Photodegradation of an Herbicide (2-methyl-4-chlorophenoxyacetic acid) in the Presence of “TiO₂, SnO₂, SnO₂/TiO₂ Nanoparticles – Polypropylene Fibrous Carrier” Systems

Abstract

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 “TiO2, SnO2, SnO2/TiO2Nanoparticles – Polypropylene Fibrous Carrier” Systems. It has been determined that MCPA phototransformation is most efficient when using the “TiO2/SnO2heteronanoparticles – 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 МСРА molecules. Therefore, the change in the spectral characteristics of a МСРА water solution after time-exposure and exposure to radiation is only associated with the phototransformations of non-adsorbed МСРА molecules and with the emergence of their photodegradation products.

IR Spectroscopy of Polypropylene Fibrous Carrier before and after its Surface Modification with Metal Nanoparticles

“…Nanosize semiconductors attached to the polymer fibre surface can be used for the transformation of organic water pollutants, such as phenols, aromatics, surface-active reagents, and nitro compounds, into the compounds safe for humans [6][7]. At recent time, a lot of success is achieved in the developing the filtering materials -the polypropylene fibres, whose surface is modified with active nanoparticles, such as the systems named as "nanoparticles (TiO 2 , SnO 2 , TiO 2 /SnO 2 ) -polypropylene fibrous carrier" [8][9]. Structure and properties of modified materials and, consequently, the functional features and application sphere largely depend on methods of their obtaining.…”