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六价铬在磁性硫复铁矿（FeS）-十六烷基三甲基溴化铵上的吸附与还原：Fe（II）和S（-II）的主导作用

Adsorption and reduction of hexavalent chromium on magnetic greigite (FeS)-CTAB: leading role of Fe(ii) and S(-ii).

作者信息

Zhou Yanxia, Zhao Yiting, Wu Xiaoge, Yin Weiqin, Hou Jianhua, Wang Shengsen, Feng Ke, Wang Xiaozhi

机构信息

College of Environmental Science and Engineering, Yangzhou University Jiangsu 225127 China

Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization Nanjing 210095 China.

出版信息

RSC Adv. 2018 Sep 10;8(55):31568-31574. doi: 10.1039/c8ra06534a. eCollection 2018 Sep 5.

DOI:10.1039/c8ra06534a
PMID:35548252
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9085568/
Abstract

In this study, a facile one-step route was used to synthesize a novel magnetic mesoporous greigite (FeS)-CTAB composite, which was utilized to remove hexavalent chromium (Cr(vi)). The optimized FeS-CTAB composite with a CTAB dosage of 0.75 g possessed the maximum specific surface, showing the highest Cr(vi) adsorption capacity of 330.03 mg g. The mechanism analysis revealed that Fe(ii) and S(-ii) were critical for the reduction of Cr(vi). CTAB can promote the removal of Cr(vi) by FeS-CTAB composites, possibly due to increased S(-ii) concentration, better dispersion of nanoparticles, and greater zeta potential. Besides, there is mild effect of Fe on Cr(vi) removal, which is confirmed by the disappearance of the Fe peak from the XPS analysis. The pseudo-second-order kinetic model could explain the Cr(vi) removal processes well. The adsorption of Cr(vi) at different initial concentrations was more consistent with a Langmuir isotherm. The existence of H was beneficial for Cr(vi) removal by FeS-CTAB. Our work confirmed that the obtained FeS-CTAB composites exhibit considerable potential for Cr(vi) removal from aqueous solution.

摘要

在本研究中，采用一种简便的一步法合成了一种新型磁性介孔硫复铁矿（FeS）-CTAB复合材料，用于去除六价铬（Cr(Ⅵ)）。CTAB用量为0.75 g时优化后的FeS-CTAB复合材料具有最大比表面积，表现出最高的Cr(Ⅵ)吸附容量，为330.03 mg/g。机理分析表明，Fe(Ⅱ)和S( -Ⅱ)对Cr(Ⅵ)的还原至关重要。CTAB可促进FeS-CTAB复合材料对Cr(Ⅵ)的去除，可能是由于S( -Ⅱ)浓度增加、纳米颗粒分散性更好以及zeta电位更高。此外，Fe对Cr(Ⅵ)去除有轻微影响，XPS分析中Fe峰的消失证实了这一点。准二级动力学模型能够很好地解释Cr(Ⅵ)的去除过程。不同初始浓度下Cr(Ⅵ)的吸附更符合朗缪尔等温线。H的存在有利于FeS-CTAB去除Cr(Ⅵ)。我们的工作证实，所制备的FeS-CTAB复合材料在从水溶液中去除Cr(Ⅵ)方面具有相当大的潜力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a76b/9085568/5ddc6ef157be/c8ra06534a-f7.jpg
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