TY - JOUR
T1 - Photoassisted degradation of 4-chlorophenol and p -cresol using MgAl hydrotalcites
AU - Mantilla, Angeles
AU - Jácome-Acatitla, Gabriela
AU - Morales-Mendoza, Getsemaní
AU - Tzompantzi, Francisco
AU - Gómez, Ricardo
PY - 2011/3/2
Y1 - 2011/3/2
N2 - MgAl hydrotalcites, or layered double hydroxides (LDHs), with different Mg/Al molar ratios were synthesized by the coprecipitation method. The structure of the solids was collapsed by thermal treatment at 723 K obtaining MgAl mixed oxides with high specific surface areas (264-318 m2/g). When these oxides were put in contact with aqueous solutions containing 4-chlorophenol and para-cresol (80 ppm:0.62 and 0.73 mmol, respectively) the layered structure was recovered by rehydration of the material showing the named "memory effect" of LDH materials. Mg/Al LDHs were active for chlorophenol and p-cresol degradation under UV irradiation, being more active and selective to the mineralization of the pollutants than TiO2 P-25 photocatalysts. Since Mg/Al hydrotalcites are not semiconductors their high photoassisted activity was surprising; this activity was explained by a photo excitation which produces mobility of charges in the lamellar structure, inducing the formation of photoactive defects.
AB - MgAl hydrotalcites, or layered double hydroxides (LDHs), with different Mg/Al molar ratios were synthesized by the coprecipitation method. The structure of the solids was collapsed by thermal treatment at 723 K obtaining MgAl mixed oxides with high specific surface areas (264-318 m2/g). When these oxides were put in contact with aqueous solutions containing 4-chlorophenol and para-cresol (80 ppm:0.62 and 0.73 mmol, respectively) the layered structure was recovered by rehydration of the material showing the named "memory effect" of LDH materials. Mg/Al LDHs were active for chlorophenol and p-cresol degradation under UV irradiation, being more active and selective to the mineralization of the pollutants than TiO2 P-25 photocatalysts. Since Mg/Al hydrotalcites are not semiconductors their high photoassisted activity was surprising; this activity was explained by a photo excitation which produces mobility of charges in the lamellar structure, inducing the formation of photoactive defects.
UR - http://www.scopus.com/inward/record.url?scp=79951970160&partnerID=8YFLogxK
U2 - 10.1021/ie1006883
DO - 10.1021/ie1006883
M3 - Artículo
AN - SCOPUS:79951970160
SN - 0888-5885
VL - 50
SP - 2762
EP - 2767
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 5
ER -