The molecular imprinting technique is a new method for preparing molecularly imprinted polymers (MIPs) with specific molecular recognition sites for certain target molecules. In this study, a novel, facile preparation method was presented, called "seed precipitation polymerization," for the synthesis of MIPs via surface imprinting and a support matrix. In the polymerization process, kaempferol was used as the template molecule, methacrylic acid as the functional monomer, nano-TiO 2 as the support, azodiisobutyronitrile as the initiator, and ethylene glycol dimethacrylate as the crosslinker in acetonitrile solvent. The synthesized T-MIP and MIP were analyzed by infrared spectroscopy and scanning electron microscopy. In addition, the obtained polymers were evaluated by adsorption isotherms and dynamic curves for their selective recognition properties for kaempferol. The results show that T-MIP shows regular spherical particles; the adsorption dynamic curves of T-MIP show that the adsorption capacity increases with time and reaches a maximum value and then finally reaches equilibrium, and the T-MIP exhibits a higher affinity for kaempferol than does the MIP. The adsorption follows pseudo-second-order kinetics, the Freundlich adsorption equation fits the experimental data well, and there is strong evidence for multiple-layer adsorption.
A B S T R A C TMolecularly imprinting polymers (MIPs) are a class of highly cross-linked polymer with specific binding sites for a target molecule. In this study MIPs were prepared by precipitation polymerization, using kaempferol as the template molecule, methacrylic acid as the functional monomer, azodiisobutyronitrile as the initiator, and ethylene glycol dimethacrylate as the cross-linker in acetonitrile solvent. The synthesized kaempferol-MIP and nonimprinted polymer (NIP) were analyzed by infrared spectroscopy and scanning electron microscope. In addition, the obtained polymers were evaluated by adsorption isotherms and dynamic curves with their selective recognition properties for kaempferol. The experimental results show that (1) the imprinted polymers are spherical morphology; (2) the adsorption dynamic curves of kaempferol-MIP and NIP indicate that the specific adsorption increases with time extension and reaches saturation in a short period, and the kaempferol-MIP exhibits a higher affinity for kaempferol than the NIP; (3) the Scatchard analysis reveals that there exists a class of homogenous recognition sites in kaempferol-MIP; apparent maximal combination amount (Q max ) and equilibrium dissociation constant (K d ) were calculated to be 2140 lg/g and 5.77 mg/L, respectively.
2013) Evaluation of ultrafiltration membranes with the multimedia filter/ultrafiltration/reverse osmosis/NH 3 -N remover system to treat surface water, Desalination and A B S T R A C TThis study discussed the feasibility for the multimedia filter/UF/RO/NH 3 -N remover system to treat river Tang surface water, and three different polysulfone (PSf) membranes with molecular weight cut off of 80, 100, and 300 kDa were tested to select a UF membrane for low membrane fouling, higher flux, low transmembrane pressure and better quality of the permeate. The results showed that the multimedia filter/UF/RO/NH 3 -N remover combined system was able to remove all unwanted elements and to produce consistent and high-quality water. For the whole experiment, K of RO system basically stabilized at 2.8 L/m 2 h·bar. RO system could effectively remove NH 3 -N and conductivity. Comparing results from three UF membranes experiments, it was found that three UF membranes could remove particles (colloids) and the 100 kDa PSf membrane was the most suitable membrane to treat the river Tang.
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