载体形貌对乙酸废水臭氧催化氧化矿化影响

Effect of Support Morphology on Catalytic Ozonation Mineralization of Acetic Acid Wastewater

在有机废水氧化处理过程中常产生乙酸等小分子有机酸,其在羧基的α位上有甲基,难以矿化。研究采用MnO_(2)为活性成分,以不同形貌(粉末状、球状和蜂窝状)γ-Al_(2)O_(3)为载体制备了3种催化剂,考察了室温臭氧气体鼓泡条件下载体形貌对乙酸降解和矿化的影响。结果显示,粉末状、蜂窝状和球状γ-Al_(2)O_(3)载体催化剂的乙酸矿化率分别为89.0%,54.6%,38.7%,能量效率分别为13.7,11.2,7.0 g/(kW·h),说明粉末状γ-Al_(2)O_(3)做载体制得的MnO_(2)催化剂是乙酸矿化的最佳催化剂。

Small molecular organic acids such as acetic acid are often produced in the oxidation treatment of organic wastewater,the acetic acid is difficult to be mineralized due to the presence ofα-position methyl group on the carboxyl group.In this study,three catalysts are prepared from MnO_(2) as the active component andγ-Al_(2)O_(3) with different morphologies(powder,honeycomb and sphere)as the support to investigate the effect of support morphology on MnO_(2) catalytic ozonation mineralization of acetic acid via ozone gas bubbling at room temperature.The results show that using the MnO_(2) catalysts with powder,honeycomb,and sphericalγ-Al_(2)O_(3) supports,the acetic acid mineralization is 89.0%,54.6%,38.7%,and the energy efficiencies are 13.7,11.2,7.0 g/(kW·h),respectively,indicating that the MnO_(2) catalyst with the powderγ-Al_(2)O_(3) support is the best catalyst for acetic acid mineralization.