以钛酸丁酯为前驱体,封堵的火山岩为载体,通过超临界CO2辅助制备了TiO2外负载火山岩复合体,并将其用于光催化降解亚甲基蓝反应,考察了溶液pH值及催化剂浓度对反应性能的影响.结果表明,TiO2外负载火山岩复合体的光催化性能优于纯TiO2和TiO2体负载火山岩复合体.这是由于外负载复合体对亚甲基蓝的高吸附性、小晶粒尺寸的TiO2颗粒以及吸附和光催化降解间的协同效应.亚甲基蓝浓度为1.5mg/L,溶液pH为8,催化剂浓度为6.8mg/L时,外负载TiO2火山岩复合体上亚甲基蓝降解速率最高,且使用后的催化剂仍具有高的光催化活性.
Cost-effective TiO2-outerloaded lava composites (TOLs) were prepared using supercritical CO2 and sealing lava as well as tetrabutyi titanate as a support and a precursor,respectively.The important factors affecting methylene blue (MB) oxidation efficiency were investigated including the initial concentration of MB,the pH,and catalyst concentration.The results show that TOLs have a higher degradation efficiency than pure TiO2 and TiO2-loaded lava composites (TLLs) because of the high adsorption capacity of MB and the small crystalline size of the TiO2 particles in addition to a synergetic effect for adsorption and photocatalytic degradation.The optimum conditions were a MB concentration of 1.5 mg/L at pH 8 with a TOLs concentration of 6.8mg/L for the fastest MB degradation.Additionally,the used TOLs retained high activity for MB photocatalytic degradation.
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