Hua-Wei Chen, C. Chiou, Shu-Han Chang
Apr 15, 2017
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Influential Citations
45
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Journal
Powder Technology
Abstract
Abstract Parabens (such as methylparaben (MP), ethylparaben (EP) and propylparaben (PP)) are widely used as preservatives in food, medicine and cosmetic products but can destroy the cell membrane of microbes, intracellular protein and the enzyme activity of microbial cells. In this study, the surface of magnetite was modified with styrene (St) as the functional monomer, divinylbenzene (DVB) as the cross-linking agent, polyvinyl pyrrolidone (PVP) as the stabilizer, 2,2-azodiisobutyronitrile (AIBN) as the radical initiator and ethanol as the solvent to prepare magnetic nanoparticles with a phenyl group (PS/Fe 3 O 4 ) and use this phenyl compound to absorb parabens. The adsorption behaviors of MP, EP and PP on PS/Fe 3 O 4 were almost totally pH-independent because the phenyl ring of PS/Fe 3 O 4 adsorbs MP, EP and PP by π–π electron-donor–acceptor interactions. The Langmuir isotherm indicated that the maximum adsorption capacity of PS/Fe 3 O 4 followed the order of PP (3.5421 mg g − 1 ) > EP (3.2862 mg g − 1 ) > MP (0.6015 mg g − 1 ) possibly owing to the hydrophilic and hydrophobic properties. The mechanism of adsorption confirmed that the adsorption process of MP, EP and PP followed the second-order kinetic model, which suggested that the adsorption process was quite rapid and was probably dominated by a chemical adsorption phenomenon.