Shen Hongyu, Zhong Dengjie, Xu Yunlan, Chang Haixing, Wang Hui, Xu Chunzi, Mou Jiaxing, Zhong Nianbing
School of Chemical Engineering, Chongqing University of Technology, Chongqing, 400054, China.
School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing, 400054, China.
Environ Sci Pollut Res Int. 2023 Jan;30(3):5847-5860. doi: 10.1007/s11356-022-22609-5. Epub 2022 Aug 19.
In this work, a magnetic core-shell composite zero-valent iron/copper-polyacrylate (ZVI/Cu-PAA) was synthesized by a simple liquid-phase reduction process and used for hexavalent chromium Cr(VI) removal from wastewater. The optimization experiments show that the optimal dosages of polyacrylate and Cu are 7.00 wt% and 8.25 wt%, respectively. The maximum adsorption capacity and removal rate of Cr(VI) by ZVI/Cu-PAA reached 106.12 mg g and 99.05% at pH 5.5, respectively. Furthermore, the presence of coexisting ions such as Ca, Mg, Na, and NO had no significant effect on its Cr(VI) removal performance. The excellent performance of ZVI/Cu-PAA is attributed to that the modification of polyacrylate can not only give more active sites but also inhibit agglomeration of nano-metallic particles, while Cu doping promotes the electron generation and transformation of Fe(III)/Fe(II) and Cu(II)/Cu(I) redox cycles. This makes ZVI/Cu-PAA has rich active sites and excellent stability, and has broad application prospects in the remediation of Cr (VI) polluted wastewater. The magnetic core-shell composite ZVI/Cu-PAA has excellent Cr (VI) removal performance because of its rich active sites and high electron transformation efficiency.
在本工作中，通过简单的液相还原法合成了一种磁性核壳复合零价铁/聚丙烯酸铜（ZVI/Cu-PAA），并将其用于去除废水中的六价铬Cr(VI)。优化实验表明，聚丙烯酸酯和铜的最佳用量分别为7.00 wt%和8.25 wt%。在pH 5.5时，ZVI/Cu-PAA对Cr(VI)的最大吸附容量和去除率分别达到106.12 mg/g和99.05%。此外，Ca、Mg、Na和NO等共存离子的存在对其Cr(VI)去除性能没有显著影响。ZVI/Cu-PAA的优异性能归因于聚丙烯酸酯的改性不仅可以提供更多的活性位点，还可以抑制纳米金属颗粒的团聚，而铜掺杂促进了Fe(III)/Fe(II)和Cu(II)/Cu(I)氧化还原循环的电子产生和转化。这使得ZVI/Cu-PAA具有丰富的活性位点和优异的稳定性，在Cr(VI)污染废水的修复方面具有广阔的应用前景。磁性核壳复合材料ZVI/Cu-PAA由于其丰富的活性位点和高电子转化效率而具有优异的Cr(VI)去除性能。
