Preparation and properties of double-template magnetic molecularly imprinted polymers for removal of nitrophenol from drinking water
In order to efficiently remove 4-nitrophenol(4-NP)and 2,4-dinitrophenol(2,4-DNP),4-NP and 2,4-DNP were used as template molecules and double-template magnetic molecularly imprinted polymers(D-MIPs)were prepared by surface molecular imprinting technology using itaconic acid as functional monomer,Fe3O4@SiO2 as carrier,ethylene glycol dimethacrylate as crosslinking agent and azodiisobutyronitrile as initiator.The morphology of D-MIPs was characterized using FT-IR and SEM.The adsorption specificity,regenerability,and applicability of D-MIPs were studied in detail.The results show that D-MIPs successfully coated the surface of the Fe3O4@SiO2 carrier and had a good polymerization effect,specific recognition sites,and good imprinting performance,with a diameter of 90 nm and homogeneous shape.The theoretical adsorption capacities of 4-NP-MIPs,2,4-DNP-MIPs,and D-MIPs for target molecules were 103.97,73.14 and 123.99 mg/g,respectively.There were many adsorption sites with different adsorption energies.D-MIPs reached the optimal adsorption equilibrium state in 30 min.The best fitting models for the MIPs were the Freundlich adsorption and pseudo-second-order kinetic models,indicating that adsorption of MIPs occurred via a chemical adsorption process.Test results show that MIPs had highly specific recognition and selective adsorption capacity in different water samples.After eight regeneration cycles,the adsorption capacity of D-MIPs decreased by 7.51%,confirming that MIPs had excellent regeneration.
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment,Ministry of Education,College of Environment and Ecology,Chongqing University,Chongqing 400045,China
4-硝基苯酚 2,4-二硝基酚 双模板 分子印迹聚合物 吸附性能
National Natural Science Foundation of ChinaInternational Postdoctoral Exchange Fellowship Program,China
NETL
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