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Reference type: Journal
Authors: Sun YL
Article Title: Molecularly imprinted polymer for 2, 4-dichlorophenoxyacetic acid prepared by a sol-gel method.
Publication date: 2014
Journal: Journal of Chemical Sciences
Volume: 126
Issue: (4)
Page numbers: 1005-1011.
DOI: 10.1007/s12039-014-0672-2
Alternative URL: http://www.ias.ac.in/chemsci/Pdf-Jul2014/1005.pdf

Abstract: Based on a sol-gel procedure, a molecularly imprinted polymer (MIP) for 2,4-dichlorophenoxyacetic acid (2,4-D) was synthesized, using phenyltrimethoxysilane (PTMOS), aminopropyltriethoxysilane (APTES) as monomers and tetraethoxysilane (TEOS) as cross-linking agent. In addition to the amount of the template, some factors in the sol-gel process: TEOS/APTES/PTMOS molar ratio, H2O/Si molar ratio, CH3CH2OH/Si molar ratio, etc. were investigated in detail. Results show that the optimum conditions for the preparation of the MIPs were 20:1.5:1 (TEOS: APTES: PTMOS), ca. 4 (H2O/Si), ca. 4 (CH3CH2OH/Si), respectively. Effects of various parameters involved in the adsorption process of 2,4-D on MIP such as incubation time, pH, etc. were also evaluated. It is found that the adsorption attained equilibrium within 3 h, the optimum pH for adsorption was about 7 and the adsorption obeyed Langmuir model. Test results also demonstrated that the present MIP for 2,4-D had large adsorption capacity (the maximum adsorption concluded from Langmuir model reached 243.3 mg/g) and good selectivity.
Template and target information: 2,4-dichlorophenoxyacetic acid, 2,4-D
Author keywords: molecular imprinting, sol-gel, 2,4-dichlorophenoxyacetic acid, adsorption


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