多孔TiO_2的合成条件对其光催化性能的影响

Effects of Synthesis Conditions of Porous TiO_2 on its Photocatalytic Activities

利用微波辅助水热法,以十八胺作为软模板合成了多孔TiO2;对多孔的TiO2进行XRD、N2吸附脱咐等温曲线、比表面积的表征。研究了超声波的能量、温度、硝酸的浓度对多孔结构形成的影响;并以甲苯为目标污染物,考察了合成的多孔TiO2在紫外光下的光催化活性。结果表明,多孔TiO2的光催化活性要比无孔道结构的TiO2的光催化活性高。

Porous TiO2 were synthesized by the ultrasonic-assisted hydrothermal method. Octadecylamine was used as a soft template to induce the formation of porous structure. The as-prepared porous TiO2 was characterized by the methods of low angle and wide angle X-ray diffraction, N2 adsorption-desorption isotherms and BET surface area. The influence of the energy of ultrasound and heat and the concentration of nitric acid for post extraction on formation of porous structure were investigated. The photocatalytic activities of as-prepared porous TiO2 were investigated by degrading toluene gas under UV light. The results showed that the photocatalytic activities of TiO2 with porous structure are higher than those of non-porous ones.