title: Photocatalytic degradation of Direct Red 23 dye using UV/TiO2: Effect of operational parameters.
abstract: In this study, the photocatalytic degradation of Direct Red 23 (Scarlet F-4BS) was investigated in UV/TiO2 system. The effect of catalyst loading and pH on the reaction rate was ascertained and optimum conditions for maximum degradation were determined. The results obtained showed that acidic pH is proper for the photocatalytic removal of Direct Red 23. In addition, the effects of several cations (Cu2+, Al3+, Cr3+, and Sn4+) and anions (BiO3(-), SO4(2-), and CN(-)) and C2H5OH were examined in this photocatalytic process. On the order hand, three types of catalysts (Fe2O3, SnO2, and ZnO) were compared with TiO2. After 90 min reaction, the relative decomposition order established was UV/TiO2>UV/SnO2>UV/Fe2O3>UV/ZnO.
authors.affiliation: Department of Chemistry, Islamic Azad University North Tehran Branch, PO Box 1913674711, Tehran, Iran. mahmodreza_sohrabi@yahoo.com <mahmodreza_sohrabi@yahoo.com>
authors.forename: M R
authors.initials: MR
authors.lastname: Sohrabi
authors.forename: M
authors.initials: M
authors.lastname: Ghavami
mesh_terms: D000813:Anilides / Q000737:chemistry / Q000528:radiation effects; D001391:Azo Compounds / Q000737:chemistry / Q000528:radiation effects; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry / Q000528:radiation effects; D005290:Ferric Compounds / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D017971:Tin Compounds / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000528:radiation effects; D018508:Water Purification / Q000379:methods*; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: D000813:Anilides; D001391:Azo Compounds; D004396:Coloring Agents; D005290:Ferric Compounds; D017971:Tin Compounds; D014874:Water Pollutants, Chemical; C506598:1-(2-methoxy-5-nitrophenylazo)-2-hydroxy-3-(3-nitrophenylcarbamoyl)naphthalene; C009495:titanium dioxide; C000499:ferric oxide; D014025:Titanium; C045358:stannic oxide; D015034:Zinc Oxide