氨基硅烷修饰介孔二氧化硅@石墨烯三明治结构复合材料用于低浓度CO2吸附的研究
Study on the Adsorption of Low Concentration CO2 by Modified Mesoporous Silica @ Graphene Sandwich-Like Structure Composites with Aminosilane
DOI: 10.12677/HJCET.2018.85033, PDF,    科研立项经费支持
作者: 刘 莉, 杨本群, 邹国军, 雒 旭, 许 珊*：中国科学院兰州化学物理研究所羰基合成与选择性氧化国家重点实验室，甘肃 兰州
关键词: 3-氨基丙基三甲氧基硅烷；介孔二氧化硅@石墨烯；CO2吸附；3-Aminopropyl Trimethoxysilane； Mesoporous Silica @ Graphene； CO2 Adsorption
摘要: 3-氨基丙基三甲氧基硅烷(APES)修饰溶胶–凝胶法制备的介孔二氧化硅@石墨烯(mSiO2@GNs)三明治结构复合材料。采用N2气吸–脱附等温线、透射电镜(TEM)、X射线光电子能谱(XPS)、傅里叶变换红外光谱(FT-IR)、热重分析(TGA)以及差示扫描量热法(DSC)对制备的样品进行了结构和物理性质的表征。本文研究了APES接枝量、吸附温度、水分对吸附剂低浓度CO2吸附性能的影响以及吸附剂的再生性能。实验结果表明：一个大气压力下，30%APES-mSiO2@GNs在0℃时最大的CO2吸附量为69.5 mg•g−1，CO2/N2的吸附选择性高达97.8%。在25℃的吸附温度下，水分存在时，CO2的吸附量增加了19.6%。在干燥条件下经过20次吸–脱附循环后，30%APES-mSiO2@GNs的CO2吸附能力仍保持在86.6%，具有较好的循环稳定性。
Abstract: Mesoporous silica @ graphene (mSiO2@GNs) sandwich-like structure composites prepared by sol-gel method and modified with 3-aminopropyl trimethoxysilane (APES). The structural and physical properties of the samples were characterized by N2 gas absorption-desorption isotherms, Transmission electro microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), Thermogravimetric analysis (TGA) and Differential scanning calorimetry (DSC). In this paper, the effects of APES grafting amount, adsorption temperature and moisture on the adsorption properties of adsorbent for low concentration CO2 and the regeneration performance of adsorbents were studied. The experimental results show that the maximum adsorption capacity of CO2 at 0˚C for 30% APES-mSiO2@GNs under one atmospheric pressure is 69.5 mg•g−1, and the adsorption selectivity of CO2/N2 is as high as 97.8%. The adsorption capacity of CO2 increased by 19.6% in the presence of water at the adsorption temperature of 25˚C. The CO2 adsorption ability of 30% APES-mSiO2@GNs remains at 86.6% after 20 adsorption-desorption cy-cles under dry conditions, showing that it has good cyclic stability.

文章引用：刘莉, 杨本群, 邹国军, 雒旭, 许珊. 氨基硅烷修饰介孔二氧化硅@石墨烯三明治结构复合材料用于低浓度CO2吸附的研究[J]. 化学工程与技术, 2018, 8(5): 265-275. https://doi.org/10.12677/HJCET.2018.85033

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