title: Efficiency of a Photoreactor Packed with Immobilized Titanium Dioxide Nanoparticles in the Removal of Acid Orange 7.
abstract: In this paper, the removal efficiency of Color Index Acid Orange 7 (AO7) as a model contaminant was investigated in a batch-recirculated photoreactor packed with immobilized titanium dioxide type P25 nanoparticles on glass beads. The effects of different operational parameters such as the initial concentration of AO7, the volume of solution, the volumetric flowrate, and the light source power in the photoreactor were investigated. The results indicate that the removal percent increased with the rise in volumetric flowrate and power of the light source, but decreased with the rise of the initial concentration of AO7 and the volume of solution. The AO7 degradation was followed through total organic carbon, gas chromatography/mass spectroscopy (GC/MS), and mineralization products analysis. The ammonium and sulfate ions were analyzed as mineralization products of nitrogen and sulfur heteroatoms, respectively. The results of GC/MS revealed the production of 1-indanone, 1-phthalanone, and 2-naphthalenol as intermediate products for the removal of AO7 in this process.
authors.affiliation: Department of Chemistry, Tabriz Branch, Islamic Azad University, Tabriz, I.R. Iran.
authors.forename: Behnaz
authors.initials: B
authors.lastname: Sheidaei
authors.forename: Mohammad A
authors.initials: MA
authors.lastname: Behnajady
mesh_terms: D001391:Azo Compounds / Q000737:chemistry / Q000528:radiation effects*; D001557:Benzenesulfonates / Q000737:chemistry / Q000528:radiation effects*; D008401:Gas Chromatography-Mass Spectrometry; D053768:Metal Nanoparticles / Q000737:chemistry; D010782:Photolysis; D014025:Titanium / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000528:radiation effects*; D018508:Water Purification / Q000379:methods*
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014025:Titanium; C014722:2-naphthol orange