Issue

Vol. 12 (2020)

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

https://doi.org/10.1007/s40820-019-0336-3
Yiran Sun
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, People’s Republic of China
Fei Yu
College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, People’s Republic of China
Cong Li
Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, OH 44325, USA
Xiaohu Dai
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, People’s Republic of China
Jie Ma
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, People’s Republic of China

Corresponding Author: Jie Ma

jma@tongji.edu.cn

Nano-Micro Letters, Vol. 12 (2020), Article Number: 2

Abstract

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 are a challenge. Herein, a confined space is constructed by flexibly changing the pH of a graphene oxide 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, and 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.


Highlights
1 Confined space/water in graphene hydrogel was constructed and controlled.
2 Adsorption capacity of porous adsorbents was enhanced by filling confined water.
3 Incomplete hydrogen bonding in confined water contributes to adsorption.

Keywords

Confined water Graphene hydrogel Hydrogen bonding Adsorption Antibiotic
Sun, Yiran, Fei Yu, Cong Li, Xiaohu Dai, and Jie Ma. 2019. “Nano-/Micro-Confined Water in Graphene Hydrogel As Superadsorbents for Water Purification”. Nano-Micro Letters 12 (December):2. https://doi.org/10.1007/s40820-019-0336-3.
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