分子印迹氨基功能化纳米Fe_3O_4高分子磁性复合材料的合成及其对海水中2,4,6-三氯苯酚的吸附性能  

Synthesis of molecular printed amino-functionalized nano-Fe_3O_4-polymer magnetic composite and its adsorption properties on 2,4,6-trichlorophenol in seawater

作　　者：张佳丽[1] 叶然[2] 徐潇潇[1] 俞林佳 吕珊珊[1] 朱丽娜[1] 叶思[1] 沈昊宇[1] 夏清华[3] 

机构地区：[1]浙江大学宁波理工学院,宁波315100 [2]国家海洋局宁波海洋环境监测中心站,宁波315012 [3]湖北大学有机化工新材料湖北省协同创新中心,武汉430062

出　　处：《复合材料学报》2015年第4期1201-1210,共10页Acta Materiae Compositae Sinica

基　　金：浙江省自然科学基金(LY14B04003);宁波市自然科学基金(2014A610092);国家级大学生创新创业训练计划(201313022007);浙江省新苗计划(2013R401190)

摘　　要：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 realize selective adsorption and removal of 2, 4, 6-trichlorophenol （2, 4, 6-TCP） in seawa- ter, a 2, 4, 6-trichlorophenol-imprinted amino-funetionalized nano-Fe3 04-polymer magnetic composite （nFe3 04 @ MIPNH2-polymer） was synthesized via ultrasonic assisted suspension polymerization. The composition, structure, morphology and magnetism of nFe304 @ MIPNH2-polymer were characterized by means of Elemental Analysis （EA）, X-ray diffraction （XRD）, Fourier transform infrared （FTIR） spectroscopy, transmission electron microsco- py （TEM） and vibrating sample magnetometer （VSM）. The application for its adsorption and removal properties on 2, 4, 6-TCP pollutant from seawater was investigated. The results show that the nFe3 04 @MIPNH2-polymer has an average size of around 800 nm, with the saturation magnetization intensity of 32.6 emu · g-1. Adsorption isotherm of 2, 4, 6-TCP onto nFe3 04 @MIPNH2-polymer accords with Langmuir model, which demonstrate an excellent adsorption capacity with the maximum adsorption capacity at 105.26 mg · g-1 , much higher than that of nonemolecular imprinted amino functionalized nano-Fe3 O4-polymer magnetic material （nFe3 04 @ N H2-polymer, with the maximum adsorption capacity at 76. 92 mg @ g-1 ）. The isothermal adsorption curve mainly obeys the Langmuir mode. The adsorption thermodynamic studies suggest that the adsorption processes of the 2, 4, 6-TCP by the nFe304 @ MIPNH2-polymer are endothermic, entropy favored, and spontaneous in nature, and the adsorption processes reach the equilibrium within 5 min and the kinetic data are well fitted to the pseudo-second-order model. The activation energy for the 2, 4, 6-TCP removal is 78.0 kJ @ mol 1. There is almost no interference by the coexisting components in seawater for the adsorption of 2, 4, 6 TCP. The nFe3 04 @MIPNH2-polymer can be reused at least 5 times after elusion. The 2, 4, 6-TCP in seawater can be selectively and effectively removed by the nFe3 04 @ MIPNH2-polymer.

关 键 词：分子印迹 纳米FE3O4 高分子 磁性复合材料 2 4 6-三氯苯酚 吸附性能 NANO-FE3O4 

分 类 号：TB332[一般工业技术—材料科学与工程]