多壁碳纳米管表面苯酚印迹聚合物的合成及性能研究

发布时间：2018-01-08 07:16

本文关键词：多壁碳纳米管表面苯酚印迹聚合物的合成及性能研究　出处：《太原理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：分子印迹技术合成的聚合物具有预构定型特异识别性以及实用性,受到科研工作者的广泛关注。由于传统的聚合方法具有很多缺点,费时费力产率低,合成出的聚合物交联度较高,模板分子被牢固的固定在内部,很难被完全洗脱。此外,印迹位点包埋过深导致吸附平衡时间较长,使其应用受到限制。而多壁碳纳米管是一种具有高比表面积和高反应活性的纳米材料,具有很多优良特性,使它可以作为分子印迹聚合物的载体材料。为了弥补传统聚合方法的缺点,利用多壁碳纳米管的优异性能,提出了基于多壁碳纳米管表面新型分子印迹材料,这种印迹材料中的分子识别位点分布在印迹材料的表面,可以使印迹识别位点与模板分子快速结合,能显著改善在介质中对特定化合物的可接近性,使得多壁碳纳米管表面分子印迹材料在痕量物质富集领域中显示出广阔的应用前景。本论文具体研究内容如下:(1)以苯酚为模板分子,采用沉淀聚合法在碳纳米管表面制备了多壁碳纳米管表面苯酚印迹材料。优化多壁碳纳米管表面苯酚印迹材料的制备条件和吸附条件;用扫描电镜和红外光谱表征该苯酚印迹材料的形貌特征;采用紫外分光光度法考查该印迹材料对苯酚的动态吸附和等温吸附,并且进行斯卡查德(Scatchard)模型分析;通过对苯酚类似物的吸附测定印迹材料的特异性吸附性能。结果显示印迹材料对苯酚的最大吸附量达到25.50mg/g;当动态吸附90 min时,吸附量达到了最大吸附量的90%以上,吸附接近平衡,实现了快速吸附的目的。印迹因子最大达到3.64,选择因子最大为2.78,说明了该印迹材料具有较好的特异性和选择性吸附性能。(2)以二氧化硅改性的多壁碳纳米管为基体,氨丙基三乙氧基硅烷为功能单体,正硅酸乙酯为交联剂,采用溶胶-凝胶法制备二氧化硅修饰的多壁碳纳米管表面苯酚印迹材料。对该印迹聚合材料的结构和形貌进行表征,并对苯酚的动力学吸附、等温吸附及特异性吸附等性能进行了测定。实验结果显示,多壁碳纳米管表面成功的合成了苯酚印迹层,制备得到苯酚印迹材料。此印迹材料对模板分子最大表观结合量为19.90 mg/g,只有一种结合位点,印迹因子最大达到3.48,选择性因子最大为3.44,该印迹材料在120 min达到动态吸附平衡。因此证明该印迹材料具有大量的印迹位点和良好的吸附能力。(3)把已制备好的苯酚印迹材料装入固相萃取小柱,对化妆品中的苯酚进行富集分离,结合高效液相色谱法进行测定。实验结果表明,此固相萃取柱可以很好的富集分离化妆品中的苯酚。
[Abstract]:Molecular imprinting technology synthetic polymers with prefabricated stereotypes? Specific recognition and practicability, is widely concerned by researchers. Because the traditional polymerization method has many shortcomings, time-consuming and laborious?? low yield, the synthesized polymer crosslinking degree, molecular template is firmly fixed in the interior, it is difficult to be completely eluted. In addition, imprinted sites are embedded too deep lead to longer adsorption equilibrium, which limits its applications. And multi walled carbon nanotubes is a kind of nano material with high specific surface area and high activity, has many excellent characteristics, so that it can be used as carrier material of molecularly imprinted polymer. In order to make up for the traditional polymerization method disadvantages of using excellent properties of multi walled carbon nanotubes, put forward multi walled carbon nanotube surface molecularly imprinted materials based on the imprinted materials in molecular recognition sites in imprinted material The surface of the material, can make imprinted recognition sites and template molecule rapid combination can significantly improve in the medium for compound specific accessibility, making multi walled carbon nanotube surface molecular imprinting materials show broad application prospects in the field of enrichment of trace substances. The specific contents are as follows: (1) from phenol the template molecule was prepared by polymerization of multi walled carbon nanotube surface phenol imprinted material on the surface of carbon nanotubes. Preparation of precipitated conditions and adsorption conditions of preparation and optimization of multi walled carbon nanotube surface with phenol imprinted materials; morphology scanning electron microscopy and infrared spectroscopy characterization of the phenol imprinted material; UV on phenol adsorption and dynamic isothermal adsorption spectrophotometric method to examine the imprinted material, and Scatcherd (Scatchard) model; through the specific adsorption of phenol analogues of the determination of imprinted material absorption Report of performance. The results show that the maximum adsorption capacity of phenol imprinted material reached 25.50mg/g; when the dynamic adsorption of 90 min, the adsorption capacity reached more than 90% of the maximum adsorption capacity, adsorption close to balance, to achieve a rapid adsorption. The imprinting factor selection factor achieves 3.64, a maximum of 2.78, shows that the imprinted material has specific and the selective adsorption performance. (2) with multi walled carbon nanotubes modified silica matrix aminopropyltriethoxysilane as functional monomer, TEOS as crosslinking agent, multi walled carbon nanotube surface imprinted material for preparing two phenol oxidation silicon modified by sol-gel method. The the imprinted polymer structure and morphology of the materials were characterized, and the kinetics of the adsorption of phenol, isothermal adsorption and specific adsorption properties were determined. The experimental results show that the surface of multi walled carbon nanotubes synthesized by benzene The imprinted layer was prepared by phenol, phenol imprinted material. The imprinted material of the template molecule apparent maximum binding capacity of 19.90 mg/g, only one binding site, imprinted factor reached 3.48, the selectivity is 3.44, the polymer can reach dynamic adsorption equilibrium at 120 min. This proves that the imprinted material has imprinted sites and a lot of good adsorption ability. (3) have been prepared into solid phase extraction column of phenol imprinted materials prepared, for phenol in cosmetics for separation and enrichment, combined with high performance liquid chromatography. The experimental results show that the solid phase extraction column can enrichment and separation of phenol in cosmetics as well.

【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：O631.3

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