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Zhang H, Zhang S, Liu Y, Yang M, Zhou X, Abbas G, Wang L, Lu J. Effects of chloride on corrosion scale compositions and heavy metal release in drinking water distribution systems. J Hazard Mater 2024; 465:133452. [PMID: 38198869 DOI: 10.1016/j.jhazmat.2024.133452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 12/16/2023] [Accepted: 01/03/2024] [Indexed: 01/12/2024]
Abstract
Variations in water chemistry may lead to the release of harmful heavy metals in drinking water distribution systems (DWDSs). In this study, the effects of chloride on the release of heavy metals such as Fe, Mn, As, Cr, Mo, V, Sr, and Co were examined using steel and cast iron pipe loops. After chloride was added, the relative contents of goethite (α-FeOOH), lepidocrocite (γ-FeOOH), and siderite (FeCO3) in pipe scales increased, but the contents of magnetite (Fe3O4) decreased. The most prevalent compounds were α-FeOOH and γ-FeOOH. When the chloride levels were increased, the effluent concentrations of Fe, Mn, As, Cr, Mo, V, Sr, and Co significantly increased. These heavy metals were released presumably because of the destabilization and dissolution of corrosion scales induced by chloride and adsorption site competition. Strong positive correlations were also observed between Fe&Mn, Fe/Mn&As, Fe/Mn&Cr, Fe/Mn&Mo, Fe/Mn&V, Fe/Mn&Sr, and Fe/Mn&Co, indicating the co-release of Fe, Mn, and other metals. This study may be helpful for the potential strategies on avoidance of heavy metal release and improvement of water supply security.
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Affiliation(s)
- Hui Zhang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Shan Zhang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Yuekai Liu
- Qingdao Municiple Engineering Design & Research Institute, Qingdao 266000, PR China
| | - Min Yang
- China Northwest Architecture Design and Research Institute Co. Ltd, Xi'an 710018, PR China
| | - Xue Zhou
- Shenzhen Water Resources Planning and Design Institute Co., Ltd, Shenzhen 518000, PR China
| | - Ghulam Abbas
- Department of Chemical Engineering and Technology, University of Gujrat, Gujrat 50700, Pakistan
| | - Long Wang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Jinsuo Lu
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China.
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2
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Barreto MSC, Elzinga EJ, Kubicki JD, Sparks DL. A multi-scale assessment of the impact of salinity on the desorption of chromate from hematite: Sea level rise implications. J Hazard Mater 2024; 465:133041. [PMID: 38043423 DOI: 10.1016/j.jhazmat.2023.133041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 11/08/2023] [Accepted: 11/17/2023] [Indexed: 12/05/2023]
Abstract
The solubility and transport of Cr(VI) is primarily controlled by adsorption-desorption reactions at the surfaces of soil minerals such as iron oxides. Environmental properties such as pH, ionic strength, and ion competition are expected to affect the mobility and fate of Cr(VI). Sea level rise (SLR), and consequent seawater intrusion, is creating a new biogeochemical soil environment at coastal margins, potentially impacting Cr(VI) retention at contaminated sites. We employed in-situ ATR-FTIR spectroscopy and DFT calculations to investigate at the molecular level the adsorption of Cr(VI) on the hematite surface and its desorption by sulfate, as a function of pH and ionic strength. We further used a batch experiment to assess Cr(VI) desorption at varying artificial seawater (ASW) concentrations. IR results demonstrate the complexity of Cr(VI) adsorption, showing a combination of monodentate inner-sphere complexation at high pH and dichromate outer-sphere (∼75%) at low pH. The Cr(VI)-complexes exhibited desorption induced by increasing pH values (58% of desorption) and sulfate competition (∼40% desorption). ASW desorbed ∼20% more Cr(VI), even at just 1% concentration. Our findings provide insight into Cr(VI)-adsorption complexation that controls the retention and remobilization of Cr(VI) on Fe-oxide minerals. The results point to an elevated risk of Cr(VI) mobilization in contaminated soils affected by SLR.
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Affiliation(s)
| | - Evert J Elzinga
- Department of Earth & Environmental Sciences, Rutgers University, Newark, NJ, USA
| | - James D Kubicki
- Department of Earth, Environmental & Resource Sciences, The University of Texas at El Paso, El Paso, TX, USA
| | - Donald L Sparks
- Department of Plant & Soil Sciences, University of Delaware, Newark, DE, USA
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3
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Fan W, Yan S, Gao B, Xiu W, Zhao Y, Guo H. Linking groundwater microbiome and functional ecological clusters to geogenic high hexavalent chromium from deep aquifers in a loess plateau. Water Res 2023; 244:120545. [PMID: 37659182 DOI: 10.1016/j.watres.2023.120545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 08/09/2023] [Accepted: 08/28/2023] [Indexed: 09/04/2023]
Abstract
Geogenic high hexavalent chromium [Cr(Ⅵ)] in groundwater is a global environmental problem. However, the groundwater microbiome and its linkage to geogenic high Cr(Ⅵ) from deep aquifers still need to be elucidated. Here, we evaluated geogenic Cr(Ⅵ), groundwater microbiome with featured functional ecological clusters and their interactive responses in groundwater from a deep aquifer in a loess plateau of Northern Shaanxi, China. We found that the compositions and structures of microbial communities in groundwater from the deep aquifer were significantly different between low Cr(Ⅵ) (LCG, < 50 μg/L) and high Cr(Ⅵ) groundwater (HCG, > 50 μg/L), with higher microbial diversity and richness in HCG (p < 0.05). Functional "specialists" related to Cr biotransformation, including Cr(Ⅵ) reducing bacteria (CRB) Rhodococcus, Nocardioides, Novosphingobium, and Acidovorax and Mn-oxidizing bacteria (MnOB) Sphingobium, and Ralstonia were positively correlated to total Cr and Cr(VI) concentrations in groundwater. Moreover, these CRB and MnOB were dominant in high Cr(VI) groundwater and associated by strong interspecific relation in an ecological cluster (p < 0.05), suggesting their indicator roles for high Cr(Ⅵ) and the contribution of MnOB mediated Cr(III) oxidation to Cr(VI) enrichment. RDA and path analysis further revealed that the geogenic Cr(Ⅵ) directly promoted the key Cr-related functional cluster with the groundwater depth, dissolved oxygen, and total dissolved solids as the cofactors indirectly influencing Cr(Ⅵ) and the functional clusters (p < 0.05). Collectively, our results highlight the significant roles of microbial ecological clusters especially functional "specialists" MnOB and CRB in groundwater Cr(Ⅵ) from deep aquifers in the loess plateau and provide a basis for sustainable management of high Cr(Ⅵ) groundwater.
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Affiliation(s)
- Wendi Fan
- Key Laboratory of Groundwater Conservation of MWR & School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Beijing 100083, PR China
| | - Song Yan
- Key Laboratory of Groundwater Conservation of MWR & School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Beijing 100083, PR China
| | - Bingying Gao
- Key Laboratory of Groundwater Conservation of MWR & School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Beijing 100083, PR China
| | - Wei Xiu
- State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Beijing 100083, PR China; Institute of Earth Science, China University of Geosciences (Beijing), Beijing 100083, PR China
| | - Yi Zhao
- Key Laboratory of Groundwater Conservation of MWR & School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Beijing 100083, PR China.
| | - Huaming Guo
- Key Laboratory of Groundwater Conservation of MWR & School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, PR China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Beijing 100083, PR China.
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4
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Prakash V, Kumari K, Ramakrishnan V. Efficient Biosorption of Hexavalent Chromium from Water with Human Hair. ACS Omega 2023; 8:915-924. [PMID: 36643437 PMCID: PMC9835515 DOI: 10.1021/acsomega.2c06268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 11/30/2022] [Indexed: 06/17/2023]
Abstract
The triphenyl group (trityl radical) possessing three-phenyl rings, self-assembled through aromatic π-π stacking interactions, can form interesting crystalline organic nano-flowers. In this work, we have synthesized a hybrid material of 1,2-bis(tritylthio)ethane and magnetite, which reduces toxic Cr(VI) to non-toxic Cr(III). We validated the efficacy of the hybrid in reducing toxic Cr(VI) along with three other adsorbent systems. Among the five adsorbent systems tested, we observed that human hair has higher Cr removal efficiency, which prompted us to explore further using different mechanical forms of human hair. Pulverized hair (PH), hair powder (HP), and raw hair (RH) were evaluated by employing different reaction factors such as the adsorbent dose, pH, initial Cr(VI) concentration, and contact time. The comparative evaluation showed that PH has greater adsorption capacity (15.14 mg/g), followed by RH (13.27 mg/g) and HP (10.5 mg/g). While investigating the adsorption mechanism, we observed that it follows pseudo-second-order kinetics suggesting chemisorption. The Freundlich isotherm model fitted well for Cr(VI) adsorption by human hair, suggesting a multi-layered adsorption process. Overall, this study promises a cost-effective and eco-friendly bio-adsorbent for Cr(VI), which may be scaled up to design automated industrial waste disposal systems.
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Queirós JM, Salazar H, Valverde A, Botelho G, Fernández de Luis R, Teixeira J, Martins PM, Lanceros-Mendez S. Reusable composite membranes for highly efficient chromium removal from real water matrixes. Chemosphere 2022; 307:135922. [PMID: 35940413 DOI: 10.1016/j.chemosphere.2022.135922] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 07/29/2022] [Accepted: 07/30/2022] [Indexed: 06/15/2023]
Abstract
Natural or industrial hexavalent chromium water pollution continues to be a worldwide unresolved threat. Today, there is intense research on new active and cost-effective sorbents for Cr(VI), but most still exhibit a critical limitation: their powdered nature makes their recovery from water cost and energy consuming. In this work, Al(OH)3, MIL-88-B(Fe), and UiO-66-NH2 Cr(VI) sorbents were immobilized into a poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) polymeric substrate to develop an easily reactivable and reusable water filtering technology. The immobilization of the sorbents into the PVDF-HFP porous matrix modified the macro and meso-porous structure of the polymeric matrix, tuning in parallel its wettability. Although a partial blocking of the Cr(VI) adsorptive capacity was observed for of Al(OH)3 and MIL-88-B(Fe) when immobilized into composite membranes, PVDF-HFP/UiO-66-NH2 filter (i) exceeded the full capacity of the non-immobilized sorbent to trap Cr(VI), (ii) could be reactivated and reusable, and (iii) it was fully functional when applied in real water effluents.
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Affiliation(s)
- J M Queirós
- Physics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057, Braga, Portugal; LaPMET - Laboratory of Physics for Materials and Emergent Technologies, University of Minho, 4710-057, Braga, Portugal; Centre of Molecular and Environmental Biology, University of Minho, 4710-057, Braga, Portugal
| | - H Salazar
- Physics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057, Braga, Portugal; LaPMET - Laboratory of Physics for Materials and Emergent Technologies, University of Minho, 4710-057, Braga, Portugal; Centre/Department of Chemistry, University of Minho, 4710-057, Braga, Portugal
| | - A Valverde
- BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940, Leioa, Spain
| | - G Botelho
- Centre/Department of Chemistry, University of Minho, 4710-057, Braga, Portugal
| | - R Fernández de Luis
- Centre/Department of Chemistry, University of Minho, 4710-057, Braga, Portugal.
| | - J Teixeira
- Physics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057, Braga, Portugal; LaPMET - Laboratory of Physics for Materials and Emergent Technologies, University of Minho, 4710-057, Braga, Portugal; Centre/Department of Chemistry, University of Minho, 4710-057, Braga, Portugal
| | - P M Martins
- Centre of Molecular and Environmental Biology, University of Minho, 4710-057, Braga, Portugal; IB-S - Institute for Research and Innovation on Bio-Sustainability, University of Minho, 4710-057, Braga, Portugal.
| | - S Lanceros-Mendez
- BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940, Leioa, Spain; IKERBASQUE, Basque Foundation for Science, 48009, Bilbao, Spain
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6
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Lemma E, Kiflie Z, Kassahun SK. Adsorption of Cr (VI) ion from aqueous solution on acrylamide – grafted starch (Coccinia abyssinicca) – PVA/PVP/chitosan/graphene oxide blended hydrogel: isotherms, kinetics, and thermodynamics studies. SEP SCI TECHNOL 2022. [DOI: 10.1080/01496395.2022.2106441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Endalu Lemma
- School of Chemical and Bio-Engineering, Environmental Engineering Chair, Addis Ababa Institute of Technology, Addis Ababa University, Addis Ababa, Ethiopia
| | - Zebene Kiflie
- School of Chemical and Bio-Engineering, Environmental Engineering Chair, Addis Ababa Institute of Technology, Addis Ababa University, Addis Ababa, Ethiopia
| | - Shimelis Kebede Kassahun
- School of Chemical and Bio-Engineering, Environmental Engineering Chair, Addis Ababa Institute of Technology, Addis Ababa University, Addis Ababa, Ethiopia
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Ryu JG, Kim Y. Mineral transformation and dissolution of jarosite coprecipitated with hazardous oxyanions and their mobility changes. J Hazard Mater 2022; 427:128283. [PMID: 35065839 DOI: 10.1016/j.jhazmat.2022.128283] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 01/11/2022] [Accepted: 01/12/2022] [Indexed: 06/14/2023]
Abstract
Jarosite coprecipitation with hazardous oxyanions can attenuate the concentrations of these elements in acid mine drainage. However, jarosite can be easily transformed to goethite with changes in geochemical conditions. Consequently, the released oxyanions can greatly affect environments. The changes in the mineralogy and mobility of five oxyanions, namely AsO4, SeO3, SeO4, MoO4, and CrO4, which were coprecipitated with jarosite, are investigated herein during the mineral transformation. Our results show that the oxyanion species and the pH values greatly affect the mineral transformation and dissolution rates of jarosite-containing oxyanions. The transformation and dissolution rates of the jarosite samples at pH 8 are noticeably higher than those at pH 4. The X-ray diffraction results show that the CrO4 and SeO4 jarosites are as effectively transformed to goethite as the jarosite without oxyanions, while the SeO3 and AsO4 jarosites are least transformed, resulting in different sulfate and oxyanion concentrations in the solution. The oxyanions in jarosite are the main controlling factor in the mineral transformation and dissolution rates. In acid mine drainage, although CrO4 is easily attenuated by the jarosite precipitation, it has the highest mobility during the goethite transformation. On the contrary, AsO4 shows the opposite case.
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Affiliation(s)
- Jae-Geun Ryu
- School of Earth System Sciences, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Yeongkyoo Kim
- School of Earth System Sciences, Kyungpook National University, Daegu 41566, Republic of Korea.
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8
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Tian Y, Yu T, Shen J, Zheng G, Li H, Zhao W. Cr release after Cr(III) and Cr(VI) enrichment from different layers of cast iron corrosion scales in drinking water distribution systems: the impact of pH, temperature, sulfate, and chloride. Environ Sci Pollut Res Int 2022; 29:18778-18792. [PMID: 34699006 DOI: 10.1007/s11356-021-15754-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Accepted: 07/28/2021] [Indexed: 06/13/2023]
Abstract
Chromium accumulated from source water and pipeline lining materials in corrosion scales could potentially be released into bulk water in drinking water distribution systems (DWDS). This study examined the influence of pH (pH 4, pH 5.5, pH 7, pH 8.5, pH 10), temperature (5 °C, 15 °C, 25 °C), sulfate (50 mg/L, 150 mg/L, 250 mg/L), and chloride (50 mg/L, 150 mg/L, 250 mg/L) on chromium accumulation and release between iron corrosion scale phase and the surrounding water phase. For the first time, the accumulation and release behaviors of chromium were assessed and compared in two distinct layers of iron corrosion scales based on the speciation distributions of heavy metals. Results showed that in the outer and inner layers of corrosion scales, chromium exhibited an almost similar trend but significant differences in quantity, with the outer layer accumulating less and releasing more. In particular, the average difference of chromium released after Cr(VI) enrichment from the outer and inner layers was 50.53 μg/L under the same conditions. Further studies conclusively showed that in Cr(VI) accumulation process, a portion of Cr(VI) would be reduced to Cr(III) by Fe(II) in iron corrosion scales. The mechanisms of chromium retention based on different iron (oxyhydr)oxides were discussed.
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Affiliation(s)
- Yimei Tian
- Department of Environmental Engineering, School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Tiantian Yu
- Department of Environmental Engineering, School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Jingyi Shen
- Department of Environmental Engineering, School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Guolei Zheng
- Department of Environmental Engineering, School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Han Li
- Department of Environmental Engineering, School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Weigao Zhao
- Department of Environmental Engineering, School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.
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Senamart N, Deekamwong K, Wittayakun J, Prayoonpokarach S, Chanlek N, Poo-arporn Y, Wannapaiboon S, Kidkhunthod P, Loiha S. Structural elucidation of hexavalent Cr adsorbed on surfaces and bulks of Fe 3O 4 and α-FeOOH. RSC Adv 2022; 12:25578-25586. [PMID: 36199300 PMCID: PMC9453572 DOI: 10.1039/d2ra03676b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 08/30/2022] [Indexed: 11/21/2022] Open
Abstract
Magnetite (Fe3O4) and goethite (α-FeOOH) were synthesized via a hydrothermal approach and utilized as adsorbents for Cr6+ removal in an aqueous medium. Cr3+ could migrate into bulk Fe3O4 and stabilize in form of a solid solution.
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Affiliation(s)
- Nichapha Senamart
- Center for Innovation in Chemistry (PERCH-CIC), Materials Chemistry Research Center, Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Krittanun Deekamwong
- School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
| | - Jatuporn Wittayakun
- School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
| | - Sanchai Prayoonpokarach
- School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
| | - Narong Chanlek
- Synchrotron Light Research Institute, Nakhon Ratchasima 30000, Thailand
| | | | | | - Pinit Kidkhunthod
- Synchrotron Light Research Institute, Nakhon Ratchasima 30000, Thailand
| | - Sirinuch Loiha
- Center for Innovation in Chemistry (PERCH-CIC), Materials Chemistry Research Center, Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
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Pires MS, Silva TC, Lacerda LC, de Castro AA, Corrêa S, de Oliveira IS, Vaiss VS, Nogueira FG, Ramalho TC. Doping effect of Cu (II) in the adsorption of CrO42- by the Fe3O4 (1 1 1) surface: A theoretical study. Chem Phys Lett 2021; 781:138984. [DOI: 10.1016/j.cplett.2021.138984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Liu L, Liu G, Zhou J, Jin R. Interaction between hexavalent chromium and biologically formed iron mineral-biochar composites: Kinetics, products and mechanisms. J Hazard Mater 2021; 405:124246. [PMID: 33097346 DOI: 10.1016/j.jhazmat.2020.124246] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 10/08/2020] [Accepted: 10/08/2020] [Indexed: 06/11/2023]
Abstract
Biogenic Fe(II) is a dominant natural reductant to convert carcinogenic Cr(VI) to less toxic Cr(III). Field-applied biochar could promote microbial production of Fe(II) and form iron-biochar composites. Although there have been mounting research on the interactions of biochar or Fe(II) with Cr(VI), their coupling effects on Cr(VI) immobilization have been largely neglected. Here, iron mineral-biochar composite (IMBC) was prepared via biochar-mediated dissimilatory reduction of ferrihydrite or goethite by Shewanella oneidensis MR-1, and its reaction with Cr(VI) was investigated. IMBC was able to effectively remove aqueous Cr(VI) via reductive transformation by adsorbed Fe(II). The removal process nicely followed pseudo-second-order kinetics and Langmuir isotherm model. The removal ability of IMBC decreased with increasing pH (5.5-8.0) but was independent of ionic strength changes (0-100 mM). After reaction, the Fe-Cr coprecipitates formed on IMBC exhibited slightly higher Fe/Cr ratios (0.93-0.96) than those on corresponding iron mineral controls (0.88-0.94). For IMBC, while the presence of biochar decreased the reactivity of adsorbed Fe(II), their removal capacities were ~30% higher than those of iron minerals alone, due to the enhanced yields of adsorbed Fe(II). These findings improved our knowledge of interactions among biochar, iron mineral and iron-reducing bacteria and their contribution to chromium immobilization.
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Affiliation(s)
- Lecheng Liu
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Guangfei Liu
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China; Key Laboratory of Eco-restoration of Regional Contaminated Environment, Shenyang University, Shenyang 110000, China.
| | - Jiti Zhou
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Ruofei Jin
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
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Eliopoulos ID, Eliopoulos GD, Economou-eliopoulos M. The Cr(VI) Stability in Contaminated Coastal Groundwater: Salinity as a Driving Force. Minerals 2021; 11:160. [DOI: 10.3390/min11020160] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Chromium concentrations in seawater are less than 0.5 μg/L, but the Cr(VI) in contaminated coastal groundwater affected by Cr-bearing rocks/ores and/or human activities, coupled with the intrusion of seawater may reach values of hundreds of μg/L. A potential explanation for the stability of the harmful Cr(VI) in contaminated coastal aquifers is still unexplored. The present study is an overview of new and literature data on the composition of coastal groundwater and seawater, aiming to provide potential relationships between Cr(VI) with major components in seawater and explain the elevated Cr(VI) concentrations. It is known that the oxidation of Cr(III) to Cr(VI) and the subsequent back-reduction of Cr(VI) processes, during the transport of the mobilized Cr(VI) in various aquifers, facilitate the natural attenuation process of Cr(VI). Moreover, the presented positive trend between B and Cr(VI) and negative trend between δ53Cr values and B concentration may suggest that seawater components significantly inhibit the Cr(VI) reduction into Cr(III), and provide insights on the role of the borate, [B(OH)4]− ions, a potential buffer, on the stability of Cr(VI) in coastal groundwater. Therefore, efforts are needed toward the prevention and/or minimization of the contamination by Cr(VI) of in coastal aquifers, which are influenced by the intrusion of seawater and are threatened by changes in sea level, due to climate change. The knowledge of the contamination sources, hotspots and monitoring of water salinization processes (geochemical mapping) for every coastal country may contribute to the optimization of agricultural management strategies.
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Lin X, Wei G, Liang X, Liu J, Ma L, Zhu J. The Competitive Adsorption of Chromate and Sulfate on Ni-Substituted Magnetite Surfaces: An ATR-FTIR Study. Minerals 2021; 11:88. [DOI: 10.3390/min11010088] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
With similar chemical properties and geometrical configurations, sulfate and chromate display interesting competitive adsorption on mineral surfaces. Although such issues have been investigated on several Fe (hydr)oxide surfaces, e.g., ferrihydrite, goethite and hematite, the competitive adsorption on magnetite surfaces and the constraint mechanism have seldom been studied. This impedes the understanding of the transfer and fate of chromate and sulfate on magnetite surfaces, as magnetite is not only a useful adsorbent but also an efficient reductant to decrease the mobility and toxicity of chromium. In the present study, the geometries of the competitive adsorption of chromate and sulfate on Ni-substituted magnetite surfaces over a pH range of 4–9 were investigated using in situ attenuated total reflectance Fourier transform infrared spectroscopy and two-dimensional correlation analysis. In individual adsorption, nonprotonated monodentate mononuclear (NMM) complexes dominated chromate adsorption, accompanied by a few bidentate binuclear (BB) complexes. For sulfate, NMM complexes and outer-sphere (OS) species predominated under acidic and neutral–alkaline conditions, respectively. The above variation in adsorption configuration resulted in the different adsorption competitiveness between chromate and sulfate at different pH values. Specifically, the NMM complexes of chromate were substituted by NMM sulfate complexes under acidic conditions and vice versa. However, under neutral and alkaline conditions, the OS species of sulfate scarcely affected the adsorption of chromate. The adsorption affinity of chromate and sulfate on Ni-substituted magnetite increased in the following order: OS complex (sulfate) < NMM complexes (chromate) < NMM complexes (sulfate).
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Shojaipour M, Ghaemy M. Highly efficient and antibacterial ion exchanger based on graphene oxide for removal of chromate and nitrate from water: synthesis, characterization and application. NEW J CHEM 2021. [DOI: 10.1039/d0nj04277c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A novel recyclable antibacterial anion exchanger based on graphene oxide (GO) and quaternary ammonium chloride (TMSQA) as a crosslinker/ion exchanger was prepared and used for the removal of chromate and nitrate from water.
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Affiliation(s)
- Maryam Shojaipour
- Polymer Research Laboratory
- Faculty of Chemistry
- University of Mazandaran
- Babolsar
- Iran
| | - Mousa Ghaemy
- Polymer Research Laboratory
- Faculty of Chemistry
- University of Mazandaran
- Babolsar
- Iran
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15
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Bae S, Yoon S, Kaplan U, Kim H, Han S, Lee W. Effect of groundwater ions (Ca 2+, Na +, and HCO 3-) on removal of hexavalent chromium by Fe(II)-phosphate mineral. J Hazard Mater 2020; 398:122948. [PMID: 32497861 DOI: 10.1016/j.jhazmat.2020.122948] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 05/08/2020] [Accepted: 05/09/2020] [Indexed: 06/11/2023]
Abstract
A systematic study was conducted to investigate the effect of major groundwater ions (i.e., Ca2+, Na+, and HCO3-) on removal of hexavalent chromium (Cr(VI)) by an Fe(II)-phosphate mineral (i.e., vivianite). The batch experiments revealed that the second-order rate constant for Cr(VI) removal by vivianite with Ca2+ + CO32- (0.076-1.90 mM) and Na+ + HCO3- (0.26-6.50 mM) was 1.5-5.2 times lower than that without these ions. The removal kinetics of Cr(VI) by vivianite was abruptly slowed down with the increased ion concentration, which showed their inhibitory effect on the reaction. The results of the geochemical modeling and density functional theory calculations showed that the presence of Ca2+ + HCO3- and Na+ + HCO3- can form less favorable Cr(VI) species (i.e., CaCrO4(aq) and NaCrO4-) on the Fe-B site of vivianite surface, leading to the inhibitory effect observed in this study. Finally, the X-ray absorption spectroscopy results showed that reductive immobilization of Cr(VI) to Cr(III) occurred by structural Fe(II) oxidation of vivianite to amorphous mixed-valence Fe-phosphate via an inner-sphere complexation. The results suggest that the presence of Ca2+, Na+, and HCO3- in phosphorous-enriched iron-reducing environments may lower the remedial efficiency of Cr(VI) removal.
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Affiliation(s)
- Sungjun Bae
- Department of Civil and Environmental Engineering, Konkuk University, Seoul 05029, South Korea
| | - Sunho Yoon
- Department of Civil and Environmental Engineering, Konkuk University, Seoul 05029, South Korea
| | - Ugras Kaplan
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany
| | - Hyungjun Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 34141, South Korea
| | - Seunghee Han
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, South Korea
| | - Woojin Lee
- Department of Civil and Environmental Engineering, Green Environment and Energy Lab., National Laboratory Astana, Nazarbayev University, Nur-Sultan 010000, Kazakhstan.
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Burton ED, Choppala G, Vithana CL, Karimian N, Hockmann K, Johnston SG. Chromium(VI) formation via heating of Cr(III)-Fe(III)-(oxy)hydroxides: A pathway for fire-induced soil pollution. Chemosphere 2019; 222:440-444. [PMID: 30716546 DOI: 10.1016/j.chemosphere.2019.01.172] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 11/30/2018] [Accepted: 01/29/2019] [Indexed: 06/09/2023]
Abstract
Mixed Cr(III)-Fe(III) (oxy)hydroxides are important Cr-bearing phases in natural, unpolluted soil. Fires frequently affect large areas of land around the world, causing the temporary development of elevated soil temperatures. This study examines the hypothesis that heating Cr(III)-Fe(III) (oxy)hydroxides at temperatures which occur in surface soils during fires can drive rapid oxidation of Cr(III) to hazardous Cr(VI). To test this, poorly-ordered Cr(III)x-Fe(III)1-x (oxy)hydroxides, with x spanning 0.1 to 0.9, were heated at up to 800 °C for 2 h. Heating at 400-800 °C produced a highly crystalline hematite-eskolaite solid-solution (FeIII2-nCrIIInO3, where n ranges from 0 to 2). Chromium K-edge X-ray absorption spectroscopy showed that during heating up to ∼40% of the initial Cr(III) was oxidized to Cr(VI), with the greatest extent of Cr(VI) formation occurring at 200-400 °C. At these temperatures, a substantial proportion (17%-70%) of the newly-formed Cr(VI) was exchangeable (i.e. extracted by a pH 7.2, 10 mM PO43- solution). This suggests that much of the Cr(VI) formed by heating of Cr(III)x-Fe(III)1-x (oxy)hydroxides at 200-400 °C is likely to be relatively mobile in fire-impacted soils. The results of this study provide new insights into a potentially-important pathway for the in-situ formation of Cr(VI) in soil.
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Affiliation(s)
- Edward D Burton
- Southern Cross University, Southern Cross GeoScience, Lismore, NSW 2480, Australia.
| | - Girish Choppala
- Southern Cross University, Southern Cross GeoScience, Lismore, NSW 2480, Australia
| | - Chamindra L Vithana
- Southern Cross University, Southern Cross GeoScience, Lismore, NSW 2480, Australia; Department of Geology, Faculty of Science, University of Peradeniya, Peradeniya, Sri Lanka
| | - Niloofar Karimian
- Southern Cross University, Southern Cross GeoScience, Lismore, NSW 2480, Australia
| | - Kerstin Hockmann
- Southern Cross University, Southern Cross GeoScience, Lismore, NSW 2480, Australia; University of Bayreuth, Environmental Geochemistry, Universitaetsstrasse 30, 95440, Bayreuth, Germany
| | - Scott G Johnston
- Southern Cross University, Southern Cross GeoScience, Lismore, NSW 2480, Australia
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Burton ED, Choppala G, Karimian N, Johnston SG. A new pathway for hexavalent chromium formation in soil: Fire-induced alteration of iron oxides. Environ Pollut 2019; 247:618-625. [PMID: 30711817 DOI: 10.1016/j.envpol.2019.01.094] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 01/22/2019] [Accepted: 01/22/2019] [Indexed: 06/09/2023]
Abstract
Iron oxides are important pedogenic Cr(III)-bearing phases which experience high-temperature alteration via fire-induced heating of surface soil. In this study, we examine if heating-induced alteration of Cr(III)-substituted Fe oxides can potentially facilitate rapid high-temperature oxidation of solid-phase Cr(III) to hazardous Cr(VI). Synthetic Cr(III)-substituted ferrihydrite, goethite and hematite were heated up to 800 °C for 2 h. Corresponding heating experiments were also conducted on an unpolluted Ferrosol-type soil, which had a total Cr content of 220 mg kg-1, initially undetectable Cr(VI) and Fe speciation comprising a mixture of hematite, goethite and ferrihydrite (according to Fe K-edge EXAFS spectroscopy). Up to ∼50% of the initial Cr(III) was oxidised to Cr(VI) during heating of Cr(III)-substituted ferrihydrite and hematite, with the greatest extent of Cr(VI) formation occurring at 200-400 °C. In contrast, heating of Cr(III)-substituted goethite resulted in up to ∼100% of Cr(III) oxidizing to Cr(VI) as the temperature approached 800 °C. In the Ferrosol-type soil, heating at ≥400 °C also resulted in large amounts of Cr(VI) formation, with a maximum total Cr(VI) concentration of 77 mg kg-1 forming at 600 °C (equating to oxidation of ∼35% of the soil's total Cr content). A relatively large portion (31-42%) of the total Cr(VI) which formed during heating of the soil was exchangeable, implying a high level of potential mobility and bioaccessibility. Overall, the results show that Cr(VI) forms rapidly via the oxidation of Fe oxide-bound Cr(III) at temperatures which occur in surface soils during fires. On this basis and given the frequency and extent of wild-fires around the world, we propose that fire-induced oxidation of Fe oxide-bound Cr(III) may represent a globally-significant pathway for the natural formation of hazardous Cr(VI) in surface soil.
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Affiliation(s)
- Edward D Burton
- Southern Cross University, Southern Cross GeoScience, Lismore, NSW, 2480, Australia.
| | - Girish Choppala
- Southern Cross University, Southern Cross GeoScience, Lismore, NSW, 2480, Australia
| | - Niloofar Karimian
- Southern Cross University, Southern Cross GeoScience, Lismore, NSW, 2480, Australia
| | - Scott G Johnston
- Southern Cross University, Southern Cross GeoScience, Lismore, NSW, 2480, Australia
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Park M, Park J, Kang J, Han YS, Jeong HY. Removal of hexavalent chromium using mackinawite (FeS)-coated sand. J Hazard Mater 2018; 360:17-23. [PMID: 30075379 DOI: 10.1016/j.jhazmat.2018.07.086] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 07/21/2018] [Accepted: 07/23/2018] [Indexed: 06/08/2023]
Abstract
This study investigates the feasibility of mackinawite (FeS)-coated sand in permeable reactive barrier applications to treat Cr(VI)-contaminated groundwater under anoxic conditions. For this, Cr(VI) sorption experiments were conducted using both coated and uncoated sands. Solution-phase Cr speciation and Cr K-edge X-ray absorption near-edge structure (XANES) analysis indicated the complete reduction of Cr(VI) to Cr(III) by coated sand. At pH 4.7, substantial amounts of Cr(III) remained in solution due to its unfavorable cationic adsorption at acidic pH. At pH 7.1 and 9.8, it was quantitatively immobilized by forming Cr(III)-bearing precipitates. In contrast, uncoated sand showed the decreasing Cr(VI) sorption with pH. In uncoated sand, magnetite impurities would mediate the partial reduction of Cr(VI). Thus, the pH-dependent sorption by uncoated sand was due to both unfavorable anionic Cr(VI) adsorption and its lesser reduction to Cr(III) with pH. Compared to uncoated sand, coated sand showed significantly increased Cr(VI) sorption at neutral to basic pH. By Fe K-edge XANES analysis, FeS was mainly responsible for Cr(VI) reduction by coated sand, with a green rust-like phase being the major Fe product. Since Fe(OH)3 is not thermodynamically stable under the redox conditions favoring formation of green rust, Fe(III)-substituted Cr(OH)3 likely represents a Cr(III)-bearing phase.
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Affiliation(s)
- Minji Park
- Department of Geological Sciences, Pusan National University, Busan, 46241, South Korea.
| | - Jiwon Park
- Department of Geological Sciences, Pusan National University, Busan, 46241, South Korea.
| | - Jungchun Kang
- Korea Chemical management Association, Seocho-daero 88, Seocho-gu, Seoul, 06673, South Korea.
| | - Young-Soo Han
- Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources, Deajeon, 34132, South Korea.
| | - Hoon Young Jeong
- Department of Geological Sciences, Pusan National University, Busan, 46241, South Korea.
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Kokorin AI, Kulyabko LS, Degtyarev EN, Kovarskii AL, Patsaeva SV, Dzhardimalieva GI, Yurishcheva AA, Kydralieva KA. Structure and Properties of Nanosized Composites Based on Fe3O4 and Humic Acids. Russ J Phys Chem B 2018. [DOI: 10.1134/s1990793118010207] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Kosmulski M. The pH dependent surface charging and points of zero charge. VII. Update. Adv Colloid Interface Sci 2018; 251:115-38. [PMID: 29153243 DOI: 10.1016/j.cis.2017.10.005] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 10/25/2017] [Accepted: 10/25/2017] [Indexed: 02/06/2023]
Abstract
The pristine points of zero charge (PZC) and isoelectric points (IEP) of metal oxides and IEP of other materials from the recent literature, and a few older results (overlooked in previous searches) are summarized. This study is an update of the previous compilations by the same author [Surface Charging and Points of Zero Charge, CRC, Boca Raton, 2009; J. Colloid Interface Sci. 337 (2009) 439; 353 (2011) 1; 426 (2014) 209]. The field has been very active, but most PZC and IEP are reported for materials, which are very well-documented already (silica, alumina, titania, iron oxides). IEP of (nominally) Gd2O3, NaTaO3, and SrTiO3 have been reported in the recent literature. Their IEP were not reported in older studies.
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Sakulthaew C, Chokejaroenrat C, Poapolathep A, Satapanajaru T, Poapolathep S. Hexavalent chromium adsorption from aqueous solution using carbon nano-onions (CNOs). Chemosphere 2017; 184:1168-1174. [PMID: 28672698 DOI: 10.1016/j.chemosphere.2017.06.094] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 06/19/2017] [Accepted: 06/21/2017] [Indexed: 05/20/2023]
Abstract
The capacity of carbon nano-onions (CNOs) to remove hexavalent chromium (Cr(VI)) from aqueous solution was investigated. Batch experiments were performed to quantify the effects of the dosage rate, pH, counter ions, and temperature. The adsorption of Cr(VI) onto CNOs was best described by a pseudo-second order rate expression. The adsorption efficiency increased with increasing adsorbent dosage and contact time and reached equilibrium in 24 h. The equilibrium data showed better compliance with a Langmuir isotherm than a Freundlich isotherm. Effective removal of Cr(VI) was demonstrated at pH values ranging from 2 to 10. The adsorption capacity of Cr(VI) was found to be highest (82%) at pH 3.4 and greatly depended on the solution pH. We found that Cr(VI) adsorption decreased with increasing pH over the pH range of 3.4-10. The adsorption capacity increased dramatically when the temperature increased from 10 °C to 50 °C regardless of the amount of CNOs used. Cr(VI) removal decreased by ∼13% when Zn(II), Cu(II), and Pb(II) were present, while there were no significant changes observed when NO3- or SO42- was present. The overall results support that CNOs can be used as an alternative adsorbent material to remove Cr(VI) in the water treatment industry.
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Affiliation(s)
- Chainarong Sakulthaew
- Department of Veterinary Technology, Faculty of Veterinary Technology, Kasetsart University, Bangkok, Thailand.
| | - Chanat Chokejaroenrat
- Department of Environmental Technology and Management, Faculty of Environment, Kasetsart University, Bangkok, Thailand.
| | - Amnart Poapolathep
- Department of Pharmacology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok, Thailand.
| | - Tunlawit Satapanajaru
- Department of Environmental Technology and Management, Faculty of Environment, Kasetsart University, Bangkok, Thailand.
| | - Saranya Poapolathep
- Department of Pharmacology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok, Thailand.
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22
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Luo X, Yu L, Wang C, Yin X, Mosa A, Lv J, Sun H. Sorption of vanadium (V) onto natural soil colloids under various solution pH and ionic strength conditions. Chemosphere 2017; 169:609-617. [PMID: 27912185 DOI: 10.1016/j.chemosphere.2016.11.105] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 11/17/2016] [Accepted: 11/20/2016] [Indexed: 06/06/2023]
Abstract
Batch sorption kinetics and isothermal characteristics of V(V) were investigated on three natural soil colloids (manual loessial soil colloid (MSC), aeolian sandy soil colloid (ASC), and cultivated loessial soil colloid (CSC)) under various solution pH and ionic strength (IS) conditions. Colloids were characterized by atomic force microscopy (AFM), X-ray diffraction (XRD), and fourier transform infrared spectroscopy (FTIR). AFM micrographs showed CSC with an aggregated shape with larger particle diameter as compared with ASC and MSC. XRD spectra revealed the presence of different minerals in natural soil colloids including biotite, kaolinite, calcite and quartz, which might contribute to sorption process. The sorption ability decreased with increase of colloidal particle size. The sorption was mainly attributed to complexation by active carboxylate and alcohol groups of colloidal components. Sorption kinetics and isotherms of V(V) onto natural soil colloids were best fitted with Pseudo-second-order and Freundlich models. Langmuir model indicated that sorption capacity of MSC and ASC was comparable (285.7 and 238.1 mg g-1); however, CSC exhibited the lowest sorption capacity (41.5 mg g-1) due to its larger particle diameter and aggregated shape. The maximum V(V) sorption capacity reached plateau values at a solution pH ranged between 5.0 and 9.0 for MSC and ASC, and 6.0-8.0 for CSC. Sorption capacity of V(V) onto natural soil colloids decreased with increasing IS. Based on result of this study we can conclude that sorption of V(V) onto natural soil colloids is pH- and IS-dependent. These findings provide insights on the remediation of vanadium-contaminated soils.
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Affiliation(s)
- Xiuhua Luo
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China
| | - Lin Yu
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China
| | - Changzhao Wang
- Shaanxi Entry-Exit Inspection and Quarantine Bureau, Xian, 710068, China
| | - Xianqiang Yin
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China.
| | - Ahmed Mosa
- Soils Department, Faculty of Agriculture, Mansoura University, Mansoura, 35516, Egypt
| | - Jialong Lv
- 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.
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