本文關(guān)鍵詞： 溶膠凝膠法 介孔材料 納米顆粒 比表面積 孔容孔徑　出處：《廣西師范大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：介孔材料MCM-48型分子篩由于自身?xiàng)l件的優(yōu)越性,在催化、吸附分離、醫(yī)藥等方面都具有非常有潛力的應(yīng)用前景,可以用作吸附劑、催化劑和主體材料來(lái)合成新型的碳纖維、電子遷移光敏劑、非線性光學(xué)材料、半導(dǎo)體材料以及量子團(tuán)簇等。因其具有較大的孔徑,可以從污水中較好地吸附Ag、Hg、Pb、Cd等離子半徑較大且不容易被微孔分子篩吸附的重金屬離子。在含有較高硫酸根離子的情況下,可以去除濃度較低的鉻酸根與砷酸根,還可以吸附污水中的有機(jī)污染物苯、甲苯及具有揮發(fā)性的一些有機(jī)化合物。同時(shí),由于磁性納米材料具有超順磁性、高的飽和磁強(qiáng)度、高的矯頑力、制備工藝簡(jiǎn)單及耐腐蝕、耐磨損等一系列的優(yōu)點(diǎn),但是顆粒易團(tuán)聚一直以來(lái)是鐵氧體制備的最大難題,這就導(dǎo)致磁性納米材料在應(yīng)用上受到很大程度的限制。鑒于目前存在的問(wèn)題,制備核殼式的磁性復(fù)合材料Y@MCM-48,以鐵氧體為核MCM-48為殼來(lái)實(shí)現(xiàn)兩種材料的性能互補(bǔ),解決自身存在的問(wèn)題,本文的主要工作內(nèi)容如下:通過(guò)溶膠凝膠法制備介孔材料MCM-48,分別改變制備過(guò)程中模板劑的種類,表面活性劑與硅源的摩爾比,水浴攪拌溫度觀察復(fù)合材料的形貌與性能變化,表征結(jié)果顯示,所得到的介孔材料MCM-48微觀結(jié)構(gòu)為尺寸較為均一的球形形貌,表面積為 1030.07～1252.48m2/g,孔容為 0.77-1.31cm3/g,孔徑為 2.01-3.56nm,粒徑直徑分布在300～500nm之間。首先用溶膠凝膠法制備出CoFe2O4磁性顆粒,然后利用溶膠凝膠法在磁性顆粒CoFe204表面包裹一層有序介孔二氧化硅,形成以磁性納米顆粒為核的磁性復(fù)合材料CoFe2O4@MCM-48,分別改變制備過(guò)程中鈷鐵尖晶石的添加量,表面活性劑與硅源的摩爾比,乙二醇(F108)的用量觀察復(fù)合材料的形貌與性能變化,表征結(jié)果顯示,所得到的CoFe2O4@MCM-48復(fù)合材料的微觀結(jié)構(gòu)為尺寸均一的球形形貌,表面積為982.86-1078.46m2/g,孔孔容為0.69～1.30cm3/g,孔徑為1.86～2.52nm,粒徑直徑分布在350～500nm之間。
[Abstract]:Mesoporous MCM-48 molecular sieves have potential applications in catalysis, adsorption and separation, medicine and so on because of their own advantages. They can be used as adsorbents, catalysts and host materials to synthesize new carbon fibers. Electron transfer Guang Min, nonlinear optical materials, semiconductor materials and quantum clusters, etc., due to their large pore size, The heavy metal ions with large plasma radius and not easily adsorbed by microporous molecular sieve can be adsorbed from the wastewater. The chromate and arsenate with lower concentration can be removed under the condition of higher sulfate ion. It can also adsorb benzene, toluene and some volatile organic compounds in wastewater. At the same time, due to its superparamagnetism, high saturation magnetic intensity, high coercivity, simple preparation process and corrosion resistance, Wear resistance and other advantages, but the agglomeration of particles has always been the biggest problem in the preparation of ferrite, which leads to the application of magnetic nanomaterials is greatly limited. The core-shell magnetic composite Y@ MCM-48 was prepared. The ferrite was used as the core MCM-48 shell to realize the complementary performance of the two materials and to solve the existing problems. The main work of this paper is as follows: the mesoporous material MCM-48 was prepared by sol-gel method. The types of template, the molar ratio of surfactant to silicon source, and the temperature of water bath agitation were used to observe the morphology and properties of the composite. The results showed that the MCM-48 microstructure of the mesoporous material was spherical with a uniform size, with a surface area of 1030.07 and 1252.48m2 / g, pore volume of 0.77-1.31 cm ~ (-3) / g, pore size of 2.01-3.56 nm and diameter distribution of 300 ~ 500nm. Firstly, the magnetic particles of CoFe2O4 were prepared by sol-gel method. Then the magnetic particle CoFe204 surface was coated with ordered mesoporous silica by sol-gel method, and the magnetic composite CoFe2O4 / MCM-48 with magnetic nanoparticles as the core was formed. The amount of cobalt-ferrite spinel was changed respectively during the preparation process. The morphologies and properties of the composites were observed by the molar ratio of surfactant to silicon, and the amount of ethylene glycol F108). The characterization results showed that the microstructure of the CoFe2O4@MCM-48 composites was spherical with uniform size. The surface area is 982.86-1078.46 m2 / g, the pore volume is 0.69 ~ 1.30 cm ~ (-3) / g, the pore diameter is 1.86 ~ 2.52 nm, and the diameter distribution is between 350 ~ 500 nm.
【學(xué)位授予單位】：廣西師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB33;O647.3

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