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Abstract: Inorganic-framework molecularly imprinted TiO2 (MIP-TiO2) was successfully prepared by sol-hydrothermal method using tetrabutyl orthotitanate as the precursor of functional monomer and 4-nitrophenol (4NP) as template molecule. The regeneration ability of MIP-TiO2 was studied. The spent MIP-TiO2 was regenerated by water washing and heat treatment. The photocatalytic activity of MIP-TiO2 regenerated by water washing is enhanced, while that of heat regenerated MIP-TiO2 decreases remarkably in the third cycle. The results indicate that water washing is an more effective regeneration method than heat treatment, and MIP-TiO2 exhibits excellent regeneration ability. The possible reasons for enhanced photocatalytic activity of regenerated MIP-TiO2 by water washing are that (i) MIP-TiO2 exhibits stable inorganic framework, (ii) water washing increases the specific surface areas, and (iii) the insertion of carbon in the TiO2 lattice which can decrease the recombination rates, thus enhancing the photocatalytic activity of TiO2
Template and target information: 4-nitrophenol, 4-NP
Author keywords: heat treatment, Molecularly imprinted photocatalyst, Regeneration, water washing