Thermosensitive molecularly imprinted polymers on porous carriers: preparation, characterization and properties as novel adsorbents for bisphenol A.
Thermosensitive molecularly imprinted polymers on porous carriers: preparation, characterization and properties as novel adsorbents for bisphenol A.
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DOI：
10.1016/j.talanta.2014.06.055
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发表时间：
2014-12
期刊：
影响因子：
6.1
通讯作者：
Ruichen Dong;Jinhua Li;H. Xiong;Wenhui Lu;Hailong Peng;Lingxin Chen
中科院分区：
文献类型：
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作者：
Ruichen Dong;Jinhua Li;H. Xiong;Wenhui Lu;Hailong Peng;Lingxin Chen
利用4-乙烯基吡啶（VP）和n -异丙基丙烯酰胺（NIPAM）双功能单体协同作用，制备了多孔载体上的热敏分子印迹聚合物（T-MIPs），并通过温度调节对双酚A （BPA）进行选择性识别和控制吸附与释放。通过对聚苯乙烯进行多步溶胀法制备多孔聚合物载体，并将具有温度响应性的NIPAM和碱性VP单体简单接枝在其上。所得的T-MIPs具有高的结合能力和快速的吸附动力学，吸附过程符合Langmuir-Freundlich等温线和准二级动力学模型。在较低的临界溶液温度（33℃）下，吸附量随温度的升高（如20℃）略有增加，高于临界溶液温度（如50℃）时，吸附量下降较快。随后，将T-MIPs作为新型吸附剂用于海水和酸奶样品的选择性固相萃取（SPE）。在环境温度（20℃）下，加样回收率为94.83 ~ 98.47%，精密度为3.21%。通过6次吸附-解吸循环，可重复使用的T-MIPs具有良好的回收率，相对标准误差在9.8%以内。智能T-MIPs通过简单的刺激响应调控在选择性鉴定、吸附/释放和去除BPA方面具有很大的潜力。
Thermosensitive molecularly imprinted polymers (T-MIPs) on porous carriers were preparedviathe synergy of dual functional monomers of 4-vinylpyridine (VP) and N-isopropylacrylamide (NIPAM), for selective recognition and controlled adsorption and release of bisphenol A (BPA) by the temperature regulation. The porous polymer supporter was synthesized by multistep swelling of polystyrene and then both the NIPAM with temperature responsiveness and the basic monomers of VP were grafted on them in a simple way. The resultant T-MIPs showed high binding capacity, fast kinetics, and the adsorption processes were found to follow Langmuir–Freundlich isotherm and pseudo-second-order kinetic models. The adsorption capacity increased slightly along with the rise of temperature (such as 20 °C) under lower critical solution temperature (LCST, 33 °C) and decreased fast above LCST (such as 50 °C). Subsequently, the T-MIPs were employed as novel adsorbents for selective solid-phase extraction (SPE) of BPA from seawater and yogurt samples. Satisfying recoveries in the range of 94.83–98.47% were obtained with the precision of 3.21% at ambient temperature (20 °C). Through 6 adsorption–desorption cycles, the reusable T-MIPs exhibited a good recoverability with the relative standard error within 9.8%. The smart T-MIPs provided great potentials for selective identification, adsorption/release and removal of BPA by simple stimuli responsive regulation.