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

doi:10.19894/j.issn.1000-0518.210493

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.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)

1. Coadsorption Kinetics of Amino-Functionalized Graphene Oxide and Fatty Acids at the Water/Oil Interface.pdf(278KB)

Abstract

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

CLC Number:

O647.1

Yue-Hua ZHAO, Da-Peng WANG. Coadsorption Kinetics of Amino‑Functionalized Graphene Oxide and Fatty Acids at the Water/Oil Interface[J]. Chinese Journal of Applied Chemistry, 2022, 39(8): 1274-1284.

Figures/Tables 11

Fig.1 Fabrication of NH2-PEG-GO

Fig.2 （A） FT-IR spectra，（B） particle size distribution and （C） zeta potential of GO and NH2-PEG-GO

Fig.3 Dynamic interfacial tension of the octane/water interface with time for single systems of sole PA and NH2-PEG-GO：（a1） 0.05 mg/mL PA，（a2） 5 mg/mL PA，（b1） 0.1 mg/mL NH2-PEG-GO，（b2） 5 mg/mL NH2-PEG-GO and binary systems of （c1） 0.05 mg/mL PA and 0.1 mg/mL NH2-PEG-GO

Table 1 Basic parameters of PA and NH2?PEG?GO

序号

No.

组成

Compound

流体力学半径

R_h/nm

界面吸附面积

A/nm²

本体扩散系数

D/（m²·s^-1）

Fig.4 （A） Dynamic interfacial tension data plotted against t-1/2，（B） Effective diffusion coefficient and adsorption barrier of different mass concentration NH2-PEG-GO

Fig.5 Dynamic interfacial tension data plotted against t-1/2 of different mass concentration PA

Fig.6 Interfacial tension between octane/water decays as a function of the mass concentration of PA：（A） 0 mg/mL，（B） 0.5 mg/mL

Fig.7 Interfacial tension between octane/water decays as a function of the mass concentration of PA：（A） 0 mg/mL，（B） 0.1 mg/mL

Fig.8 Ratio ПBM/ПΣ of different mass concentration of PA and NH2-PEG-GO

Fig.9 Time evolution of interfacial tension between 0.1 mg/mL NH2-PEG-GO solutions and octane solutions at different fatty acids mass concentrations of （A） C10，（B） C16，（C） C20，（D） The curves of the equilibrium IFT vs. the mass concentration of fatty acids with different linear alkyl groups， NH2-PEG-GO at fixed 0.1 mg/mL

Table 2 Basic parameters of fatty acids

序号

No.

组成

Composition

数均相对分子质量

M_n

流体力学半径

R_h/nm

本体扩散系数

D/（m²·s^-1）

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

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