Study on Adsorption Properties and Mechanism of Graphene Oxide (GO) by Kaolin
2022
Xingjiang Song, Lin Zhou, Haibo Kang, Na Li, Wei Wang and Ping Jiang
Kaolin was used as an adsorbent to remove toxic graphene oxide (GO) from an aqueous solution. The adsorption properties and mechanism of GO by Kaolin were systematically studied by various characterization techniques and methods. The effects of pH, amount of absorbent, and initial concentration of GO on the adsorption of GO by Kaolin were studied in detail. The results show that the interaction between GO and Kaolin is realized by the O-C=O bond, and the adsorption of GO by Kaolin is a chemical adsorption process. Under the optimized conditions (pH=3, T=303 K, equilibrium time = 6 h, C0 = 60 mg·L-1), the removal rate of GO reached 97.1% (Kaolin=70 mg), and the adsorption capacity reached 45.3 mg·g-1 (Kaolin=50 mg). According to the experimental results, Kaolin may be a promising material, which can effectively eliminate GO from an aqueous solution. The results of this study provide key information about the migration and potential fate of GO in the natural environment.
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