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Wheat straw biochar-supported nanoscale zerovalent iron for removal of trichloroethylene from groundwater

This study synthesized the wheat straw biochar-supported nanoscale zerovalent iron (BC-nZVI) via in-situ reduction with NaBH(4) and biochar pyrolyzed at 600°C. Wheat straw biochar, as a carrier, significantly enhanced the removal of trichloroethylene (TCE) by nZVI. The pseudo-first-order rate consta...

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Autores principales: Li, Hui, Chen, Ya Qin, Chen, Shuai, Wang, Xiao Li, Guo, Shu, Qiu, Yue Feng, Liu, Yong Di, Duan, Xiao Li, Yu, Yun Jiang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5338781/
https://www.ncbi.nlm.nih.gov/pubmed/28264061
http://dx.doi.org/10.1371/journal.pone.0172337
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author Li, Hui
Chen, Ya Qin
Chen, Shuai
Wang, Xiao Li
Guo, Shu
Qiu, Yue Feng
Liu, Yong Di
Duan, Xiao Li
Yu, Yun Jiang
author_facet Li, Hui
Chen, Ya Qin
Chen, Shuai
Wang, Xiao Li
Guo, Shu
Qiu, Yue Feng
Liu, Yong Di
Duan, Xiao Li
Yu, Yun Jiang
author_sort Li, Hui
collection PubMed
description This study synthesized the wheat straw biochar-supported nanoscale zerovalent iron (BC-nZVI) via in-situ reduction with NaBH(4) and biochar pyrolyzed at 600°C. Wheat straw biochar, as a carrier, significantly enhanced the removal of trichloroethylene (TCE) by nZVI. The pseudo-first-order rate constant of TCE removal by BC-nZVI (1.079 h(−1)) within 260 min was 1.4 times higher and 539.5 times higher than that of biochar and nZVI, respectively. TCE was 79% dechlorinated by BC-nZVI within 15 h, but only 11% dechlorinated by unsupported nZVI, and no TCE dechlorination occurred with unmodified biochar. Weakly acidic solution (pH 5.7–6.8) significantly enhanced the dechlorination of TCE. Chloride enhanced the removal of TCE, while SO(4)(2−), HCO(3)(−) and NO(3)(−) all inhibited it. Humic acid (HA) inhibited BC-nZVI reactivity, but the inhibition decreased slightly as the concentration of HA increased from 40 mg∙L(-1) to 80 mg∙L(-1), which was due to the electron shutting by HA aggregates. Results suggest that BC-nZVI was promising for remediation of TCE contaminated groundwater.
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spelling pubmed-53387812017-03-10 Wheat straw biochar-supported nanoscale zerovalent iron for removal of trichloroethylene from groundwater Li, Hui Chen, Ya Qin Chen, Shuai Wang, Xiao Li Guo, Shu Qiu, Yue Feng Liu, Yong Di Duan, Xiao Li Yu, Yun Jiang PLoS One Research Article This study synthesized the wheat straw biochar-supported nanoscale zerovalent iron (BC-nZVI) via in-situ reduction with NaBH(4) and biochar pyrolyzed at 600°C. Wheat straw biochar, as a carrier, significantly enhanced the removal of trichloroethylene (TCE) by nZVI. The pseudo-first-order rate constant of TCE removal by BC-nZVI (1.079 h(−1)) within 260 min was 1.4 times higher and 539.5 times higher than that of biochar and nZVI, respectively. TCE was 79% dechlorinated by BC-nZVI within 15 h, but only 11% dechlorinated by unsupported nZVI, and no TCE dechlorination occurred with unmodified biochar. Weakly acidic solution (pH 5.7–6.8) significantly enhanced the dechlorination of TCE. Chloride enhanced the removal of TCE, while SO(4)(2−), HCO(3)(−) and NO(3)(−) all inhibited it. Humic acid (HA) inhibited BC-nZVI reactivity, but the inhibition decreased slightly as the concentration of HA increased from 40 mg∙L(-1) to 80 mg∙L(-1), which was due to the electron shutting by HA aggregates. Results suggest that BC-nZVI was promising for remediation of TCE contaminated groundwater. Public Library of Science 2017-03-06 /pmc/articles/PMC5338781/ /pubmed/28264061 http://dx.doi.org/10.1371/journal.pone.0172337 Text en © 2017 Li et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Li, Hui
Chen, Ya Qin
Chen, Shuai
Wang, Xiao Li
Guo, Shu
Qiu, Yue Feng
Liu, Yong Di
Duan, Xiao Li
Yu, Yun Jiang
Wheat straw biochar-supported nanoscale zerovalent iron for removal of trichloroethylene from groundwater
title Wheat straw biochar-supported nanoscale zerovalent iron for removal of trichloroethylene from groundwater
title_full Wheat straw biochar-supported nanoscale zerovalent iron for removal of trichloroethylene from groundwater
title_fullStr Wheat straw biochar-supported nanoscale zerovalent iron for removal of trichloroethylene from groundwater
title_full_unstemmed Wheat straw biochar-supported nanoscale zerovalent iron for removal of trichloroethylene from groundwater
title_short Wheat straw biochar-supported nanoscale zerovalent iron for removal of trichloroethylene from groundwater
title_sort wheat straw biochar-supported nanoscale zerovalent iron for removal of trichloroethylene from groundwater
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5338781/
https://www.ncbi.nlm.nih.gov/pubmed/28264061
http://dx.doi.org/10.1371/journal.pone.0172337
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