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.
Highlights
2-Hydroxybenzoic acid (2-HA) was prepared by a surface imprinting technique with a sol-gel process
Bond around 1594.40 cm−1, and a C=O bond around 1627 cm−1 (Figure 3). These results further indicate that –NH2 had been grafted onto the surface of activated silica gel after modification, so the APTES had been combined with the surface of the functionalized silica gel sorbent
The selectivity adsorption experiments were conducted by preparing a single solution of 3-Hydroxybenzoic acid (3-HA), 4-Hydroxybenzoic acid (4-HA) and phenol solution with each initial concentration of 10 ppm. 3-HA, 4-HA or phenol was used as the comparative agents since their chemical molecular structures are similar to 2-HA to a certain extent
Summary
2-Hydroxybenzoic acid (2-HA), known as salicylic acid, is a colorless acicular crystal and is an organic micro-molecular compound It is widely used in many pharmaceutical and cosmetic formulations, as it is produced from hydrolytic deacetylation of the common drug acetylsalicylic acid (aspirin) [1]. Studies on MIPs for 2-HA as a template have been well documented over the past years by bulk polymerization and emulsion polymerization [18,19,20] Most of these materials exhibit high affinity and selectivity [21], but they possess low binding capacity and poor site accessibility to target analytes [22]. We report on a highly selective imprinted silica gel sorbent with binding sites situated at the surface for selective removal and separation of 2-HA. A validation method was established for the determination of 2-HA in a cosmetics sample
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