The preparation and characterization of photo-responsive sol-gel materials for 2,4-dichlorophenoxyacetic acid by surface imprinting

Cheng-Bin GONG, Yu-Zhu YANG, Chao GAO, Qian TANG, Cheuk Fai Stephen CHOW, Jing-Dong PENG, Michael Hon-Wah LAM

Research output: Contribution to journalArticles

14 Citations (Scopus)

Abstract

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 × 10⁴ M ¹. Density of receptor sites in the SMIP material is 10.59 μmol/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. Copyright © 2013 Springer Science+Business Media New York.
Original languageEnglish
Pages (from-to)442-450
JournalJournal of Sol-Gel Science and Technology
Volume67
Issue number3
Early online dateJun 2013
DOIs
Publication statusPublished - Sep 2013

Citation

Gong, C.-B., Yang, Y.-Z., Gao, C., Tang, Q., Chow, C.-F., Peng, J.-D., & Lam, M. H.-W. (2013). The preparation and characterization of photo-responsive sol-gel materials for 2,4-dichlorophenoxyacetic acid by surface imprinting. Journal of Sol-Gel Science and Technology, 67(3), 442-450.

Keywords

  • Surface imprinting
  • 2,4-Dichlorophenoxyacetic acid
  • Sol gel materials
  • Photo-responsive

Fingerprint Dive into the research topics of 'The preparation and characterization of photo-responsive sol-gel materials for 2,4-dichlorophenoxyacetic acid by surface imprinting'. Together they form a unique fingerprint.