Photocatalytic Degradation of Pendimethalin in the Presence of Titanium Dioxide

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 1995 English Publisher:American Chemical Society (ACS)Journal:Journal of Agricultural and Food Chemistry, volume 43, pages 171-174 (issn: 0021-8561, eissn: 1520-5118,

Authors: Asit K. Das; Srikumar Pal; Goutam K. Pandit;

doi: 10.1021/jf00049a031

Photocatalytic Degradation of Pendimethalin in the Presence of Titanium Dioxide

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Abstract

Photolysis of an aqueous methanolic solution of pendimethalin (I), carried out under UV light in the presence of TiO 2 for 7 h, led to about 50% decomposition of I in contrast with 8% without TiO 2 . Among the six photoproducts isolated, two have been identified as 1-(1-ethylpropyl)-5,6-dimethyl-7-nitrobenzimidazole (II) and 5,6-dimethyl-7-nitrobenzimidazole (III) on the basis of spectroscopic data. Moreover, GC-MS data gave indications of two minor photoproducts, N-propyl-2-nitro-6-amino-3,4-xylidine (VI) and 2,3-dimethyl-5-nitro-6-(hydroxyamino)phenol (VII)

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