Inderscience Publishers

Influence of AgYzeolite on the photocatalyticoxidation of pirimicarb

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Silver clusters were incorporated into the Y zeolite framework and used as a photocatalyst toward pirimicarb. X-ray fluorescence (XRF), X-ray photoelectron spectroscopy (XPS), and low-temperature steady-state photoluminescence spectroscopic data indicate the formation of metallic silver as well as ionic clusters. The photodecomposition of the pirimicarb pesticide is enhanced in the presence of silver doped into zeolite Y; where the observed rate constant in the presence of the catalyst is 2.2 × 10
–2
min
–1
compared to the rate constant of 7.0 × 10
–4
min
–1
for the uncatalysed irradiated pirimicarb solution. GC-MS indicates that while pirimicarb alone was hydrolysed into N-N-dimethylcarbamic acid and 2-dimethylamino-5,6-dimethylpyrimidin-4-ol; the presence of AgY catalyst produced the selective oxidation product 4-dimethylcarbamoyloxy-5,6-dimethylpyrimidin-2-yl-carbimic acid.

Keywords: pirimicarb, silver, AgY, zeolite, catalyst, luminescence, XPS

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