Study On Selective Photodegradation Of Antibiotic Residues In Water Over Magnetic Imprinted Photocatalytic Materials

Antibiotic residues seriously endanger human health and safety.Long-term consumption of water or food containing antibiotic residues can cause antibiotic residues to accumulate in the human body.The long-term accumulation of antibiotic residues in the human body not only causes damage to the liver and kidney,but also causes allergies reaction,allergic reaction and imbalance of the intestinal flora.Therefore,the removal of antibiotic residues in water has attracted the attention of more and more researchers.Photocatalytic technology is considered to be one of the most effective methods to degrade antibiotic residues due to its advantages of energy saving,rapid reaction and strong oxidation.Ordinary photocatalysts have problems such as low selectivity,low photocatalytic activity and difficulty in recovery.Therefore,magnetic imprinted photocatalytic materials are prepared by combining photocatalytic technology with surface imprinting technology to solve the above problems,the specific content is as follows:?1?The surface of MFA is coated with g-C₃N₄ by high-temperature calcination,and PPy is loaded on the surface of g-C₃N₄ by ultrasonication.Afterwards,PPy@g-C₃N₄@MFA imprinted photocatalyst is prepared by microwave polymerization.Due to the presence of three-dimensionally imprinted cavities,the PPy@g-C₃N₄@MFA imprinted photocatalyst can selectively adsorb and degrade TC.The degradation rate?35.10%?of TC over PPy@g-C₃N₄@MFA imprinted photocatalyst is lower than that of CIP?17.2%?over PPy@g-C₃N₄@MFA imprinted photocatalyst.Moreover,the selectivity coefficients of PPy@g-C₃N₄@MFA imprinted photocatalyst relative to g-C₃N₄@MFA,PPy@g-C₃N₄@MFA and non-imprinted photocatalyst is 1.587,1.756 and2.580,respectively.Therefore,the PPy@g-C₃N₄@MFA imprinted photocatalyst prepared in this experiment can selectively adsorb and degrade TC.?2?The PPy embedded magnetic imprinted photocatalyst based on MFA is prepared by photopolymerization.Different PPy embedded magnetic imprinted photocatalysts are synthesized by adjusting the addition amount of pyrrole and polymerization time.In this experiment,the optimal addition amount of pyrrole is 70?L,and the optimal polymerization time is 15 min.The PPy embedded magnetic imprinted photocatalyst can specifically adsorb and selectively degrade TC due to the presence of three-dimensionally imprinted cavities.In this experiment,the degradation rate of TC over PPy embedded magnetic imprinted photocatalyst was 77.59%,which was more than twice that of CIP?34.57%?,and the selectivity coefficient of PPy@CdS@MFA imprinted photocatalyst relative to CdS,CdS@MFA and non-imprinted photocatalyst is 0.71,1.79 and 1.64,respectively.Therefore,the PPy embedded magnetic imprinted photocatalyst prepared in this experiment can selectively adsorb and degrade TC.?3?POPD-CdS is synthesized by chemical oxidation to ensure full contact between CdS and POPD,afterwards,POPD-CdS is introduced as functional monomer into surface imprinting layer by photopolymerization,and MFA is introduced as carrier to prepare the POPD-CdS embedded magnetic imprinted photocatalyst.Due to the presence of three-dimensionally imprinted cavities,The POPD-CdS embedded magnetic imprinted photocatalyst can specifically adsorb and selectively degrade CIP.Under visible light irradation,the degradation rate of CIP over POPD-CdS embedded magnetic imprinted photocatalyst is 63.42%,which is higher than that of TC?35.33%?over POPD-CdS embedded magnetic imprinted photocatalyst.Moreover,the selectivity coefficients of POPD-CdS embedded magnetic imprinted photocatalyst relative to CdS,POPD-CdS and non-imprinted photocatalysts is 1.88,1.98 and 2.12,respectively.Therefore,the prepared POPD-CdS embedded magnetic imprinted photocatalyst can selectively adsorb and degrade CIP.