Abstract
The surface composition and structure of both raw CdS and high temperature treated CdS were investigated by means of XPS and AES. The results show that the oxidation of CdS has a transition temperature (~400°C). Above this temperature CdSO 4 would be formed on the surface of CdS. The surface oxide CdO reacts with H 2O easily in air to form Cd(OH) 2. There exists a multilayer which consists of different compositions on the treated CdS surface. The outermost layer is rich in CdSO 4, which is readily washed away by acidic water. Thus, we concluded that in the processes of high temperature air treatment and acidic water washing, a Cd(OH) 2-CdO-CdS composite layer is formed on the CdS surface. The effect of this composite layer on the activity of metal loaded catalyst in photocatalytic dehydrogenation of alcohol is currently being studied in our laboratory.
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