介孔二氧化钛/导电碳毡光电极的制备及光电催化性能  

Preparation and Photoelectrocatalytic Performance of Mesoporous Titanium Dioxide / Conductive Carbon Felt Electrode

作　　者：李铭[1] 李佑稷[1] 徐鹏[1] 林晓[1] 韩文轩[1] 

机构地区：[1]吉首大学化学化工学院,吉首416000

出　　处：《高等学校化学学报》2015年第8期1596-1605,共10页Chemical Journal of Chinese Universities

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

摘　　要：以四氯化钛为无机钛源,十六烷基三甲基溴化铵为模板剂,通过水热合成法制得无机物钛前驱体溶液.以导电碳毡(CCF)为载体,在超声波辅助下用浸渍提拉法负载钛前驱体,通过高温煅烧得到介孔二氧化钛/导电碳毡(MPT/CCF)光电极材料,对样品的结构进行了表征,并以室内污染物气相苯甲醛为目标降解物,通过评价不同煅烧温度和不同负载次数下MPT/CCF的光电催化性能优化了MPT/CCF的制备工艺条件,探讨了催化降解条件(温度、湿度、偏电压)对协同增效机制的影响.结果表明,相对于纯介孔二氧化钛(MPT),MPT/CCF具有较小的粒径尺寸、更大的比表面积和较均匀的孔径分布,这归功于CCF对晶粒生长的抑制作用.其中负载2次MPT并在500℃下煅烧的2-MPT/CCF-500样品具有最高的光电催化活性,主要是由于其具有完善的晶型、均匀的介孔分布和高浓度的羟基自由基,并且在重复使用过程中也具有很高的光电催化活性.最佳的催化条件为温度35℃、相对湿度55%、偏电压10 V.Based on employing the titanium tetrachloride and hexadecyl trimethyl ammonium bromide as inorganic titanium source and template agent,respectively,an inorganic titanium precursor solution was prepared by hydrothermal method. Mesoporous titania / conductive carbon felt electrode material（ MPT / CCF）was obtained by the dip-coating method with the aid of ultrasonic system with CCF as a carrier. The material was characterized by X-ray diffraction（ XRD）,Raman spectrometry,X-ray photoelectron spectroscopy（ XPS）,scanning electron microscopy（ SEM）,transmission electronic microscopy（ TEM）,Fourier transform infrared spectroscopy（ FTIR） and nitrogen adsorption-desorption. By using benzaldehyde gas as the target degradation product,the photoelectrocatalytic performance of MPT / CCF was discussed under ultraviolet light irradiation.And the effects of the catalytic degradation conditions（ temperature,humidity,bias voltage） on synergies mechanism were discussed. The results show that the MPT / CCF have smaller particle size,larger specific surface area and uniform pore size distribution in comparsion to pure MPT,due to the inhibitory effect of CCF on grain growth. In addition,2-MPT / CCF-500 have the highest photoelectrocatalytic activity due to perfect crystal shape,homogeneous mesoporous structure and high concentrations of hydroxyl radicals. Furthermore,it also has the very high photoelectric catalytic activity in the process of repeated use. The optimum catalytic condition is 55% of humidity and 10 V of bias voltage at 35 ℃.

关 键 词：介孔二氧化钛 导电碳毡 光电催化 苯甲醛 

分 类 号：O643[理学—物理化学]