Molecularly imprinted open porous membranes made from Pickering W/O HIPEs for selective adsorption and separation of methyl 4-hydroxybenzoate

• Published in: Chinese chemical letters 2015-08, Vol.26 (8), p.1036-1041
• Main Authors: Luo, Hong-Yu, Zhang, Min, Si, Nai-Chao, Meng, Min-Jia, Yan, Li, Zhu, Wen-Jing, Li, Chun-Xiang
• Format: Article
• Language: English
• Subjects: Methyl 4-hydroxybenzoate; Molecular imprinting technology; Open porous membrane; PolyHIPEs; 丙烯酸2-乙基己酯; 分子印迹技术; 动力学数据; 吸附分离; 多孔膜; 对羟基苯甲酸甲酯; 选择性吸附; 非离子表面活性剂
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2015.04.007

In this study, novel molecularly imprinted open porous membranes（MIOPMs） were prepared using the Pickering HIPEs template method and molecular imprinting technology for selective adsorption and separation of methyl 4-hydroxybenzoate（M4HB）. The template M4 HB, functional monomers,crosslinker and plastifier 2-ethylhexyl acrylate（2-EHA） were contained in the oil phase. Hydrophobic silica nanoparticles（HNP-SiO2） were employed as a stabilizer to establish stable W/O Pickering HIPEs with nonionic surfactant sorbitantrioleate（Span 85）. The results of SEM and FTIR indicated that the optimal MIOPMs were prepared successfully and possessed open and interconnecting pores. Then, the MIOPMs were used as sorbents for M4 HB. The correlation coefficient（R^2） values for the Langmuir–Freundlich isotherm model and pseudo-second-order kinetic model fitting to the adsorption equilibrium and kinetic data respectively were all higher than 0.95. The maximum adsorption capacity and the time of rapid adsorption for MIOPM4 were 4.146 mg g^-1 and 100 min, respectively. In addition, the permeability separation factor of MIOPMs for M4 HB compared to a structurally related analog methyl2-hydroxybenzoate（M2HB） could reach 3.122.