Preparation of SO42--H3PW12O40/TiO2(P123) and It&rsquo;s Photocatalytic Activity for Dinitrotoluene Decomposition

SHANG Hairu; LIU Xia; FENG Changgen

doi:10.3981/j.issn.1000-7857.2013.36.002

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Science & Technology Review ›› 2013, Vol. 31 ›› Issue (36) : 20-25. DOI: 10.3981/j.issn.1000-7857.2013.36.002

Articles

Preparation of SO₄^2--H₃PW₁₂O₄₀/TiO₂(P123) and It’s Photocatalytic Activity for Dinitrotoluene Decomposition

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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

Abstract

Mesoporous materials SO₄^2--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 SO₄^2--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.

Key words

polyoxometalates / titanium dioxide / photocatalytic / dinitrotoluene / orthogonal design

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SHANG Hairu, LIU Xia, FENG Changgen. Preparation of SO₄^2--H₃PW₁₂O₄₀/TiO₂(P123) and It’s Photocatalytic Activity for Dinitrotoluene Decomposition[J]. Science & Technology Review, 2013, 31(36): 20-25 https://doi.org/10.3981/j.issn.1000-7857.2013.36.002

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