TY - JOUR
T1 - Heterogeneous photocatalysis of a dye solution using supported TiO 2 nanoparticles combined with homogeneous photoelectrochemical process
T2 - Molecular degradation products
AU - Khataee, A. R.
AU - Zarei, M.
AU - Ordikhani-Seyedlar, R.
PY - 2011/3/16
Y1 - 2011/3/16
N2 - Treatment of a dye solution containing C.I. Basic Red 46 (BR46) by homogeneous photoelectro-Fenton (PEF) combined with heterogeneous photocatalytic process was studied. The investigated photocatalyst was TiO2 nanoparticles (Degussa P-25) immobilized on glass plates. Carbon nanotube-polytetrafluoroethylene (CNT-PTFE) electrode was used as cathode. Response surface methodology (RSM) was employed to assess individual and interactive effects of the four key factors (initial amount of Fe(III), initial concentration of the dye, reaction time and applied current) in PEF/UV/TiO 2 process. Analysis of variance (ANOVA) showed a high coefficient of determination value (R2 = 0.935) and satisfactory prediction second-order regression. Graphical response surface and contour plots were used to locate the optimum point. The optimum initial amount of Fe(III), initial dye concentration, reaction time and applied current were found to be 0.1 mM, 15 mg/L, 35 min and 300 mA, respectively. The observed experimental response was 88.89 of decolorization efficiency in optimum conditions of variables. The total organic carbon (TOC) measurements showed 99.2% mineralization of 15 mg/L dye at 6 h using PEF/UV/TiO2 process. GC-MS analysis verified the identity of intermediates. The electrical energy consumption for the photo- electrochemical process was evaluated.
AB - Treatment of a dye solution containing C.I. Basic Red 46 (BR46) by homogeneous photoelectro-Fenton (PEF) combined with heterogeneous photocatalytic process was studied. The investigated photocatalyst was TiO2 nanoparticles (Degussa P-25) immobilized on glass plates. Carbon nanotube-polytetrafluoroethylene (CNT-PTFE) electrode was used as cathode. Response surface methodology (RSM) was employed to assess individual and interactive effects of the four key factors (initial amount of Fe(III), initial concentration of the dye, reaction time and applied current) in PEF/UV/TiO 2 process. Analysis of variance (ANOVA) showed a high coefficient of determination value (R2 = 0.935) and satisfactory prediction second-order regression. Graphical response surface and contour plots were used to locate the optimum point. The optimum initial amount of Fe(III), initial dye concentration, reaction time and applied current were found to be 0.1 mM, 15 mg/L, 35 min and 300 mA, respectively. The observed experimental response was 88.89 of decolorization efficiency in optimum conditions of variables. The total organic carbon (TOC) measurements showed 99.2% mineralization of 15 mg/L dye at 6 h using PEF/UV/TiO2 process. GC-MS analysis verified the identity of intermediates. The electrical energy consumption for the photo- electrochemical process was evaluated.
KW - Carbon nanotube
KW - Experimental design
KW - Photodegradation
KW - TiO nanoparticles
KW - TOC
UR - http://www.scopus.com/inward/record.url?scp=79952753706&partnerID=8YFLogxK
U2 - 10.1016/j.molcata.2011.01.028
DO - 10.1016/j.molcata.2011.01.028
M3 - Article
AN - SCOPUS:79952753706
SN - 1381-1169
VL - 338
SP - 84
EP - 91
JO - Journal of Molecular Catalysis A: Chemical
JF - Journal of Molecular Catalysis A: Chemical
IS - 1-2
ER -