TY - JOUR
T1 - Synthesis of TiO 2 catalysts doped with Cu, Fe, and Fe/Cu supported on clinoptilolite zeolite by an electrochemical-thermal method for the degradation of diclofenac by heterogeneous photocatalysis
AU - Castañeda-Juárez, Monserrat
AU - Martínez-Miranda, Verónica
AU - Almazán-Sánchez, Perla Tatiana
AU - Linares-Hernández, Ivonne
AU - Santoyo-Tepole, Fortunata
AU - Vázquez-Mejía, Guadalupe
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/7/1
Y1 - 2019/7/1
N2 - Aqueous solutions of diclofenac (DCF) were treated by heterogeneous photocatalysis using TiO 2 catalysts doped with Cu, Fe, and Cu/Fe supported on the zeolite clinoptilolite, which were prepared by a photo/electrochemical method combined with thermal treatment. The parameters evaluated in the preparation of doped TiO 2 catalysts were the treatment time (30 and 60 min), current intensity (0.5 and 1 A), and presence/absence of UV light. The doped materials were characterized by X-ray diffraction, scanning electron microscopy in conjunction with energy dispersive spectroscopy, absorption atomic and infrared spectroscopy, as well as point of zero charge measurements. The concentration of metal in the modified materials was 2.3 g Fe/g for TiFeZ-7, 2.3 g Cu/g TiCuZ-2, and 3.3 g Fe/g and 1.4 g Cu/g for TiFeCuZ-7. The photocatalysis process was carried out at different pH values (4, 5, 7, and 9) and aqueous DCF concentrations (20, 40, 60, 80, and 100 mg/L). The results indicated that the optimal pH for the oxidation of DCF was 4 with efficiencies over 97%. The degradation kinetics at 10 mg/L indicated the mineralization of DCF during the treatment, where the materials doped with copper afforded superior removal of organic matter with efficiencies of 89.5%, 82.2%, and 84.3% for the TOC, COD, and DCF concentration, respectively, as determined by HPLC, revealing the interesting catalytic effect of this metal in such a photocatalysis process.
AB - Aqueous solutions of diclofenac (DCF) were treated by heterogeneous photocatalysis using TiO 2 catalysts doped with Cu, Fe, and Cu/Fe supported on the zeolite clinoptilolite, which were prepared by a photo/electrochemical method combined with thermal treatment. The parameters evaluated in the preparation of doped TiO 2 catalysts were the treatment time (30 and 60 min), current intensity (0.5 and 1 A), and presence/absence of UV light. The doped materials were characterized by X-ray diffraction, scanning electron microscopy in conjunction with energy dispersive spectroscopy, absorption atomic and infrared spectroscopy, as well as point of zero charge measurements. The concentration of metal in the modified materials was 2.3 g Fe/g for TiFeZ-7, 2.3 g Cu/g TiCuZ-2, and 3.3 g Fe/g and 1.4 g Cu/g for TiFeCuZ-7. The photocatalysis process was carried out at different pH values (4, 5, 7, and 9) and aqueous DCF concentrations (20, 40, 60, 80, and 100 mg/L). The results indicated that the optimal pH for the oxidation of DCF was 4 with efficiencies over 97%. The degradation kinetics at 10 mg/L indicated the mineralization of DCF during the treatment, where the materials doped with copper afforded superior removal of organic matter with efficiencies of 89.5%, 82.2%, and 84.3% for the TOC, COD, and DCF concentration, respectively, as determined by HPLC, revealing the interesting catalytic effect of this metal in such a photocatalysis process.
KW - Diclofenac
KW - Electrochemical synthesis
KW - Heterogeneous photocatalysis
KW - Oxidation
KW - Regeneration
KW - Thermal treatment
UR - http://www.scopus.com/inward/record.url?scp=85065908503&partnerID=8YFLogxK
U2 - 10.1016/j.jphotochem.2019.04.045
DO - 10.1016/j.jphotochem.2019.04.045
M3 - Artículo
AN - SCOPUS:85065908503
SN - 1010-6030
VL - 380
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
M1 - 111834
ER -