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火焰CVD法合成纳米TiO2及光催化降解罗丹明B的动力学研究
引用本文:陈胜文,秦敏敏,杨玲琳,居 垄,谢洪勇.火焰CVD法合成纳米TiO2及光催化降解罗丹明B的动力学研究[J].上海第二工业大学学报,2011,28(4):280-286.
作者姓名:陈胜文  秦敏敏  杨玲琳  居 垄  谢洪勇
作者单位:上海第二工业大学城市建设与环境工程学院,上海,201209
基金项目:上海市教育委员会重点学科建设项目资助
摘    要:以TiCl4、工业丙烷、空气等为原料,采用火焰CVD的方法合成纳米TiO2并进行了材料表征;将TiO2应用于光催化降解染料罗丹明B并与商品化产品P25进行了比较。由XRD结果表明火焰CVD法合成的TiO2是由金红石和锐钛矿混合晶型组成,锐钛矿晶型占40%;在本实验条件下火焰CVD合成的TiO2光催化罗丹明B的速率比商品化P25快,降解过程符合假一级动力学,其起始速率随罗丹明B浓度的增加而增加,而表观速率常数则降低。在本实验分析条件下,罗丹明B有一主要产物,为N-乙基脱除产物罗丹明,浓度随着光照时间先增大而后减小。

关 键 词:纳米TiO2  火焰CVD  罗丹明B  光降解  动力学

Nanoscale TiO2 Powders Synthesized by Flame CVD Process and Their Photodegradation of Rhodamine B
CHEN Sheng-wen,QIN Min-min,YANG Ling-lin,JU Long,XIE Hong-yong.Nanoscale TiO2 Powders Synthesized by Flame CVD Process and Their Photodegradation of Rhodamine B[J].Journal of Shanghai Second Polytechnic University,2011,28(4):280-286.
Authors:CHEN Sheng-wen  QIN Min-min  YANG Ling-lin  JU Long  XIE Hong-yong
Affiliation:(School of Urban Development and Environmental Engineering, Shanghai Second Polytechnic University, Shanghai 201209, P. R. China)
Abstract:Nanoscale titania (TiO2) powders have been prepared in propane/air diffusion flame with TiCL4. XRD patterns show that the as prepared TiO2 was composed of anatase and rutile with rutile mass fraction of about 40 %. The average particle size is 30-50 nm. The photocatalytic activity of TiO2 on Rhodamine B was studied in aqueous solution. It was revealed that the photocatalytie activity of the TiO2 was better than P25 in this condition. The degradation process followed the pseudo-first-order reaction. The initial rate increases with the increase of Rhodamine B and the appearance rate constant decrease with the increase of Rhodamine B. The major intermediate in the degradation of Rhodamine B was Rhomodamine, which was a process of the N-deethylation of Rhodamine B, concentration of which increased and then decreased.
Keywords:nanoscale TiO2  flame CVD  Rhodamine B  photodegradation  catalytic kinetic
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