Mesoporous Ti-MCM-41 materials as photodegradation catalysts of 2,4,6-trichlorophenol in water |
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Authors: | Ahmed?K?Aboul-Gheit Sohair?M?Abdel-Hamid Sawsan?A?Mahmoud Radwa?A?El-Salamony József?Valyon Magdolna?R?Mihályi Email author" target="_blank">ágnes?SzegediEmail author |
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Affiliation: | 1.Egyptian Petroleum Research Institute,Cairo,Egypt;2.Chemical Research Center,Hungarian Academy of Sciences,Budapest,Hungary |
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Abstract: | Titanium-modified MCM-41 type mesoporous silica materials were prepared by hydrothermal Ti-MCM-41(HT)], sol–gel Ti-MCM-41(SG)]
and post-synthesis impregnation TiO2/MCM-41] methods. The materials were characterized and tested as photocatalysts in the oxidative degradation reaction of 2,4,6-trichlorophenol
(2,4,6-TCP) in water. The catalysts showed high initial activity. The produced acetate and chloride ions were found to inhibit
the degradation reaction. The Ti-MCM-41(HT) sample showed higher overall activity than the Ti-MCM-41(SG) catalyst. One of
the probable reasons for this is the difference in the distribution of the active sites that determines the rates of electron
(e−)–hole (h+) recombination within the photoactive species. The HT preparation was found to contain silica-bound titania in higher dispersion,
while the SG preparation contained also polymerized species with Ti–O–Ti bonds. |
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