Photoassisted Degradation of 4-Chlorophenol and p-Cresol Using MgAl Hydrotalcites
| Autor: | Gabriela Jacome-Acatitla, R. Gomez, Getsemani Morales-Mendoza, Francisco Tzompantzi, A. Mantilla |
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| Rok vydání: | 2010 |
| Předmět: |
Chlorophenol
Aqueous solution Hydrotalcite Coprecipitation General Chemical Engineering Inorganic chemistry Layered double hydroxides General Chemistry Thermal treatment engineering.material Industrial and Manufacturing Engineering chemistry.chemical_compound chemistry engineering Lamellar structure p-Cresol |
| Zdroj: | Industrial & Engineering Chemistry Research. 50:2762-2767 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie1006883 |
| Popis: | 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 TiO 2 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. |
| Databáze: | OpenAIRE |
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