title: Photodegradation kinetics of some thiols and thiones in aqueous suspension of zinc oxide.
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.
authors.affiliation: Chemistry Department, Yasouj University, Yasouj 75914-353, Iran. mmzohori@mail.yu.ac.ir
authors.forename: Morteza
authors.initials: M
authors.lastname: Montazerozohori
authors.forename: Bahador
authors.initials: B
authors.lastname: Karami
authors.forename: Mohammad Hossein
authors.initials: MH
authors.lastname: Habibi
authors.forename: Jong-Ha
authors.initials: JH
authors.lastname: Choi
mesh_terms: D000327:Adsorption; D007093:Imidazoles / Q000737:chemistry; D007700:Kinetics; D010084:Oxidation-Reduction; D010777:Photochemistry; D010782:Photolysis; D013438:Sulfhydryl Compounds / Q000737:chemistry / Q000378:metabolism*; D013830:Thiadiazoles / Q000737:chemistry; D013871:Thiones / Q000737:chemistry / Q000378:metabolism*; D014867:Water / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D007093:Imidazoles; D013438:Sulfhydryl Compounds; D013830:Thiadiazoles; D013871:Thiones; D014867:Water; C017424:2-imidazoline; D015034:Zinc Oxide