Synthesis, Characterization and Photocatalytic Activity of Dodetungstophosphoric Acid Supported Mesoporous Silica SBA-15
Dodetungstophosphoric acid supported mesoporous silica SBA-15 was synthesized through direct synthesis method using P123 template in acidic medium. The effect of the molar ratio of Si/W in the initial system on degree of ordering of the final product, and the amount of embedded dodetungstophosphoric acid species in parent SBA-15 substrates were studied in detail. The synthesized products were characterized by ICP, cinchonine gravimetric method, X-ray diffraction patterns (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nitrogen sorption analysis. It was found that dodetungstophosphoric acid species have been successfully embedded inside the SBA-15 pore wall without change of parent hexagonal structure, the incremental embedded amount results in pore size increasing, and the surface area, pore volume decreasing, as well as the photocatalytic degradation rate of 2,4-dichlorophenol increasing accordingly.
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Document Type: Research Article
Publication date: February 1, 2011
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