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Cellulose Acetate Microbeads for Controlled Delivery of Essential Micronutrients
Ciarán Callaghan1,2, Davide Califano1, Marcos Henrique Feresin Gomes3
1Centre for Sustainable & Circular Technologies, University of Bath, Bath BA27AY, U.K.
ACS Sustainable Chemistry & Engineering
|April 3, 2023
Summary
Biodegradable zinc-impregnated cellulose acetate beads offer a sustainable alternative for controlled-release fertilizers. This innovation reduces reliance on plastic carriers, mitigating environmental risks and carbon emissions in agriculture.
Area of Science:
- Materials Science
- Agricultural Science
- Environmental Science
Background:
- Controlled micronutrient delivery is vital for crop yield.
- Current methods use plastic carriers, causing environmental harm and carbon emissions.
- Developing eco-friendly fertilizer delivery systems is crucial.
Purpose of the Study:
- To present a novel method for preparing biodegradable zinc-impregnated cellulose acetate beads.
- To evaluate these beads as controlled-release fertilizers.
- To offer a sustainable alternative to plastic-based fertilizer carriers.
Main Methods:
- Cellulose acetate solutions in DMSO were combined with zinc salts.
- Phase inversion in aqueous antisolvents formed zinc-impregnated beads.
- Zinc uptake and release profiles were analyzed in water and soil.
Main Results:
- Biodegradable beads containing zinc were successfully synthesized.
- Zinc uptake reached up to 15.5% with optimized methods.
- Controlled release in soil extended up to 130 days for zinc sulfate beads.
- Release profiles correlated with counter-ion properties (Hofmeister series).
Conclusions:
- Zinc-impregnated cellulose acetate beads are an efficient, biodegradable alternative.
- This method reduces plastic use and associated environmental impacts in agriculture.
- The beads demonstrate potential for sustainable, long-term micronutrient delivery.
