Abstract
Poly (glycidyl methacrylate) (PGMA) was grafted onto the SiO2 surface to prepare the hairy particles PGMA/SiO2 using the “grafting from” method, and then vacant Wells-Dawson-type polyoxometalates (POMs) was covalently bonded to PGMA/SiO2 using the silane coupling agent to prepare heterogeneous catalyst POM-PGMA/SiO2. It is highly efficient and selective for tetrahydrothiophene (THT) oxidation. The oxidation process of THT catalyzed by POM-PGMA/SiO2 using H2O2 presented some special characters. POM-PGMA/SiO2 showed a certain microenvironment effect of the carrier, and effectively promoted the THT oxidation. There are optimal values for both the amount of POM-PGMA/SiO2 and the bonding amount of POM for THT oxidation, and the excessive catalyst and too high density of catalytic active sites can both decrease the catalytic activity. Alkalinity is not conducive to oxidation of THT with H2O2. More attractively, POM-PGMA/SiO2 could be well reused several times, stemming from the strong covalent bonding between the POM clusters and the polymers on SiO2 surface.
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