改性处理对埃洛石纳米管结构和脱硫性能的影响

发布时间：2018-06-03 02:10

本文选题：埃洛石纳米管 + 有机嫁接改性　；参考：《天津大学》2015年硕士论文

【摘要】：2006年,美国Natural Nano公司率先报道了埃洛石纳米管在橡胶领域表现出优良性能,从而引发了对该类材料研究的热潮。进一步研究表明该类纳米管材料不仅在橡胶领域表现出优良性能,而且还在吸附、存储、输运、催化、复合材料、气体分离等方面展现出优良的特色。另外,众多研究显示该类纳米管在很大程度上与碳纳米管具有一定的相似性,而该类纳米管相对于碳纳米管有较高的存储量,从而成为可替代碳纳米管的最具潜力的纳米材料。有机改性是提升孔道类材料性能的有效方法。研究表明经过有机改性的埃洛石纳米管在吸附水中重金属离子及其他污染物方面表现出优良性能,但是,对于有机改性对埃洛石纳米管孔结构的影响及吸附脱硫性能研究较少。因此,本文首先选择苯基磷酸与酚醛树脂作为改性剂,通过直接键合和包覆的方法获得改性的埃洛石纳米管,考察了不同基团对纳米管孔结构和脱硫性能的影响;其次,通过后嫁接合成法获得表面氨基化与羧基化的改性埃洛石纳米管,考察不同表面基团对埃洛石纳米管表面酸性的影响及其吸附脱硫性能;最后,通过后嫁接合成法利用3-氨丙基三乙氧基作为改性剂获得系列氨基埃洛石纳米管,考察了嫁接方式、氨基浓度、氨基层数对埃洛石纳米管孔结构的影响及其吸附脱硫性能。研究显示,改性剂的选择对埃洛石纳米管的改性至关重要,不合适的改性剂破坏了改性载体管状结构或堵塞管内腔,内孔减少,使孔隙率降低,不利于吸附脱硫。不同嫁接表面基团对埃洛石纳米管的表面酸性位具有一定的影响,埃洛石纳米管表面中强酸酸性位有利于吸附脱硫。氨基的嫁接方式、浓度、层数对埃洛石纳米管孔结构和脱硫性能具有一定的影响。经过有机嫁接改性,埃洛石纳米管管外表面与管内腔形成空间网状结构,增大了埃洛石纳米管的孔容,有利于吸附脱硫。
[Abstract]:In 2006, Natural Nano Company of the United States first reported the excellent properties of Ellowstone nanotubes in the rubber field, which led to the upsurge in the research of this kind of materials. Further studies show that this kind of nanotube materials not only exhibit excellent properties in rubber field, but also exhibit excellent characteristics in adsorption, storage, transport, catalysis, composite materials, gas separation and so on. In addition, many studies show that this kind of nanotubes are similar to carbon nanotubes to a great extent, and they have higher storage capacity than carbon nanotubes, so they become the most potential materials to replace carbon nanotubes. Organic modification is an effective method to improve the properties of porous materials. The results show that the organically modified Elosite nanotubes exhibit excellent properties in the adsorption of heavy metal ions and other pollutants in water, but there are few studies on the effect of organic modification on the pore structure and adsorption desulfurization performance of Elosite nanotubes. Therefore, Phenylphosphoric acid and phenolic resin were selected as modifiers to obtain the modified Elosterite nanotubes by direct bonding and coating, and the effects of different groups on the pore structure and desulfurization properties of the nanotubes were investigated. The surface amination and carboxylation of modified Elosite nanotubes were obtained by post-grafting synthesis. The effects of different surface groups on the surface acidity and their adsorption and desulfurization properties were investigated. A series of aminoethoxy nanotubes were prepared by post-grafting synthesis using 3-aminopropyl triethoxy as modifier. The effects of grafting mode, amino concentration and number of amino layers on pore structure and adsorption desulfurization performance were investigated. The results show that the selection of modifier is very important to the modification of Ellosite nanotubes, and the improper modifier destroys the tubular structure of the modified carrier or blocks the inner cavity of the tube, reduces the internal pores, reduces the porosity, and is not conducive to adsorption and desulphurization. Different grafted surface groups have a certain effect on the surface acidity of Elosite nanotubes, and the strong acid acidic sites on the surface of Ellosite nanotubes are favorable to the adsorption and desulphurization. The grafting mode, concentration and number of layers of amino groups have a certain effect on the pore structure and desulfurization performance of Ellosite nanotubes. After the organic grafting modification, the outer surface of the Elosterite nanotubes and the inner cavity of the tubes formed a space network structure, which increased the pore volume of the Elosite nanotubes and was conducive to the adsorption and desulfurization of the tubes.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE624.55;TB383.1

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