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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 (sub 4) and biochar pyrolyzed at 600 degrees C. Wheat straw biochar, as a carrier, significantly enhanced the removal of trichloroethylene (TCE) by nZVI. The pseudo-first-orde... Full description

Journal Title: PloS one 2017, Vol.12(3), p.e0172337
Main Author: Li, Hui
Other Authors: Chen, Ya Qin , Chen, Shuai , Wang, Xiao Li , Guo, Shu , Qiu, Yue Feng , Liu, Yong Di , Duan, Xiao Li , Yu, Yun Jiang
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1932-6203 ; DOI: 10.1371/journal.pone.0172337
Link: http://search.proquest.com/docview/1875141458/?pq-origsite=primo
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recordid: proquest1875141458
title: Wheat straw biochar-supported nanoscale zerovalent iron for removal of trichloroethylene from groundwater.
format: Article
creator:
  • Li, Hui
  • Chen, Ya Qin
  • Chen, Shuai
  • Wang, Xiao Li
  • Guo, Shu
  • Qiu, Yue Feng
  • Liu, Yong Di
  • Duan, Xiao Li
  • Yu, Yun Jiang
subjects:
  • Adsorption–Chemistry
  • Anions–Chemistry
  • Charcoal–Chemistry
  • Groundwater–Chemistry
  • Hydrogen-Ion Concentration–Chemistry
  • Iron–Chemistry
  • Kinetics–Chemistry
  • Trichloroethylene–Chemistry
  • Triticum–Chemistry
  • Water Pollutants, Chemical–Chemistry
  • Anions
  • Water Pollutants, Chemical
  • Biochar
  • Charcoal
  • Trichloroethylene
  • Iron
ispartof: PloS one, 2017, Vol.12(3), p.e0172337
description: This study synthesized the wheat straw biochar-supported nanoscale zerovalent iron (BC-nZVI) via in-situ reduction with NaBH (sub 4) and biochar pyrolyzed at 600 degrees 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 (super -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 (sub 4) (super 2-) , HCO (sub 3) (super -) and NO (sub 3) (super -) 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 (super -1) to 80 mg. (super 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.
language: eng
source:
identifier: E-ISSN: 1932-6203 ; DOI: 10.1371/journal.pone.0172337
fulltext: fulltext
issn:
  • 19326203
  • 1932-6203
url: Link


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titleWheat straw biochar-supported nanoscale zerovalent iron for removal of trichloroethylene from groundwater.
creatorLi, Hui ; Chen, Ya Qin ; Chen, Shuai ; Wang, Xiao Li ; Guo, Shu ; Qiu, Yue Feng ; Liu, Yong Di ; Duan, Xiao Li ; Yu, Yun Jiang
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identifierE-ISSN: 1932-6203 ; DOI: 10.1371/journal.pone.0172337
subjectAdsorption–Chemistry ; Anions–Chemistry ; Charcoal–Chemistry ; Groundwater–Chemistry ; Hydrogen-Ion Concentration–Chemistry ; Iron–Chemistry ; Kinetics–Chemistry ; Trichloroethylene–Chemistry ; Triticum–Chemistry ; Water Pollutants, Chemical–Chemistry ; Anions ; Water Pollutants, Chemical ; Biochar ; Charcoal ; Trichloroethylene ; Iron
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descriptionThis study synthesized the wheat straw biochar-supported nanoscale zerovalent iron (BC-nZVI) via in-situ reduction with NaBH (sub 4) and biochar pyrolyzed at 600 degrees 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 (super -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 (sub 4) (super 2-) , HCO (sub 3) (super -) and NO (sub 3) (super -) 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 (super -1) to 80 mg. (super 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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