Pt掺杂介孔TiO_2/导电碳毡光电极的制备及光电催化性能

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。

Preparation and photoelectrocatalysis performance of Pt doped mesoporous TiO2/conductive carbon felt photoelectrode

Based on employing the TiCl₄, cetyltrimethyl ammonium bromide, chloroplatinic acid and conductive carbon felt as titanium source, template agent, doping-ion and carrier, respectively, the precursor solution of liquid crystal-Pt ion-inorganic titanium was prepared by hydrothermal synthesis method. The photoelectrode of Pt doped mesoporous TiO₂/conductive carbon felt (TiO₂-Pt/CCF) was obtained by the dip-coating method with the aid of ultrasonic system under nitrogen protection. The obtained TiO₂-Pt/CCF was characterized by modern analytical tools. The photoelectrocatalytic performance of material was analyzed by degradation of benzaldehyde, and the photoelectrocatalytic synergistic mechanism was analyzed. The results show that the mesoporous processing can increase the specific surface area of TiO₂-Pt/CCF, enlarge the degradation reaction area, and increase the concentration of catalyst surface degradation product; the metal ion doping can bring impurity level, reduce the band gap of TiO₂, at the same time, Pt acts as a photo-electron and hole trap, and inhibits the electron and hole recombine, improves the photoelectrocatalytic activity of TiO₂-Pt/CCF; the TiO₂ loading can enhance the absorption and the surface electron transfer of target degradation product. Under the multilateral collaborative modified, TiO₂-Pt/CCF has higher catalytic activity than noporous TiO₂/CCF and mesoporous TiO₂/CCF.