化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (9) : 155-160.

科学研究

石墨烯/SiO₂复合气凝胶微球的制备及其吸附性能研究

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Preparation of GS-CAMs and its adsorption property

Wu Ming, Gao Yue, Wang Wangcheng, Sun Hongmei, Peng Xiao, Wu Yan

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文章历史 +

Received
2018-04-26
Issue Date	Revised Date
2019-10-10	2018-04-26

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摘要

以硅溶胶为原料,通过W/O乳液法结合溶胶-凝胶过程制备SiO₂气凝胶微球。在硅溶胶中掺杂氧化石墨烯(GO),经过洗涤、溶剂替换、表面改性、真空干燥制备出掺杂量不同的氧化石墨烯/SiO₂复合气凝胶微球(GOS-CAMs),最后经高温处理得到石墨烯/SiO₂复合气凝胶微球(GS-CAMs)。经过堆密度、氮气吸附-脱附、扫描电子显微镜及傅里叶变换红外光谱等测试,选择GO掺杂量为0.4%(wt,质量分数,下同)的GS-CAMs,分别与石墨烯、SiO₂气凝胶微球进行对比,研究其在不同温度下对水溶液中不同浓度甲苯的吸附性能,并从吸附热力学、吸附动力学探讨其吸附机理。结果表明:掺杂量为0.4%的GO制备的GS-CAMs的综合性能最好,其松散堆密度为300kg/m³,比表面积、平均孔径分别为328m²/g、31.23nm;与纯SiO₂气凝胶微球相比,GS-CAMs的比表面积、孔径明显增加;GS-CAMs对不同温度下不同浓度甲苯水溶液的最大饱和吸附量为211mg/g,约为SiO₂气凝胶微球、石墨烯吸附量的1.2倍、1.6倍。吸附过程符合Langmuir等温吸附模型和准二级动力学模型。

Abstract

Industrial silica sol used as the raw materials,silica aerogel microspheres were prepared by W/O emulsion method,and combing with the sol-gel process.Graphene/silica composite aerogel microspheres (GS-CAMs) were synthesized by adding graphene oxide to the silica sol,combined with washing,solvent replacement,surface modification,vacuum drying,and then high temperature treatment.Through the consider of the bulk density,N₂ adsorption-desorption,scanning electron microscopy (SEM),infrared spectroscopy (FT-IR),etc.The adsorption performance on toluene and phenol in aqueous solution at different temperatures of GS-CAMs with GO doping of 0.4% was compared with graphene and SiO₂ aerogel microspheres respectively,the adsorption mechanism was discussed from the adsorption thermodynamics and adsorption kinetics.The properties of the microspheres prepared by the doping amount of 0.4% were the best.The bulk density of 0.4% GS-CAMs was 300kg/m³,the specific surface area and average pore diameter were 328m²/g,31.23nm respectively.Compared to the specific surface area and pore size of the pure SiO₂ aerogel microspheres,it is increased significantly.The maximum saturation adsorption capacity of the 0.4% GS-CAMs for different concentration of toluene and phenol in aqueous solution were 211mg/g,which was about 1.2 times of the SiO₂ aerogel microspheres,and about 1.6 times of the adsorption capacity of G,respectively.The adsorption process was in accordance with the pseudo-second order and the Langmuir isotherm model.

关键词

石墨烯 / 微球 / 气凝胶 / 甲苯水溶液 / 吸附

Key words

graphene / microsphere / aerogel / toluene solution / adsorption

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石墨烯/SiO₂复合气凝胶微球的制备及其吸附性能研究[J]. 化工新型材料, 2019, 47(9): 155-160 DOI:

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