Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (8): 1274-1284.DOI: 10.19894/j.issn.1000-0518.210493

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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
  • Supported by:
    the National Natural Science Foundation of China(51673191)


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

CLC Number: