title: Iron species in layered clay: efficient electron shuttles for simultaneous conversion of dyes and Cr(VI).
abstract: The simultaneous reduction of Chromium(VI) (Cr(VI)) and oxidation of cationic dyes in dispersions of Montmorillonite K10 (MK10) were examined under visible irradiation (λ>420 nm). The iron species (i.e. iron oxides, structural iron and exchangeable interlayer iron) in layered clays are active for catalytically reducing Cr(VI) by using Malachite green (MG) and Rhodamine B (RhB) as the electron donors. Molecular oxygen does not have a significant effect on clay-catalyzed Cr(VI) reduction, but is important for oxidative degradation of dye pollutants. MK10 catalysts are stable and reusable, and are therefore considered as a promising naturally-abundant material for decontamination of dye and heavy metals.
authors.affiliation: State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
authors.forename: Renlan
authors.initials: R
authors.lastname: Liu
authors.forename: Yaoguang
authors.initials: Y
authors.lastname: Guo
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Wang
authors.forename: Jianshe
authors.initials: J
authors.lastname: Liu
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry*; D001546:Bentonite; D002384:Catalysis; D002857:Chromium / Q000737:chemistry*; D000077215:Clay; D004396:Coloring Agents / Q000737:chemistry*; D004583:Electrons; D007501:Iron / Q000032:analysis* / Q000737:chemistry; D008956:Models, Chemical; D010084:Oxidation-Reduction; D012235:Rhodamines / Q000737:chemistry; D012394:Rosaniline Dyes / Q000737:chemistry
chemical_list: D000538:Aluminum Silicates; D004396:Coloring Agents; D012235:Rhodamines; D012394:Rosaniline Dyes; D002857:Chromium; C005095:malachite green; D001546:Bentonite; C074702:chromium hexavalent ion; D007501:Iron; C029773:rhodamine B; D000077215:Clay
keywords: Electron transfer; Layered clay; Structural iron; Visible light