CeO2－活性炭催化臭氧化降解水中草酸的研究

摘要

利用CeO2的储氧和释氧能力，以高活性的活性炭作为催化剂载体，采用等体积浸渍法制备CeO2－活性炭催化剂。分别用氮气低温吸附/脱附、XRD、XPS对CeO2－活性炭催化剂进行表征。以CeO2－活性炭作为催化剂，草酸作为模型化合物，催化臭氧化降解草酸的去除率达到77%。Ce组分的加入能显著提高草酸的去除率。Ce不仅能够提高反应体系中羟基自由基的浓度，还有利于O3分子直接氧化草酸。 CeO2－活性炭催化剂经过3次重复使用后，草酸去除率保持在70%以上，具有较好的稳定性。%Utilizing the oxygen storage and oxygen release capacities of CeO2,and using activated carbon with high activity as catalyst carriers,CeO2-activated carbon catalyst has been prepared by isometric impregnation method. N2 low temperature adsorption/desorption,XRD and XPS are used respectively for its characterization. Using CeO2-ac-tivated carbon(CeO2-AC) as catalyst,oxalic acid as model compound,the removing rate of oxalic acid degraded by catalytic ozonation reaches 77%. Adding Ce component can improve the removing rate of oxalic acid obviously. Ce can not only improve the concentration of hydroxyl radicals in the reaction system ,but also is advantageous to oxalic acid to be oxidized directly by O3 molecules. After CeO2-AC has been used three times repeatedly,the removing rate of oxalic acid stays at above 70%,having better stability.