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以四氯化钛为钛源、十六烷基三甲基溴化铵为模板剂、氯铂酸为掺杂离子、导电碳毡为载体,通过水热合成法制得液晶-Pt离子-无机物钛前驱体溶液,在超声波辅助下采用浸渍提拉法进行负载,在氮气保护下焙烧得到导电碳毡负载铂掺杂介孔TiO_2(TiO_2-Pt/CCF)光电极,利用现代表征手段对材料结构进行表征。以苯甲醛为目标降解物,对材料的光电催化活性进行研究,并分析了光电协同机制。结果表明:介孔化处理提高了TiO_2-Pt/CCF的比表面积,增大了降解反应的有效面积和催化剂表面降解物浓度;金属离子掺杂引入了杂质能级,减小了TiO_2的能带隙,同时,Pt充当着光生电子-空穴捕获阱,阻止电子-空穴对的复合,提高了TiO_2-Pt/CCF的光电催化效率;TiO_2固载化提高了对目标降解物的吸附和表面电子转移。在多功能的协同改性下,TiO_2-Pt/CCF比无孔TiO_2/CCF和介孔TiO_2/CCF有更高的催化活性。
In this paper, liquid crystal-Pt ion-inorganic compounds were prepared by hydrothermal synthesis using titanium tetrachloride as titanium source, cetyltrimethylammonium bromide as templating agent, chloroplatinic acid as doping ion and conductive carbon felt as carrier Titanium precursor solution was impregnated by ultrasonic method and impregnated with a Czochralski method. The porous carbon nanotubes supported on the carbon nanotubes were calcined under nitrogen atmosphere to obtain Pt-doped mesoporous TiO 2 (TiO 2 -Pt / CCF) photoelectrodes. Characterization. With benzaldehyde as the target degradation product, the photoelectrocatalytic activity of the material was studied, and the mechanism of photoelectric synergy was analyzed. The results showed that the mesoporous treatment increased the specific surface area of TiO 2 -Pt / CCF, increased the effective area of degradation reaction and the concentration of catalyst surface degradation products. The doping of metal ions introduced impurity level and decreased the energy band of TiO 2 At the same time, Pt acts as a photogenerated electron-hole trap to prevent recombination of electron-hole pairs and enhances the photoelectrocatalytic efficiency of TiO 2 -Pt / CCF. The immobilization of TiO 2 improves the adsorption and surface of the target degradation products Electron transfer. The TiO 2 -Pt / CCF has higher catalytic activity than non-porous TiO 2 / CCF and mesoporous TiO 2 / CCF under the synergistic modification.