Photodegradation of an Herbicide (2-methyl-4-chlorophenoxyacetic acid) in the Presence of 'TiO_2, SnO_2, SnO_2/TiO_2 Nanoparticles – Polypropylene Fibrous Carrier' Systems

摘要

Using electronic spectroscopy and fluorescence techniques, the degradation of 2-methyl-4-chlorophenoxyacetic acid has been researched in water under the excitation with UV radiation produced by a KrCl excimer lamp in the presence of "TiO_2, SnO_2, SnO_2/TiO_2 Nanoparticles –Polypropylene Fibrous Carrier" Systems. It has been determined that MCPA photo transformation is most efficient when using the "TiO_2/SnO_2 heteronanoparticles – carrier" system with the concentration of 25/6 mg/g. The results indicate that systems with applied semiconductor particles do not exhibit sorption properties towards MCPA molecules. Therefore, the change in the spectral characteristics of a MCPA water solution after time-exposure and exposure to radiation is only associated with the photo transformations of non-adsorbed MCPA molecules and with the emergence of their photo degradation products.