TY - JOUR
T1 - Sol-gel and impregnated prepared silver TiO2 semiconductors as photocatalysts for the UV decomposition of 2,4-d
T2 - A comparative study of the preparation method
AU - Rodríguez-González, V.
AU - Morán-Pineda, F. M.
AU - Del Angel, P.
AU - Vazquez-Cuchillo, O.
AU - Gómez, R.
PY - 2011/7
Y1 - 2011/7
N2 - UV-photocatalytic oxidation of 2,4-dichlorophenoxyacetic acid (2,4-d) was studied on Silver-TiO2 semiconductors prepared by co-gelling silver acetylacetonate and titanium butoxide (TiO2-Ag) or by incipient impregnation with silver acetylacetonate (0.5 wt% Ag) of bare TiO2 sol-gel and TiO2-P25 supports. The comparative study shows that only a slight modification on the specific surface area was obtained on the TiO 2-Ag sample (60 m2/g) as compared to the TiO2 sol-gel bare support (65 m2/g). XRD patterns of the samples show anatase as the crystalline phase present in the sol-gel TiO2 preparations. By means of HRTEM and HAADF-STEM electron microscopy techniques, silver nanoparticles (<12.0 nm) were identified which are very small to be detected by XRD. The photocatalytic oxidation of the herbicide 2,4-d used as a model of contaminant show for the kinetic parameter t1/2 values of 45 min for the TiO2-Ag sample, while for the impregnated Ag/TiO 2 and Ag/P25 nanomaterials t1/2 was 124 and 66 min, respectively. The higher photoactivity of the TiO2-Ag photocatalyst is attributed to a combined effect of the silver nanoparticles in interaction with the titania semiconductor.
AB - UV-photocatalytic oxidation of 2,4-dichlorophenoxyacetic acid (2,4-d) was studied on Silver-TiO2 semiconductors prepared by co-gelling silver acetylacetonate and titanium butoxide (TiO2-Ag) or by incipient impregnation with silver acetylacetonate (0.5 wt% Ag) of bare TiO2 sol-gel and TiO2-P25 supports. The comparative study shows that only a slight modification on the specific surface area was obtained on the TiO 2-Ag sample (60 m2/g) as compared to the TiO2 sol-gel bare support (65 m2/g). XRD patterns of the samples show anatase as the crystalline phase present in the sol-gel TiO2 preparations. By means of HRTEM and HAADF-STEM electron microscopy techniques, silver nanoparticles (<12.0 nm) were identified which are very small to be detected by XRD. The photocatalytic oxidation of the herbicide 2,4-d used as a model of contaminant show for the kinetic parameter t1/2 values of 45 min for the TiO2-Ag sample, while for the impregnated Ag/TiO 2 and Ag/P25 nanomaterials t1/2 was 124 and 66 min, respectively. The higher photoactivity of the TiO2-Ag photocatalyst is attributed to a combined effect of the silver nanoparticles in interaction with the titania semiconductor.
KW - 2,4- dichlorophenoxiacetic acid
KW - 2-4-d herbicide photodegradation
KW - Silver acetylacetonate precursor
KW - Silver nanoparticles
KW - Slurry UV photodegradation
UR - http://www.scopus.com/inward/record.url?scp=80051547496&partnerID=8YFLogxK
U2 - 10.1007/s10971-011-2462-3
DO - 10.1007/s10971-011-2462-3
M3 - Artículo
AN - SCOPUS:80051547496
SN - 0928-0707
VL - 59
SP - 57
EP - 62
JO - Journal of Sol-Gel Science and Technology
JF - Journal of Sol-Gel Science and Technology
IS - 1
ER -