期刊
CHEMOSPHERE
卷 272, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.129614
关键词
Electrocoagulation; Super-gravity field; Aluminium anode; Dissolution; Passivation; Wastewater
资金
- National Key Research and Development Program of China, China [2019YFC1905705]
- State Key Laboratory of Advanced Metallurgy, China [41619020]
In the super-gravity field, the dissolution behavior of the aluminum anode changed from pitting corrosion to uniform corrosion, the outer oxidized film of the anode thinned, more Al3+ ions were released, and the mass transfer process of Cl- ions was enhanced by super-gravity, improving the efficiency of the EC process.
Anodic passivation is a key problem to reduce the efficiency of electrocoagulation (EC) process. Super-gravity technology was introduced into EC process to enhance the treatment of heavy metal waste-water using pure aluminum electrode. The results showed that the removal ratio of Cu increased, and the cell voltage decreased with the increase of gravity coefficient, suggesting a promoting effect of super-gravity field on electrocoagulation process. Electrochemical behavior of aluminium anode in super-gravity field was analyzed by potentiodynamic polarization, cyclic voltammetry and electrochemical impedance spectroscopy. It was found that anodic polarization behavior of aluminium showed a typical characteristic of dissolution in super-gravity, rather than passivation in normal gravity. The type of anode dissolution changed from pitting corrosion to uniform corrosion in super-gravity field. The outer oxidized film of anode was thinning, and more Al3+ ions were released by anode dissolution, which was attributed to the super-gravity enhancement of the mass transfer process of Cl- ions. In addition, X-ray diffraction and Fourier transform infrared spectroscopy indicated that the flocs generated in super-gravity field had amorphous and looser Al-O framework structure. As a result, the efficiency of EC process was improved by super-gravity. (C) 2021 Elsevier Ltd. All rights reserved.
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