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Abstract: A photoresponsive functional azobenzene monomer containing silica was prepared by covalent imprinting for 2,4-dicholrophenoxyacetic acid (2.4-D) via oxidation-coupling reaction, acetylation and esterification reaction using commercially available p-nitrophenol, 2,4-dicholrophenoxyacetic acid and 3-chloropropyltriethoxysilane as the starting materials. Photo-responsive molecular imprinted polymer (MIP) for 2,4-D was then successfully prepared by sol-gel process. The photoresponsive performance of the MIP is reversible and repeatable. The MIP shows specific affinity to 2.4-D and reversible uptake and release of 2.4-D upon alternate irradiation at 365 and 440 nm, respectively. Scatchard analysis shows that the maximal number of recognition sites (Qmax) and binding constant (Kd) was 5.79 μmol/g and 2.6 x 10-5 M-1. Binding kinetics of 2,4-D on MIP demonstrates that it only took 80 min for MIP to achieve the sorption equilibrium. As characterized by atomic force microscope, the morphology of MIP is sphere and the diameter of the spheres ranges in 150-200 nm.
Template and target information: 2,4-dichlorophenoxyacetic acid, 2,4-D
Author keywords: 2,4-dichlorophenoxyacetic acid, Photoresponsive Organic silica azobenzene, covalent imprinting, sol-gel, molecular imprinted polymer