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Photocatalytic Degradation of Acetaldehyde on Mesoporous TiO2: E?ects of Surface Area and Crystallinity on the Photocatalytic Activity
Xiao-xing Fan1,2,3, Tao Yu*1,4, Yin Wang1,2,3, Lin Gao1,2,3, Li-zhi Zhang1,2,3, Xin-yi Chen1,2,3, Zhi-gang Zou1,4
1.Eco-materials and Renewable Energy Research Center, Department of Physics, Nanjing University, Nanjing 210093, China;2.Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;3.National Laboratory of Solid State Microstru;4.Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, China Central Normal University, Wuhan 4300
Abstract:
"Mesoporous TiO2 powder and films with worm-like channels were synthesized by an evaporation-induced self-assembly approach. The as-prepared samples were calcined at different temperature to investigate the effect of calcined temperature on the mesostructure and the photocatalytic activity. Acetaldehyde photodegradation in gas phase was employed to evaluate the photocatalytic activity of mesoporous TiO2. Results showed that all the calcined powder samples exhibited higher photocatalytic activities than that of Degussa P25. The sample calcined at 400 oC, which showed higher activity than other samples, possessed a homogeneous pore diameter of about 6.0 nm and an 11.0 nm crystalline anatase pore wall, as well as large surface area of 117 m2/g. It was speculated that two factors of surface area and crystallinity affected the photocatalytic activity of mesoporous TiO2 photocatalyst. The mesoporous TiO2 films fabricated by spin-coating also had high photocatalytic activities."
Key words:  Mesoporous TiO2, Photocatalysis, Acetaldehyde, Photodegradation
FundProject:
附件
介孔二氧化钛光催化降解乙醛及其影响因素
范晓星1,2, 于涛*1,3, 王英1, 高玲1, 张礼知4, 陈新益1, 邹志刚1,3
1.南京大学物理系环境材料与再生能源研究中心,南京210093;2.南京大学材料科学与工程系,南京210093;3.南京大学固体微结构国家重点实验室,南京10093;4.南京大学化学化工学院,南京210093
摘要:
"应用溶剂蒸发自组装的方法合成了具有蠕虫状孔道的介孔二氧化钛粉末和薄膜.考察了不同焙烧温度对材料介孔结构和光催化性能的影响.乙醛光催化降解实验用来表征不同焙烧温度下介孔材料的光催化性能.结果表明实验中合成的介孔二氧化钛材料的光催化活性明显高于颗粒二氧化钛(Degussa P25).其中400 oC焙烧的样品具有平均孔径为6.0 nm的窄的孔径分布和117 m2/g的大的比表面积.通过对光催化活性结果的分析,发现介孔二氧化钛的活性主要受其比表面积和结晶性的共同影响.对介孔二氧化钛薄膜材料进行了同样的光催化表
关键词:  介孔,二氧化钛,光催化,乙醛,光降解
DOI:10.1088/1674-0068/20/06/733-738
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