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Degradation of p-Toluene Sulfonic Acid Wastewater by Combined Photocatalysis and Ozonization
Corresponding Author(s) : D.L. Li
Asian Journal of Chemistry,
Vol. 25 No. 3 (2013): Vol 25 Issue 3
Abstract
The degradation of low concentration of p-toluene sulphonic acid (p-TSA) in aqueous solution by three photochemical methods (O3, TiO2/UV, TiO2/UV/O3) were compared and the effects of initial pH, p-TSA concentration and ozone dosage on the p-TSA degradation by TiO2/UV/O3 were studied. The results show that the degradation of p-TSA in three processes- O3, TiO2/UV, TiO2/UV/O3, follow the apparent first-order reaction kinetics. The rate constant of TiO2/UV/O3 is larger than sum of those of TiO2/UV and O3, which indicates a synergistic effect of photocatalysis and ozonization. The effect of pH on p-TSA degradation by TiO2/UV/O3 can be ignored. The rate constant decreases with the increase of initial concentration of p-TSA, while the absolute removal amount of p-TSA increase of its initial concentration. The rate constant decreases with the increase of ozone dosage. Small organic molecules are identified as the main intermediate product during p-TSA degradation; and the ultimate products were H2O, CO2, indicating that TiO2/UV/O3 is a safe and effective method to remove p-toluene sulphonic acid.
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References
H. Geim, J. Chemosphere, 28, 2203 (1994).
J.S. Wang, L.H. Zhao and X. Kuang, J. Acta Sci. Circumstant., 15, 407 (1995).
D.L. Li, L. Zhang and X.J. Zhong, Chemistry, 8, 577 (2006). (In Chinese)
J. Hu, J.T. Zhou, A.L. Zhang, S. Yang and Y.M. Li, J. Dalian Univ. Technol., 45, 26 (2005). (In Chinese)
J.X. Lu, P.Y. Zhang and W.J. He, Chinese J. Environ. Engg., 4, 27 (2010). (In Chinese)
R.Vittorio, S. Elena and L.B. Claudia, J. Ultrason. Sonochem., 8, 251 (2001).
X.J. Zhong, L. Zhang and D.L. Li, J. Acta Sci. Circumstant., 27, 1835 (2007). (In Chinese)
G.R. Rip, J. Ozone Sci. Eng., 24, 1 (2002).
M. Addamo, V. Angugliaro and E.L. Garcia, J. Catal. Today, 107, 612 (2005).
S.K. Kansal, M. Singh and D. Sud, J. Hazard. Mater., 141, 581 (2007).
T.E. Agustina, H.M. Ang and V.K. Vareek, J. Photochem. Photobiol. C, 6, 264 (2005).
L.L. Zhou, C.G. Meng and P. Zhou, J. Petrochem. Technol., 36, 739 (2007).
K.L. Shao, J.T. Zhou and H. Lv, Chinese J. Environ. Engg., 7, 1259 (2009). (In Chinese)
Y.K. Wu, Q.P. Jin and M. Shanghai, East China Chemical Engineering College Press, The Technology of Organic Water Pollution Control, pp. 344-362 (1989). (In Chinese)