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用于处理含Cr(VI)和4-氯苯酚废水的磁性可分离MoS₂/Fe₃O₄/nZVI纳米复合材料

Magnetically Separable MoS₂/Fe₃O₄/nZVI Nanocomposites for the Treatment of Wastewater Containing Cr(VI) and 4-Chlorophenol.

作者信息

Lu Haijiao, Wang Jingkang, Hao Hongxun, Wang Ting

机构信息

National Engineering Research Center of Industry Crystallization Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.

Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China.

出版信息

Nanomaterials (Basel). 2017 Sep 30;7(10):303. doi: 10.3390/nano7100303.

DOI:10.3390/nano7100303
PMID:28973986
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5666468/
Abstract

With a large specific surface area, high reactivity, and excellent adsorption properties, nano zerovalent iron (nZVI) can degrade a wide variety of contaminants in wastewater. However, aggregation, oxidation, and separation issues greatly impede its wide application. In this study, MoS₂/Fe₃O₄/nZVI nanocomposites were successfully synthesized by a facile step-by-step approach to overcome these problems. MoS₂ nanosheets (MNs) acted as an efficient support for nZVI and enriched the organic pollutants nearby, leading to an enhanced removal efficiency. Fe₃O₄ nanoparticles (NPs) could not only suppress the agglomeration and restacking of MNs, but also facilitate easy separation and recovery of the nanocomposites. The synergistic effect between MNs and Fe₃O₄ NPs effectively enhanced the reactivity and efficiency of nZVI. In the system, Cr(VI) was reduced to Cr(III) by nZVI in the nanocomposites, and Fe produced in the process was combined with H₂O₂ to further remove 4-Chlorophenol (4-CP) through a Fenton reaction. Furthermore, the nanocomposites could be easily separated from wastewater by a magnet and be reused for at least five consecutive runs, revealing good reusability. The results demonstrate that the novel nanocomposites are highly efficient and promising for the simultaneous removal of Cr(VI) and 4-CP in wastewater.

摘要

纳米零价铁（nZVI）具有较大的比表面积、高反应活性和优异的吸附性能，能够降解废水中的多种污染物。然而，团聚、氧化和分离问题极大地阻碍了其广泛应用。在本研究中，通过一种简便的分步方法成功合成了MoS₂/Fe₃O₄/nZVI纳米复合材料以克服这些问题。MoS₂纳米片（MNs）作为nZVI的有效载体，富集了附近的有机污染物，从而提高了去除效率。Fe₃O₄纳米颗粒（NPs）不仅可以抑制MNs的团聚和重新堆叠，还便于纳米复合材料的分离和回收。MNs与Fe₃O₄ NPs之间的协同效应有效地提高了nZVI的反应活性和效率。在该体系中，纳米复合材料中的nZVI将Cr(VI)还原为Cr(III)，过程中产生的Fe与H₂O₂结合，通过芬顿反应进一步去除4-氯酚（4-CP）。此外，纳米复合材料可以通过磁铁轻松地从废水中分离出来，并至少连续重复使用五次，显示出良好的可重复使用性。结果表明，这种新型纳米复合材料在同时去除废水中的Cr(VI)和4-CP方面具有高效性和应用前景。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7f1a/5666468/fbc7bc301869/nanomaterials-07-00303-g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7f1a/5666468/076c83fda820/nanomaterials-07-00303-sch002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7f1a/5666468/63e2f4ef20c2/nanomaterials-07-00303-g009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7f1a/5666468/fbc7bc301869/nanomaterials-07-00303-g013.jpg

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A Novel Nanohybrid Nanofibrous Adsorbent for Water Purification from Dye Pollutants.一种用于从染料污染物中净化水的新型纳米杂化纳米纤维吸附剂。
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