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Preparation of SO42--H3PW12O40/TiO2(P123) and It’s Photocatalytic Activity for Dinitrotoluene Decomposition |
SHANG Hairu1, LIU Xia2, FENG Changgen1 |
1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;
2. College of Science, China Agricultural University, Beijing 100193, China |
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Abstract: Mesoporous materials SO42--H3PW12O40 /TiO2(P123)were synthesized by combining sol-gel technology and solvothermal treatment. Nitrogen adsorption-desorption analysis and Scanning Electron Microscopy (SEM) results suggest that the specific surface area of SO42--H3PW12O40 /TiO2(2gP123)is 211m2/g, which is five times higher than that of pure TiO2. The average particle size of composite catalyst decreases obviously. Results of ultraviolet-visible absorption spectra (UV-Vis) show that, compared with pure TiO2, an obvious redshift of composite catalysts was observed and the absorption intensity of the band increased significantly. By means of the orthogonal design method of L16(45), the influence of various operating parameters on the dinitrotoluene (DNT) degradation were investigated, including H3PW12O40 loadings, dosage of template agent P123, initial pH value of the solution, catalyst dosage and the concentration of H2SO4, then the intuitionistic analysis and variance analysis were performed. Kinetics results show that the photocatalytic degradation of DNT fits the apparent first-order reaction. The conversion of DNT reached 98.7% after xenon lamp irradiating for 4h under optimum operating conditions: 1.2g/L catalyst dosage, 20%H3PW12O40 loading, 2g dosage of P123, pH value 2 and 1mol/L H2SO4. The half-life of DNT degradation is 0.7162h. The experimental results demonstrate that the photocatalytic effect is good.
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Received: 21 June 2013
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