介孔二氧化硅納米顆粒的制備、改性及其應用研究
[Abstract]:In recent years, mesoporous silica nanomaterials (MSNs) have attracted extensive attention due to their potential applications in catalysis, adsorption separation and drug loading. A large number of studies have shown that mesoporous silica has its own complex framework structure, internal pore structure and external morphology. In addition, many functional groups have been grafted onto mesoporous silicon to expand their applications. This is because functionalized mesoporous silicon can achieve a good combination of organic functionality with large specific surface area and high stability of inorganic materials. In this paper, we propose some new ideas to synthesize mesoporous dioxide. The main research contents are as follows: 1. Using tetraethyl orthosilicate (TEOS) as silicon source and Cetyltrimethylammonium Bromide (CTAB) as surfactant, eight kinds of small molecular organic amines (small molecular organic amines) were used. A series of small size monodisperse silica particles were synthesized by using SOAs, tetrahydroethyl ethylenediamine, tetrahydropropyl ethylenediamine, tetraethyl ethylenediamine and hydroxyethyl hexahydrotriazine, and nitrogen heterocyclic compounds (NCHCs; 1,8-dimethylnaphthalene, imidazole, piperazine and pyridylpiperazine) as catalysts. The dispersion, antifogging and antifogging properties of mesoporous materials synthesized by the catalysts and the effect of changing THEEDA/TEOS on the structure and morphology of the materials were investigated. The experimental results show that we have successfully synthesized a series of small size monodisperse silica nanoparticles for the first time by using these catalysts, and by selecting non-disperse particles. The same SOAs and NCHCs can also effectively adjust the particle size, pore size and specific surface area of monodisperse mesoporous silicon particles. Meanwhile, for mesoporous materials synthesized with THEEDA as catalyst, by changing the molar ratio of THEEDA / TEOS, the particle size, pore size and specific surface area can be well controlled, and the material can be greatly improved. In addition, the results also show that the mesoporous materials synthesized by THEEDA have good dispersibility, stability and antifogging effect. 2. The sulfhydryl functionalization of mesoporous silica nanoparticles prepared by THEEDA as catalyst. Sulfhydryl modified mesoporous silicon particles showed good adsorption properties when treated with Au3+ and Hg2+ heavy metal ions. The samples were further characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), dynamic light scattering spectroscopy (DLS), N2 adsorption desorption and X-ray diffraction (XRD). The results showed that: 1. These particles retain the original spherical structure, with uniform particle size (about 30-40 nm), large specific surface area (about 500 m2/g) pore volume (16 cm3 g-1) and narrow pore size distribution (3 nm). The functionalized nanoparticles have good adsorption properties for heavy metal ions Au3+ and Hg2 +, and have potential for the detection and recovery of heavy metal ions Au3 +. Application Value. 3. In alkaline condition of cationic surfactant CTAB as template, organic functional groups were successfully grafted onto the surface of silica particles by copolycondensation of TEOS and organic alkoxysilane with hydrophobic alkane chain ((RSi (OR') 3, R = C3H7, C8H17, C12H25). The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, N2 adsorption and desorption. The experimental results show that these spherical functionalized mesoporous silica particles have ordered 2D hexagonal structure, large specific surface area (1000 m2g), large pore volume (1.2 cm 3g-1), narrow pore size distribution (2.7 nm) and narrow pore size distribution (2.7 nm). Moreover, the size and pore structure of mesoporous silica particles can be effectively adjusted by increasing the amount of DTES and lengthening the alkyl chain length of organosilane. Finally, the glass sheet coating prepared by dipping and pulling method with DTES-50 granular sol (0.05g/25 ml ethanol) shows good superhydrophilicity/superhydrophilicity. Anti fog performance.
【學位授予單位】:河南大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TQ127.2
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