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PHOTOELECTROCHEMICAL OXIDATION OF OXALATE ION IN AQUEOUS DISPERSIONS OF ZINC OXIDE
Author(s) -
Domenech J.,
Costa J. M.
Publication year - 1986
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1986.tb04725.x
Subject(s) - oxalate , ion , aqueous solution , chemistry , electrolyte , inorganic chemistry , redox , zinc , oxide , sodium oxalate , electrode , organic chemistry
The photooxidation of oxalate ions in aqueous dispersions of ZnO under UV‐illumination has been investigated in order to determine the efficiency of oxalate ions as hole scavangers. The process has been studied by measuring the quantity of oxalate ions photooxidized at different experimental conditions. It is observed that the number of moles of oxalate photodecomposed increases with irradiation time and with the mass of semiconductor in suspension, attaining in this case a limiting value. Also, the amount of oxalate ions photooxidized increases with both initial oxalate concentration and light intensity. These results are discussed in terms of the different redox processes that take place at the semiconductor particle‐electrolyte interface.