Dutta, Sarbasree and Das, Nandini (2022) Graphene-Coated Halloysite Nanoclay Membrane for the Enhanced Separation of Hydrogen from a Hydrogen-Helium Mixture. ACS Applied Materials & Interfaces, 14 (28). pp. 32444-32456. ISSN 1944-8244

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This study highlights the separation of hydrogen from H-2-He mixture gas by a graphene-coated halloysite nanoclay membrane. The graphene-coated clay membrane along with its pure day counterpart is successfully developed and studied for gas separation using hydrogen (H-2)-helium (He) single and mixture gases. Hydrothermal and nonhydrothermal methods were applied for the synthesis of a ``coated'' membrane on a porous alumina substrate from the graphene and halloysite clay. To date, nanoporous zeolites are the potential materials for gas separation based on a molecular sieving mechanism. A similar separation mechanism for hydrogen and helium from mixture gases may not work efficaciously due to the closeness of their kinetic diameter (H-2: 2.89 angstrom and He: 2.6 angstrom). The presence of defects and torn nanopores between graphene layers along with the different surface charges of the inner and outer layer of halloysite nanotubes facilitates the ``coated'' membrane to show an appreciable H-2/He separation factor of similar to 4 using H-2-He (1:1) mixture gas compared to 2.86 for the pure halloysite membrane. The available charge layer of graphene also has a significant contribution for this increased H-2/He selectivity value. The permeate flux of H-2 and He through both the graphene-coated clay membrane and pure clay membrane has also been noted. The permeate flux of pure H-2 and He was 2 x 10(-7) and 1.3 x 10(-7) mol m(-2) s(-1) Pa-1 for the clay membrane, whereas for the ``coated'' clay membrane, the values changed to 0.1 x 10(-7) and similar to 0.05 x 10(-7) mol m(-2) s(-1) Pa-1 at 100 kPa, respectively.

Item Type: Article
Subjects: Engineering Materials
Divisions: Ceramic Membrane
Depositing User: Bidhan Chaudhuri
Date Deposited: 29 Aug 2023 10:25
Last Modified: 29 Aug 2023 10:25
URI: http://cgcri.csircentral.net/id/eprint/5445

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