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Abstract: Methyl orange molecularly imprinted polymers (MO-MIPs) were prepared by swelling and polymerization method using different solvents and methyl orange (MO) as template, acrylamide (AM) as functional monomer, ethylene glycol dimethyl acrylate (EDMA) as crosslinking agent, azodiisobutyronitrile (AIBN) as initiator, dibutyl phthalate (DBP) as the sweller, and polystyrene microspheres as the seed. Corresponding infrared spectra and its adsorption capacity on the template molecules were studied. The best solvent was used for the determination of optimal dosage, and the results show thatthe MO-MIPs has the best adsorption capacity for MO at the dosage of 10 m L. MO-MIPs prepared under the optimal conditions were chosen for the determination of best pH, scatchard curve analysis, curve fittingfor thermodynamic model and recycling time test. The study showed that the optimal p H was 6, and there were two classes of binding sites in the process of adsorption. Among them, the equilibrium dissociation constant and maximum adsorption amount ofhigh-affinity binding sites were calculated to be 3.59 mg/L and 1.87 mg/g, respectively, while the values for low-affinity binding siteswere33.43 mg/L and 5.47 mg/g, respectively. Thermodynamic model was more consistent with the Freundlich model. There was no significant decline trend ofthe adsorption amount after eight times of recycle.
Template and target information: methyl orange, MO