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Synthesis and Evaluation of Molecularly Imprinted Silica Gel for 2-Hydroxybenzoic Acid in Aqueous Solution
Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
* Author to whom correspondence should be addressed.
Received: 13 November 2012; in revised form: 12 January 2013 / Accepted: 13 February 2013 / Published: 14 March 2013
Abstract: A molecularly imprinted silica gel sorbent for selective removal of 2-Hydroxybenzoic acid (2-HA) was prepared by a surface imprinting technique with a sol-gel process. The 2-HA molecularly imprinted silica gel (2-HA-MISG) sorbent was evaluated by various parameters, including the influence of pH, static, kinetic adsorption and selectivity experiments. The optimum adsorption capacity to the 2-HA appeared to be around pH 2 by the polymer. Morevoer, the imprinted sorbent displayed fast uptake kinetics, obtained within 20 min. The adsorption capacity of the 2-HA-MISG (76.2 mg g−1) was higher than that of the non-imprinted silica gel (NISG) (42.58 mg g−1). This indicates that the 2-HA-MISG offers a higher affinity for 2-HA than the NISG. The polymer displays good selectivity and exhibits good reusability. Experimental results show the potential of molecularly imprinted silica sorbent for selective removal of 2-HA.
Keywords: molecularly imprinted silica gel; 2-Hydroxybenzoic acid; functionalized silica gel
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Raof, S.F.A.; Mohamad, S.; Abas, M.R. Synthesis and Evaluation of Molecularly Imprinted Silica Gel for 2-Hydroxybenzoic Acid in Aqueous Solution. Int. J. Mol. Sci. 2013, 14, 5952-5965.
Raof SFA, Mohamad S, Abas MR. Synthesis and Evaluation of Molecularly Imprinted Silica Gel for 2-Hydroxybenzoic Acid in Aqueous Solution. International Journal of Molecular Sciences. 2013; 14(3):5952-5965.
Raof, Siti F.A.; Mohamad, Sharifah; Abas, Mhd R. 2013. "Synthesis and Evaluation of Molecularly Imprinted Silica Gel for 2-Hydroxybenzoic Acid in Aqueous Solution." Int. J. Mol. Sci. 14, no. 3: 5952-5965.