Selective Recognition of 2,4,6-Trichlorophenol by Molecularly Imprinted Polymers Based on Magnetic Halloysite Nanotubes Composites
Selective Recognition of 2,4,6-Trichlorophenol by Molecularly Imprinted Polymers Based on Magnetic Halloysite Nanotubes Composites
复制标题
基于磁性埃洛石纳米管复合材料的分子印迹聚合物选择性识别2,4,6-三氯苯酚
DOI：
10.1021/jp111120x
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发表时间：
2011-04-07
影响因子：
3.7
通讯作者：
Yan, Yongsheng
中科院分区：
文献类型：
--
作者：
Pan, Jianming;Yao, Hang;Yan, Yongsheng
在1-甲基-2-吡咯烷酮中，通过三乙酰丙酮铁的高温反应，将磁性纳米颗粒附着到羧酸功能化埃洛石纳米管（HNTs-COOH）上。然后，以磁性埃洛石纳米管为载体，合成了磁性分子印迹聚合物，并用于2，4，6-三氯苯酚的选择性识别。采用X射线衍射（XRD）、傅里叶变换红外（FT-IR）、热重分析（TGA）、振动样品磁强计（VSM）、透射电子显微镜（TEM）、元素分析和拉曼光谱对MMIPs进行了表征。MMIP具有印迹聚合物膜（5.0-15.0 nm），并表现出磁性（M-s = 2.74 emu g（-1））和热稳定性。批模式吸附研究进行了调查的特定吸附平衡，动力学和选择性识别。Langmuir等温线模型比Freundlich模型更好地拟合平衡数据，MMIP的单层吸附量在298 K时为246.73 mg g（-1）。MMIPs的动力学性质可以用准二级动力学方程、初始吸附速率和半吸附时间来描述。选择性识别实验表明TCP对结构相关的酚类化合物具有较高的亲和力和选择性，TCP与甲基丙烯酸（MAA）之间的氢键是主要的识别机制。MMIPs可再生，第5次使用时，在纯TCP溶液中的吸附容量损失约11.0%，在共存酚类化合物溶液中的吸附容量损失约16.1%。所制备的MMIPs成功地应用于环境样品中TCP的分离。
Magnetic nanoparticles were attached to carboxylic acid functionalized halloysite nanotubes (HNTs-COOH) by high-temperature reaction of ferric triacetylacetonate in 1-methyl-2-pyrrolidone. Then, based on magnetic halloysite nanotubes particles (MHNTs), the magnetic molecularly imprinted polymers (MMIPs) were synthesized for the selective recognition of 2,4,6-trichlorophenol (TCP). MMIPs were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) analysis, thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM), elemental analysis, and Raman spectroscopy. MMIPs were demonstrated with an imprinted polymer film (5.0-15.0 nm) and exhibited magnetic property (M-s = 2.74 emu g(-1)) and thermal stability. Batch mode adsorption studies were carried out to investigate the specific adsorption equilibrium, kinetics, and selective recognition. The Langmuir isotherm model was fitted to the equilibrium data better than the Freundlich model, and the monolayer adsorption capacity of MMIPs was 246.73 mg g(-1) at 298 K. The kinetic properties of MMIPs were well-described by the pseudo-second-order equation, initial adsorption rate, and half-adsorption time. The selective recognition experiments demonstrated high affinity and selectivity toward TCP over structurally related phenolic compounds, and hydrogen bonds between TCP and methacrylic acid (MAA) were mainly responsible for the recognition mechanism. In addition, MMIPs could be regenerated, and their adsorption capacity in the fifth use was about 11.0% loss in pure TCP solution, about 16.1% loss in coexisting phenolic compound solution. The MMIPs prepared were successfully applied to the separation of TCP from environmental samples.