Padmavathy, N and Behera, SS and Pathan, S and Das Ghosh, L and Bose, S (2019) Interlocked graphene oxide provides narrow channels for effective water desalination through forward osmosis. In: ACS Applied Materials and Interfaces, 11 (7). pp. 7566-7575.
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Abstract
Unique two-dimensional water channels formed by stacked graphene oxide (GO) sheets that are "nonleachable" and nonswellable can show great potential for water remediation. The interlayer spacing controls the solute or ion sieving and plays a crucial role in water transport in GO-based membranes. Herein, the sub-nano-channels adjacent to the sheets are altered by either ionic or covalent cross-linking using magnesium hydroxide (Mg(OH) 2 ) and graphene oxide quantum dots (GQDs) (named GOM and G-GQD), respectively. In aqueous solution, these cross-linkers prevent the GO sheets from swelling and precisely control the interlayer spacing required for water permeation. In addition, these narrowed GO sheets facilitate significant improvement in salt rejection of a divalent ion by forward osmosis and selective dye rejection and are resistive toward biofouling and bacterial growth. The cross-linked GO membranes are robust enough to withstand strong cross-flow velocity and aided in unimpeded water transport through the nanochannels. Among the membranes, the G-GQD membranes (G-GQD) show better antifouling characteristics, dye separation performance over 95-97 for various dyes, divalent ion rejection by 97, and no cytotoxicity against HaCaT cells as compared with other GO membranes. Our findings on interlocking the domains of nanoslits of the GO structure by small ecofriendly molecules portray these materials as potential candidates for water separation applications. © 2019 American Chemical Society.
| Item Type: | Journal Article |
|---|---|
| Publication: | ACS Applied Materials and Interfaces |
| Publisher: | American Chemical Society |
| Additional Information: | The copyright for this article belongs to American Chemical Society |
| Keywords: | Desalination; Flow velocity; Graphene oxide; Ions; Magnesium compounds; Magnesium printing plates; Membranes; Nanocrystals; Osmosis; Semiconductor quantum dots; Swelling; Water filtration; Water treatment, Antifouling characteristics; Covalent crosslinking; Crossflow velocities; Forward osmosis; Interlayer spacings; Magnesium hydroxide; Separation performance; Two-dimensional water channels, Graphene, graphene oxide; graphite; quantum dot, artificial membrane; cell line; chemistry; human; materials testing; osmosis; porosity; procedures; water management, Cell Line; Graphite; Humans; Materials Testing; Membranes, Artificial; Osmosis; Porosity; Quantum Dots; Water Purification |
| Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
| Date Deposited: | 13 Dec 2022 04:53 |
| Last Modified: | 13 Dec 2022 04:53 |
| URI: | https://eprints.iisc.ac.in/id/eprint/78326 |
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