Photocatalytic degradation of organophosphorous insecticides in aqueous semiconductor suspensions

Two organophosphorous insecticides, dimethyl-2,2-dichlorovinyl phosphate (DDVP) and dimethyl-2,2,2-trichloro-l-hydroxyethyl phosphonate (DEP), were degraded in the presence of suspended TiO 2 by illumination with a super-high pressure mercury lamp or by exposure to sunlight. Pt-loading to TiO 2 enha...

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Bibliographic Details
Published in:Water research (Oxford) 1990-11, Vol.24 (11), p.1415-1417
Main Authors: Harada, Kenji, Hisanaga, Teruaki, Tanaka, Keiichi
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
General purification processes
hydrogen peroxide
organophosphorous insecticide
photocatalyst
Pollution
semiconductor
sunlight
titanium dioxide
Wastewaters
Water treatment and pollution
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Summary:Two organophosphorous insecticides, dimethyl-2,2-dichlorovinyl phosphate (DDVP) and dimethyl-2,2,2-trichloro-l-hydroxyethyl phosphonate (DEP), were degraded in the presence of suspended TiO 2 by illumination with a super-high pressure mercury lamp or by exposure to sunlight. Pt-loading to TiO 2 enhanced the degradation rates 4.5- and 6-fold for DDVP and DEP, respectively. The addition of H 2O 2 to the suspension also enhanced the rates 10- and 2-fold for the former and latter, respectively. The final degradation products were Cl −, PO 3− 4, H + and CO 2, and one of the intermediates was formaldehyde.
ISSN:0043-1354
1879-2448
DOI:10.1016/0043-1354(90)90162-Y