Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 67, Issue 3, Pages 442-450Publisher
SPRINGER
DOI: 10.1007/s10971-013-3098-2
Keywords
Surface imprinting; 2,4-Dichlorophenoxyacetic acid; Sol-gel materials; Photo-responsive
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Funding
- National Natural Science Foundation of China [20872121]
- Croucher Chinese Visitorships
- Research Funds for the Doctoral Program of Higher Education of China [20090182120010]
- Southwest University Doctoral Fund [SWUB2008075]
- CQ CSTC [2013jcyjA50026]
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The primary objective of this work is to develop a photo-responsive surface molecularly imprinted polymer (SMIP) for 2,4-dichlorophenoxyacetic acid (2,4-D) to overcome the shortcomings of conventional molecularly imprinted polymers. A photo-responsive functional monomer was firstly prepared by covalent connecting azobenzene and 2,4-D. The photo-responsive SMIP was then prepared on SiO2 nanoparticles via sol-gel process, and 2,4-D was removed via hydrolysis in acid. The SMIP 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. The favorable binding strength of the imprinted receptor sites in the SMIP for 2,4-D is found to be 2.51 x 10(4) M-1. Density of receptor sites in the SMIP material is 10.59 mu mol/g SMIP. The SMIP requires a shorter time to reach equilibrium than does the conventional molecularly imprinted polymer. The well-defined core-shell structure was clearly visualized by high resolution transmission electron microscopy.
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