简单浸渍法制备纳米CuO/TiO_2及其光催化剂活性

Photocatalytic activity of nano-CuO/TiO_2 composites prepared by a simple impregnated method

以Cu(NO3)2·3H2O和P25为前躯体,通过简单浸渍法制备了CuO/TiO2光催化剂,利用N2物理吸附、XRD、TEM、UV-vis漫反射光谱分析了催化剂的结构特性。研究了Cu组分的负载量、催化剂在反应液中的分散量、催化剂焙烧温度、反应液中甲醇浓度对CuO/TiO2光催化反应产氢活性的影响,并考察了催化剂的稳定性,提出了该体系光催化反应的机理。结果表明,Cu的适宜负载量为2.0%～7.5%(质量分数),在Cu质量分数2.0%、催化剂焙烧温度350℃、甲醇的体积浓度为10%、催化剂分散量为1.0 g/L时,产氢活性可达到1 022μmol/(h.g),并且该催化剂具有较好的稳定性。

CuO/TiO2 composites were prepared by a simple impregnated method with Cu（NO3）2·3H2O and P25 as precursors.The characteristic of photocatalysts were analyzed by N2-physisorption,XRD,TEM,UV-vis DRS spectra.In this paper,the effects of Cu content,the scattered catalyst amount,calcination temperature of the photocatalyst and methanol concentration for the photocatalytic activity of CuO/TiO2 composites were studied.We also investigated the stability of the catalyst and proposed a mechanism of the photocatalytic process.The results suggested that the appropriate content of Cu component in CuO/TiO2 is 2.0%～7.5% and hydrogen production rate can reach 1 022 μmol/（h·g） at 2.0% of Cu content,10% of methanol concentration,350 ℃ of calcination temperature and 1.0 g/L of scattered catalyst amount.It was also demonstrated that CuO/TiO2 photocatalyst had a stable activity for H2 evolution.