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富硅生物炭负载纳米零价铁增强 Cr(VI)去除。

Enhanced removal of Cr(VI) by silicon rich biochar-supported nanoscale zero-valent iron.

机构信息

Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, Jiangsu Province, China.

Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, Jiangsu Province, China.

出版信息

Chemosphere. 2019 Jan;215:739-745. doi: 10.1016/j.chemosphere.2018.10.030. Epub 2018 Oct 12.

DOI:10.1016/j.chemosphere.2018.10.030
PMID:30347367
Abstract

Silicon-rich biochar-supported nanoscale zero-valent iron (nZVI) was studied to evaluate enhanced removal of hexavalent chromium (Cr(VI)) in solution. The compositional structures of the nZVI and biochar-supported nZVI were analyzed by Fourier transform infrared spectroscopy, X-ray diffraction and X-ray photoelectron spectra before and after Cr(VI) reaction. The removal amount of Cr(VI) by nZVI-RS700 (rice straw pyrolyzed at 700 °C) was considerably greater than that by nZVI and other biochar-supported nZVI samples. Upon the silicon was removed from RS700 (nZVI-RS700(-Si)), a significant decreased removal of Cr(VI) was observed. It was revealed that nZVI supported by silicate particles of biochar and the promotion of iron oxidation by SiO both contribute to the enhanced Cr(VI) removal. We found that the reduction and adsorption both contributed to the removal of Cr(VI), ferrous chromite (FeCrO) was observed on the surface of the nZVI-RS700 composite. The formation of FeCrO is attributed to the reduction of Cr(VI) by nZVI and the adsorption of chromium oxide with iron on the surface of RS700. Therefore, RS700-supported nZVI can be used as a potential remediation reagent to treat Cr(VI)-contaminated groundwater.

摘要

富硅生物炭负载纳米零价铁（nZVI）用于评估其增强去除溶液中六价铬（Cr(VI)）的效果。通过傅里叶变换红外光谱、X 射线衍射和 X 射线光电子能谱分析了 nZVI 和生物炭负载 nZVI 在前、后 Cr(VI)反应前后的组成结构。与 nZVI 和其他生物炭负载 nZVI 样品相比，nZVI-RS700（在 700°C 下热解的稻秆）对 Cr(VI)的去除量要大得多。当 RS700 中的硅被去除（nZVI-RS700(-Si)）时，Cr(VI)的去除量显著降低。结果表明，生物炭中硅酸盐颗粒负载的 nZVI 和 SiO 促进铁氧化都有助于增强 Cr(VI)的去除。研究发现，还原和吸附都有助于去除 Cr(VI)，在 nZVI-RS700 复合材料的表面观察到了亚铁铬矿（FeCrO）。FeCrO 的形成归因于 nZVI 还原 Cr(VI)以及 RS700 表面的铁吸附氧化铬。因此，负载在 RS700 上的 nZVI 可用作处理 Cr(VI)污染地下水的潜在修复试剂。

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