An entrapped metal-organic framework system for controlled release of ethylene

Journal of Colloid and Interface Science
Yongguang GuanYaguang Luo

Abstract

A novel gas storage and release system was developed for ethylene, an exogenous plant hormone that regulates fruit ripening and senescence. This system consists of a metal organic framework (MOF) core and an alginate-based shell. The MOF comprises a coordination complex of Al and [btc]3- ligands, which formed hexagonal structure (P63/mmc) with unit cell of 14.28 × 14.28 × 31.32 Å3, as revealed by the X-ray diffraction analysis. Ethylene absorption isotherm exhibited an absorption capacity of 41.0 cm3/g MOF at 25 °C and 101.3 kPa. After charging with ethylene, the MOFs are further entrapped in a close-knit bead formed with alginate-Fe(III) matrix, observed under a scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDS). The alginate shell is degraded by exposing to 200 mM sodium citrate aqueous solution, triggering a continuous release of ethylene. With 20 mg of MOF, ethylene concentration reached 0.41-0.46 mg/L per mg MOF after 2.5 h. This is the first report regarding a controlled release of ethylene through degrading alginate-Fe(III) matrix rather than by changing the interfacial pore size of MOF under extreme conditions. This technology can enable precisely controlled and targeted applications of e...Continue Reading

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Citations

Aug 31, 2019·ACS Applied Materials & Interfaces·Marzena FandzlochElisa Barea
Dec 17, 2021·Comprehensive Reviews in Food Science and Food Safety·Amr ZaitoonLoong-Tak Lim

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