School of Environmental and Safety Engineering,Liaoning Shihua University
This work was financially supported by the National Water Pollution Control and Management Technology Major Project of China(2012ZX07202-002), the Key Tackling Problems of the Education Department of Liaoning Province,China(L2020003), the Department of Education Project Liaoning Province,China(L2020020).
利用微波辅助双模板法、软模板法制备了一系列的CeO2/g-C3N4复合催化材料,通过XRD、N2吸附-脱附、XPS、SEM和TEM等方式对材料进行表征,并对其湿式催化性能进行研究。结果表明,双模板法制备的D-CeO2/g-C3N4复合材料表现出立方相CeO2和层叠g-C3N4的特征,比表面积和孔径较大,属于介孔结构,表面存在Ce3+和Ce4+,有利于氧空位的形成。加入1 g嵌段共聚物 F127,使用无水乙醇溶液为溶剂,调节混合液呈碱性,微波辐射反应120 min后得到的D-CeO2/g-C3N4(7.5)样品,结构完整均匀,具有最佳形貌特征。控制反应温度75 ℃,D-CeO2/g-C3N4(7.5)投加0.7 g,H2O2投加 0.5 mL,初始pH值为5时,100 mg/L的苯酚溶液COD去除率可达80%以上。 D-CeO2/g-C3N4(7.5) 复合催化材料使用五次以后仍可达60%以上的催化降解效果。
A series of CeO2/g-C3N4 composite catalytic materials were prepared by microwave-assisted double template method and soft template method, and the materials were characterized by XRD, N2 adsorption-desorption, XPS, SEM and TEM, and their wet catalytic properties were investigated. The results showed that the D-CeO2/g-C3N4 composites prepared by the double-template method exhibit the characteristics of cubic-phase CeO2 and laminated g-C3N4, with large specific surface area and pore size, which are mesoporous structures and the presence of Ce3+ and Ce4+ on the surface, which are favorable to the formation of oxygen vacancies. The D-CeO2/g-C3N4(7.5) sample obtained after adding 1 g of block copolymer F127, using anhydrous ethanol solution as the solvent and adjusting the mixture to be alkaline, and microwave radiation reaction for 120 min had a complete and homogeneous structure with the best morphological characteristics. The COD removal rate of 100 mg/L phenol solution could reach more than 80% when the reaction temperature was controlled at 75 ℃, D-CeO2/g-C3N4(7.5) was injected at 0.7 g, H2O2 was injected at 0.5 mL, and the initial pH was 5. The D-CeO2/g-C3N4(7.5) composite catalytic material could still achieve more than 60% catalytic degradation after five times of use.