Partially Reduced Graphene Oxide and Chitosan Nanohybrid Membranes for Selective Retention Of divalent Cations

Overview

Journal RSC Adv

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2022 May 11

PMID 35539355

Authors

Yangyang Wei

Jian Wang

Hao Li

Man Zhao

Huifeng Zhang

Yipeng Guan

Hai Huang

Baoxia Mi

Yushan Zhang

Affiliations

Soon will be listed here.

Abstract

A tremendous quantity of brackish water with a high proportion of divalent cations is in great need of water softening. Layer-stacked graphene oxide membranes show potential in membrane processing due to their molecular sieving properties, but show poor selective retention of cations due to unstable interlayer spacing and electrostatic interaction. In this study, a partially reduced graphene oxide (prGO) and chitosan (CS) nanohybrid membrane (prGO-CS) was fabricated to achieve the selective retention of divalent cations by adjusting the configuration and controlling the surface charge. The prGO-CS membrane, which included a CS skin and embedded prGO sheets, showed a performance boost of 98.0% rejection of Mg and 95.5% rejection of Ca when compared with a CS membrane. The membrane showed good water softening performance for brackish water under low operation pressure with a high Na/Mg selectivity of 33.8. The excellent performance was attributed to the dense structure and positive charge of prGO-CS.

Citing Articles

Preparation and characterization of chitosan membranes.

Cui L, Gao S, Song X, Huang L, Dong H, Liu J RSC Adv. 2022; 8(50):28433-28439.

PMID: 35542487 PMC: 9084291. DOI: 10.1039/c8ra05526b.

Reduced Graphene Oxide-Based Double Network Polymeric Hydrogels for Pressure and Temperature Sensing.

Liu W, Zhang X, Wei G, Su Z Sensors (Basel). 2018; 18(9).

PMID: 30235851 PMC: 6165443. DOI: 10.3390/s18093162.

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