Citation: Cao Di, Qiao Meng, Li Angzhen, Hao Jingwei, Zhao Xu. Advantage of selective production of green rusts for Sb(V) removal in Fe(0) electrocoagulation[J]. Chinese Chemical Letters, ;2020, 31(10): 2779-2783. doi: 10.1016/j.cclet.2020.07.024 shu

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

Cao Di ^a,b,c ,
Qiao Meng ^a,b ,
Li Angzhen ^d ,
Hao Jingwei ^a,b ,
Zhao Xu ^a,b,*,

a.
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
b.
University of Chinese Academy of Sciences, Beijing 100049, China
c.
China ENFI Engineering Corporation, Beijing 100038, China
d.
China Academy of Urban Planning and Design, Beijing 100037, China

zhaoxu@rcees.ac.cn

Received Date: 5 May 2020
Revised Date: 17 June 2020
Accepted Date: 13 July 2020
Available Online: 15 July 2020

Figures(4)

The removal efficiency of pollutants in Fe(0) 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 factors. In 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 efficiency. Results indicated that concentration of dissolved oxygen (DO) is a key factor influencing Fe(0) EC. It 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% after 30 min of EC. In 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(0) EC and the effective removal of other pollutants during Fe(0) EC process.
- Iron electrocoagulation,
- Antimony,
- Green rusts,
- Sodium sulfite,
- Phosphate
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