Abstract
Parabens are esters of p-hydroxybenzoic acid and are commonly used as preservatives in personal care products, pharmaceutical drugs and foodstuffs. The main concern arises from their endocrine disrupting potential. Investigations were carried out for the separation of methylparaben from aqueous solution by emulsion liquid membrane. Extraction efficiency of 93.54% was achieved using emulsion consisting of 2% w/v TOA, 2% w/v Span 80 and 0.1 N NaOH. Box-Behnken Design approach was used to optimize the process variables. Studies were also carried out to investigate the influence of hydrophile-lipophile balance (HLB) and Multiwall carbon nanotubes (MWCNT) on the emulsion stability. Characterization of emulsions were performed using Photomicrographs, Dynamic light scattering, Turbiscan, Atomic force microscope and Fourier transform infrared spectroscopy. 100% extraction was obtained at a contact time of 10 minutes using 2% w/v blended surfactant: Span 80 and Span 20 (HLB 5.7) with MWCNT. Multiple cycles studies revealed that the emulsion can be used in batch process up to fourth cycle without de-emulsification.
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