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Original Articles

Investigation on photogenerated radicals of some carboxylates in solution and in aqueous dispersions of AgBr

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Pages 269-274 | Received 23 Aug 2002, Accepted 12 Feb 2003, Published online: 06 Oct 2016
 

Abstract

The photogenerated free radicals from formate, oxalate and acetate in aqueous solutions without and with dispered AgBr grains under illuminations of 355 nm laser light, natural light and monochromatic red, green or blue light were detected by electron spin resonance with spin-trap DMPO. The results showed that: (a) ·CO2 radicals were produced in the formate solution by all of these illuminations; (b) the signals of ·CO2 radicals were greatly intensified when an AgBr dispersion was present in the formate solution; (c) the signals of ·CO2 radicals in the oxalate solution were also detected and intensified when an AgBr dispersion was present, but only after illumination by the 355 nm laser; (d) ·CH3 radicals, instead of ·CO2, were weakly detected in the acetate solution, but only in the presence of AgBr under illumination by the 355 nm laser. The photochemical behaviour of these carboxylates, particularly formate and oxalate, perhaps implies their capability for trapping photogenerated holes and their potential for acting as a hole converter to an effective electron carrier.

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