稳定纳米零价铁和铜双金属插层蒙脱石增强从水溶液中去除六价铬。
Enhanced removal of Cr(VI) from aqueous solution by stabilized nanoscale zero valent iron and copper bimetal intercalated montmorillonite.
机构信息
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, China.
School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, China.
出版信息
J Colloid Interface Sci. 2022 Jan 15;606(Pt 2):941-952. doi: 10.1016/j.jcis.2021.08.075. Epub 2021 Aug 18.
Batch experiments were conducted to study the Cr(VI) removal by nanoscale zero valent iron and copper intercalated montmorillonite (MMT-nFe/Cu) nanocomposite. MMT-nFe/Cu was characterized using SEM, TEM, XRD, FTIR, N adsorption-desorption isotherms and XPS. The results demonstrated that highly dispersed nanoscale Fe/Cu (nFe/Cu) were successfully introduced into the montmorillonite (MMT) layers. In the reaction process, the combination of Cu and Fe acted as a galvanic cell, and electrocorrosion not only speeded up the reaction rate, but also increased reduction activity of nFe. MMT-nFe/Cu as an excellent carrier had good functions in dispersing nFe and Cu particles, pH buffering and could keep nFe and Cu particles from being released. Besides, no iron ions and very low concentrations of copper ions released in the reaction system, which greatly avoided the influence of secondary environmental pollution.
采用批实验研究了纳米零价铁和铜插层蒙脱石（MMT-nFe/Cu）纳米复合材料对六价铬（Cr(VI)）的去除作用。采用 SEM、TEM、XRD、FTIR、N2 吸附-脱附等温线和 XPS 对 MMT-nFe/Cu 进行了表征。结果表明，高度分散的纳米铁/铜（nFe/Cu）成功地引入了蒙脱石（MMT）层中。在反应过程中，Cu 和 Fe 的组合作为一个原电池，电腐蚀不仅加快了反应速率，而且提高了 nFe 的还原活性。MMT-nFe/Cu 作为一种优良的载体，具有分散 nFe 和 Cu 颗粒、缓冲 pH 值和防止 nFe 和 Cu 颗粒释放的良好功能。此外，在反应体系中没有释放出铁离子和铜离子，浓度非常低，这极大地避免了二次环境污染的影响。
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