title: Photo-reductive decolorization of an azo dye by natural sphalerite: case study of a new type of visible light-sensitized photocatalyst.
abstract: Natural sphalerite, which represents a new class of mineral-based catalyst, was characterized and investigated for photo-reduction of an azo dye methyl orange (MO) under visible light. After 2h of visible light irradiation, a complete decolorization of the MO solution was achieved. The degradation rate was related to the pH conditions. Spectra from FT-IR analysis indicate an initial adsorption of MO to sphalerite via its sulfonate group. Further reduction of the adsorbed MO by sphalerite under light irradiation led to the destruction of the azo structure, as indicated by the results from UV-vis, FT-IR and ESI-MS analyses. The visible light-induced photocatalytic reductive activity of natural sphalerite was mainly attributed to the distribution of foreign metal atoms in its crystal lattice, which reduces the intrinsic bandgap of sphalerite and also broadens its spectra responding range. In addition, the high conduction band potential of natural sphalerite may also enhance the photo-reduction of MO.
authors.affiliation: The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Haidian District, Beijing 100871, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Anhuai
authors.initials: A
authors.lastname: Lu
authors.forename: Song
authors.initials: S
authors.lastname: Jin
authors.forename: Changqiu
authors.initials: C
authors.lastname: Wang
mesh_terms: D001391:Azo Compounds / Q000528:radiation effects*; D002384:Catalysis; D004396:Coloring Agents / Q000528:radiation effects*; D007700:Kinetics; D008027:Light; D055668:Photochemical Processes; D013440:Sulfides / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000528:radiation effects; D018508:Water Purification / Q000379:methods; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D013440:Sulfides; D014874:Water Pollutants, Chemical; D017967:Zinc Compounds; C100258:methyl orange; C031238:zinc sulfide