KINETIC-STUDIES AND MECHANISMS OF PHOTOIN DUCED OXIDATION OF OXALATE ION BY PEROXODISULFATE ION

Kinetic studies on the photocatalytic oxidation of oxalate ion (C2O42- ) by peroxodisulfate ion (S2O82-) in the presence of ruthenium(II) com plexes have been carried out in an aqueous solution. The oxidative lum inescence quenching of tris (2,2'-bipyridine) ruthenium(II) complex ([ Ru(bpy)3](2+)) by S2O82- generated SO4-., which could function as an i nitiator for a series of oxidation reactions of C2O42-. In the case of tris (2,2'-bipyrazine) ruthenium(II) complex ([Ru(bpz)(3)](2+)), On t he other hand, the reductive luminescence quenching by C2O42- generate d CO2-., which could initiate the corresponding oxidation reactions. P hotocatalytic reaction mechanisms were analyzed by changing some basic reaction conditions: they were compared with the corresponding oxidat ion reactions using copper(II) and silver(I) ions as the catalysts.