Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 50, Issue 5, Pages 2762-2767Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ie1006883
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Funding
- CONACYT Mexico
- CONACYT [CB-2006-1-62053]
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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 m(2)/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 photo catalysts. 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.
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