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。
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.
出处
《上海第二工业大学学报》
2011年第4期280-286,共7页
Journal of Shanghai Polytechnic University
基金
上海市教育委员会重点学科建设项目资助(No.J51803)
