微孔TiO_2负载Pt吸附强化矿化甲苯的性能

Performance of Pt doped microporous TiO_2 for adsorption-enhanced mineralization of toluene

矿化效率不足是光催化技术应用于挥发性有机化合物(VOCS)净化的关键限制因素之一。为了提高VOCs的矿化效率,制备了高比表面(736 m^2·g^(-1))微孔TiO_2材料以其为载体构建了微孔TiO_2与Pt的吸附强化光催化二元结构体系。采用比表面积(BET)、透射电镜(TEM)、X射线光电子能谱(XPS)等方法考察材料结构,并以甲苯为VOCs代表研究材料的吸附-光催化特性。结果表明,Pt修饰微孔TiO_2表现出特异的吸附和催化能力,甲苯平衡吸附量和矿化效率分别是P25的3.8·4.1倍和2.6·2.9倍。微孔TiO_2载体除了吸附强化作用外,其表面通过Pt修饰可产生大量表面羟基,从而利于PtTiO_2的常温催化过程。

Insufficient mineralization efficiency is a limiting factor for the application of photocatalytic technology for volatile organic compounds（VOCs） purification.To improve the mineralization efficiency of VOCs,high-surface-area（736 m-2·g-（-1）） microporous TiO_2 was prepared.We constructed an adsorption-enhanced-photocatalysis binary architecture between the microporous TiO_2 and Pt.Brunauer-Emmett-Teller（BET） analysis,transmission electron microscopy（TEM）,X-ray photoelectron spectroscopy（XPS）,and other methods were used to characterize the structures of the prepared materials.Toluene was chosen as a representative VOC for analyzing the adsorption-photocatalysis performance of the materials.The results showed that Pt-doped microporous TiO_2 exhibited outstanding adsorption and catalytic capabilities.The equilibrium adsorption amount and mineralization rates of toluene over Pt-doped microporous TiO_2 were 3.8 to 4.1 and 2.6 to 2.9 times those of P25,respectively.As a support,microporous TiO_2 enhanced the toluene adsorption.Furthermore,its surface provides a large number of surface hydroxyl groups after Pt deposition,facilitating the catalytic process at room temperature.