微孔TiO2负载Pt吸附强化矿化甲苯的性能

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 m2·g-1）微孔TiO2材料，以其为载体构建了微孔TiO2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TiO2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TiO2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Pt-TiO2的常温催化过程。

Performance of Pt doped microporous TiO2 for adsorption-enhanced mineralization of toluene

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 m2·g-1) microporous TiO2 was prepared. We constructed an adsorption-enhanced-photocatalysis binary architecture between the microporous TiO2 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 TiO2 exhibited outstanding adsorption and catalytic capabilities. The equilibrium adsorption amount and mineralization rates of toluene over Pt-doped microporous TiO2 were 3.8 to 4.1 and 2.6 to 2.9 times those of P25,respectively. As a support,microporous TiO2 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.