Ti(SO4)2水热法制纳米SO2-4/TiO2光催化剂的光谱研究

以Ti(SO4) 2 水溶液为前驱物 ,尿素为沉淀剂 ,采用水热沉淀 加热分解 浸渍烧结法制备纳米SO2 -4/TiO2 固体超强酸光催化剂 ,并用XRD ,BET ,FTIR ,DRS和FS等对中间态粒子和产物进行表征 ,以光催化降解罗丹明B为模型反应 ,筛选制备SO2 -4/TiO2 光催化剂的优化条件。结果表明 ,用Ti(SO4) 2 为前驱物 ,水热法能在较低的温度、弱碱性介质中 ,得到纳米锐钛矿型TiO2 晶体 ;在 30 0℃下控制焙烧 4h ,基本能使水热反应副产物 (NH4) 2 SO4等分解 ,又避免H2 SO4大量的流失 ;SO2 -4负载量和烧结时间是影响SO2 -4/TiO2 光催化活性的主要因素 ,当SO2 -4负载量 11%、烧结温度 4 5 0℃时 ,制备的SO2 -4/TiO2 光催化剂活性较高 ,达P 2 5光催化剂的水平

Spectral Studies on Nano-sized SO2-4/TiO2 Photocatalyst Prepared by Hydrothermal Heating the Solution of Ti(SO4)2

In this paper, the nano-sized SO4(2-)/TiO2 solid superacid photocatalysts have been prepared by the method of hydrothermal heating the mixed solution of Ti(S04)2 and urea, heating-decomposing, wet impregnating-calcining. The middle products and the ultimate products have been characterized by XRD, BET, FTIR, DRS and FS. The degradation of rhodamine B by photocatalyst was regarded as a model reaction. The optimum condition of preparing SO4(2-)/TiO2 photocatalysts has been chosen. The results show that hydrothermal treating the solution of Ti(SO4)2 can get the anatase nano-sized TiO2 in the weak alkalinity medium; at 300 degrees C by-products of hydrothermal reaction, such as (NH4)2SO4 and so on, can be decomposed by calcining for 4 hours, avoiding much loss of H2SO4; the most important factors that influence the photocatalystic activities of SO4(2-)/TiO2 are the concentration of SO4(2-) on TiO2 and the calcination time. SO4(2-)/TiO2 photocatalysts have the best photocatalystic activities, up to the level of P-25 photocatalyst, when the concentration of SO4(2-) on TiO2 is 11% and the calcination temperature is 450 degrees C.