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    Zirconium-based MOFs and their biodegradable polymer composites for controlled and sustainable delivery of herbicides

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    Nayak_et_al_ACS_Applied_Bio_Materials (12.97Mb)
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    Publication date
    2022-07-29
    Author
    Mahmoud, L.A.M.
    Telford, Richard
    Livesey, T.C.
    Katsikogianni, Maria G.
    Kelly, Adrian L.
    Terry, L.R.
    Ting, V.P.
    Nayak, Sanjit
    Keyword
    MOF
    Composite
    Zirconium
    MCPA
    Agriculture
    Pesticide
    Rights
    © 2022 The Authors. Published by American Chemical Society. This work is licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/
    Peer-Reviewed
    Yes
    Open Access status
    openAccess
    
    Metadata
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    Abstract
    Adsorption and controlled release of agrochemicals has been studied widely using different nanomaterials and a variety of formulations. However, the potential for application of high surface-area metal-organic frameworks (MOFs) for the controlled release of agrochemicals has not been thoroughly explored. Herein, we report controlled and sustainable release of a widely used herbicide (2-methyl-4-chlorophenoxyacetic acid, MCPA) via incorporation in a range of zirconium-based MOFs and their biodegradable polymer composites. Three Zr-based MOFs, viz., UiO-66, UiO-66-NH2, and UiO-67 were loaded with MCPA either postsynthetically or in situ during synthesis of the MOFs. The MCPA-loaded MOFs were then incorporated into a biodegradable polycaprolactone (PCL) composite membrane. All three MOFs and their PCL composites were thoroughly characterized using FT-IR, TGA, SEM, PXRD, BET, and mass spectrometry. Release of MCPA from each of these MOFs and their PCL composites was then studied in both distilled water and in ethanol for up to 72 h using HPLC. The best performance for MCPA release was observed for the postsynthetically loaded MOFs, with PS-MCPA@UiO-66-NH2 showing the highest MCPA concentrations in ethanol and water of 0.056 and 0.037 mg/mL, respectively. Enhanced release of MCPA was observed in distilled water when the MOFs were incorporated in PCL. The concentrations of herbicides in the release studies provide us with a range of inhibitory concentrations that can be utilized depending on the crop, making this class of composite materials a promising new route for future agricultural applications.
    URI
    http://hdl.handle.net/10454/19105
    Version
    Published version
    Citation
    Mahmoud LAM, Telford R, Livesey TC et al (2022) Zirconium-based MOFs and their biodegradable polymer composites for controlled and sustainable delivery of herbicides. ACS Applied Bio Materials. 5(8): 3972-3981.
    Link to publisher’s version
    https://pubs.acs.org/doi/10.1021/acsabm.2c00499
    Type
    Article
    Collections
    Life Sciences Publications

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