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Lookup NU author(s): Warm In-Na, Professor Jonathan LeeORCiD, Dr Gary Caldwell
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
Over 110 million tonnes of textile fibres and apparel are produced annually, ultimately ending with significant quantities of waste textiles. One route for upcycling end-of-life textiles is to repurpose the materials for atmosmospheric carbon dioxide (CO2) removal by integrating microalgae (single celled photosynthetic organisms) to form ‘living’ biocomposites. In this study we demonstrate the CO2 capture performance of prototype living algae biocomposites that use textiles as a solid substrate. Chlorella vulgaris was attached to 100% cotton and 100% polyester sheets, of which half were coated with kappa-carrageenan (a natural polymer derived from seaweed) as a gel topcoat to enhance microalgae retention. The biocomposites were investigated in 28 days semi-batch CO2 absorption tests using a 5% v/v CO2/air gas mixture. They absorbed significantly more CO2 than suspension microalgae culture controls, with the highest CO2 absorption rate being 1.82 ± 0.10 g CO2 g-1biomass d-1 from the coated cotton biocomposites, followed by 1.55 ± 0.27 g CO2 g-1biomass d-1 from the uncoated cotton biocomposites. The coated and uncoated polyester biocomposites had comparatively lower CO2 absorption rates (0.49 ± 0.04 and 0.42 ± 0.03 g CO2 g-1biomass d-1respectively), likely due to the surface charges of the materials affecting microalgae adhesion and retention. A two weeks attachment test on cotton/polyester blends revealed some deterioration of the cotton which could limit the longevity of the biocomposites. Despite these issues, the CO2 abatement values compare favourably with other Chlorella CO2 capture studies with the added benefit of much reduced water usage and a reduced land requirement.
Author(s): In-Na P, Lee JGM, Caldwell GS
Publication type: Article
Publication status: Published
Journal: Journal of Industrial Textiles
Year: 2022
Volume: 51
Issue: 4_suppl
Pages: 5683S-5707S
Print publication date: 01/06/2022
Online publication date: 02/07/2021
Acceptance date: 24/05/2021
Date deposited: 25/05/2021
ISSN (print): 1528-0837
ISSN (electronic): 1530-8057
Publisher: Sage Publications Ltd
URL: https://doi.org/10.1177/15280837211025725
DOI: 10.1177/15280837211025725
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