Abstract
The compounds of tetragonal Ba4In2O7 were synthesized by self-propagating combustion synthesis method from raw materials of Ba(NO3)2, In(NO3)3 and Glycine. The effect of synthesis conditions on the formation and photocatalytic activity of the compounds was investigated. The synthesized Ba4In2O7 was characterized by Xray diffraction (XRD), thermogravimetric analysisdifferential thermal analysis (TG-DTA), UV-visible diffuse reflectance spectroscopy (UV-vis DRS) and N2 adsorption-desorption isotherms (BET), respectively. With rhodamine B (RhB) as a model degradation compound, the effect of calcinations temperature (T), calcinations time (t), Ba to In molar ratio (Ba/In), Glycine to metal ion molar ratio(G/M) and the initial concentration of RhB on the photocatalytic activity of Ba4In2O7 was investigated. The results show that the synthetic Ba4In2O7, prepared by conditions of T=800°C, t=1 h, Ba/In= 2∶1 and G/ M=2∶1, has tetragonal structure, higher purity and excellent photocatalytic activity. The RhB (5 mg/L) can be completely decomposed in 3 h under lighting of a high pressure mercury lamp (125 W), and the decolorization rate of RhB can reach 96.5%. The degrading process fits the first-order kinetic model. *国家自然科学基金项目 21276208,陕西省教育厅专项基金 11JK0569,陕西省尾矿资源综合利用重点实验室(商洛学院)开放基金 2014SKYWK003和西安理工大学博士学位论文创新基金207-002J1304资助。 2014年6月16日收到初稿; 2014年7月30日收到修改稿。 本文联系人:姚秉华,教授
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