title: Pure ZnO and composite ZnO/TiO2 catalyst plates: a comparative study for the degradation of azo dye, pesticide and antibiotic in aqueous solutions.
abstract: Photocatalytic degradations of azo dye (RR 180), pesticide (2,4-D) and antibiotic (enrofloxacin) in aqueous solutions were performed and compared by using pure ZnO and ZnO/TiO2 composite (at 1:1 ZnO to TiO2 mole ratio) catalysts in a self-supporting plate form. The plates were produced by tape casting of the constituent powder slurries and sintering at 600°C. Photocatalytic degradations of these pollutants were carried out under UVA and UVC irradiations for 120 min. Maximum degradation was obtained for 2,4-D solution using pure ZnO plates under UVC. Due to the photolysis effect, UVC wavelength yielded higher efficiency values for all the chemicals than UVA. The discrepancy in the photocatalytic performances of the pure ZnO and the ZnO/TiO2 composite plates were not found to be significant. The plates were found to be effective for the consecutive degradation tests which indicated their potentiality in extended applications.
authors.affiliation: Gebze Institute of Technology, Environmental Engineering Dept., Turkey.
authors.forename: Eylem
authors.initials: E
authors.lastname: Topkaya
authors.affiliation: Gebze Institute of Technology, Materials Science and Engineering Dept., Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Konyar
authors.affiliation: Gebze Institute of Technology, Environmental Engineering Dept., Turkey. Electronic address: yatmaz@gyte.edu.tr.
authors.forename: H Cengiz
authors.initials: HC
authors.lastname: Yatmaz
authors.affiliation: Gebze Institute of Technology, Materials Science and Engineering Dept., Turkey.
authors.forename: Koray
authors.initials: K
authors.lastname: Öztürk
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry*; D000900:Anti-Bacterial Agents / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D000077422:Enrofloxacin; D024841:Fluoroquinolones / Q000737:chemistry*; D006540:Herbicides / Q000737:chemistry*; D055668:Photochemical Processes; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D018508:Water Purification; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D001391:Azo Compounds; D024841:Fluoroquinolones; D006540:Herbicides; C009495:titanium dioxide; D015084:2,4-Dichlorophenoxyacetic Acid; D000077422:Enrofloxacin; D014025:Titanium; D015034:Zinc Oxide
keywords: Antibiotic; Azo dye; Pesticide; Photocatalysis; ZnO–TiO(2) plates