Premium
Photocatalytic degradation of organophosphorus pesticides using thin films of TiO 2
Author(s) -
Mengyue Zhao,
Shifu Chen,
Yaowu Tao
Publication year - 1995
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280640405
Subject(s) - photocatalysis , dichlorvos , oxidizing agent , degradation (telecommunications) , pesticide , mercury vapor lamp , chemistry , parathion methyl , environmental chemistry , nuclear chemistry , chemical engineering , materials science , catalysis , organic chemistry , telecommunications , optoelectronics , computer science , agronomy , biology , engineering
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 4 3−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 2 2− , after 80 h illumination, there is no significant loss of the photocatalytic activity of TiO 2 .