论文部分内容阅读
为了实现海水中2,4,6-三氯苯酚(2,4,6-TCP)的选择性吸附和去除,采用超声协助悬浮聚合法以2,4,6-三氯苯酚为模板制备了分子印迹氨基功能化纳米Fe3O4高分子磁性复合材料(nFe3O4@MIPNH2-polymer)。通过元素分析(EA)、X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱分析、透射电子显微镜(TEM)、振动样品磁强计(VSM)等手段对nFe3O4@MIPNH2-polymer的组成、结构、形貌、磁性等进行表征,并研究了其应用于吸附和去除海水中2,4,6-三氯苯酚(2,4,6-TCP)污染物的性能。结果表明:合成的nFe3O4@MIPNH2-polymer平均粒径约为800nm,饱和磁化强度为32.6emu·g-1;水溶液中2,4,6-TCP的饱和吸附量为105.26mg·g-1,高于非分子印迹氨基功能化纳米Fe3O4高分子磁性复合材料(nFe3O4@NH2-polymer)的饱和吸附量(76.92mg·g-1),nFe3O4@MIPNH2-polymer对2,4,6-TCP的等温吸附线大体符合Langmuir模型。吸附热力学研究表明,nFe3O4@MIPNH2-polymer对2,4,6-TCP的吸附过程是自发的吸热熵增过程;吸附过程可在5min内达到平衡,动力学数据和准二级动力学模型符合较好;其吸附过程去除2,4,6-TCP的活化能为78.0kJ·mol-1。海水中的共存物质对吸附2,4,6-TCP几乎无干扰,nFe3O4@MIPNH2-polymer经洗脱后可以循环使用5次以上。nFe3O4@MIPNH2-polymer能高选择性地有效去除海水中的2,4,6-TCP。
In order to achieve the selective adsorption and removal of 2,4,6-trichlorophenol (2,4,6-TCP) in seawater, the molecule was prepared using 2,4,6-trichlorophenol as template by ultrasonic assisted suspension polymerization Imprinted amino-functionalized nano-Fe3O4 polymer magnetic composite (nFe3O4 @ MIPNH2-polymer). The composition of nFe3O4 @ MIPNH2-polymer was characterized by elemental analysis, X-ray diffraction, FTIR, TEM, , Structure, morphology, magnetism and so on, and its performance for adsorption and removal of 2,4,6-trichlorophenol (2,4,6-TCP) pollutants in seawater was studied. The results showed that the average particle size of synthesized nFe3O4 @ MIPNH2-polymer was about 800 nm and the saturation magnetization was 32.6 emu · g-1. The saturated adsorption capacity of 2,4,6-TCP in aqueous solution was 105.26 mg · g-1 The adsorption capacity of nFe3O4 @ MIPNH2-polymer to isothermal adsorption of 2,4,6-TCP for non-molecularly imprinted amino functionalized nano-Fe3O4 magnetic composite (nFe3O4 @ NH2-polymer) was 76.92 mg · g-1 The line generally follows the Langmuir model. Adsorption thermodynamics studies show that the adsorption process of 2,4,6-TCP by nFe3O4 @ MIPNH2-polymer is a spontaneous endothermic entropy increase process; the adsorption process can reach equilibrium within 5 min, and the kinetic data are in accordance with the quasi-second-order kinetic model The adsorption energy of 2,4,6-TCP removal was 78.0 kJ · mol-1. Coexisting substances in seawater have almost no interference with 2,4,6-TCP adsorption, and nFe3O4 @ MIPNH2-polymer can be recycled 5 times or more after being eluted. nFe3O4 @ MIPNH2-polymer can selectively remove 2,4,6-TCP in seawater with high selectivity.