title: Photodegradation of Rhodamine B over unexcited semiconductor compounds of BiOCl and BiOBr.
abstract: This study reported, for the first time systematically, photodegradation of Rhodamine B (RhB) in aqueous solution over BiOCl and BiOBr semiconductors. Under visible light irradiation (λ>400 nm, λ>420 nm and λ=550±15 nm), RhB adsorbed on the surface of BiOCl and BiOBr was photosensitized and decomposed effectively over unexcited BiOCl and BiOBr. The degradation of Methyl Orange (MO) and Methylene Blue (MB) over BiOCl and BiOBr was investigated as well, and the results were compared with RhB photodegradation. It was found that MB molecules having the lowest LUMO could not be degraded by this process. Utilizing the quantum chemical calculation (Gaussian 03 program), the relationship between frontier orbital energy of selected dye molecules and photodegradation rate was established for the first time in this study.
authors.affiliation: Department of Applied Chemistry, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China.
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Chang
authors.forename: M A
authors.initials: MA
authors.lastname: Gondal
authors.forename: A A
authors.initials: AA
authors.lastname: Al-Saadi
authors.forename: M A
authors.initials: MA
authors.lastname: Ali
authors.forename: Hefei
authors.initials: H
authors.lastname: Shen
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhou
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.forename: Mengping
authors.initials: M
authors.lastname: Du
authors.forename: Yousong
authors.initials: Y
authors.lastname: Liu
authors.forename: Guangbin
authors.initials: G
authors.lastname: Ji
mesh_terms: D001729:Bismuth / Q000737:chemistry*; D008027:Light; D055668:Photochemical Processes; D012235:Rhodamines / Q000737:chemistry*; D012666:Semiconductors
chemical_list: D012235:Rhodamines; C044685:bismuth oxychloride; C029773:rhodamine B; C542279:bismuth oxybromide; D001729:Bismuth