Heterogeneous Photocatalytic Mineralization of Chlorobenzene by Paratungstate-loaded Titania Catalysts in an Aqueous Medium

Abstract

Abstract: Paratungstate-loaded titania catalysts were prepared via the addition of a series of aqueous solutions of paratungstate(denoted as W₇) into an isopropanol solution of Ti[OCH(CH₃)₂]₄ by means of the sol-gel method. The catalysts were characterized by EDX, BET, FTIR, UV-Vis DRS, XRD and the results indicate that such paratungstate-loaded catalysts maintained their heptatungstate structure in the anatase titania matrix up to 400 ℃. The catalysts were tested for the heterogeneous photodegradation of chlorobenzene in aqueous media and showed a better catalytic activity than P-25 TiO₂ because paratungstate can prevent the recombination of the holes and electrons produced during irradiation. Moreover, the paratungstate-loaded titania catalysts can resist the disaggregation during the photoirradiation and can be easily recycled from the aqueous suspensions after reactions.

Key words: Photocatalysis, Paratungstate, Titania, Mineralization, Chlorobenzene

YUE Bin, JIANG Lei, HU Chang-wen, CHEN Jian-min, HE He-yong. Heterogeneous Photocatalytic Mineralization of Chlorobenzene by Paratungstate-loaded Titania Catalysts in an Aqueous Medium[J]. Chemical Research in Chinese Universities, 2005, 21(4): 386-390.

References

[1] Ollis D. F., Eds.:Al-Ekabi H., Photocatalytic Purification and Treatment of Water and Air, Elsevier Science Pulishers, Amsterdam, 1993, 353 [2] Hoffmann M. R., Martin S. T., Choi W., et al., Chem. Rev., 1995, 95, 69 [3] Chester G., Anderson M., Read H., J. Photochem. Photobiol., 1993, 71A, 291 [4] Zhang Y., Crittenden J. C., Hand D. W., et al., Environ. Sci. Technol., 1994, 28, 435 [5] Byrne J. A., Eggins B. R., Brown N. M. D., et al., Appl. Catal., 1998, 17B, 25 [6] Tennakone K., Kottegoda I. R. M., J. Photochem. Photobiol., 1996, 93A, 79 [7] Loddo V., Marc G., Martn C., et al., Appl. Catal., 1999, 20B, 29 [8] Matthews R. W., McEvoy S. R., J. Photochem. Photobiol., 1992, 6A, 231 [9] Carraway E. R., Hoffmann A. J., Hoffmann M. R., Environ. Sci. Technol., 1994, 28, 786 [10] Kozhevnikov I. V., Chem. Rev., 1998, 98, 171 [11] Renneke R. F., Kadkhodayan M., Pasquali M., et al., J. Am. Chem. Soc., 1991, 113, 8510 [12] Hu C., Yue B., Yamase T., Appl. Catal., 2000, 194-195A, 99 [13] Einaga H., Misono M., Bull. Chem. Soc. Jpn., 1997, 70, 1551 [14] Mylonas A., Papaconstantinou E., J. Mol. Catal., 1994, 92, 261 [15] Einaga H., Misono M., Bull. Chem. Soc. Jpn., 1996, 69, 3435 [16] Yue B., Zhou Y., Xu J., et al., Environ. Sci. Technol., 2002, 36, 1325 [17] Tytko K. H., Glemser O., Adv. Inorg. Chem. Radiochem., 1976, 19, 239 [18] Matthews R. W., Abdullah M., Low G. K. C., Anal. Chim. Acta, 1990, 233, 171 [19] Reztsova T., Chang C. H., Koresh J., et al., J. Catal., 1999, 185, 223 [20] Hartl H., Palm R., Fuchs J., Angew. Chem., 1993, 32, 1492 [21] Spurr R. A., Myers H., Anal. Chem., 1957, 29, 760 [22] Yamase T., Inorg. Chim. Acta, 1983, 76, L25 [23] Serpone N., Pelizzetti E., Photocatalysis Fundamentals and Application, Wiley, New York, 1989, 650 [24] Serpone N., Khairutdinov R. F., Stud. Surf. Sci. Catal., 1997, 103, 417 [25] Graetzel M., Thampi K. R., Kiwi J., J. Phys. Chem., 1989, 93, 4128 [26] Yang Y., Guo Y., Hu C., et al., Appl. Catal., 2004, 273A, 201 [27] Hiskia A., Papaconstantinou E., Inorg. Chem., 1992, 31, 163 [28] Bielski B. H. J., J. Photochem. Photobiol., 1978, 28, 645 [29] Jacob N., Balakrishnan I., Reddy M. P., J. Phys. Chem., 1977, 81, 17 [30] Matthews R. W., J. Catal., 1988, 111, 264