Synthesis and Utilisation of Hybrid Metal-Carbonic Anhydrase Enzyme Carrier System for Soil Biocementation

Journal article

Mwandira, W., Purchase, D., Mavroulidou, M. and Gunn, J. M. (2023). Synthesis and Utilisation of Hybrid Metal-Carbonic Anhydrase Enzyme Carrier System for Soil Biocementation. Applied Sciences. 13 (17), p. 9494. https://doi.org/10.3390/app13179494
AuthorsMwandira, W., Purchase, D., Mavroulidou, M. and Gunn, J. M.
Abstract

Biocementation is an emerging nature-inspired method of producing eco-friendly cement for soil stabilization. This paper used the bovine-derived carbonic anhydrase (CA) enzyme to catalyse the bioprecipitation of CaCO3 in a fine-grained soil and thus to biocement the soil. To increase the efficiency of the CA, an innovative copper–carbonic anhydrase (CA) hybrid was fabricated. This study is a proof-of-concept of the potential application of these enzyme carriers for soil bioce-mentation. The hybrid carriers are aimed to enhance the stability, recovery and reusability of the enzyme used in the biocementation process. The results showed that the fabricated copper phosphate-based inorganic hybrid was stable throughout the duration of the tests (2 months) and under a wide range of pH and temperatures. Its enzymatic activity was enhanced compared to the free CA enzyme and it was proved suitable for soil biocementation. This was further confirmed by the SEM analysis. Additionally, the treated soil with the formulated hybrid carrier showed im-proved unconfined compressive strength, especially when the carriers were implemented into the soil by mixing. The material analysis by Raman spectroscopy confirmed calcium carbonate as the primary precipitate, consistent with soil biocementation. Overall, this innovative method of de-livery of enzymes with enhanced stability and activity shows promise that, upon further devel-opment, it can be successfully used to increase the efficiency and sustainability of the biocemen-tation process.

Keywordscarbonic anhydrase; enzyme carriers; ground improvement; biocementation; CO2 capture
Year2023
JournalApplied Sciences
Journal citation13 (17), p. 9494
PublisherMDPI
ISSN2076-3417
Digital Object Identifier (DOI)https://doi.org/10.3390/app13179494
Web address (URL)https://www.mdpi.com/2076-3417/13/17/9494
Publication dates
Online22 Aug 2023
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Accepted19 Aug 2023
Deposited29 Aug 2023
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