TY - JOUR
T1 - Preparation, characterization and photocatalytic activity of ZnO, Fe2O3 and ZnFe2O4
AU - Valenzuela, M. A.
AU - Bosch, P.
AU - Jiménez-Becerrill, J.
AU - Quiroz, O.
AU - Páez, A. I.
N1 - Funding Information:
This work was supported by a financial grant (CGPI-200800) from the Instituto Politécnico Nacional (IPN) and the authors also thank the support of COFAA-IPN.
PY - 2002/5/31
Y1 - 2002/5/31
N2 - ZnO, Fe2O3 and ZnFe2O4 were synthesized by precipitation or coprecipitation at constant pH. After aging, washing and drying, the solids were calcined at 800°C. The samples were characterized by XRD, TGA, N2 physisorption, UV-Vis and TPR. The photocatalytic degradation of phenol was studied in a batch reactor and TiO2 (Degussa, P-25) was used as a reference catalyst. Pure ZnO and Fe2O3 were obtained at 800°C, whereas ZnFe2O4 and α-Fe2O3 (segregated) were detected in the zinc ferrite sample. TPR experiments showed the reduction peaks in the range of 350-800°C only with Fe2O3 and ZnFe2O4, attributed to Fe3+ to Fe2+ reduction and complete dehydroxylation. The photodegradation of phenol (samples calcined at 800°C) showed small but significant variations that decreased in the order: TiO2 > ZnFe2O4 > ZnO > Fe2O3. Subproducts such as hydroquinone, catechol and benzoquinone were mainly detected. In particular, attention was focused on our prepared materials because after 24 h they did not dissolve as happened with TiO2.
AB - ZnO, Fe2O3 and ZnFe2O4 were synthesized by precipitation or coprecipitation at constant pH. After aging, washing and drying, the solids were calcined at 800°C. The samples were characterized by XRD, TGA, N2 physisorption, UV-Vis and TPR. The photocatalytic degradation of phenol was studied in a batch reactor and TiO2 (Degussa, P-25) was used as a reference catalyst. Pure ZnO and Fe2O3 were obtained at 800°C, whereas ZnFe2O4 and α-Fe2O3 (segregated) were detected in the zinc ferrite sample. TPR experiments showed the reduction peaks in the range of 350-800°C only with Fe2O3 and ZnFe2O4, attributed to Fe3+ to Fe2+ reduction and complete dehydroxylation. The photodegradation of phenol (samples calcined at 800°C) showed small but significant variations that decreased in the order: TiO2 > ZnFe2O4 > ZnO > Fe2O3. Subproducts such as hydroquinone, catechol and benzoquinone were mainly detected. In particular, attention was focused on our prepared materials because after 24 h they did not dissolve as happened with TiO2.
KW - Characterization
KW - Oxide-materials
KW - Phenol photodegradation
KW - Precipitation
UR - http://www.scopus.com/inward/record.url?scp=0037204988&partnerID=8YFLogxK
U2 - 10.1016/S1010-6030(02)00040-0
DO - 10.1016/S1010-6030(02)00040-0
M3 - Artículo
SN - 1010-6030
VL - 148
SP - 177
EP - 182
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
IS - 1-3
ER -