pH EFFECT OF 02 PHOTOUPTAKE IN AQUEOUS SUSPENSION OF CdS

doi:10.7517/j.issn.1674-0475.1994.02.177

Imaging Science and Photochemistry ›› 1994, Vol. 12 ›› Issue (2): 177-181.DOI: 10.7517/j.issn.1674-0475.1994.02.177

pH EFFECT OF 0₂ PHOTOUPTAKE IN AQUEOUS SUSPENSION OF CdS

Received:1993-03-29 Revised:1993-06-15 Online:1994-05-20 Published:1994-05-20

Abstract

Abstract: The pH effect of photouptake of O₂ on CdS and Pt/CdS was investigated. The resultindicates that there are two types of mechanism for O₂ photouptake aqueous dispersions of CdS and Pt/CdS. In acidic condition,O₂ photouptake proceeds continuously and canbe described with 1st order rate equation. In basic condition,O₂ photouptake ceaises afterhalf an hour irradiation,which is illustrated by following equations: CdS+2O₂^2-+2h⁺→Cd²⁺+SO₄^2- Cd²⁺+2OH^-→Cd(OH)₂ Then,the surface of CdS is covered by Cd(OH)₂ and the O₂ uptake is hindered.

Key words: photouptake, photocorrosion, cadmium sulfide

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pH EFFECT OF 0₂ PHOTOUPTAKE IN AQUEOUS SUSPENSION OF CdS

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