本文選題：多孔材料 + 硅酸鎂　； 參考：《內(nèi)蒙古大學(xué)》2015年碩士論文

【摘要】：硅酸鹽材料因具有穩(wěn)定性強(qiáng),自然環(huán)保等優(yōu)良特性而廣泛的應(yīng)用于吸附領(lǐng)域。特別是硅酸鎂納米材料可以作為一種高效的吸附劑用于對(duì)重金屬離子、放射性同位素和有機(jī)污染物的吸附。作為吸附劑,高的比表面積和多孔結(jié)構(gòu)可以提供更多的附著點(diǎn)和較大的吸附容量,是促進(jìn)吸附劑和污染物之間相互作用的兩個(gè)關(guān)鍵因素。因此,制備新型空心結(jié)構(gòu)的硅酸鎂材料成為當(dāng)前科研領(lǐng)域的熱點(diǎn)之一。與硅酸鎂納米空心球相比,介孔硅酸鎂具有更好的水熱穩(wěn)定性,更短的運(yùn)輸路徑,從而更適合作為吸附劑。然而,介孔硅酸鎂材料的制備還很少被報(bào)道過(guò)。本論文中,以碳填充的SBA-15介孔氧化硅(C@SBA-15)為硬模板(母體模板)和硅源反應(yīng),通過(guò)犧牲輔助模板-水熱法制備晶化介孔硅酸鎂。在水熱反應(yīng)過(guò)程中,C@SBA-15孔道中的碳起到支撐孔壁的作用,由SiO：構(gòu)成的母體模板孔壁與鎂離子反應(yīng)生成硅酸鎂,成為新的外孔壁。最后通過(guò)高溫煅燒去除起到支撐孔壁作用碳,生成品化介孔硅酸鎂。利用PANalytical Empyrean X射線衍射儀通過(guò)Cu靶Kα輻射測(cè)試了晶化介孔硅酸鎂晶體結(jié)構(gòu)和介觀結(jié)構(gòu)。利用Hitachi S-4800型描電子顯微鏡和FEI TecnaiF20型透射電子顯微鏡分別表征了晶化介孔硅酸鎂的形態(tài)、表面形貌與微觀結(jié)構(gòu)。利用ASAP 2020比表面積分析儀對(duì)材料進(jìn)行N2吸-脫附等溫測(cè)試。結(jié)果表明,本實(shí)驗(yàn)中通過(guò)水熱合成法所制備的晶化介孔硅酸鎂具有二維六方孔道結(jié)構(gòu),較大的比表面積和較好的水熱穩(wěn)定性。這些特征可以很好的提高吸附性能。以Pb2+和亞甲基藍(lán)為研究對(duì)象,測(cè)試了新型晶化介孔硅酸鎂材料的吸附性能。所合成的晶化介孔硅酸鎂具有很好的吸附性能,可以廣泛的用于污水中重金屬離子的治理。上述研究表明,利用C@SBA-15和鎂鹽為原料合成新型介孔硅酸鎂擁有較大的比表面積和再生特性,可以重復(fù)利用,對(duì)水體中污染物有很好的吸附特性。這一新的合成思路不僅為制備新型介孔硅酸鹽材料提供了更多的可能性,而且可以更好的提高硅酸鎂作為吸附劑的吸附效率。
[Abstract]:Silicate materials are widely used in adsorption field because of their excellent properties such as high stability and environmental protection.In particular, magnesium silicate nanomaterials can be used as an efficient adsorbent for the adsorption of heavy metal ions, radioactive isotopes and organic pollutants.As adsorbent, high specific surface area and porous structure can provide more attachment points and larger adsorption capacity, which are the two key factors to promote the interaction between adsorbent and pollutants.Therefore, the preparation of new hollow magnesium silicate materials has become one of the hot research fields.Compared with magnesium silicate nanospheres, the mesoporous magnesium silicate has better hydrothermal stability and shorter transport path, so it is more suitable as an adsorbent.However, the preparation of mesoporous magnesium silicate is rarely reported.In this thesis, crystalline mesoporous magnesium silicate was prepared by sacrificial auxiliary template-hydrothermal method using carbon-filled SBA-15 mesoporous silicon oxide (SBA-15 SBA-15) as hard template (matrix template) and silicon source reaction.During the hydrothermal reaction, the carbon in the channel of C @ SBA-15 acts as a support for the pore wall. The pore wall of the Sio: template reacts with the magnesium ion to form magnesium silicate, which becomes a new external pore wall.Finally, high temperature calcination is used to remove the supporting pore wall carbon, and the finished product is mesoporous magnesium silicate.The crystal structure and mesoscopic structure of crystalline mesoporous magnesium silicate were measured by PANalytical Empyrean X-ray diffractometer with K 偽 radiation from Cu target.The morphology, surface morphology and microstructure of crystalline mesoporous magnesium silicate were characterized by Hitachi S-4800 electron microscope and FEI TecnaiF20 transmission electron microscope, respectively.The N2 absorption-desorption isotherm was measured by ASAP 2020 surface area analyzer.The results show that the crystalline mesoporous magnesium silicate prepared by hydrothermal synthesis has two dimensional hexagonal pore structure, larger specific surface area and better hydrothermal stability.These characteristics can improve the adsorption performance.The adsorption properties of new crystalline mesoporous magnesium silicate materials were studied by Pb2 and methylene blue.The synthesized mesoporous magnesium silicate has good adsorption properties and can be widely used in the treatment of heavy metal ions in sewage.The results show that the new mesoporous magnesium silicate synthesized by using C@SBA-15 and magnesium salt as raw materials has large specific surface area and regeneration characteristics and can be reused and has good adsorption characteristics for pollutants in water.This new synthesis method not only provides more possibilities for the preparation of new mesoporous silicate materials, but also improves the adsorption efficiency of magnesium silicate as adsorbent.
【學(xué)位授予單位】：內(nèi)蒙古大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ132.2;TB383.4

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本文編號(hào)：1755282