摘要 采用高温聚合有机物前驱体的方法,以三聚氰胺为前驱体,制得类石墨型氮化碳(g-C3N4)粉末,采用水热法制得CeO2/g-C3N4复合光催化剂,对其进行了表征,考察了CeO2/g-C3N4复合光催化剂在可见光下处理亚甲基蓝的性能,并对CeO2/g-C3N4复合光催化剂进行回收实验、吸附实验以及光催化动力学分析。结果表明,CeO2/g-C3N4中g-C3N4和CeO2分别为石墨相和萤石相,复合CeO2使得g-C3N4的吸附性能有了大的提高,15 min能达到吸附平衡,吸附82.5%的亚甲基蓝;45 min后对亚甲基蓝处理率达到99.45%,远远快于g-C3N4。CeO2/g-C3N4在5次使用后仍然可以保持73.1%的净化效果。亚甲基蓝处理过程包括吸附和光解2部分,光解反应符合一级动力学方程。 The method of polymerizing organic precursors at high temperature was used with melamine as the precursor to prepare graphite-like carbon nitride(g-C3N4) powder.The CeO2/g-C3N4 composite photocatalyst was prepared by hydrothermal method.All synthetics were characterized.The treatment performance of the CeO2/g-C3N4 composite photocatalyst on the degradation of methylene blue under visible light was investigated,and the recovery experiment,adsorption experiment and kinetic analysis of CeO2/g-C3N4 composite photocatalyst were carried out.The results showed that,in CeO2/g-C3N4,g-C3N4 and CeO2 were graphite phase and fluorite phase,respectively.The composite CeO2 greatly improves the adsorption performance of g-C3N4.The adsorption equilibrium could be reached in 15 min,and 82.5% of methylene blue could be adsorbed.The treatment rate of methylene blue reached 99.45% by CeO2/g-C3N4 after 45 min,which was much faster than the rate by g-C3N4.CeO2/g-C3N4 could still maintain 73.1% purification effect after five times of reuse.The treatment process of methylene blue by CeO2/g-C3N4 included adsorption and photolysis,and the photolysis reaction conformed to the first-order kinetic equation.
机构地区 江汉大学
出处 《水处理技术》 CAS CSCD 北大核心 2021年第4期52-55,共4页 Technology of Water Treatment
基金 国家自然科学基金项目(21871111) 江汉大学学生科研项目(2018yb230)。
关键词 CeO2/g-C3N4复合光催化剂 吸附 光催化 亚甲基蓝 CeO2/g-C3N4composite photocatalyst adsorption photocatalysis methylene blue
