title: Optimization of photocatalytic treatment of dye solution on supported TiO2 nanoparticles by central composite design: intermediates identification.
abstract: Optimization of photocatalytic degradation of C.I. Basic Blue 3 (BB3) under UV light irradiation using TiO(2) nanoparticles in a rectangular photoreactor was studied. The investigated TiO(2) was Millennium PC-500 (crystallites mean size 5-10 nm) immobilized on non-woven paper. Central composite design was used for optimization of UV/TiO(2) process. Predicted values of decolorization efficiency were found to be in good agreement with experimental values (R(2)=0.9686 and Adj-R(2)=0.9411). Optimization results showed that maximum decolorization efficiency was achieved at the optimum conditions: initial dye concentration 10mg/L, UV light intensity 47.2 W/m(2), flow rate 100 mL/min and reaction time 120 min. Photocatalytic mineralization of BB3 was monitored by total organic carbon (TOC) decrease, and changes in UV-vis and FT-IR spectra. The photodegradation compounds were analyzed by UV-vis, FT-IR and GC-mass techniques. The degradation pathway of BB3 was proposed based on the identified compounds.
authors.affiliation: Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran. a_khataee@tabrizu.ac.ir
authors.forename: A R
authors.initials: AR
authors.lastname: Khataee
authors.forename: M
authors.initials: M
authors.lastname: Fathinia
authors.forename: S
authors.initials: S
authors.lastname: Aber
authors.forename: M
authors.initials: M
authors.lastname: Zarei
mesh_terms: D002384:Catalysis; D003116:Color; D004396:Coloring Agents; D008401:Gas Chromatography-Mass Spectrometry; D053758:Nanoparticles / Q000737:chemistry*; D010078:Oxazines / Q000737:chemistry / Q000528:radiation effects*; D010782:Photolysis; D012996:Solutions; D013057:Spectrum Analysis; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D004396:Coloring Agents; D010078:Oxazines; D012996:Solutions; C009495:titanium dioxide; D014025:Titanium; C529709:Basic Blue 3