应用化学 ›› 2022, Vol. 39 ›› Issue (8): 1274-1284.DOI: 10.19894/j.issn.1000-0518.210493

• 研究论文 • 上一篇    下一篇

氨基化氧化石墨烯和脂肪酸在水-油界面的共吸附动力学

赵跃华1,2, 王大鹏1,2()   

  1. 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
  • 收稿日期:2021-10-03 接受日期:2021-11-15 出版日期:2022-08-01 发布日期:2022-08-04
  • 通讯作者: 王大鹏
  • 基金资助:
    国家自然科学基金(51673191)

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

Yue-Hua ZHAO1,2, Da-Peng WANG1,2()   

  1. 1.State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    2.University of Science and Technology of China,Hefei 230026,China
  • Received:2021-10-03 Accepted:2021-11-15 Published:2022-08-01 Online:2022-08-04
  • Contact: Da-Peng WANG
  • About author:wdp@ciac.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(51673191)

摘要:

合成了氨基化氧化石墨烯(NH2-PEG-GO),利用界面张力仪研究了脂肪酸质量浓度、NH2-PEG-GO质量浓度以及脂肪酸链长度对于NH2-PEG-GO与脂肪酸在水-油界面共吸附行为的影响。结果表明,当NH2-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NH2-PEG-GO或脂肪酸时的张力值。脂肪酸的链长越长,NH2-PEG-GO与脂肪酸共吸附降低界面张力能力越强。由于相对于NH2-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NH2-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NH2-PEG-GO主导,NH2-PEG-GO与脂肪酸之间存在竞争吸附。

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

Abstract:

In this work, we synthesize amino-functionalized graphene oxide (NH2-PEG-GO). The effects of fatty acid, NH2-PEG-GO mass concentration, and chain length of fatty acids on the coadsorption behavior of NH2-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 NH2-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 NH2-PEG-GO and fatty acids to reduce interfacial tension. Due to the smaller size of fatty acids than NH2-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 NH2-PEG-GO, there is a synergistic effect between NH2-PEG-GO and fatty acids. While in the later stage of adsorption, the decrease of the interfacial tension is dominated by NH2-PEG-GO, there is competitive adsorption between NH2-PEG-GO and fatty acids.

Key words: Amino-functionalized graphene oxide, Fatty acids, Interfacial tension, Coadsorption kinetics, Oil recovery

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