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Yu K, Lv Y, Liu C, Boyd SA, Teppen BJ, Li H. Reaction of decabromodiphenyl ether with organo-modified clay-templated zero-valent iron in water-tetrahydrofuran solution: Nano- to micrometric scale effects. JOURNAL OF HAZARDOUS MATERIALS 2023; 445:130538. [PMID: 37055959 PMCID: PMC10105828 DOI: 10.1016/j.jhazmat.2022.130538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 11/27/2022] [Accepted: 12/01/2022] [Indexed: 06/19/2023]
Abstract
Smectite clay-templated nanoscale zero-valent iron (CZVI) was modified with tetramethylammonium (TMA), trimethylphenylammonium (TMPA) and hexadecyltrimethylammonium (HDTMA) to achieve organoclay-templated ZVI (OCZVI). The reactivity of various OCZVIs was evaluated on the basis of degradation of decabromodiphenyl ether (DBDE) in tetrahydrofuran (THF)-water binary solution. Characterization of OCZVI interlayer at nanometric scale indicated that the clay particles had the domains with three basal spacings in the THF/water solution. In the 50 % THF solution TMPA modification promoted the formation of the domains with a basal spacing at 1.56 nm, which could promote the degradation of DBDE. At the micrometric scale, in the 90 % THF solution TMA and TMPA modification tended to enhance the aggregation of OCZVI particles, while the HDTMA modification reduced the aggregation, and high percentage of modification yielded viscous gel structures. The relatively rapid sedimentation processes in 90 % THF solution (compared to that in 50 % THF solution) and formation gel structures could reduce the access of DBDE to the interlayer reactive nZVIs, and lead to the significant reduction in reaction rate. These results provide important insights to the organo-modification on clays which could alter their orientations and dispersion in organic-water binary solution to achieve the desired reactivity on confined clay surfaces.
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Affiliation(s)
- Kai Yu
- Nanchang Hangkong University, Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang, Jiangxi 330063, China; Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, United States
| | - Yanni Lv
- Nanchang Hangkong University, Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang, Jiangxi 330063, China
| | - Cun Liu
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, China
| | - Stephen A Boyd
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, United States
| | - Brian J Teppen
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, United States
| | - Hui Li
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, United States.
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El Wanny N, Le Roux Y, Fournier A, Baroudi M, Woignier T, Feidt C, Delannoy M. Organochlorine POPs sequestration strategy by carbonaceous amendments of contaminated soils: Toward a better understanding of the transfer reduction to laying hens. JOURNAL OF HAZARDOUS MATERIALS 2022; 434:128871. [PMID: 35430457 DOI: 10.1016/j.jhazmat.2022.128871] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 04/01/2022] [Accepted: 04/03/2022] [Indexed: 06/14/2023]
Abstract
PCBs, PCDD/Fs, and Chlordecone (CLD) are POPs found in soils and transferred to animals through involuntary soil ingestion. In this frame, the amendment of contaminated soil with porous matrices, like Biochars (BCs) and Activated Carbons (ACs), is a promising technique for reducing this transfer. In this study, the efficiency of 3 biochars and 3 activated carbons was assessed by amending 2% (by weight) of these matrices on (i) CLD or (ii) PCBs and PCDD/Fs contaminated artificial soils. Porosity of the carbon-based materials and molecules physico-chemical characteristics were then linked to the obtained results. The concentrations of pollutants were then measured in the egg yolks of laying hens (n = 3), which were fed on a daily basis pellets containing 10% of soil for 20 days. Overall, no significant transfer reduction was observed with the biochar and the granular AC amendments for all the compounds. However, significant reductions were obtained with the two efficient activated carbons for PCDD/Fs and DL-PCB up to 79-82% (TEQ basis), whereas only a slight reduction of concentrations was obtained with these activated carbons for CLD and NDL-PCBs. Thus, (i) biochars were not proven efficient to reduce halogenated pollutants transfer to animals, (ii) powdered AC amendments resulted in reducing the bioavailability of soil POPs, and (iii) the effectiveness of such strategy depended on both characteristics of the matrix and of the pollutants.
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Affiliation(s)
- Nadine El Wanny
- Université de Lorraine, INRAE, URAFPA, F-54000 Nancy, France; Lebanese University - Faculty of Public Health-Section III, L.S.E.E., BP 246 Tripoli, Lebanon
| | - Yves Le Roux
- Université de Lorraine, INRAE, URAFPA, F-54000 Nancy, France
| | - Agnès Fournier
- Université de Lorraine, INRAE, URAFPA, F-54000 Nancy, France
| | - Moomen Baroudi
- Lebanese University - Faculty of Public Health-Section III, L.S.E.E., BP 246 Tripoli, Lebanon
| | - Thierry Woignier
- UMR IMBE - Aix Marseille Université, CNRS, IRD, Avignon Université Campus, Lebanon
| | - Cyril Feidt
- Université de Lorraine, INRAE, URAFPA, F-54000 Nancy, France
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Deffo G, Temgoua RCT, Tajeu KY, Njanja E, Doungmo G, Tonle IK, Ngameni E. Signal amplification by electropolymerization of alizarin red S for improved diuron detection at organosmectite modified glassy carbon electrode. J CHIN CHEM SOC-TAIP 2021. [DOI: 10.1002/jccs.202100387] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Gullit Deffo
- Faculty of Science, Department of Chemistry, Electrochemistry and Chemistry of Materials University of Dschang Dschang Cameroon
| | - Ranil Clément Tonleu Temgoua
- Faculty of Science, Department of Chemistry, Electrochemistry and Chemistry of Materials University of Dschang Dschang Cameroon
- CNRS, CEISAM UMR 6230 Université de Nantes Nantes France
| | - Kevin Yemele Tajeu
- Faculty of Science, Department of Chemistry, Electrochemistry and Chemistry of Materials University of Dschang Dschang Cameroon
| | - Evangéline Njanja
- Faculty of Science, Department of Chemistry, Electrochemistry and Chemistry of Materials University of Dschang Dschang Cameroon
| | - Giscard Doungmo
- Institute of Inorganic Chemistry Christian‐Albrechts‐Universität zu Kiel Kiel Germany
| | - Ignas Kenfack Tonle
- Faculty of Science, Department of Chemistry, Electrochemistry and Chemistry of Materials University of Dschang Dschang Cameroon
| | - Emmanuel Ngameni
- Faculty of Science, Department of Chemistry, Laboratory of Analytical Chemistry University of Yaoundé 1 Yaoundé Cameroon
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Tu YJ, Premachandra GS, Boyd SA, Sallach JB, Li H, Teppen BJ, Johnston CT. Synthesis and evaluation of Fe 3O 4-impregnated activated carbon for dioxin removal. CHEMOSPHERE 2021; 263:128263. [PMID: 33297207 PMCID: PMC7733032 DOI: 10.1016/j.chemosphere.2020.128263] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 08/19/2020] [Accepted: 09/02/2020] [Indexed: 06/12/2023]
Abstract
Polychlorinated dibenzo-p-dioxins and -furans (PCDD/PCDFs) are highly toxic organic pollutants in soils and sediments which persist over timescales that extend from decades to centuries. There is a growing need to develop effective technologies for remediating PCDD/Fs-contaminated soils and sediments to protect human and ecosystem health. The use of sorbent amendments to sequester PCDD/Fs has emerged as one promising technology. A synthesis method is described here to create a magnetic activated carbon composite (AC-Fe3O4) for dioxin removal and sampling that could be recovered from soils using magnetic separation. Six AC-Fe3O4 composites were evaluated (five granular ACs (GACs) and one fine-textured powder AC(PAC)) for their magnetization and ability to sequester dibenzo-p-dioxin (DD). Both GAC/PAC and GAC/PAC-Fe3O4 composites effectively removed DD from aqueous solution. The sorption affinity of DD for GAC-Fe3O4 was slightly reduced compared to GAC alone, which is attributed to the blocking of sorption sites. The magnetization of a GAC-Fe3O4 composite reached 5.38 emu/g based on SQUID results, allowing the adsorbent to be easily separated from aqueous solution using an external magnetic field. Similarly, a fine-textured PAC-Fe3O4 composite was synthesized with a magnetization of 9.3 emu/g.
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Affiliation(s)
- Yao-Jen Tu
- School of Environmental and Geographical Sciences, Shanghai Normal University, 100 Guilin Rd., Shanghai, 200234, China
| | | | - Stephen A Boyd
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, MI, 48824, USA
| | - J Brett Sallach
- Department of Environment and Geography, University of York, Heslington, York, YO10 5NG, UK
| | - Hui Li
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, MI, 48824, USA
| | - Brian J Teppen
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, MI, 48824, USA
| | - Cliff T Johnston
- Department of Agronomy, Purdue University, 915 W. State Street, West Lafayette, IN, 47907, USA; Department of Earth, Atmospheric and Planetary Sciences, 550 Stadium Mall, Purdue University, West Lafayette, IN, 47907, USA.
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5
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Deffo G, Tonleu Temgoua RC, Foukmeniok Mbokou S, Njanja E, Kenfack Tonlé I, Ngameni E. A sensitive voltammetric analysis and detection of Alizarin Red S onto a glassy carbon electrode modified by an organosmectite. SENSORS INTERNATIONAL 2021. [DOI: 10.1016/j.sintl.2021.100126] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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6
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Insertion of Iron Decorated Organic-Inorganic Cage-Like Polyhedral Oligomeric Silsesquioxanes between Clay Platelets by Langmuir Schaefer Deposition. MATERIALS 2020; 13:ma13010216. [PMID: 31947932 PMCID: PMC6982069 DOI: 10.3390/ma13010216] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Revised: 12/26/2019] [Accepted: 01/01/2020] [Indexed: 11/17/2022]
Abstract
Tuning the architecture of multilayer nanostructures by exploiting the properties of their constituents is a versatile way to develop multifunctional films. Herein, we report a bottom-up approach for the fabrication of highly ordered hybrid films consisting of dimethyldioctadecylammonium (DODA), iron decorated polyhedral oligomeric silsesquioxanes (POSS), and montmorillonite clay platelets. Clay platelets provided the template where Fe/POSS moieties were grafted by the use of the surfactant. Driven by the iron ions present, DODA adopted a staggered arrangement, which is essential to realize the controllable layer-by-layer growth of the film. The elemental composition of the film was studied by X-ray photoelectron spectroscopy and X-ray reflectivity confirmed the existence of smooth interfaces between the different layers.
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Sallach JB, Crawford R, Li H, Johnston CT, Teppen BJ, Kaminski NE, Boyd SA. Activated carbons of varying pore structure eliminate the bioavailability of 2,3,7,8-tetrachlorodibenzo-p-dioxin to a mammalian (mouse) model. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 650:2231-2238. [PMID: 30292116 DOI: 10.1016/j.scitotenv.2018.09.270] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 09/19/2018] [Accepted: 09/20/2018] [Indexed: 06/08/2023]
Abstract
The use of activated carbon (AC) as an in situ sorbent amendment to sequester polychlorinated-dibenzo-p-dioxins and furans (PCDD/Fs) present in contaminated soils and sediments has recently gained attention as a novel remedial approach. This remedy could be implemented at much lower cost while minimizing habitat destruction as compared to traditional remediation technologies that rely on dredging/excavation and landfilling. Several prior studies have demonstrated the ability of AC amendments to reduce pore water concentrations and hence bioaccumulation of PCDD/Fs in invertebrate species. However, our recent study was the first to show that AC had the ability to sequester 2,3,7,8‑tetrachlorodibenzo‑p‑dioxin (TCDD) in a form that eliminated bioavailability to a mammalian (mouse) model. Here we show that three commercially available ACs, representing a wide range of pore size distributions, were equally effective in eliminating the bioavailability of TCDD based upon two sensitive bioassays, hepatic induction of cyp1A1 mRNA and immunoglobulin M antibody-forming cell response. These results provide direct evidence that a wide range of structurally diverse commercially available ACs may be suitable for use as in situ sorbent amendments to provide a cost-effective remedy for PCDD/F contaminated soils and sediments. Potentially, adaption of this technology would minimize habitat destruction and be protective of ecosystem and human health.
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Affiliation(s)
- J Brett Sallach
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, MI 48824, USA.
| | - Robert Crawford
- Institute for Integrative Toxicology, Michigan State University, East Lansing, MI 48824, USA.
| | - Hui Li
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, MI 48824, USA.
| | - Cliff T Johnston
- Crop, Soil, and Environmental Science, Purdue University, West Lafayette, Indiana 47907, USA.
| | - Brian J Teppen
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, MI 48824, USA.
| | - Norbert E Kaminski
- Institute for Integrative Toxicology, Michigan State University, East Lansing, MI 48824, USA; Department of Pharmacology and Toxicology, Michigan State University, East Lansing, MI 48824, USA.
| | - Stephen A Boyd
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, MI 48824, USA.
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Boyd SA, Sallach JB, Zhang Y, Crawford R, Li H, Johnston CT, Teppen BJ, Kaminski NE. Sequestration of 2,3,7,8-tetrachlorodibenzo-p-dioxin by activated carbon eliminates bioavailability and the suppression of immune function in mice. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2017; 36:2671-2678. [PMID: 28370362 PMCID: PMC6684209 DOI: 10.1002/etc.3815] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 01/04/2017] [Accepted: 03/30/2017] [Indexed: 05/13/2023]
Abstract
The effectiveness of activated carbon in reducing the bioavailability of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) was examined from the context of using in situ sorbent amendments to remediate soils/sediments contaminated with polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDD/Fs). This technology has gained rapid acceptance based on observations that activated carbon amendments predictably lower PCDD/F concentrations in water and bioaccumulation by simple aquatic organisms and earthworms; it has been assumed that bioavailability to mammals is similarly reduced, although this has been disproven for other sorbent materials. In the present study TCDD was absorbed to a microporous activated carbon (TCDD-AC) using the incipient wetness method. An aqueous suspension of TCDD-AC and an equivalent dosage of TCDD in corn oil were administered by oral gavage to B6C3F1 mice. The relative bioavailability of TCDD-AC was determined by quantifying and comparing the hepatic induction of cyp1A1 (messenger ribonucleic acid) and suppression of the immunoglobulin M antibody-forming cell immune response by the 2 forms of TCDD. A concentration-dependent response was observed for both assays when TCDD in corn oil was administered to mice. However, when equivalent masses of TCDD were administered as TCDD-AC, no induction of cyp1A1 or suppression of the immunoglobulin M antibody-forming cell response was observed. The absence of these 2 sensitive aryl hydrocarbon receptor-mediated responses in mice provides the first direct evidence that activated carbon can sequester TCDD in a form that eliminates its bioavailability to mammals. These results support the premise that activated carbon can be used to reduce the bioeffective dose of TCDD delivered to mammals and that activated carbon amendments may provide a low-cost alternative to traditional remediation technologies. Environ Toxicol Chem 2017;36:2671-2678. © 2017 SETAC.
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Affiliation(s)
- Stephen A. Boyd
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, Michigan, 48824
| | - J. Brett Sallach
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, Michigan, 48824
| | - Yingjie Zhang
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, Michigan, 48824
| | - Robert Crawford
- Institute for Integrative Toxicology, Michigan State University, East Lansing, Michigan, 48824
| | - Hui Li
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, Michigan, 48824
| | - Cliff T. Johnston
- Crop, Soil, and Environmental Science, Purdue University, West Lafayette, Indiana, 47907
| | - Brian J. Teppen
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, Michigan, 48824
| | - Norbert E. Kaminski
- Institute for Integrative Toxicology, Michigan State University, East Lansing, Michigan, 48824
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan, 48824
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De Oliveira T, Guégan R, Thiebault T, Milbeau CL, Muller F, Teixeira V, Giovanela M, Boussafir M. Adsorption of diclofenac onto organoclays: Effects of surfactant and environmental (pH and temperature) conditions. JOURNAL OF HAZARDOUS MATERIALS 2017; 323:558-566. [PMID: 27180207 DOI: 10.1016/j.jhazmat.2016.05.001] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Revised: 04/12/2016] [Accepted: 05/01/2016] [Indexed: 05/27/2023]
Abstract
Among pharmaceutical products (PPs) recalcitrant to water treatments, diclofenac shows a high toxicity and remains at high concentration in natural aquatic environments. The aim of this study concerns the understanding of the adsorption mechanism of this anionic PP onto two organoclays prepared with two long-alkyl chains cationic surfactants showing different chemical nature for various experimental pH and temperature conditions. The experimental data obtained by a set of complementary techniques (X-ray diffraction, elemental analyses, gas chromatography coupled with mass spectrometry, and Fourier transform infrared spectroscopy) and the use of Langmuir, Freundlich and Dubinin-Radushkevish equation models, reveal that organoclays show a good affinity to diclofenac which is enhanced as the temperature is under 35°C and for pH above 4.5 (i.e. >pKa of diclofenac) while the chemical nature of surfactant appears to play a minor role. The thermodynamic parameters derived from the fitting procedure point out the strong electrostatic interaction with organic cations adsorbed within the interlayer space in the organoclays for the adsorption of diclofenac. This study stress out the application of organoclays for the adsorption of a recalcitrant PPs in numerous aquatic compartments that can be used as a complement with activated carbon for waste water treatment.
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Affiliation(s)
- Tiago De Oliveira
- Institut des Sciences de la Terre d'Orléans, UMR 7327, CNRS-Université d'Orléans, 1A Rue de la Férollerie, 45071 Orléans Cedex 2, France.
| | - Régis Guégan
- Institut des Sciences de la Terre d'Orléans, UMR 7327, CNRS-Université d'Orléans, 1A Rue de la Férollerie, 45071 Orléans Cedex 2, France.
| | - Thomas Thiebault
- Institut des Sciences de la Terre d'Orléans, UMR 7327, CNRS-Université d'Orléans, 1A Rue de la Férollerie, 45071 Orléans Cedex 2, France.
| | - Claude Le Milbeau
- Institut des Sciences de la Terre d'Orléans, UMR 7327, CNRS-Université d'Orléans, 1A Rue de la Férollerie, 45071 Orléans Cedex 2, France.
| | - Fabrice Muller
- Institut des Sciences de la Terre d'Orléans, UMR 7327, CNRS-Université d'Orléans, 1A Rue de la Férollerie, 45071 Orléans Cedex 2, France.
| | - Vinicius Teixeira
- Institut des Sciences de la Terre d'Orléans, UMR 7327, CNRS-Université d'Orléans, 1A Rue de la Férollerie, 45071 Orléans Cedex 2, France; Centro de Ciências Exatas e da Tecnologia, Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas, 1130, Caxias do Sul, 95070-560, RS, Brazil.
| | - Marcelo Giovanela
- Centro de Ciências Exatas e da Tecnologia, Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas, 1130, Caxias do Sul, 95070-560, RS, Brazil.
| | - Mohammed Boussafir
- Institut des Sciences de la Terre d'Orléans, UMR 7327, CNRS-Université d'Orléans, 1A Rue de la Férollerie, 45071 Orléans Cedex 2, France.
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Mahdavian L. DFT Study to Reduce TCDD by B12N12 Nano-Cage: A Comparison of Calculating Spectroscopic Properties with NMR and NBO. Polycycl Aromat Compd 2016. [DOI: 10.1080/10406638.2016.1238399] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Affiliation(s)
- Leila Mahdavian
- Department of Chemistry, Doroud Branch, Islamic Azad University, Doroud, Iran
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De Oliveira T, Guégan R. Coupled Organoclay/Micelle Action for the Adsorption of Diclofenac. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:10209-10215. [PMID: 27571028 DOI: 10.1021/acs.est.6b03393] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A Na-smectite clay mineral (Na-Mt) was exchanged with various amounts of benzyldimethyltetradecyl ammonium chloride cationic surfactant (BDTAC) up to four times the cation exchange capacity (CEC). The adsorption properties of these organoclays as well as a coupled micelle/organoclay process were evaluated to remove an anionic pharmaceutical product, the diclofenac (DCF), recognized as a recalcitrant compound for conventional water treatments and to be poorly adsorbed onto untreated clay mineral. The DCF affinity appears to depend on the lipophilic character of organoclays in correlation to the density of intercalated BDTA and is particularly enhanced for sorbent systems with free surfactant or micelle in solution. The combination of both organclay and BDTA in excess or micelle as a one pot adsorption system appears to be the most efficient material for the sequestration of DCF and other pharmaceutical products (PPs) with a KF Freundlich constant of 1.7 L g(-1) and no restriction of the adsorbed DCF amount as the linear adsorption isotherm shows. A BDTA hydrophobic core micelle coupled with a positive electric charge forms an organic complex with DCF that is properly intercalated within the interlayer space of BDTA-Mt organoclays as both Fourier transform infrared (FTIR) and X-ray diffraction (XRD) data supported.
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Affiliation(s)
- Tiago De Oliveira
- Institut des Sciences de la Terre d'Orléans, UMR 7327, CNRS-Université d'Orléans , 1A Rue de la Férollerie, 45071 Orléans Cedex 2, France
| | - Régis Guégan
- Institut des Sciences de la Terre d'Orléans, UMR 7327, CNRS-Université d'Orléans , 1A Rue de la Férollerie, 45071 Orléans Cedex 2, France
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12
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Nonionic organoclay: A ‘Swiss Army knife’ for the adsorption of organic micro-pollutants? J Colloid Interface Sci 2015; 437:71-79. [DOI: 10.1016/j.jcis.2014.09.043] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 08/05/2014] [Accepted: 09/16/2014] [Indexed: 11/21/2022]
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13
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Fang Q, Chen B, Zhuang S. Triplex blue-shifting hydrogen bonds of ClO4(-)···H-C in the nanointerlayer of montmorillonite complexed with cetyltrimethylammonium cation from hydrophilic to hydrophobic properties. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:11013-11022. [PMID: 24020648 DOI: 10.1021/es402490k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this study, molecular interactions of perchlorate (ClO4(-)), an emerging pollutant, with cetyltrimethylammonium(CTMA(+)) complexed in the nanointerlayer of negatively charged montmorillonite were characterized using the zeta potentials, FTIR, Raman, and XRD spectroscopy and quantified using quantum mechanical calculations and sorption experiments. We found that blue-shifting hydrogen bonds assisted in the uptake of ClO4(-) from water into the nanointerlayer spacing of CTMA(+)-montmorillonite and were tunable according to CTMA(+) loading. FTIR spectra presented an obvious 47 cm(-1) blue shift in the C-H vibration coming from the N-terminal methyl group of CTMA(+) when ClO4(-) was absorbed. Quantum mechanical calculations based on density functional theory demonstrated that triplex blue-shifting hydrogen bonds of C-H···O were formed between the three terminal methyl groups of CTMA(+) and three oxygen atoms of ClO4(-). The contribution of blue-shifting hydrogen bonds to perchlorate uptake switched from a ClO4(-)/CTMA(+) ratio of 0.0453 at low CTMA(+) loadings to a ClO4(-)/CTMA(+) ratio of 0.2563 (5.6-fold) at high CTMA(+) loadings, which can be ascribed to the evolution of the nanointerlayer microenvironments from hydrophilic properties to hydrophobic properties. The blue-shifting hydrogen bond of C-H···O that is tunable with the hydrophobic nature of the organic phase should be recognized to elucidate the biochemical behavior of perchlorate in organisms.
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Affiliation(s)
- Qile Fang
- Department of Environmental Science, Zhejiang University , Hangzhou, Zhejiang 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollutant Process and Control, Zhejiang University , Hangzhou Zhejiang 310058, China
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