Nano-Micro Letters

Nano/Micro-Confined Water in Graphene Hydrogel as Superadsorbents for Water Purification

Yiran Sun1, Fei Yu2, *, Cong Li3, Xiaohu Dai1, 5, Jie Ma1, 4, 5, *

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Nano-Micro Lett. (2020) 12: 2

First Online: 12 December 2019 (Article)


*Corresponding author. E-mail: (Jie Ma); (Fei Yu)





Confined water has been proven to be of great importance due to its pervasiveness and contribution to life and many fields of scientific research. However, the control and characterization of confined water is a challenge. Herein, a confined space is constructed by flexibly changing the pH of a graphene oxide (GO) dispersion under the self-assembly process of a graphene hydrogel (GH), and the confined space is adjusted with variation from 10.04 to 3.52 nm. Confined water content in GH increases when the pore diameter of the confined space decreases, the corresponding adsorption capacity increases from 243.04 to 442.91 mg g-1. Moreover, attenuated total reflectance Fourier transform infrared spectroscopy and Raman spectroscopy are utilized to analyze the hydrogen bonding structure qualitatively and quantitatively, correlation analysis reveals that the improvement in the adsorption capacity is caused by incomplete hydrogen bonding in the confined water. Further, confined water is assembled into four typical porous commercial adsorbents, and a remarkable enhancement of the adsorption capacity is achieved. This research demonstrates the application potential for the extraordinary properties of confined water and has implications for the development of highly effective confined-water modified adsorbents.



Confined water; Graphene hydrogel; Hydrogen bonding; Adsorption; Antibiotic

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