化学
电凝
膦酸盐
凝结
降水
磷酸盐
核化学
螯合作用
柠檬酸
降级(电信)
水处理
无机化学
环境工程
有机化学
心理学
电信
物理
物理化学
精神科
气象学
计算机科学
工程类
作者
Xin Zhang,Yihang Wang,Mingyang Feng,Guang-En Yuan
摘要
Abstract In this study, the performances of electrocoagulation (EC) and chemical coagulation (CC) in removing phosphonate chelators (PCs) from water were explored and compared. As the representative of PCs, nitrilotri(methylphosphonic acid) (NTMP) could be efficiently removed in acid and neutral electrolyte by Fe-EC and at the pH range of 3.0–9.0 by Al-EC process. Precipitation pH had a slight impact on NTMP removal by Fe-CC, while Al-CC process could remove NTMP effectively only at the precipitation pH of 6.0. Fe-EC and Al-CC consumed much less iron or aluminum than the corresponding Fe-CC and Al-EC processes. Part of NTMP was degraded into phosphate during Fe-EC process, and high-valent iron (Fe(VI)O2+) was identified as the key active species responsible for its degradation through quenching experiments. Coexisting substances had no obvious impact on NTMP removal in Al-EC, Fe-CC and Al-CC processes, but NO3− and CO32− inhibited significantly in Fe-EC process. The other PCs could be also removed efficiently in all EC and CC processes but 2-phosphonobutane-1, 2, 4-tricarboxylic acid. By comparison, Fe-EC process is considered as a promising technology for PCs removal from water due to its efficiency, easy accessibility and no addition of exogenous chemicals.
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