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Activated carbon enhanced ozonation of oxalate attributed to HO·oxidation in bulk solution and surface oxidation: Effect of activated carbon dosage and pH

查看全文 作　　者：Linlin [1,2,3,4]Xing;Yongbing [1,2,3]Xie;Daisuke [5]Minakata;Hongbin [1,2,3]Cao;Jiadong [1,2,3,4]Xiao;Yi [1,2,3]Zhang;John C. [6]Crittenden 高影响力作者 机构地区：[1]National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology;[2]Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences;[3]Beijing Engineering Research Center of Process Pollution Control;[4]University of Chinese Academy of Sciences;[5]Department of Civil and Environmental Engineering, Michigan Technological University,Houghton, MI 49931, United States;[6]School of Civil and Environmental Engineering, Brook Byers Institute for Sustainable Systems, Georgia Institute of Technology,Atlanta,GA 30332, United States高影响力机构 出　　处：《Journal of Environmental Sciences》索引2014年第26卷第10期,共11页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (No. 21177130);the National Key Technology R&D Program (No. 2011BAC06B09);the Chinese Academy of Sciences Visiting Professorships for Senior International Scientists (No. 2009G2-28) 摘　　要：Ozonation of oxalate in aqueous phase was performed with a commercial activated carbon(AC)in this work. The effect of AC dosage and solution pH on the contribution of hydroxyl radicals(HOU) in bulk solution and oxidation on the AC surface to the removal of oxalate was studied. We found that the removal of oxalate was reduced by tert-butyl alcohol(tBA) with low dosages of AC,while it was hardly affected by tBA when the AC dosage was greater than 0.3 g/L. tBA also inhibited ozone decomposition when the AC dosage was no more than 0.05 g/L, but it did not work when the AC dosage was no less than 0.1 g/L. These observations indicate that HOUin bulk solution and oxidation on the AC surface both contribute to the removal of oxalate. HOU oxidation in bulk solution is significant when the dosage of AC is low, whereas surface oxidation is dominant when the dosage of AC is high. The oxalate removal decreased with increasing pH of the solution with an AC dosage of 0.5 g/L. The degradation of oxalate occurs mainly through surface oxidation in acid and neutral solution, but through HOUoxidation in basic bulk solution. A mechanism involving both HOUoxidation in bulk solution and surface oxidation was proposed for AC enhanced ozonation of oxalate. 关 键 词：溶液PH值 表面氧化 臭氧化 草酸盐 活性炭 用量 本体 交流电源
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