Ag(Ⅰ)敏化TiO_2的可见光催化性能研究

Study on photocatalytic properties of Ag(Ⅰ) sensitized C-TiO_2

以葡萄糖为模板和碳源,经水热反应和高温煅烧得到碳掺杂介孔TiO_2中空微球(C-TiO_2),并以C-TiO_2为载体,将Ag NO3和Na H2PO4负载到TiO_2介孔孔道中,在光催化过程中原位生成Ag3PO4提高TiO_2的光催化活性。利用XRD、SEM、TEM以及UV-Vis DRS对样品进行表征。以罗丹明B为模拟污染物,对样品在紫外光和可见光下的催化性能进行表征。结果表明,Ag(I)敏化后TiO_2的载银量为5.6%时光催化活性最佳,在紫外光下20 min时降解率为98.6%,可见光下40 min降解率为99.3%。

Carbon-doped mesoporous TiO2 hollow microspheres（ C-TiO2） are prepared by hydrothermal reaction method and calcination method using glucose as template and carbon source. Using the prepared C-TiO2 as supporter,Ag NO3 and Na H2 PO4 are supported into the mesoporous channels of TiO2 and form Ag3 PO4 in-situ during the photocatalytic process,which can improve the photocatalytic activity of TiO2. The Ag（ I） sensitized C-TiO2 samples are characterized by XRD,SEM,TEM,and UV-Vis DRS. The photocatalytic activity of the sensitized samples are evaluated through photocatalytic degradation of simulated contaminant Rhodamine B under ultraviolet light and visible light,respectively. The photocatalytic activity is the best when the content of Ag in Ag（ I） sensitized C-TiO2 is 5. 6%,over which the degradation rate is 98. 6% under the irradiation of ultraviolet light for 20 min and is 99. 3% under the irradiation of visible light for 40 min.