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Self-propagating Combustion Synthesis of Ba4In2O7 and Its Photocatalytic Activity |
Qinku ZHANG1,2,Binghua YAO1,3,**( ),Chao PENG1,Lukang SUN1 |
1. Department of Applied Chemistry, Xi’an University of Technology, Xi’an 710048, China 2. Department of Building Engineering, Yulin University, Yulin 719000, China 3. Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources (Shangluo University), Shangluo 726000, China |
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Cite this article:
Qinku ZHANG,Binghua YAO,Chao PENG,Lukang SUN. Self-propagating Combustion Synthesis of Ba4In2O7 and Its Photocatalytic Activity. Chinese Journal of Materials Research, 2015, 29(1): 39-44.
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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 X-ray diffraction (XRD), thermogravimetric analysis-differential 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℃, 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.
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Received: 16 June 2014
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Fund: *Supported by National Natural Science Foundation of China No.21276208, Special Research Fund of Education Department of Shaanxi Provincial Government No.11JK0569, and the Research Fund of Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources (Shangluo University) No.2014SKY-WK003 and the Research Fund for Innovation Doctoral Thesis of Xi’an University of Technology No.207-002J1304. |
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