高岭石—丝氨酸插层复合物的形成与制备研究

发布时间：2018-06-20 04:23

本文选题：高岭石-丝氨酸 + 形成　；参考：《浙江大学》2015年硕士论文

【摘要】：高岭石是一种常见的1：l层状硅酸盐材料,其插层复合物在医药、电化学、高分子纳米聚合物、催化以及美容护肤领域具有巨大的应用前景,但是只有极少数的有机小分子能够直接插层高岭石,大部分的其他分子都要合适的前驱体经过液相置换法进入,以环境友好型的(1001=0.84 nm水合高岭石为预插层体,制备时间短且工艺简单。本文在查阅大量的国内外文献基础上,综述了高岭石插层复合物及其应用的研究现状,尤其是在医药方面和美容护肤方面的应用,并与插层分子丝氨酸的医药功能和美容护肤功能结合。本文主要分别以高岭石-乙二醇插层复合物和d001=1.0 nm水合高岭石为插层前驱体,制备了高岭石-丝氨酸插层复合物并对其形成过程和机理进行了研究,具体如下：通过液相置换法成功地制备了高岭石-丝氨酸插层复合物,并通过扫描电镜、X射线衍射、傅里叶红外光谱对其进行了表征。结果表明,丝氨酸能够通过置换客体分子乙二醇或水插入高岭石层间,不能直接插层高岭石。经过丝氨酸分子的插层,高岭石的厚度从原先的30 nm减小至大约14 nm,层间距从0.72nm扩大至1.13 nm,丝氨酸以单层分子在高岭石层间分布,并形成尽可能多的氢键,高岭石羟基基团与丝氨酸的COO-,高岭石Si-O层与丝氨酸的NH3+分别形成氢键,并且丝氨酸的-OH基团很有可能嵌入高岭石Si-O层的(SiO)6六方孔洞,与高岭石的内羟基作用。插层前驱体中的乙二醇分子和水分子分别将高岭石原石的层间距扩大1.08 nm和1.0 nm,便于丝氨酸分子的插层,客体分子在高温下很容易脱嵌,在被丝氨酸分子取代之前脱嵌的激活能Ea控制了高岭石-丝氨酸的含量,乙二醇的Ea为6.95 kJ/mol,水分子的Ea为21.2 kJ/mol,分别基于α=0.9-8.6exp(-6.95/T)和α=0.4-564.2exp(-21.2/T)。所以后者的插层率为85%,是前者45%的1.8倍。另外,高岭石-环丝氨酸插层复合物通过与丝氨酸一样的方法成功形成,并表现出极为相似的性质,所以高岭石-丝氨酸在医药方面和美容护肤方面具有很大的应用潜力。
[Abstract]:Kaolinite is a kind of common 1: l layered silicate material. Its intercalation compound has great application prospect in medicine, electrochemistry, polymer nano-polymer, catalysis and beauty care. But only a very small number of organic molecules can intercalate kaolinite directly, and most of the other molecules need suitable precursors to enter through the liquid phase displacement process, with the environmentally friendly kaolinite hydrated at 0.84 nm as the pre-intercalation. The preparation time is short and the process is simple. Based on a large number of literatures at home and abroad, this paper reviews the research status of kaolinite intercalation composites and their applications, especially in medicine and beauty care. It is combined with the medical function of intercalated molecular serine and the function of beauty and skin care. In this paper, the kaolinite-serine intercalation complex was prepared by using kaolinite ethylene glycol intercalation complex and d001 1. 0 nm hydrated kaolinite as intercalation precursor. The formation process and mechanism of kaolinite serine intercalation complex were studied. The main results are as follows: the kaolinite-serine intercalation complex was successfully prepared by liquid phase replacement method and characterized by scanning electron microscopy (SEM) X-ray diffraction and Fourier transform infrared spectroscopy (FTIR). The results showed that serine could not intercalate kaolinite directly by replacing guest molecule ethylene glycol or water into the interlayer of kaolinite. Through the intercalation of serine molecules, the thickness of kaolinite is reduced from 30 nm to about 14 nm, and the interlayer spacing is extended from 0.72nm to 1.13 nm. Serine distributes as monolayer between kaolinite layers and forms as many hydrogen bonds as possible. The hydroxyl groups of kaolinite and serine, kaolinite Si-O layer and serine NH _ 3 respectively form hydrogen bonds, and the -OH group of serine is likely to be embedded in the Si-O layer of kaolinite's Si-O layer and intercalated with the hexagonal pore of kaolinite, which acts with the inner hydroxyl of kaolinite. Ethylene glycol and water molecules in the intercalation precursor expand the interlayer spacing of kaolinite by 1.08 nm and 1.0 nm, respectively, so as to facilitate the intercalation of serine molecules. The activation energy (EA) of kaolinite and serine was controlled by the activation energy EA before being replaced by serine molecule. The EA of ethylene glycol was 6.95 kJ / mol, and the EA of water molecule was 21.2 kJ / mol, based on 伪 -0.9-8.6exp-6.95 / T) and 伪 -0.4-564.2exp-21.2 / T ~ (-1 / T), respectively. So the intercalation rate of the latter is 85%, 1.8 times that of the former 45%. In addition, kaolinite-cyclic serine intercalation complex was successfully formed by the same method as serine, and showed very similar properties, so kaolinite-serine has great application potential in medicine and beauty care.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33

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