Fe^(3+)掺杂纳米TiO_2光催化剂的制备及其光催化性能研究

Preparation and performance of photo-catalyst composed of nano-sized TiO_2 doped with Fe^(3+)

以十六烷基三甲基溴化铵(CTAB)为表面活性剂,正丁醇为助表面活性剂,环己烷为油相,采用微乳液法制备出Fe3+掺杂纳米TiO2,用X-射线衍射(XRD)对纳米TiO2粒径、物相等方面进行了表征。通过光催化降解甲基橙溶液考察了TiO2的光催化性能。甲基橙降解实验结果表明,溶液的pH=2时降解率可达100%;掺杂Fe3+会影响TiO2光催化性能,n(Ti4+)∶n(Fe3+)=1∶0.000 4的TiO2在前10 min降解率高达54.50%,60 min降解率可达93.33%,掺杂浓度增大到一定程度后,降解率反而下降,说明存在较佳掺杂浓度。另外,溶液初始浓度对TiO2光催化性能有一定的影响。

Photo- catalyst composed of nano- sized TiO2 doped with Fe^3＋ was prepared by microemulsion method using cetyhrimethylammonium bromide as surfactant,n - butanol as co - surfactant and cyclohexane as oil phase. The particle of TiO2 and the phase structure were identified by X - ray diffraction. Photo - catalytic performance of the catalyst was examined by the photo - catalytic degradation of methyl orange solution. Laboratory results showed that under condition of pH = 2, the degradation can achieve 100%. The doping of Fe^3 ＋ will affect the photo - catalytic performance. Under condition of n （ Ti^4＋ ） ： n （ Fe^3＋） = 1 ： 0. 000 4, the degradation after 10 min achieves 54.50% ,and the degradation after 60 rain achieves 93.33%. However, the degradation declines when the doping concentration increases to a certain extent. It indicates that there is an optimum doping concentration. Besides,the initial concentration of methyl orange solution has a certain effect on the catalytic performance.