Study on Adsorption Properties and Mechanism of Graphene Oxide (GO) by Kaolin

Abstract

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.

Exploring the Influence of Chemical Conditions on Nanoparticle Graphene Oxide Adsorption onto Clay Minerals

“…However, the mechanical and thermodynamic properties of GO on kaolinite and bentonite were not included in this study, although they are being developed. Furthermore, the majority of studies used at least seven values of compatibility [ 16 , 81 ]. However, due to the lack of capabilities, our study was limited to only four values of compatibility, which is likely to affect the accuracy of our models.…”

“…It can also be applied in wastewater treatment by means of adsorption. Kaolinite, a 1:1 clay mineral, is also a common clay mineral in subsurface areas and is used as a good adsorption medium in previous studies [ 15 , 16 ]. For example, it was used as an alternative adsorbent by [ 17 , 18 ] to remove minerals and dyes from wastewater due to its low cost and high adsorption performance.…”