期刊
ENVIRONMENTAL POLLUTION
卷 223, 期 -, 页码 153-160出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2016.12.077
关键词
Biochars; Nanoscale zero-valent iron; Hexavalent chromium; Reduction; Adsorption
资金
- National Natural Science Foundation of China [21507138, 51309214]
- Natural Science Foundation of Jiangsu Province, China [SBK2015041561]
- Frontier Fields during the Thirteenth Five-Year Plan Period of the Institute of Soil Science, Chinese Academy of Sciences [ISSASIP1656]
- National High Technology Research and Development Program [2013AA06A208]
Biochar-supported nanoscale zero-valent iron (nZVI) produced under different temperatures was studied to evaluate the effect of the nZVI-biochar composite on the removal of hexavalent chromium (Cr(VI)) in solution. The structure of biochar-supported nZVI and its roles in Cr(VI) removal were investigated by X Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and batch experiments. The XRD revealed that the removal rate of Cr(VI) for the nZVI supported by rice straw pyrolyzed at 400 degrees C (RS400) was much greater than that for other supporting biochar, and the FTIR further indicated that the carboxyl groups and silicon mineral within the biochar served as dual support sites for nZVI. NZVI-RS400 exhibited the highest removal amount of Cr(VI) at approximately 40.0 mg/g under an initial pH of 4.0, possibly due to both the reduction and adsorption processes. Therefore, the RS400-supported nanoscale zero-valent iron could be a preferable material for Cr(VI)-contaminated groundwater. (C) 2016 Published by Elsevier Ltd.
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