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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 21, Number 2
BKCSDE 21(2)
February 20, 2000 

Photoactivity of CdS Particles Grown in Pt-loaded Zeolite Y
Young-Ju Hwang, Sung-Jin Kim, Sejin Park, Jae-Hun Yang, Hasuck Kim, Jin-Ho Choy
An integrated photocatalyst was prepared and its photoelectrocatalytic behavior for solar energy conversion was investigated. To make an integrated photocatalyst for hydrogen evolution, Pt and CdS clusters were embedded in zeolite as a cocatalyst and a photocatalyst, respectively. Pt particles were embedded in zeolite Y by ion exchange reaction with Pt (NH3)4 2+ and activation and reduction processes were followed. CdS clusters in zeolite Y cages were prepared by ion exchange reaction with Cd 2+ and sulfurization with Na2S in aqueous solution was followed. The existence of CdS clusters in the cavities of zeolite Y was detected by IR spectra. UV absorption edges of the samples prepared show blue shifts about 0.03-0.12 eV from the edge of bulk CdS, which is an indication of CdS clusters formed in zeolite Y. The pore structure of samples was analyzed by BET and Langmuir method. The solar energy conversion into hydrogen was investigated, where sodium tartrate solution was used as a hole scavenger. We could observe that 1 wt% Pt supported sample was the most effective photocatalyst for hydrogen evolution (62 μL/mg after 4 hour reaction).
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