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Advantage of selective production of green rusts for Sb(Ⅴ) removal in Fe(0) electrocoagulation

Chinese Chemical Letters 2020年第10期31卷 2779-2783页

作者： Di Cao Meng Qiao Angzhen Li Jingwei Hao Xu Zhao Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China China ENFI Engineering Corporation Beijing 100038China China Academy of Urban Planning and Design Beijing 100037China

The re moval efficiency of pollutants in Fe(O) electrocoagulation(EC) has been associated closely with the speciation of generated Fe(Ⅱ)/Fe(Ⅲ) oxides during this process,which is very complicated and can be affected by various *** this work,in-situ Raman,X-ray diffraction and some other techniques have been used to study the speciation of Fe under different conditions and to establish a relationship between Fe speciation and Sb(V) removal *** indicated that concentration of dissolved oxygen(DO)is a key factor influencing Fe(O) *** was found that green rusts(GRs) were formed and were then transformed into magnetite at lower DO concentration,and Sb(V) removal efficiency reached 99.9% after30 min of *** contrast,γ-FeOOH was formed at high DO concentration,and the removal efficiency of Sb(V) after 30 min of EC was only 72.8%.In the presence of sulfite and phosphate with low concentrations,GRs can be stabilized and benefit the removal of Sb(V).We believe this work will provide some new insights on the mechanism of Fe(O) EC and the effective removal of other pollutants during Fe(O)EC process.

关键词： iron electrocoagulation Antimony Green rusts Sodium sulfite Phosphate

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