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Simultaneous removal of nitrate, copper and hexavalent chromium from water by aluminum-iron alloy particles.
Journal of Contaminant Hydrology ( IF 3.6 ) Pub Date : 2019-08-17 , DOI: 10.1016/j.jconhyd.2019.103541
Jingqi Zhang 1 , Jing Wu 1 , Jingbo Chao 2 , Naijie Shi 2 , Haifeng Li 2 , Qing Hu 3 , Xiao Jin Yang 1
Affiliation  

Groundwater contamination is a worldwide concern and the development of new materials for groundwater remediation has been of great interest. This study investigated removal kinetics and mechanisms of nitrate, copper ion and hexavalent chromium (20–50 mg L−1) by particles of Al-Fe alloy consisting of 20% Fe in batch reactors from a single KNO3, CuSO4, Cu(NO3)2, K2Cr2O7 and their mixed solutions. The effects of contaminant interactions and initial pH of the solution were examined and the alloy particles before and after reaction were characterized by X-ray diffraction spectrometer, scanning electron microscopy and X-ray photoelectron spectroscopy. The removal mechanisms were attributed to chemical reduction [Cu(II) to Cu, NO3 to NH3 and Cr(VI) to Cr(III)] and co-precipitation of Cr(III)-Al(III)-Fe(III) hydroxides/oxyhydroxides. Cu(II) enhanced the rates of NO3 and Cr(VI) reduction and Cr(VI) was an inhibitor for Cu(II) and NO3 reduction. This study demonstrates that Al-Fe alloy is of potential for groundwater remediation.



中文翻译:

铝铁合金颗粒同时从水中去除硝酸盐,铜和六价铬。

地下水污染是全世界关注的问题,开发用于地下水修复的新材料引起了人们的极大兴趣。这项研究研究了由20%Fe组成的Al-Fe合金颗粒在间歇反应器中从单一KNO 3,CuSO 4和Cu()去除硝酸盐,铜离子和六价铬(20-50 mg L -1)的动力学和机理。NO 32,K 2 Cr 2 O 7及其混合解决方案。检查了污染物相互作用和溶液初始pH的影响,并通过X射线衍射光谱仪,扫描电子显微镜和X射线光电子能谱表征了反应前后的合金颗粒。去除机制归因于化学还原[铜(II)与Cu,NO 3 - ,以NH 3和Cr(VI)为Cr(III)]和Cr(III)-Al(III)-Fe的共沉淀( III)氢氧化物/羟基氧化物。铜(II)增强NO的速率3 -和Cr(VI)还原和Cr(VI)是对Cu(II)和NO抑制剂3 -还原。这项研究表明,铝铁合金具有修复地下水的潜力。

更新日期:2019-08-17
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