Open AccessEnhanced Fenton-like Degradation of Trichloroethylene by Hydrogen Peroxide Activated with Nanoscale Zero Valent Iron Loaded on Biochar
Author(s) -
Jingchun Yan,
Linbo Qian,
Weiguo Gao,
Yun Chen,
Da Ouyang,
Mengfang Chen
Publication year - 2017
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep43051
Subject(s) - zerovalent iron , hydrogen peroxide , biochar , trichloroethylene , chemistry , radical , degradation (telecommunications) , decomposition , electron paramagnetic resonance , nuclear chemistry , inorganic chemistry , photochemistry , environmental chemistry , organic chemistry , adsorption , telecommunications , pyrolysis , computer science , physics , nuclear magnetic resonance
Composite of nanoscale Zero Valent Iron (nZVI) loaded on Biochar (BC) was prepared and characterized as hydrogen peroxide (H 2 O 2 ) activator for the degradation of trichloroethylene (TCE). nZVI is homogeneously loaded on lamellarly structured BC surfaces to form nZVI/BC with specific surface area (S BET ) of 184.91 m 2 g −1 , which can efficiently activate H 2 O 2 to achieve TCE degradation efficiency of 98.9% with TOC removal of 78.2% within 30 min under the conditions of 0.10 mmol L −1 TCE, 1.13 g L −1 nZVI/BC and 1.50 mmol L −1 H 2 O 2 . Test results from the Electron Spin Resonance (ESR) measurement and coumarin based fluorescent probe technology indicated that ∙OH radicals were the dominant species responsible for the degradation of TCE within the nZVI/BC-H 2 O 2 system. Activation mechanism of the redox action of Fe 2+ /Fe 3+ generated under both aerobic and anaerobic conditions from nZVI and single electron transfer process from BC surface bound C–OH to H 2 O 2 promoted decomposition of H 2 O 2 into ∙OH radicals was proposed.