Abstract
The molecular imprinting technique is a new method for preparing molecularly imprinted polymers (MIPs) with specific molecular recognition sites for individual target molecules. In this study, Ag2S-MIP-TiO2 nanocomposite was synthesized by a sol-gel-deposition method with ethyl p-hydroxybenzoate as an imprinting molecule. The obtained powder was characterized by XRD and other analytical methods. The results show that the obtained Ag2S-MIP-TiO2 nanocomposite demonstrates better catalytic performance than pure anatase TiO2. The degradation efficiency of ethyl p-hydroxybenzoate during 1.5 h of the photocatalytic reaction is 92.22%, which is 42% higher than pure TiO2. The selectivity factor for the treatment of ethyl p-hydroxybenzoate compared to phenol using Ag2S-MIP-TiO2 reached 3.571, which is 72% higher than pure TiO2.
Highlights
The molecular imprinting technique is a new method for preparing molecularly imprinted polymers (MIPs) with specific molecular recognition sites for individual target molecules
The characteristic peaks of Ag and S elements appeared in the spectrum of Ag2S-MIP-TiO2, which are derived from the doping of silver nitrate and thiourea
The shape of the peak of Ag2S-MIP-TiO2 is more than the absorption peak of Ag and S as compared to pure TiO2, indicating that silver and sulfur element are successfully doped into Ag2S-MIP-TiO2
Summary
The molecular imprinting technique is a new method for preparing molecularly imprinted polymers (MIPs) with specific molecular recognition sites for individual target molecules. Ag2S as a hybrid material was added to MIP-TiO2 to improve its photocatalytic activity and to treat wastewater selectively. The template molecule left the imprinted cavity on Ag2S-MIP-TiO2, which increased its ability to adsorb and identify target contaminants selectively, making TiO2 have higher catalytic activity and selective ability to remove E-pHB.
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