Iron-based metal–organic frameworks and their polymer composites for sustainable delivery of herbicides

Bhomick, PC, Ivanovska, EH, Mahmoud, LAM, Doan, HV, Terry, LR, Addicoat, MA ORCID: https://orcid.org/0000-0002-5406-7927, Rowlandson, JL, Rochat, S, Ting, VP and Nayak, S, 2025. Iron-based metal–organic frameworks and their polymer composites for sustainable delivery of herbicides. ACS Omega. ISSN 2470-1343

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Abstract

Sustainable agriculture will play a key role to ensure food security for the rising global population. Controlled and precision delivery of agrochemicals such as herbicides and pesticides play a critical role towards sustainable agriculture. Recently, porous metal-organic frameworks (MOFs) have shown promising results for controlled agrochemical delivery. Because of their low toxicity and biocompatibility iron-based metal-organic frameworks (Fe-MOFs) are highly suitable for applications in agriculture over many other MOFs. In this study, two iron-based MOFs, MIL-101(Fe) and NH2-MIL-101(Fe), and their biodegradable polymer composites were studied for controlled herbicide delivery. Two herbicides, 2,4-dichlorophenoxyacetic acid (2,4-D) and 2-methyl-4-chlorophenoxyacetic acid (MCPA), were post synthetically loaded into these two Fe-MOFs and incorporated into biodegradable polycaprolactone (PCL) matrix to form composite membranes for ease of handling and delivery. MIL-101(Fe) showed loading capacities of 18.06 wt% and 21.51 wt%, respectively for 2,4-D and MCPA, while for NH2-MIL-101(Fe) the loading capacities for the same herbicides were 26.61 wt% and 23.32 wt%. De-spite high loading capacity, both MOFs showed certain degree of degradation during the herbicide loading. The release of 2,4-D and MCPA from MIL-101(Fe) and NH2-MIL-101(Fe) and their PCL composites were studied using UV-visible spec-troscopy over a nine-day period. NH2-MIL-101(Fe) and its PCL composite demonstrated slower and more controlled re-lease profiles of the herbicides than MIL-101(Fe) and its composites. The results were also corroborated by computational studies which showed stronger interaction of the herbicides with NH2-MIL-101(Fe).

Item Type:	Journal article
Publication Title:	ACS Omega
Creators:	Bhomick, P.C., Ivanovska, E.H., Mahmoud, L.A.M., Doan, H.V., Terry, L.R., Addicoat, M.A., Rowlandson, J.L., Rochat, S., Ting, V.P. and Nayak, S.
Publisher:	American Chemical Society (ACS)
Date:	26 February 2025
ISSN:	2470-1343
Identifiers:	Number Type 10.1021/acsomega.4c07972 DOI 2390389 Other
Divisions:	Schools > School of Science and Technology
Record created by:	Laura Borcherds
Date Added:	03 Mar 2025 09:52
Last Modified:	03 Mar 2025 09:52
URI:	https://irep.ntu.ac.uk/id/eprint/53156

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