| Literature DB >> 28110906 |
Linbo Qian1, Wenying Zhang1, Jingchun Yan1, Lu Han1, Yun Chen1, Da Ouyang1, Mengfang Chen2.
Abstract
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 °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.Entities:
Keywords: Adsorption; Biochars; Hexavalent chromium; Nanoscale zero-valent iron; Reduction
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Year: 2017 PMID： 28110906 DOI： 10.1016/j.envpol.2016.12.077
Source DB: PubMed Journal: Environ Pollut ISSN： 0269-7491 Impact factor: 8.071