Pt掺杂介孔TiO_2/导电碳毡光电极的制备及光电催化性能  

Preparation and photoelectrocatalysis performance of Pt doped mesoporous TiO_2/conductive carbon felt photoelectrode

作　　者：李铭[1] 李佑稷[1] 林晓[1] 徐鹏[1] 万祖祥 曾剑华[1] 

机构地区：[1]吉首大学化学化工学院,吉首416000

出　　处：《复合材料学报》2016年第12期2893-2904,共12页Acta Materiae Compositae Sinica

基　　金：教育部新世纪优秀人才支撑计划(NCET-12-0720);湖南省自然科学杰出青年基金(13JJ1023);湖南省高校科技创新团队支持计划;研究生创新项目(2014KFXM03)

摘　　要：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。Based on employing the TIC14, 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 TiOz/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 photoelec- trocatalytic 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 cata- lyst 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.

关 键 词：TIO2 PT 掺杂 光电催化 碳毡 

分 类 号：O643[理学—物理化学]