title: Synthesis, characterization and photocatalytic properties of SnO2-ZnO composite under UV-A light.
abstract: The SnO2 loaded ZnO (SnO2-ZnO) was successfully synthesized by precipitation-decomposition method. The catalyst was characterized by X-ray diffraction (XRD), high resolution scanning electron microscope (HR-SEM) images, energy dispersive spectrum (EDS), diffuse reflectance spectra (DRS), photoluminescence spectra (PL) and BET surface area measurements. The photocatalytic activity of SnO2-ZnO was investigated for the degradation of Acid Orange 10 (AO 10) in aqueous solution using UV-A light. SnO2-ZnO is found to be more efficient than commercial ZnO, bare ZnO, TiO2-P25 and TiO2 (Merck) at pH 12 for the mineralization of AO 10 dye. The effects of operational parameters such as the amount of photocatalyst, dye concentration, initial pH on photo mineralization of AO 10 dye have been analyzed. The mineralization of AO 10 has been confirmed by chemical oxygen demand (COD) measurements. A degradation mechanism is proposed for the degradation of AO 10 with SnO2-ZnO under UV-A light. This catalyst is found to be reusable.
authors.affiliation: Photocatalysis Laboratory, Department of Chemistry, Annamalai University, Annamalainagar 608 002, Tamil Nadu, India.
authors.forename: V
authors.initials: V
authors.lastname: Kuzhalosai
authors.forename: B
authors.initials: B
authors.lastname: Subash
authors.forename: A
authors.initials: A
authors.lastname: Senthilraja
authors.forename: P
authors.initials: P
authors.lastname: Dhatshanamurthi
authors.forename: M
authors.initials: M
authors.lastname: Shanthi
mesh_terms: D000042:Absorption; D001391:Azo Compounds / Q000737:chemistry; D057919:Biological Oxygen Demand Analysis; D002384:Catalysis / Q000528:radiation effects; D004396:Coloring Agents / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D010782:Photolysis / Q000528:radiation effects; D012542:Scattering, Radiation; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D017971:Tin Compounds / Q000138:chemical synthesis* / Q000737:chemistry* / Q000528:radiation effects; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction; D015034:Zinc Oxide / Q000138:chemical synthesis* / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D012996:Solutions; D017971:Tin Compounds; C008710:Orange G; C045358:stannic oxide; D015034:Zinc Oxide
keywords: Acid Orange 10; Photocatalysis; Reusability; SnO(2) loaded ZnO; UV-A light