氮硫共掺杂TiO_2的光电荷分离效应及其光催化性能研究  

Photo-induced charge separation and photocatalytic performance of N-S co-doped TiO_2

作　　者：陈久福[1] 钟俊波[1] 李建章[1] 窦琳[1] 程朝柱 

机构地区：[1]绿色催化四川省高校重点实验室四川理工学院化学与制药工程学院,四川自贡643000

出　　处：《化学研究与应用》2015年第6期923-928,共6页Chemical Research and Application

基　　金：四川理工学院校级科研基金(2012KY11)资助;绿色催化四川省高校重点实验室开放课题(LYJ14203;LZJ1301)资助;四川理工学院研究生创新基金项目(Y2013025)资助

摘　　要：以硫脲为掺杂剂,采用溶胶-凝胶法制备了氮硫共掺杂TiO2(N,S-TiO2)。用比表面孔隙仪(BET)、X射线衍射仪(XRD)、紫外-可见漫反射(UV-Vis DRS)和X射线光电子能谱(XPS)对制备的光催化剂进行了表征,用表面光电压仪(SPS)和捕获剂研究了光催化剂的光生电荷分离效应。以甲基橙为模拟污染物,在模拟自然光照射下考察了样品的光催化性能。结果表明:硫脲/Ti的摩尔比为30%所制备氮硫共掺杂TiO2具有较高的光催化活性,光催化活性是纯TiO2的5倍。氮硫共掺杂使TiO2具有更高的比表面和光生电荷分离效应,从而有利于提高光催化活性。N-S co-doped anatase TiO2 photocatalyst was successfully prepared by a sol-gel method using thiourea as dopant.The assynthesized photocatalysts were characterized by Brunauer-Emmett-Teller（BET） method,X-ray diffraction（XRD）,UV-Vis diffuse reflectance spectroscopy（UV-Vis DRS） and X-ray photoelectron spectroscopy（XPS）.The separation efficiency of photo-generated charges carriers of photocatalyst was investigated using scavenger and surface photovoltage spectroscopy（SPS）.The photocatalytic performance of the samples was investigated by utilizing decolorization of methyl orange（MO） aqueous solution under simulated solar light irradiation.The result showed that 30 N,S-TiO2 had the higher photocatalytic under the simulated natural light illumination and the photocatalytic activity of 30 N,S-TiO2 was five times of that of TiO2.The enhanced photocatalytic activity of the as-synthesized N,S-TiO2 is mainly attributed to the higher BET surface area and high separation efficiency of photo-induced charger carriers.

关 键 词：TIO2 氮硫共掺杂 电荷分离效应 光催化性能 

分 类 号：TQ013.1[化学工程]