Semiconductor-Mediated Photocatalysed Degradation of Various Pesticide Derivatives and Other Priority Organic Pollutants in Aqueous Suspensions

Abstract:

The photocatalysed degradation of various selected pesticide derivatives, namely N,NDimethyl- a-phenyl benzene acetamide (Diphenamid) [1], 1,2-diethyl phthalate (DEP) [2], 5-bromo- 3-sec.butyl-6-methyl uracil (Bromacil) [3], 3-tert-butyl-5-chloro-6-methyluracil (Terbacil), 2,4,5- tribromoimidazole (TBI) [4], Methoxychlor, Chlorothalonil and Disulfoton [5] as well as that of two selected priority organic pollutants, namely benzidine and 1,2-diphenyhydrazine (DPH) [6], has been investigated in aqueous suspensions of titanium dioxide (TiO2) under a variety of conditions. The degradation was studied by monitoring the change in substrate concentration employing UV spectroscopic analysis or HPLC technique and the decrease in total organic carbon (TOC) content, respectively, as a function of irradiation time. The degradation kinetics was studied under different conditions such as reaction pH, substrate and photocatalyst concentration, type of photocatalysts and the presence of alternative additives such as H2O2, KBrO3 and (NH4)2S2O8 besides molecular oxygen. The degradation rates and the photonic efficiencies were found to be strongly influenced by the above parameters. A toxicity test was performed for irradiated samples of few selected systems measuring the luminescence of bacteria Vibrio fischeri after 30 minutes of incubation.

• Periodical: Materials Science Forum (Volumes 486-487)
• Pages: 61-64
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.486-487.61
• Online since: June 2005
• Authors: Detlef Werner Bahnemann, M. Muneer, M. Qamar, M.A. Rahman, H.K. Singh
• Keywords: Organic Pollutants, Pesticide, Photocatalytic, Semiconductor, TiO₂

References

[1] M. Atiqur Rahman, M. Muneer and D. Bahnemann: J. Adv. Oxid. Technol. Vol. 6 (2003), p.100.

[2] M. Muneer, J. Theurich and D. Bahnemann: J. Photochem. Photobiol. A. Chem. Vol. 143 (2001), p.213.

[3] H.K. Singh, M. Muneer and D. Bahnemann: Photochem. Photobiol. Sci. Vol. 2 (200), p.151.

[4] M. Muneer and D. Bahnemann: Appl. Catal. B: Environ. Vol. 36 (2002), p.95.

[5] M. Muneer, M. Saquib, M. Qamar and D. Bahnemann: Res. Chem. Intermed. Vol. 30 (2004), p.663.

[6] M. Muneer, H.K. Singh and D. Bahnemann: Chemosphere Vol. 49 (2002), p.193.

[7] M. Hoffman, S. Martin, W. Choi and D. Bahnemann: Chem. Rev. Vol. 95 (1995), p.69.

[8] D.F. Ollis and H. Al-Ekabi: Photocatalytic purification and treatment of water and air (Elsevier, Amsterdam 1993).

[9] D.M. Blake: Bibliography of work on the Photocatalytic removal of Hazardous Compounds from Water and Air (National Renewal Energy Laboratory, USA 1999).

[10] A. Mills, R.H. Davies and D. Worsley: Chem. Soc. Rev. vol. 22 (1993), p.417.

[11] P.V. Kamat: Chem. Rev. Vol. 93 (1993), p.267.

[12] M.A. Fox and M.T. Dulay: Chem. Rev. Vol. 93 (1993), p.341.

[13] D. Bahnemann: Isr. J. Chem. Vol. 33 (1993), p.115.

[14] P. Pichat: Catal. Today. Vol. 19 (1994), p.313.

[15] U.S. Aithal, T.M. Aminabhavi and S.S. Shukla: J. Hazard. Mat. Vol. 33 (1993), p.369.

[16] L.N. Lewis: Chem. Rev. Vol. 93 (1993), p.2693.

[17] D. Bahnemann, J. Cunningham, M.A. Fox, E. Pelizzeti, P. Pichat and N. Serpone: Aquatic and Surface Photochemistry. Chapter 21, 261. Disulfoton 20 P S OCH2CH3 SCH2CH2SCH2CH3 CH3CH2O O P S OCH2CH3 SCH2CH2SCH2CH3 CH3CH2O P OCH2CH3 SH CH3CH2O S + 21 22 Benzidine 23 H2N NH2 O O H2N+ 24 25.

DOI: 10.1201/9781351069847-23