Andhra University, Department of Inorganic and Analytical Chemistry, Visakhapatnam 530003, Andhra Pradesh, India.
J Hazard Mater. 2011 Feb 28;186(2-3):1234-40. doi: 10.1016/j.jhazmat.2010.11.132. Epub 2010 Dec 8.
Mg-doped TiO(2) with different Mg concentrations were prepared using sol-gel method and characterized by XRD, UV-visible, XPS, SEM and FT-IR. The XRD results revealed that Mg(2+) goes into the TiO(2) lattice. SEM images of the doped and pure TiO(2) indicated that there is a smaller particle size for the doped catalyst compared to that of the pure TiO(2). UV-visible absorption spectra indicated that upon doping with Mg(2+) ion, the catalyst exhibits absorption in visible region. FT-IR and XPS spectra demonstrated that the presence of Mg(2+) ion in the TiO(2) lattice as substitutional dopant. Photocatalytic activity of doped TiO(2) has been evaluated by degradation of the monocrotophos (MCP) pesticide. The effect of solution pH, catalyst dosage and initial concentration of MCP on the photocatalytic activity of Mg-doped TiO(2) with different loadings was studied. It was observed that the rate of degradation of MCP over Mg-doped TiO(2) is better than Pure TiO(2) and Degussa P-25.
采用溶胶-凝胶法制备了不同 Mg 浓度掺杂的 TiO(2)，并通过 XRD、UV-可见、XPS、SEM 和 FT-IR 进行了表征。XRD 结果表明 Mg(2+)进入 TiO(2)晶格。掺杂和纯 TiO(2)的 SEM 图像表明，与纯 TiO(2)相比，掺杂催化剂的粒径较小。紫外可见吸收光谱表明，掺杂 Mg(2+)离子后，催化剂在可见光区有吸收。FT-IR 和 XPS 谱表明，Mg(2+)离子以替位掺杂的形式存在于 TiO(2)晶格中。通过降解单虫磷（MCP）农药评价了掺杂 TiO(2)的光催化活性。研究了溶液 pH 值、催化剂用量和 MCP 初始浓度对不同负载量 Mg 掺杂 TiO(2)光催化活性的影响。结果表明，Mg 掺杂 TiO(2)对 MCP 的降解速率优于纯 TiO(2)和 Degussa P-25。
