采用微波辅助条件下的溶胶-凝胶法制备了煤渣负载纳米TiO2光催化剂.X射线衍射仪、扫描电镜表征结果表明,所负载的TiO2为锐钛矿型,平均粒径12 nm.以亚甲基蓝为目标降解物,着重考察了不同煤渣含量、烧结温度、微波时间、微波功率对其催化性能影响结果表明,煤渣含量32.49%,微波时间为5 min,微波功率为400 W,马沸炉温度为400 ℃时制备的催化剂,催化亚甲基蓝光TiO2/煤渣复合材料降解效果最好.在搅拌条件下该催化剂催化的光降解反应符合一级动力学方程.
This thesis focused on the preparation and application of the cinder-supported nanometer TiO2 photocatalyst by sol-gel technique under the microwave-assisted conditions.The cinder-supported catalysts characterized by XRD and SEM were consisted of anatase titan TiO2 with an average size of 12 nm.By taking methylene blue as the degradation targets, the effect of cinder content, sintering temperature, microwave time and microwave power on the photocatalytic performance of coal cinder-supported titanium dioxide composites was investigated.The results showed that when the percentage content of cinders, microwave-time, microwave-power, muffle furnace temperature were 32.49%, 5 min, 400 W, 400 ℃, respectively, the coal cinder-supported titanium dioxide composites showed the best effect of degradation on methylene blue.In addition, the dynamic response obeyed pseudo-first-order kinetics equation.
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