Annali di Chimica 2006-01-01

Photodegradation kinetics of some thiols and thiones in aqueous suspension of zinc oxide.

Morteza Montazerozohori, Bahador Karami, Mohammad Hossein Habibi, Jong-Ha Choi

Index: Ann. Chim. 96(5-6) , 285-92, (2006)

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Abstract

Photodegradation of several thiols and thiones including 2-pyrimidinethiol, thiazolidine-2-thione, imidazolidine-2-thione, 1,2,4- triazole 3-thiol and 2,5-dimercapto- 1,3,4-thiadiazole have been studied in aerated aqueous solution using zinc oxide under irradiation with 400W high pressure mercury lamp. Rate constants span the range from 2.44 x 10(-2) min x (-1) to 1.76 x 10(-1) min x (-1). The slower degradation rate of 2-imidazoline 2-thione could be related to oxidation potential of the corresponding ring. The Langmuir-Hinshelwood (L-H) rate constant k(r) and adsorption constant, (KA) for all five thiols and thiones are reported.

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