SCHEDULED MAINTENANCE
Photo-oxidation of water using Prussian Blue as catalyst
Abstract
Pulse-radiolysis experiments have shown that Prussian Blue (PB){Fe4[Fe(CN)6]3} catalyses decay of tris(2,2′-bipyridyl)ruthenium(III) in aqueous solution at pH 3.2. The bimolecular rate constant for electron transfer between PB and bipy3Ru3+ is (2.1±0.5)× 105 dm3 mol–1s–1, which is well below the diffusion-controlled limit. The reaction leads to oxidation of water to O2 and photoirradiation of bipy3Ru2+ in aqueous solution containing sodium persulphate (as sacrificial electron acceptor), and PB generates O2 with a quantum efficiency of ca. 2%. The limiting yield of O2(1.5 × 10–4 mol dm–3) is set by the PB-catalysed reduction of O2 and by O2 quenching of triplet bipy3Ru2+.
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