Abstract:In order to develop novel functional materials, CuMn2O4 was modified by graphite C3N4 (g-C3N4) and graphene (rGO). The modified and unmodified CuMn2O4 was characterized by XRD, specific surface area measurement, XPS and impedance test. The degradation efficiency of BP-4 and the elimination efficiency of $ {\rm{BrO}}_3^ - $ were compared. And the relationship between the structure and performance of CuMn2O4 before and after modification was explored. The results showed that BET specific surface area, total pore volume and average pore radius of the two composite catalysts increased. Compared with CuMn2O4, the specific surface area of CuMn2O4/rGO and CuMn2O4/g-C3N4 increased by 17.68 and 5.09 times, respectively. The modification of rGO and g-C3N4 not only increased the oxygen vacancy, but also increased the resistance of the catalyst. Compared with CuMn2O4, the relative content of OV in CuMn2O4/rGO and CuMn2O4/g-C3N4 increased by 2.51 times and 2.74 times, respectively. The resistance of CuMn2O4/rGO and CuMn2O4/g-C3N4 increased by 18.70% and 46.93%, respectively. Compared with CuMn2O4, the degradation rate of BP-4 by CuMn2O4/rGO increased by 5.98 times and the bromate formation yield decreased by 100%. The degradation rate of BP-4 by CuMn2O4/g-C3N4 increased by 5.37 times, and the bromate formation yield couldn’t be reduced further. Thus CuMn2O4/rGO was more suitable for the catalytic ozonation. The above research could provide a guidance for the selection of novel and efficient catalysts in the process of heterogeneous catalytic ozonation. Key words:catalytic ozonation/ CuMn2O4 modification/ graphene/ graphite carbon dioxide/ benzophenone-4/ bromate.
图1臭氧氧化反应装置示意图 Figure1.Schematic diagram of ozone oxidation reactor
图6单独臭氧、CuMn2O4、rGO、g-C3N4、CuMn2O4/rGO和CuMn2O4/g-C3N4催化臭氧氧化对BP-4的降解效果及对BP-4降解的拟一级动力学分析 Figure6.Degradation efficiency of BP-4 and the pseudo first order reaction kinetics of BP-4 degradation by the sole ozonation and CuMn2O4, rGO, g-C3N4, CuMn2O4/rGO and CuMn2O4/g-C3N4 catalytic ozonation
图7单独臭氧氧化及CuMn2O4，g-C3N4，rGO，CuMn2O4/rGO与CuMn2O4/g-C3N4催化臭氧氧化对溴酸盐生成量的影响 Figure7.$ {\rm{BrO}}_3^ - $ yield during the sole ozonation and CuMn2O4, g-C3N4, rGO, CuMn2O4/rGO and CuMn2O4/g-C3N4 catalytic ozonation
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1.Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China 2.College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China Received Date: 2020-05-08 Accepted Date: 2020-06-17 Available Online: 2021-02-22 Keywords:catalytic ozonation/ CuMn2O4 modification/ graphene/ graphite carbon dioxide/ benzophenone-4/ bromate Abstract:In order to develop novel functional materials, CuMn2O4 was modified by graphite C3N4 (g-C3N4) and graphene (rGO). The modified and unmodified CuMn2O4 was characterized by XRD, specific surface area measurement, XPS and impedance test. The degradation efficiency of BP-4 and the elimination efficiency of $ {\rm{BrO}}_3^ - $ were compared. And the relationship between the structure and performance of CuMn2O4 before and after modification was explored. The results showed that BET specific surface area, total pore volume and average pore radius of the two composite catalysts increased. Compared with CuMn2O4, the specific surface area of CuMn2O4/rGO and CuMn2O4/g-C3N4 increased by 17.68 and 5.09 times, respectively. The modification of rGO and g-C3N4 not only increased the oxygen vacancy, but also increased the resistance of the catalyst. Compared with CuMn2O4, the relative content of OV in CuMn2O4/rGO and CuMn2O4/g-C3N4 increased by 2.51 times and 2.74 times, respectively. The resistance of CuMn2O4/rGO and CuMn2O4/g-C3N4 increased by 18.70% and 46.93%, respectively. Compared with CuMn2O4, the degradation rate of BP-4 by CuMn2O4/rGO increased by 5.98 times and the bromate formation yield decreased by 100%. The degradation rate of BP-4 by CuMn2O4/g-C3N4 increased by 5.37 times, and the bromate formation yield couldn’t be reduced further. Thus CuMn2O4/rGO was more suitable for the catalytic ozonation. The above research could provide a guidance for the selection of novel and efficient catalysts in the process of heterogeneous catalytic ozonation.
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