氨基化氧化石墨烯和脂肪酸在水-油界面的共吸附动力学  

Coadsorption Kinetics of Amino-Functionalized Graphene Oxide and Fatty Acids at the Water/Oil Interface

作　　者：赵跃华 王大鹏[1,2] ZHAO Yue-Hua;WANG Da-Peng(State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院长春应用化学研究所,高分子物理与化学国家重点实验室,长春130022 [2]中国科学技术大学,合肥230026

出　　处：《应用化学》2022年第8期1274-1284,共11页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(No.51673191)资助。

摘　　要：合成了氨基化氧化石墨烯(NH_(2)-PEG-GO),利用界面张力仪研究了脂肪酸质量浓度、NH_(2)-PEG-GO质量浓度以及脂肪酸链长度对于NH_(2)-PEG-GO与脂肪酸在水-油界面共吸附行为的影响。结果表明,当NH_(2)-PEG-GO与脂肪酸共同存在于液相且质量浓度较低时,此时的水-油界面张力值要明显低于体系中只添加NH_(2)-PEG-GO或脂肪酸时的张力值。脂肪酸的链长越长,NH_(2)-PEG-GO与脂肪酸共吸附降低界面张力能力越强。由于相对于NH_(2)-PEG-GO,脂肪酸尺寸较小,所以初期的界面张力降低由脂肪酸吸附引起,而且,脂肪酸在水-油界面的吸附能够吸引NH_(2)-PEG-GO向界面扩散,表现出吸附的协同效应。而在吸附后期,界面张力降低现象由NH_(2)-PEG-GO主导,NH_(2)-PEG-GO与脂肪酸之间存在竞争吸附。In this work,we synthesize amino-functionalized graphene oxide(NH_(2)-PEG-GO).The effects of fatty acid,NH_(2)-PEG-GO mass concentration,and chain length of fatty acids on the coadsorption behavior of NH_(2)-PEG-GO and fatty acids at the water-oil interface are studied via pendant drop tensiometry.The water-oil interfacial tension for low mass concentration NH_(2)-PEG-GO and fatty acids coexisting in the liquid phase is significantly lower than one of them added.The longer the chain length of fatty acids,the stronger the ability of coadsorption for NH_(2)-PEG-GO and fatty acids to reduce interfacial tension.Due to the smaller size of fatty acids than NH_(2)-PEG-GO,the decrease of interfacial tension in the initial stage is mainly caused by fatty acids.The adsorption of fatty acids accumulates the adsorption rate of NH_(2)-PEG-GO,there is a synergistic effect between NH_(2)-PEG-GO and fatty acids.While in the later stage of adsorption,the decrease of the interfacial tension is dominated by NH_(2)-PEG-GO,there is competitive adsorption between NH_(2)-PEG-GO and fatty acids.

关 键 词：氨基化氧化石墨烯 脂肪酸 界面张力 共吸附动力学 驱油 

分 类 号：O647.1[理学—物理化学]