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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 12, No. 2, 2015, pp. 513-526
Bioline Code: st15047
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 12, No. 2, 2015, pp. 513-526

 en Photocatalytic elimination of aqueous 2-methyl-4- chlorophenoxyacetic acid in the presence of commercial and nitrogen-doped TiO2
Rivas, J.; Solls, R.R.; Gimeno, O. & Sagasti, J.

Abstract

An attempt to synthesize an active photocatalyst for 2-methyl-4-chlorophenoxyacetic acid removal has been accomplished. Black light (main emission wavelength at 365 nm) photocatalytic experiments with bare and N-doped titania have been carried out, and the results compared to those obtained in the presence of titania Degussa P-25. Doping percentage and calcination temperature influences have been investigated in photocatalytic runs using pure and commercial 2-methyl-4-chlorophenoxyacetic acid. In no case, the results obtained with synthesized titania improved the activity of P-25. Some kinetic tests allowed for the proposal of a pseudoempirical reaction mechanism capable of acceptably simulating the process in the presence of P-25. From the proposed mechanism, the roles played by hydroxyl, peroxyl and organic radicals have been suggested.

Keywords
Black light; Herbicides; Photocatalysis; Reaction mechanism; Titania

 
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