Journal
BIORESOURCE TECHNOLOGY
Volume 175, Issue -, Pages 269-274Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.10.103
Keywords
Biochar; Nanoscale zerovalent iron; Persulfate; Trichloroethylene; Degradation
Funding
- National Science Foundation of China [51309214]
- National Environmental Protection Public Welfare Industry Targeted Research Fund [201309005]
- National High Technology Research and Development Program (863 Program) [2013AA06A208]
- Knowledge Innovative Program of the Chinese Academy of Sciences [KZCX2-YW-BR-19]
- Environmental Protection Research Program of Jiangsu Province, China [2012039]
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Biochar (BC) supported nanoscalezerovalent iron (nZVI) composite was synthesized and used as an activator for persulfate to enhance the trichloroethylene (TCE) removal in aqueous solutions. The degradation efficiency of TCE (0.15 mmol L-1) was 99.4% in the presence of nZVI/BC (4.5 mmol L-1, nZVI to BC mass ratio was 1:5) and persulfate (4.5 mmol L-1) within 5 min, which was significantly higher than that (56.6%) in nZVI-persulfate system under the same conditions. Owing to large specific surface area and oxygen-containing functional groups of BC, nZVI/ BC enhanced the SO4 center dot- generation and accelerated TCE degradation. On the basis of the characterization and analysis data, possible activation mechanisms of the Fe2+/Fe3+ (Fe(II)/Fe(III)) redox action and the electron-transfer mediator of the BC oxygen functional groups promoting the generation of SO4 center dot- in nZVI/BC-persulfate system were clarified. (C) 2014 Elsevier Ltd. All rights reserved.
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