摘要
采用水热/焙烧法合成了铜铈二元复合催化剂(CuO-CeO_(2)),并通过X射线衍射、扫描电子显微镜和透射电子显微镜对其进行了表征。以草酸为模型化合物,应用CuO-CeO_(2)为催化剂进行连续流催化臭氧降解动态试验。结果表明:25 min时草酸去除率达到97.66%,远高于臭氧(2.66%)、CuO/臭氧(7.38%)和CeO_(2)/臭氧(5.47%)反应体系,草酸矿化率为95.21%;CuO-CeO_(2)/臭氧反应体系的最佳反应条件为初始pH=7、臭氧质量浓度30 mg/L、催化剂投加量0.20 g/L;CuO-CeO_(2)经5次循环再用仍可去除90%以上的草酸,具有优良的稳定性和可再用性。CuO-CeO_(2)催化臭氧过程中有羟基自由基的产生但并不起主导作用,单线态氧是导致草酸降解的主要活性氧化种。
CuO-CeO_(2) bimetal oxide catalysts were synthesized by hydrothermal-calcination method.X-ray diffraction,scanning electron microscope and transmission electron microscope were used to characterize the properties of catalysts.With oxalic acid selected as the model compound,continuous flow catalytic ozonation experiments were performed under catalysis of CuO-CeO_(2).The results showed that 97.66%of oxalic acid was removed,which was much higher than that of O_(3)(2.66%),CuO/O_(3)(7.38%)or CeO_(2)/O_(3)(5.47%)at 25 min.Simultaneously,95.21%of oxalic acid was mineralized in this process.The optimal reaction conditions of CuO-CeO_(2)/O_(3) system were initial pH=7,30 mg/L O_(3) and 0.20 g/L CuO-CeO_(2).Over 90%of oxalic acid was removed by CuO-CeO_(2) after 5 cycles,indicating excellent stability and reusability of this catalyst.In the reaction process,hydroxyl radical was produced but not played a predominant role.Singlet oxygen was the main reactive oxygen species leading to the degradation of oxalic acid in the CuO-CeO_(2)/O_(3) system.
作者
李振东
孙艳梅
李士娜
刘东方
李慧婷
LI Zhendong;SUN Yanmei;LI Shina;LIU Dongfang;LI Huiting(Tianjin Research Institute for Water Transport Engineering,M.O.T.,Tianjin 300456;Tianjin Eco-City Water Investment and Construction Co.,Ltd.,Tianjin 300457;College of Environmental Science and Engineering,Nankai University,Tianjin 300350)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2022年第1期33-38,84,共7页
Environmental Pollution & Control
基金
水体污染控制与治理科技重大专项(No.2017ZX07107002)
中央级公益性科研院所基本科研业务费专项资金项目(No.TKS20200311、No.KJFZJJ190201)。
