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Electropositive nanodiamond-coated quartz microfiber membranes for virus and dye filtration

Bland, Henry A., Centeleghe, Isabella A., Mandal, Soumen ORCID:, Thomas, Evan L. H., Maillard, Jean-Yves ORCID: and Williams, Oliver A. ORCID: 2021. Electropositive nanodiamond-coated quartz microfiber membranes for virus and dye filtration. ACS Applied Nano Materials 4 (3) , pp. 3252-3261. 10.1021/acsanm.1c00439

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Electropositive membranes demonstrating high flux at low pressure differentials show great promise as universal separation platforms for viruses and other charged entities when centralized systems of water and power are scarce. However, the fabrication of a suitably stable membrane with optimal electrostatic characteristics remains a challenge. Here, hydrogenated detonation nanodiamond was loaded onto a quartz microfiber support membrane and coupled to the membrane surface under a high vacuum annealing process. The fabricated membranes display a zeta potential of +45 mV at pH 7 and an isoelectric point around pH 11. We show that the nanodiamond coating is robust to prolonged periods of pressurized water flow by performing extensive zeta potential measurements over time, and water filtration tests demonstrated excellent membrane retention for the electronegative dye molecule acid black 2, and at least a 6.2 log10 reduction in MS2 bacteriophage from feed waters (>99.9999%).

Item Type: Article
Date Type: Publication
Status: Published
Schools: Pharmacy
Physics and Astronomy
Publisher: ACS
ISSN: 2574-0970
Funders: EPSRC
Date of First Compliant Deposit: 12 March 2021
Date of Acceptance: 23 February 2021
Last Modified: 06 Jan 2024 04:23

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