TY - JOUR
T1 - TiO2/MgAl layered double hydroxides mechanical mixtures as efficient photocatalysts in phenol degradation
AU - Paredes, Silvia P.
AU - Valenzuela, Miguel A.
AU - Fetter, Geolar
AU - Flores, Sergio O.
N1 - Funding Information:
The authors gratefully acknowledge the “ CONACYT ” for financial support (Projects: 44118-Q and 79132) and Dr. Paz del Angel Vicente for the X-ray analysis.
PY - 2011/8
Y1 - 2011/8
N2 - MgAl layered double hydroxides (MgAl LDH) were synthesized by the solgel method using ultrasound irradiation in the crystallization step. The interlayer anions were nitrate and acetylacetonate-ethoxide. The solids were characterized by XRD, N2-physisorption and TEM. TiO2/MgAl LDH mixtures were prepared by mixing the MgAl LDH (as prepared) or the calcined sample with TiO2 (Aldrich, 99.9% anatase) in different weight ratios. Photocatalytic activities of the TiO2/MgAl LDH mixtures were evaluated through the degradation of phenol as model pollutant. TiO 2/MgAl LDH mixture (1:1) was more photocatalytically active for the degradation of phenol than pure TiO2. The synergy effect was attributed to a higher production of •OH radicals, which were formed from the structural hydroxides. Also, the hydrotalcite phase enhanced the phenol adsorption and transfer to the TiO2 sites where the phenol was photocatalytically degradated.
AB - MgAl layered double hydroxides (MgAl LDH) were synthesized by the solgel method using ultrasound irradiation in the crystallization step. The interlayer anions were nitrate and acetylacetonate-ethoxide. The solids were characterized by XRD, N2-physisorption and TEM. TiO2/MgAl LDH mixtures were prepared by mixing the MgAl LDH (as prepared) or the calcined sample with TiO2 (Aldrich, 99.9% anatase) in different weight ratios. Photocatalytic activities of the TiO2/MgAl LDH mixtures were evaluated through the degradation of phenol as model pollutant. TiO 2/MgAl LDH mixture (1:1) was more photocatalytically active for the degradation of phenol than pure TiO2. The synergy effect was attributed to a higher production of •OH radicals, which were formed from the structural hydroxides. Also, the hydrotalcite phase enhanced the phenol adsorption and transfer to the TiO2 sites where the phenol was photocatalytically degradated.
KW - A. Inorganic compounds
KW - B. Chemical synthesis
KW - C. Electron microscopy
KW - C. X-ray diffraction
KW - D. Crystal structure
UR - http://www.scopus.com/inward/record.url?scp=80955181035&partnerID=8YFLogxK
U2 - 10.1016/j.jpcs.2011.03.017
DO - 10.1016/j.jpcs.2011.03.017
M3 - Artículo
SN - 0022-3697
VL - 72
SP - 914
EP - 919
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
IS - 8
ER -