Photocatalytic degradation of organophosphorus pesticides using thin films of TiO2

✍ Scribed by Zhao Mengyue; Chen Shifu; Tao Yaowu

• Publisher: Wiley (John Wiley & Sons)
• Year: 1995
• Tongue: English
• Weight: 421 KB
• Volume: 64
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/jctb.280640405

✦ Synopsis

Abstract

This paper studies the feasibility of photocatalytic degradation of organophosphorus pesticides using thin films of TiO~2~. The results show that 0·65 × 10^−4^mol dn^−3^ of dichlorvos, monocrotophos, phorate, parathion can be completely photocatalytically degraded into PO within a short time under illumination with a medium pressure mercury lamp of 375 W. The effect of parameters such as he amount of TiO~2~ attached, initial concentration of organphosphorus pesticides, initial pH, amount of air flow, concentrations of H~2~O~2~ and Fe^3+^ on the photocatalytic degradation are studied. The possible mechanisms of photocatalytic degradation are discussed. It is our assumption that the degradation reactions occur on the surface of TiO~2~ via primary produced oxidizing species such as the OH radical and O, after 80 h illumination, there is no significant loss of the photocatalytic activity of TiO~2~.