期刊
WATER RESEARCH
卷 43, 期 5, 页码 1432-1440出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2008.12.023
关键词
RuO2/Ti electrode; Ammonia degradation; Photoelectrochemical process; Active chlorine radicals
资金
- P.R. China [50621804]
- National Natural Science Foundation of China [50538090]
An electrochemical process combined with ultraviolet light irradiation (UPE) using non-photoactive dimensionally stable anodes (DSAs) like RuO2/Ti and IrO2/Ti in the presence of chlorides was investigated for ammonia degradation. In this process, the in situ electrogenerated active chlorine and in situ photogenerated chlorine radicals were responsible for the high efficiency of ammonia degradation. More than 97% of ammonia was converted to nitrogen and a significantly synergistic effect was confirmed. Compared with the single electrochemical (E) and photochemical (P) process, the degradation rates of ammonia and the average current efficiencies (ACEs) of the UPE process increased by 1.5 and 1.7 times using RuO2/Ti and IrO2/Ti electrodes, respectively. on the basis of the linear voltammograms, Electrochemical impedance Spectra (EIS), UV-vis spectra, Electron Spin Resonance (ESR) analysis and a series of experiments designed, the synergistic mechanism was investigated. in addition, this unique process succeeded in transferring the reaction from the electrode surface to the bulk of the solution compared with the conventional photo-electrocatalytic (PEC) process. The loss of chloride decreased from 21.0% to 7.2% and the recycle of chloride was accelerated in the UPE process. Finally the effects of initial pH, current density and ammonia-nitrogen concentration were discussed. Results indicated that pH and ammonia concentration exerted little influences on the degradation rates and current density was the rate-determining factor. (C) 2009 Elsevier Ltd. All rights reserved.
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