纳米TiO_2/硅藻土复合材料光催化降解作用研究  

Photocatalytic Performance of Nano-TiO_2/Diatomite Composite

作　　者：张广心[1] 董雄波 郑水林[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《无机材料学报》2016年第4期407-412,共6页Journal of Inorganic Materials

基　　金：国家"十二五"科技支撑计划重点项目(2011BAB03B07)~~

摘　　要：以硅藻土为载体,四氯化钛为前驱体,采用水解沉淀法制备了纳米Ti O2/硅藻土复合材料。结合XRD、SEM、氮气吸脱附等表征手段,探究了复合材料对罗丹明B的光催化性能,对影响复合材料光催化性能的因素进行了研究。结果表明:锐钛矿型纳米Ti O2以团聚体和分散状负载于硅藻土表面。催化剂用量、染料溶液p H、无机离子、光照强度等因素都会在不同程度上影响Ti O2/硅藻土复合材料的光催化性能。在染料初始浓度为10 mg/L,催化剂用量1.0 g/L,紫外光强度为300 W,光照60 min的条件下,罗丹明B光催化降解率达到99.8%。Nano-Ti O2/diatomite composite was synthesized by hydrolysis-deposition method using diatomite as supporter and titanium tetrachloride as precursor. The prepared composite was characterized by X-ray diffraction, scanning electron microscopy and N2 adsorption-desorption. The photocatalytic property of composite was determined by Rhodamine B as a target pollutant. The effects of various parameters that affect the photocatalytic properties of composite were studied. The results show that anatase Ti O2 loaded on the surface of diatomite in agglomerate and disperse states. The catalyst dosage, dye solution p H, inorganic ions and illumination intensity could affect the photocatalytic activity of Ti O2/diatomite composite in different degrees. The photocatalytic degradation rate of Rhodamine B was up to 99.8% under the conditions as follows： 10 mg/L initial dye concentration, 1.0 g/L catalyst dosage, 300 W UV light intensity, and 60 min illumination time.

关 键 词：TiO2/硅藻土 XRD 光催化 罗丹明B 

分 类 号：TQ174[化学工程—陶瓷工业]