situ attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy. Overall, this study demonstrates that dynamic intermolecular interactions and the history of the NP surface must be considered together to predict corona formation on NPs in complex environmental media.
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Affiliation(s)
- Sheyda Shakiba
- Department of Civil and Environmental Engineering , University of Houston , Houston , Texas 77204 , United States
| | - Alireza Hakimian
- Department of Civil and Environmental Engineering , University of Houston , Houston , Texas 77204 , United States
| | - Luis R Barco
- Department of Civil and Environmental Engineering , University of Houston , Houston , Texas 77204 , United States
| | - Stacey M Louie
- Department of Civil and Environmental Engineering , University of Houston , Houston , Texas 77204 , United States
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17
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Xie B, Jiang Y, Zhang Z, Cao G, Sun H, Wang N, Wang S. Co-transport of Pb (II) and Cd (II) in saturated porous media: effects of colloids, flow rate and grain size. CHEMICAL SPECIATION & BIOAVAILABILITY 2018. [DOI: 10.1080/09542299.2018.1531727] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Bingyi Xie
- College of Natural Resources and Environment, Northwest A&F University, Yangling, China
| | - Yanji Jiang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, China
| | - Zhe Zhang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, China
| | - Gang Cao
- College of Natural Resources and Environment, Northwest A&F University, Yangling, China
| | - Huimin Sun
- College of Natural Resources and Environment, Northwest A&F University, Yangling, China
- Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, China
| | - Nong Wang
- Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin, China
| | - Shengsen Wang
- School of Environmental Science and Engineering, Yangzhou University, Yangzhou, China
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18
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Fan M, Wang Y, Xue N, Zhao Y, Wang Z, Wang M, Zhao Y, Gao B. Coagulation of TiO2 nanoparticles-natural organic matter composite contaminants in various aquatic media: Fluorescence characteristics, flocs properties and membrane fouling abilities. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2018.05.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Liu Q, Li H, Jin G, Zheng K, Wang L. Assessing the influence of humic acids on the weathering of galena and its environmental implications. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 158:230-238. [PMID: 29709760 DOI: 10.1016/j.ecoenv.2018.04.030] [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: 01/30/2018] [Revised: 04/14/2018] [Accepted: 04/17/2018] [Indexed: 06/08/2023]
Abstract
Galena weathering often occurs in nature and releases metal ions during the process. Humic acid (HA), a critical particle of natural organic matter, binds metal ions, thus affecting metal transfer and transformation. In this work, an electrochemical method combined with spectroscopic techniques was adopted to investigate the interfacial processes involved in galena weathering under acidic and alkaline conditions, as well as in the presence of HA. The results show that the initial step of galena weathering involved the transformation Pb2+ and S°, regardless of whether the solution was acidic or alkaline. Under acidic conditions, S° and Pb2+ further transform into anglesite, and HA adsorbs on the galena surface, inhibiting the transformation of sulfur. HA and Pb (II) ions form bridging complexes. Under alkaline conditions without HA, the sulfur produced undergoes no transformation, whereas Pb2+ will transform into PbO. The presence of HA changes the galena weathering mechanism via ionization effect, and Pb2+ is ultimately converted into anglesite. Higher acidity in acidic conditions or higher alkalinity in alkaline conditions causes galena corrosion when the electrolyte does not contain HA. Conversely, higher pH always accelerates galena corrosion when the electrolyte contains HA, whether the electrolyte is acidic or alkaline. At the same acidity/alkalinity, increasing the concentration of HA inhibits galena weathering. Galena will release 134.7 g m-2·y-1 Pb2+ to solution at pH 2.5, and the amount decreases to 28.09 g m-2·y-1 in the presence of 1000 mg/L HA. This study provides an in situ electrochemical method for the assessment of galena weathering.
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Affiliation(s)
- Qingyou Liu
- Key Laboratory of High-Temperature and High-Pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Heping Li
- Key Laboratory of High-Temperature and High-Pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.
| | - Guoheng Jin
- Key Laboratory of High-Temperature and High-Pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; University of Chinese Academy of Sciences, Beijing 100039, China
| | - Kai Zheng
- Key Laboratory of High-Temperature and High-Pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; University of Chinese Academy of Sciences, Beijing 100039, China
| | - Luying Wang
- Key Laboratory of High-Temperature and High-Pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; University of Chinese Academy of Sciences, Beijing 100039, China
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20
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Castro VL, Clemente Z, Jonsson C, Silva M, Vallim JH, de Medeiros AMZ, Martinez DST. Nanoecotoxicity assessment of graphene oxide and its relationship with humic acid. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2018; 37:1998-2012. [PMID: 29608220 DOI: 10.1002/etc.4145] [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: 08/07/2017] [Revised: 10/02/2017] [Accepted: 03/29/2018] [Indexed: 06/08/2023]
Abstract
The risk assessment of nanomaterials is essential for regulatory purposes and for sustainable nanotechnological development. Although the application of graphene oxide has been widely exploited, its environmental risk is not well understood because several environmental conditions can affect its behavior and toxicity. In the present study, the graphene oxide effect from aquatic ecosystems was assessed considering the interaction with humic acid on 9 organisms: Raphidocelis subcapitata (green algae), Lemna minor (aquatic plant), Lactuca sativa (lettuce), Daphnia magna (planktonic microcrustacean), Artemia salina (brine shrimp), Chironomus sancticaroli (Chironomidae), Hydra attenuata (freshwater polyp), and Caenorhabditis elegans and Panagrolaimus sp. (nematodes). The no-observed-effect concentration (NOEC) was calculated for each organism. The different criteria used to calculate NOEC values were transformed and plotted as a log-logistic function. The hypothetical 5 to 50% hazardous concentration values were, respectively, 0.023 (0.005-0.056) and 0.10 (0.031-0.31) mg L-1 for graphene oxide with and without humic acid, respectively. The safest scenario associated with the predicted no-effect concentration values for graphene oxide in the aquatic compartment were estimated as 20 to 100 μg L-1 (in the absence of humic acid) and 5 to 23 μg L-1 (in the presence of humic acid). Finally, the present approach contributed to the risk assessment of graphene oxide-based nanomaterials and the establishment of nano-regulations. Environ Toxicol Chem 2018;37:1998-2012. © 2018 SETAC.
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Affiliation(s)
- Vera L Castro
- Laboratory of Ecotoxicology and Biosafety, Embrapa Environment, Jaguariúna, São Paulo, Brazil
- Center for Nuclear Energy in Agriculture (CENA), University of São Paulo (USP), Piracicaba, São Paulo, Brazil
| | - Zaira Clemente
- Laboratory of Ecotoxicology and Biosafety, Embrapa Environment, Jaguariúna, São Paulo, Brazil
- Brazilian National Nanotechnology Laboratory (LNNano), Brazilian Center for Research on Energy and Materials (CNPEM), Campinas, São Paulo, Brazil
| | - Claudio Jonsson
- Laboratory of Ecotoxicology and Biosafety, Embrapa Environment, Jaguariúna, São Paulo, Brazil
| | - Mariana Silva
- Laboratory of Aquatic Ecosystems, Embrapa Environment, Jaguariúna, São Paulo, Brazil
| | - José Henrique Vallim
- Laboratory of Ecotoxicology and Biosafety, Embrapa Environment, Jaguariúna, São Paulo, Brazil
| | - Aline Maria Zigiotto de Medeiros
- Center for Nuclear Energy in Agriculture (CENA), University of São Paulo (USP), Piracicaba, São Paulo, Brazil
- Brazilian National Nanotechnology Laboratory (LNNano), Brazilian Center for Research on Energy and Materials (CNPEM), Campinas, São Paulo, Brazil
| | - Diego Stéfani T Martinez
- Center for Nuclear Energy in Agriculture (CENA), University of São Paulo (USP), Piracicaba, São Paulo, Brazil
- Brazilian National Nanotechnology Laboratory (LNNano), Brazilian Center for Research on Energy and Materials (CNPEM), Campinas, São Paulo, Brazil
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Ren M, Horn H, Frimmel FH. Aggregation behavior of TiO 2 nanoparticles in municipal effluent: Influence of ionic strengthen and organic compounds. WATER RESEARCH 2017; 123:678-686. [PMID: 28710984 DOI: 10.1016/j.watres.2017.07.021] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2017] [Revised: 06/20/2017] [Accepted: 07/10/2017] [Indexed: 06/07/2023]
Abstract
The influence of ionic strengthen and dissolved organic matter (DOM) on the aggregation of TiO2 nanoparticles (NPs) in municipal effluent was investigated. The results demonstrated that DOM promoted the mobility of NPs in aquatic system by synergism between static repulsion and steric effect, while electrolytes were opposite by charge-neutralization. The physical-chemical characteristics of DOM played the major role on the mobility of NPs. Bovine serum albumin (BSA) showed the strongest enhancement on the mobility of TiO2 NPs. High adsorption of BSA introduced vast negative charges on the TiO2 NPs' surface, leading to static repulsion and neutralizing positive charges of electrolytes in surrounding as well. By contrast, another protein α-amylase retarded the aggregation rate of TiO2 NPs through steric repulsion of the long-chain construction. Humic substances (Fulvic acid and alginate) also reflected the combination of static repulsion and steric effect. However, in the high electrolytes concentration (especially Ca2+), the long-chain aliphatic compounds were prone to form calcium bridge which increased the hydrodynamic diameter of TiO2 aggregates consequently. Sodium dodecylbenzene sulfonate (SDBS) showed low adsorption capacity, while the unabsorbed SDBS retarded the aggregates caused by the changes of pH and electrolytes. These data indicated that decreasing of DOC concentration in aqueous system was important to reduce the mobility and potential risk of NPs in aqueous system.
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Affiliation(s)
- Meijie Ren
- Chair of Water Chemistry and Water Technology, Karlsruhe Institute of Technology, Engler-Bunte-Ring 1, 76131, Karlsruhe, Germany; Institute of Materials, China Academy of Physics Engineering, Mianyang 621907, Sichuan, PR China.
| | - Harald Horn
- Chair of Water Chemistry and Water Technology, Karlsruhe Institute of Technology, Engler-Bunte-Ring 1, 76131, Karlsruhe, Germany
| | - Fritz H Frimmel
- Chair of Water Chemistry and Water Technology, Karlsruhe Institute of Technology, Engler-Bunte-Ring 1, 76131, Karlsruhe, Germany
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22
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Wang L, Lu Y, Yang C, Chen C, Huang W, Dang Z. Effects of Cd(II) on the stability of humic acid-coated nano-TiO 2 particles in aquatic environments. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:23144-23152. [PMID: 28828557 DOI: 10.1007/s11356-017-9905-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2017] [Accepted: 08/03/2017] [Indexed: 06/07/2023]
Abstract
The stability of nanoparticles (NPs) in aquatic environments is important to evaluate their adverse effects on aquatic ecosystems and human health. Nanoparticle stability is known to be influenced by coexisting ions and dissolved organic matter. This study was designed to investigate the effects of coexisting low-level Cd(II) on the stability of humic acid-coated nano-TiO2 (HA-TiO2) particles in aquatic environments by measuring their aggregation kinetics through time-resolved dynamic light scattering (DLS) and monitoring suspended HA-TiO2 concentrations via optical absorbance changes over time. The particles exhibited aggregation behavior consistent with the classic Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The results showed that Cd(II) concentration, pH, and ionic strength had various effects on the aggregation kinetics of the HA-TiO2 NPs. The HA-TiO2 particles aggregated faster as the Cd(II) concentration increased whereas the stability of the nanoparticles increased as the solution pH increased or ionic strength decreased regardless of the Cd(II) concentration. At the fixed pH and ionic strength conditions, the addition of Cd(II) promoted aggregation of nanoparticles, leading to higher attachment efficiencies. The enhanced aggregation of the HA-TiO2 NPs in the presence of coexisting cadmium ions in aqueous solutions indicated that the fate and transport of nanoparticles could be greatly affected by heavy metals in aquatic environments.
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Affiliation(s)
- Li Wang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Yixin Lu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Chen Yang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
| | - Chengyu Chen
- Department of Environmental Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ, 08901, USA
| | - Weilin Huang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
- Department of Environmental Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ, 08901, USA
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
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Lin D, Story SD, Walker SL, Huang Q, Liang W, Cai P. Role of pH and ionic strength in the aggregation of TiO 2 nanoparticles in the presence of extracellular polymeric substances from Bacillus subtilis. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 228:35-42. [PMID: 28511037 DOI: 10.1016/j.envpol.2017.05.025] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 05/05/2017] [Accepted: 05/08/2017] [Indexed: 06/07/2023]
Abstract
Increased use of commercial titanium dioxide nanoparticles (TiO2 NPs) in consumer products most likely leads to their additional environmental release. Aggregation and disaggregation processes are expected to play an important role in the fate and transport of TiO2 NPs in natural aquatic ecosystems. Therefore, in this work, we have studied the colloidal stability of TiO2 NPs in the presence of extracellular polymeric substances (EPS) from Bacillus subtilis and the adsorption behavior of EPS on TiO2 NPs in aqueous solutions at different pH values and ionic strengths (IS). The adsorption and aggregation processes were found to depend on the solution chemistry. The mass fraction of EPS on TiO2 NPs decreased with increased pH and NaCl concentrations, which was verified by Fourier transform infrared spectroscopy. The presence of EPS can substantially influence the colloidal stability of TiO2 NPs. In deionized water, the aggregation of NPs was induced by the addition of EPS only when the pH was below the TiO2 NP point of zero charge (≈6). When the pH was equal to pHPZC, TiO2, the TiO2 NPs would rapidly form large aggregates, but the adsorption of EPS leads to partial fragmentation via electrostatic repulsion and steric hindrance. When the pH was greater than pHPZC, TiO2, the aggregation rate was minimally affected by the increased EPS concentration. In NaCl solution, the aggregation rate of TiO2 NPs obviously increased with increased NaCl concentration. The critical coagulation concentration (CCC) of TiO2 NPs is 13.9 mM in the absence of EPS and increases to 155.6, 213.7 and 316.4 mM in the presence of 1, 5 and 10 mg/L EPS in NaCl solution, respectively, which indicates that the steric hindrance occurs after the addition of EPS. This study suggests that environmental conditions and EPS concentration greatly modify the colloidal stability of TiO2 nanoparticles.
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Affiliation(s)
- Di Lin
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - S Drew Story
- Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA
| | - Sharon L Walker
- Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA
| | - Qiaoyun Huang
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Wei Liang
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Peng Cai
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
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24
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Clemente Z, Castro VLSS, Franqui LS, Silva CA, Martinez DST. Nanotoxicity of graphene oxide: Assessing the influence of oxidation debris in the presence of humic acid. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 225:118-128. [PMID: 28363143 DOI: 10.1016/j.envpol.2017.03.033] [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: 12/07/2016] [Revised: 03/01/2017] [Accepted: 03/15/2017] [Indexed: 05/27/2023]
Abstract
This study sought to evaluate the toxicological effects of graphene oxide (GO) through tests with Danio rerio (zebrafish) embryos, considering the influence of the base washing treatment and the interaction with natural organic matter (i.e., humic acid, HA). A commercial sample of GO was refluxed with NaOH to remove oxidation debris (OD) byproducts, which resulted in a base washed GO sample (bw-GO). This process decreased the total oxygenated groups in bw-GO and its stability in water compared to GO. When tested in the presence of HA, both GO and bw-GO stabilities were enhanced in water. Although the embryo exposure showed no acute toxicity or malformation, the larvae exposed to GO showed a reduction in their overall length and acetylcholinesterase activity. In the presence of HA, GO also inhibited acid phosphatase activity. Our findings indicate a mitigation of material toxicity after OD removal. The difference in the biological effects may be related to the materials' bioavailability and biophysicochemical interactions. This study reports for the first time the critical influence of OD on the GO material biological reactivity and HA interaction, providing new data for nanomaterial environmental risk assessment and sustainable nanotechnology.
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Affiliation(s)
- Zaira Clemente
- Laboratory of Ecotoxicology and Biosafety, Brazilian Agricultural Research Corporation (Embrapa Environment), Jaguariúna, SP, Brazil; Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP, Brazil.
| | - Vera Lúcia S S Castro
- Laboratory of Ecotoxicology and Biosafety, Brazilian Agricultural Research Corporation (Embrapa Environment), Jaguariúna, SP, Brazil
| | - Lidiane S Franqui
- Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP, Brazil
| | - Cristiane A Silva
- Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP, Brazil
| | - Diego Stéfani T Martinez
- Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP, Brazil
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25
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Miao Y, Guo X, Fan T, Yang C. Rates and equilibria of perfluorooctanoate (PFOA) sorption on soils from different regions of China. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2017; 139:102-108. [PMID: 28113113 DOI: 10.1016/j.ecoenv.2017.01.022] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Revised: 01/11/2017] [Accepted: 01/12/2017] [Indexed: 06/06/2023]
Abstract
Understanding sorption of PFOA on soil particles is crucial to evaluate its environmental risk. Here, sorption of PFOA onto ten agricultural soils was examined. The influence of soil physico-chemical properties on PFOA sorption was investigated. The sorption rate of PFOA followed a pseudo-second-order kinetics. Isotherm data of PFOA sorption was fitted with both Freundlich and linear models and the latter fitted better. The sorption-desorption of PFOA onto ten soil samples depended on soil organic carbon content and composition of soil minerals. The sorption and desorption isotherms of PFOA on ten soils were linear, except for the sorption of PFOA onto a few soils, which was described by the Freundlich equation with the parameter N >1. The main sorption mechanism of PFOA was hydrophobic interaction between the perfluorinated carbon chain and the organic matter of soil, as evidenced by the correlation between the solid-liquid distribution coefficient and the fraction of soil organic carbon. The sorption of PFOA in soils was highly irreversible.
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Affiliation(s)
- Yu Miao
- School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
| | - Xuetao Guo
- School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), Guangzhou 510006, China.
| | - Tingyu Fan
- School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
| | - Chen Yang
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (SCUT), Guangzhou 510006, China
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26
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Simelane S, Ngila JC, Dlamini LN. The effect of humic acid on the stability and aggregation kinetics of WO3 nanoparticles. PARTICULATE SCIENCE AND TECHNOLOGY 2017. [DOI: 10.1080/02726351.2017.1302536] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- S. Simelane
- Department of Applied Chemistry, University of Johannesburg, Doornfontein, Johannesburg, South Africa
| | - J. C. Ngila
- Department of Applied Chemistry, University of Johannesburg, Doornfontein, Johannesburg, South Africa
| | - L. N. Dlamini
- Department of Applied Chemistry, University of Johannesburg, Doornfontein, Johannesburg, South Africa
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27
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Lin D, Drew Story S, Walker SL, Huang Q, Cai P. Influence of extracellular polymeric substances on the aggregation kinetics of TiO 2 nanoparticles. WATER RESEARCH 2016; 104:381-388. [PMID: 27576157 DOI: 10.1016/j.watres.2016.08.044] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 08/11/2016] [Accepted: 08/21/2016] [Indexed: 06/06/2023]
Abstract
The early stage of aggregation of titanium oxide (TiO2) nanoparticles was investigated in the presence of extracellular polymeric substance (EPS) constituents and common monovalent and divalent electrolytes through time-resolved dynamic light scattering (DLS). The hydrodynamic diameter was measured and the subsequent aggregation kinetics and attachment efficiencies were calculated across a range of 1-500 mM NaCl and 0.05-40 mM CaCl2 solutions. TiO2 particles were significantly aggregated in the tested range of monovalent and divalent electrolyte concentrations. The aggregation behavior of TiO2 particles in electrolyte solutions was in excellent agreement with the predictions based on Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Divalent electrolytes were more efficient in destabilizing TiO2 particles, as indicated by the considerably lower critical coagulation concentrations (CCC) (1.3 mM CaCl2 vs 11 mM NaCl). The addition of EPS to the NaCl and low concentration CaCl2 (0.05-10 mM) solutions resulted in a dramatic decrease in the aggregation rate and an increase in the CCC values. For solutions of 11 mM NaCl (the CCC values of TiO2 in the absence of EPS) and above, the resulting attachment efficiency was less than one, suggesting that the adsorbed EPS on the TiO2 nanoparticles led to steric repulsion, which effectively stabilized the nanoparticle suspension. At high CaCl2 concentrations (10-40 mM), however, the presence of EPS increased the aggregation rate. This is attributed to the aggregation of the dissolved extracellular polymeric macromolecules via intermolecular bridging, which in turn linked the TiO2 nanoparticles and aggregates together, resulting in enhanced aggregate growth. These results have important implications for assessing the fate and transport of TiO2 nanomaterials released in aquatic environments.
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Affiliation(s)
- Di Lin
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - S Drew Story
- Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA
| | - Sharon L Walker
- Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA
| | - Qiaoyun Huang
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
| | - Peng Cai
- State Key Laboratory of Agricultural Microbiology, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
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28
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Du X, Qu F, Liang H, Li K, Chang H, Li G. Cake properties in ultrafiltration of TiO2 fine particles combined with HA: in situ measurement of cake thickness by fluid dynamic gauging and CFD calculation of imposed shear stress for cake controlling. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:8806-8818. [PMID: 26810663 DOI: 10.1007/s11356-015-5984-3] [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: 06/05/2015] [Accepted: 12/14/2015] [Indexed: 06/05/2023]
Abstract
In this study, the cake buildup of TiO2 fine particles in the presence of humid acid (HA) and cake layer controlling during ultrafiltration (UF) were investigated. Specifically, we measured the cake thickness using fluid dynamic gauging (FDG) method under various solution conditions, including TiO2 concentration (0.1-0.5 g/L), HA concentration (0-5 mg/L, total organic carbon (TOC)), and pH values (e.g., 4, 6 and 10), and calculated the shear stress distribution induced by stirring using computational fluid dynamics (CFD) to analyze the cake layer controlling conditions, including the operation flux (50-200 L m(-2) h(-1)) and TiO2 concentration (0.1-0.5 g/L). It was found that lower TiO2/HA concentration ratio could lead to exceedingly severe membrane fouling because of the formation of a relatively denser cake layer by filling the voids of cake layer with HA, and pH was essential for cake layer formation owing to the net repulsion between particles. Additionally, it was observed that shear stress was rewarding for mitigating cake growth under lower operation flux as a result of sufficient back-transport forces, and exhibited an excellent performance on cake layer controlling in lower TiO2 concentrations due to slight interaction forces on the vicinity of membrane.
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Affiliation(s)
- Xing Du
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, People's Republic of China
| | - Fangshu Qu
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, People's Republic of China
| | - Heng Liang
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, People's Republic of China.
| | - Kai Li
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, 13 Yanta Road, Xi'an, 710055, People's Republic of China
| | - Haiqing Chang
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, People's Republic of China
| | - Guibai Li
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, People's Republic of China
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29
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Du X, Wang X, You S, Wang Q, Gong X. A case study of aggregation behaviors of titanium dioxide nanoparticles in the presence of dodecylbenzene sulfonate in natural water. J Environ Sci (China) 2015; 36:84-92. [PMID: 26456610 DOI: 10.1016/j.jes.2015.05.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Revised: 05/14/2015] [Accepted: 05/15/2015] [Indexed: 06/05/2023]
Abstract
The present work aims to ascertain the mechanisms of surfactant (dodecylbenzene sulfonate; DBS) effects on the aggregation behaviors of TiO2 nanoparticles (TiO2-NPs) in natural water samples. Aggregation experiments were conducted at a TiO2-NPs concentration of 10mg/L in deionized water and in natural water samples via dynamic light scattering and Zeta potential determination. Average attachment efficiency was calculated to compare the aggregation behaviors of nanoparticles in the two aqueous media. Results showed that the effects of DBS on aggregation could be interpreted by both Derjaguin-Landau-Verwey-Overbeek (DLVO) and non-DLVO mechanisms. In natural water samples, aggregation did not occur rapidly and was able to develop slowly under all conditions, and the roles of DBS were obvious at high DBS concentration owing to the impacts of inherent components of natural water samples, such as colloids and natural organic compounds. Future aggregation studies should concentrate on multi-factor, multi-colloidal and dynamic aspects under similar environmental conditions.
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Affiliation(s)
- Xin Du
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
| | - Xiuheng Wang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
| | - Shijie You
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Qiuru Wang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Xiaobo Gong
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
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30
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Dong H, Zeng G, Tang L, Fan C, Zhang C, He X, He Y. An overview on limitations of TiO2-based particles for photocatalytic degradation of organic pollutants and the corresponding countermeasures. WATER RESEARCH 2015; 79:128-46. [PMID: 25980914 DOI: 10.1016/j.watres.2015.04.038] [Citation(s) in RCA: 462] [Impact Index Per Article: 51.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Revised: 04/22/2015] [Accepted: 04/24/2015] [Indexed: 05/23/2023]
Abstract
The pollutants classified as "persistent organic pollutants (POPs)", are being subject to high concern among the scientific community due to their persistence in the environment. TiO2-based photocatalytic process has shown a great potential as a low-cost, environmentally friendly and sustainable treatment technology to remove POPs in sewage to overcome the shortcomings of the conventional technologies. However, this technology suffers from some main technical barriers that impede its commercialization, i.e., the inefficient exploitation of visible light, low adsorption capacity for hydrophobic contaminants, uniform distribution in aqueous suspension and post-recovery of the TiO2 particles after water treatment. To improve the photocatalytic efficiency of TiO2, many studies have been carried out with the aim of eliminating the limitations mentioned above. This review summarizes the recently developed countermeasures for improving the performance of TiO2-based photocatalytic degradation of organic pollutants with respect to the visible-light photocatalytic activity, adsorption capacity, stability and separability. The performance of various TiO2-based photocatalytic processes for POPs degradation and the underlying mechanisms were summarized and discussed. The future research needs for TiO2-based technology are suggested accordingly. This review will significantly improve our understanding of the process of photocatalytic degradation of POPs by TiO2-based particles and provide useful information to scientists and engineers who work in this field.
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Affiliation(s)
- Haoran Dong
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China.
| | - Guangming Zeng
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China
| | - Lin Tang
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China
| | - Changzheng Fan
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China
| | - Chang Zhang
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China
| | - Xiaoxiao He
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China
| | - Yan He
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China
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31
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Guo X, Zhang J, Ge J, Yang C, Dang Z, Liu S, Gao L. Sorption and photodegradation of tylosin and sulfamethazine by humic acid-coated goethite. RSC Adv 2015. [DOI: 10.1039/c5ra17587a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Humic acid and mineral oxides are simultaneously present in soils and can form organomineral complexes.
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Affiliation(s)
- Xuetao Guo
- School of Earth and Environment
- Anhui University of Science and Technology
- Huainan 232001, China
| | - Jing Zhang
- School of Earth and Environment
- Anhui University of Science and Technology
- Huainan 232001, China
| | - Jianhua Ge
- School of Earth and Environment
- Anhui University of Science and Technology
- Huainan 232001, China
| | - Chen Yang
- College of Environment and Energy
- South China University of Technology
- Guangzhou, China
| | - Zhi Dang
- College of Environment and Energy
- South China University of Technology
- Guangzhou, China
| | - Shaomin Liu
- School of Earth and Environment
- Anhui University of Science and Technology
- Huainan 232001, China
| | - Liangmin Gao
- School of Earth and Environment
- Anhui University of Science and Technology
- Huainan 232001, China
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