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铜铁双金属纳米颗粒去除废水中的六价铬

Removal of hexavalent chromium from wastewater by Cu/Fe bimetallic nanoparticles.

作者信息

Ye Jien, Wang Yi, Xu Qiao, Wu Hanxin, Tong Jianhao, Shi Jiyan

机构信息

Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China.

MOE Key Laboratory of Environment Remediation and Ecological Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou, 310058, China.

出版信息

Sci Rep. 2021 May 25;11(1):10848. doi: 10.1038/s41598-021-90414-0.

DOI:10.1038/s41598-021-90414-0
PMID:34035405
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8149398/
Abstract

Passivation of nanoscale zerovalent iron hinders its efficiency in water treatment, and loading another catalytic metal has been found to improve the efficiency significantly. In this study, Cu/Fe bimetallic nanoparticles were prepared by liquid-phase chemical reduction for removal of hexavalent chromium (Cr(VI)) from wastewater. Synthesized bimetallic nanoparticles were characterized by transmission electron microscopy, Brunauer-Emmet-Teller isotherm, and X-ray diffraction. The results showed that Cu loading can significantly enhance the removal efficiency of Cr(VI) by 29.3% to 84.0%, and the optimal Cu loading rate was 3% (wt%). The removal efficiency decreased with increasing initial pH and Cr(VI) concentration. The removal of Cr(VI) was better fitted by pseudo-second-order model than pseudo-first-order model. Thermodynamic analysis revealed that the Cr(VI) removal was spontaneous and endothermic, and the increase of reaction temperature facilitated the process. X-ray photoelectron spectroscopy (XPS) analysis indicated that Cr(VI) was completely reduced to Cr(III) and precipitated on the particle surface as hydroxylated Cr(OH) and CrFe(OH) coprecipitation. Our work could be beneficial for the application of iron-based nanomaterials in remediation of wastewater.

摘要

纳米级零价铁的钝化会阻碍其在水处理中的效率，而负载另一种催化金属已被发现可显著提高效率。在本研究中，通过液相化学还原法制备了用于去除废水中六价铬（Cr(VI)）的铜/铁双金属纳米颗粒。采用透射电子显微镜、布鲁诺尔-埃米特-泰勒等温线和X射线衍射对合成的双金属纳米颗粒进行了表征。结果表明，负载铜可显著提高Cr(VI)的去除效率，提高幅度为29.3%至84.0%，最佳铜负载率为3%（重量）。去除效率随初始pH值和Cr(VI)浓度的增加而降低。Cr(VI)的去除用准二级模型比准一级模型拟合得更好。热力学分析表明，Cr(VI)的去除是自发的且吸热的，反应温度的升高促进了该过程。X射线光电子能谱（XPS）分析表明，Cr(VI)被完全还原为Cr(III)，并以羟基化Cr(OH)和CrFe(OH)共沉淀的形式沉淀在颗粒表面。我们的工作可能有助于铁基纳米材料在废水修复中的应用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c61/8149398/568acbf3c07f/41598_2021_90414_Fig7_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c61/8149398/fbc934482ecc/41598_2021_90414_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c61/8149398/5be822bf616c/41598_2021_90414_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c61/8149398/568acbf3c07f/41598_2021_90414_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c61/8149398/3c49ed021226/41598_2021_90414_Fig1_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5c61/8149398/568acbf3c07f/41598_2021_90414_Fig7_HTML.jpg

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