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Gobinda Chandra De ¹, Anadi Mohan Roy ¹

Affiliations
1 Department of Chemical Technology, Calcutta University, 92 Acharya Prafulla Chandra Road, Calcutta-700 009, IN

Abstract

Photocatalytic production of hydrogen using CdS suspensions in aqueous solution containing Na₂S-Na₂SO₃ has been studied. CdS prepared from different salts of Cd(II) and Na₂S or H₂S shows different photocatalytic activity towards generation of hydrogen. Use of excess of Cd²⁺ or S^2- in the preparation of CdS affects its photocatlytic activity. Pt, Pd, Ag₂S or RuO₂ have been added to CdS in different proportions. In each case, a maximum hydrogen production is observed at a definite composition. In case of CdS/ZnS mixture, the intimate contact of Pt with CdS is absolutely necessaly in exerting the role of Pt for enhancing the hydrogen evolution by the ternary semiconductor system. Attempt has been made to correlate the photocatalytic activity order of the semiconductors to their luminescence property.

Keywords

Hydrogen Production, CdS Semiconductor, Mixed Semiconductor, Electron-Hole Transfer, Photoelectro-Chemical Cell.

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Gobinda Chandra De ¹, Pushpita Roy ¹, Anadi Mohan Roy ¹

Affiliations
1 Department of Chemical Technology, University of Calcutta, 92, A.P.C. Road, Kolkata-700 009, West Bengal, IN

Abstract

Mixed CdS-ZnS photocatalyst (1 : 4 molar ratio) and Pt, Pd loaded mixed semiconductor photocatalysts immobilized on Whatmann No. 1 fitter paper matrix were prepared. Photocatalytic production of hydrogen from Na₂S-Na₂SO₃ solution by immobilized photocatalyst using sacrificial agents like EDTA, oxalate, formate etc. and photosensitiser like Ru(bipy)₃Cl₂ were studied. The maximum photoproduction of hydrogen obtain when mixed CdS-ZnS loaded with Pt (1.5 wt%) photocatalyst immobilized in Whatman No.1 filter paper matrix was used with Ru (bipy)₃Cl₂.

Keywords

Mixed CdS-ZnS, Hydrogen Production, Electron-Hole Transfer.

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