本文選題：SBA-15 + MCFs��； 參考：《長春理工大學(xué)》2017年碩士論文

【摘要】：本研究利用水熱合成法制備出SBA-15和MCFs分子篩,通過化學(xué)分析,低溫氮氣吸附-解吸附等溫線,粉末X-射線衍射(XRD),透射電鏡(TEM),掃描電鏡(SEM)和傅里葉變換紅外光譜(FT-IR)對SBA-15和MCFs的表面、孔隙結(jié)構(gòu)等進(jìn)行表征。用合成的SBA-15和MCFs對亞甲基藍(lán)、酸性紅G染料溶液進(jìn)行吸附,通過實驗得出SBA-15和MCFs吸附亞甲基藍(lán)和酸性紅G的最佳吸附條件以及最大吸附量,SBA-15對亞甲基藍(lán)的最大吸附量為223 mg/g,SBA-15對酸性紅G的最大吸附量是3.532 mg/g,MCFs對亞甲基藍(lán)的最大吸附量是215.5 mg/g,MCFs對酸性紅G的最大吸附量是3.053mg/g。SBA-15和MCFs吸附亞甲基藍(lán)和酸性紅G的動力學(xué)符合準(zhǔn)二階動力學(xué)方程。通過Langmuir和Freundlich吸附等溫線模型對結(jié)果進(jìn)行分析,SBA-15和MCFs吸附亞甲基藍(lán)和吸附酸性紅G的吸附體系符合Freundlich吸附等溫線模型。吸附過程中的吉布斯自由能變化00ΔG,可以判斷吸附過程是自發(fā)進(jìn)行的。吸附過程中的焓變小于零,說明吸附過程是放熱反應(yīng),熵變的負(fù)值表明吸附過程是熵減少的過程。對吸附后的復(fù)合材料通過化學(xué)分析、粉末XRD、SEM、TEM、FT-IR、低溫N2吸附-解吸附等一系列方法進(jìn)行了表征,表征結(jié)果表明吸附后的復(fù)合材料仍然保留原介孔材料的骨架結(jié)構(gòu),但復(fù)合材料有序度降低。吸附后,復(fù)合材料的平均孔徑、總孔容和比表面積均比吸附前介孔材料的要降低,表明吸附后介孔材料孔道被部分填充、堵塞,這說明染料分子包合在了介孔孔道中。對比吸附前后介孔體積的變化可以算出介孔材料SBA-15每個孔平均吸附6.67×10~(20)個亞甲基藍(lán)分子,介孔材料MCFs每個孔平均吸附2.56×10~(21)個亞甲基藍(lán)分子。
[Abstract]:SBA-15 and MCFs molecular sieves were prepared by hydrothermal synthesis. The isotherms of adsorption and desorption of low temperature nitrogen were obtained by chemical analysis. The surface and pore structures of SBA-15 and MCFs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Methylene blue and acid red G dye solution were adsorbed by synthetic SBA-15 and MCFs. The optimum adsorption conditions of SBA-15 and MCFs for methylene blue and acid red G and the maximum adsorption capacity of SBA-15 for methylene blue are obtained. The maximum adsorption capacity of SBA-15 for acid red G is 3.532 mg / g MCFs for methylene blue. The maximum adsorption capacity of acid red G is 3.053 mg / g SBA-15 and 3.053 mg / g SBA-15, respectively. The kinetics of adsorption of methylene blue and acid red G by MCFs accords with the quasi-second-order kinetic equation. The results were analyzed by Langmuir and Freundlich adsorption isotherms. The adsorption systems of SBA-15 and MCFs for methylene blue and acid red G were fitted to Freundlich adsorption isotherm model. The Gibbs free energy of the adsorption process varies by 00 螖 G, which can be judged to be spontaneous. The enthalpy of the adsorption process is smaller than zero, which indicates that the adsorption process is an exothermic reaction, and the negative value of entropy change indicates that the adsorption process is a process of entropy reduction. The adsorbed composites were characterized by a series of methods, such as chemical analysis, powder XRDX SEMMOTEMT-IR, low temperature N2 adsorption and desorption. The results showed that the adsorbed composites still retained the skeleton structure of the original mesoporous materials. However, the order degree of the composites decreased. After adsorption, the average pore size, total pore volume and specific surface area of the composites were lower than those of the mesoporous materials before adsorption, indicating that the mesoporous materials were partially filled and blocked after adsorption, which indicated that the dye molecules were encapsulated in the mesoporous channels. By comparing the changes of mesoporous volume before and after adsorption, it can be calculated that the mesoporous material SBA-15 adsorbs an average of 6.67 脳 10 ~ (-1) methylene blue molecules per pore, and MCFs an average of 2.56 脳 10 ~ (10) (21) methylene blue molecules per pore.
【學(xué)位授予單位】：長春理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X703;TQ424.25

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