Activated carbon enhanced ozonation of oxalate attributed to HO. oxidation in bulk solution and surface oxidation： Effect of activated carbon dosage and pH
引用本文：
Linlin Xing,Yongbing Xie,Daisuke Minakat,Hongbin Cao,Jiadong Xiao,Yi Zhang,John C. Crittenden. Activated carbon enhanced ozonation of oxalate attributed to HO. oxidation in bulk solution and surface oxidation： Effect of activated carbon dosage and pH[J]. 环境科学学报(英文版), 2014, 26(10): 2095-2105. DOI: 10.1016/j.jes.2014.08.009
National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing 100190, China;Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;Beijing Engineering Research Center of Process Pollution Control, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China;National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing 100190, China;Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;Beijing Engineering Research Center of Process Pollution Control, Beijing 100190, China;Department of Civil and Environmental Engineering, Michigan Technological University, Houghton, MI 49931, United States;National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing 100190, China;Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;Beijing Engineering Research Center of Process Pollution Control, Beijing 100190, China;National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing 100190, China;Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;Beijing Engineering Research Center of Process Pollution Control, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China;National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing 100190, China;Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;Beijing Engineering Research Center of Process Pollution Control, Beijing 100190, China;School of Civil and Environmental Engineering, Brook Byers Institute for Sustainable Systems, Georgia Institute of Technology, Atlanta, GA 30332, United States
基金项目：
This work was supported by the National Natural Science Foundation of China (No. 21177130), the National Key Technology R&D Program (No. 2011BAC06B09) and the Chinese Academy of Sciences Visiting Professorships for Senior International Scientists (No. 2009G2-28). Daisuke Minakata and John Crittenden appreciate support from the Brook Byers Institute for Sustainable Systems, Hightower Chair, and the Georgia Research Alliance at the Georgia Institute of Technology.
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.
Activated carbon enhanced ozonation of oxalate attributed to HO oxidation in bulk solution and surface oxidation: Effect of activated carbon dosage and pH
Linlin Xing,Yongbing Xie,Daisuke Minakat,Hongbin Cao,Jiadong Xiao,Yi Zhang and John C. Crittenden. Activated carbon enhanced ozonation of oxalate attributed to HO oxidation in bulk solution and surface oxidation: Effect of activated carbon dosage and pH[J]. Journal of environmental sciences (China), 2014, 26(10): 2095-2105. DOI: 10.1016/j.jes.2014.08.009
National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing 100190, China;Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;Beijing Engineering Research Center of Process Pollution Control, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China;National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing 100190, China;Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;Beijing Engineering Research Center of Process Pollution Control, Beijing 100190, China;Department of Civil and Environmental Engineering, Michigan Technological University, Houghton, MI 49931, United States;National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing 100190, China;Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;Beijing Engineering Research Center of Process Pollution Control, Beijing 100190, China;National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing 100190, China;Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;Beijing Engineering Research Center of Process Pollution Control, Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China;National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing 100190, China;Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;Beijing Engineering Research Center of Process Pollution Control, Beijing 100190, China;School of Civil and Environmental Engineering, Brook Byers Institute for Sustainable Systems, Georgia Institute of Technology, Atlanta, GA 30332, United States
Abstract:
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 oxalatewas studied.We found that the removal of oxalatewas reduced by tert-butyl alcohol (tBA)with lowdosages 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 HOU in bulk solution and oxidation on the AC surface both contribute to the removal of oxalate. HOU oxidation in bulk solution is significantwhen the dosage of AC is low,whereas surface oxidation isdominantwhenthedosageofAC ishigh.Theoxalate removaldecreasedwith increasingpHof 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 throughHOU oxidation in basic bulk solution.A mechanism involving both HOU oxidation in bulk solution and surface oxidation was proposed for AC enhanced ozonation of oxalate.
