Frontiers of Environmental Science & Engineering
>> 2014,
Volume 8,
Issue 3
doi:
10.1007/s11783-013-0545-9
RESEARCH ARTICLE
Electrochemical oxidation of humic acid at the antimony- and nickel-doped tin oxide electrode
Department of Environmental Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Available online: 2014-05-19
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Abstract
This work investigated the degradation of humic acid (HA) in aqueous solution by electrochemical oxidation with Antimony- and Nickel-doped Tin oxide electrode (Ni-Sb-SnO /Ti electrode) as the anode. Initial concentrations of HA ranged from 3 to 9 mg·L . Under such a concentration scope, the degradation of HA was a mass transfer controlled process. Degradation rate increased with the increase of HA initial concentration. Test on the effect of tert-butanol revealed that ·OH played an important role in the oxidation of HA. The absence of cation Ca was beneficial to HA degradation, which suggested that both indirect and direct electrolyze happened during the whole electrochemical oxidation process. Alkaly (pH= 12) and neutral (pH= 7) conditions were benefical to HA degradation.
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