The respiration and transpiration of postharvest fruits elevate the relative humidity within the packaging microenvironment, fostering the proliferation of microorganisms. Consequently, developing packaging materials characterized by high water adsorption stability is imperative for maintaining the quality of food. In this study, a bimetallic organic framework with exceptional water adsorption stability (i.e., Fe-MOF-801), was synthesized employing a transition metal (Fe) doping strategy and subsequently fabricated into packaging (FeMGCF). Grand Canonical Monte Carlo simulations demonstrated that as the H2O loading increased, H2O migrated from the T1 and T2 cavities to the T3 cavity (which possesses a weaker H2O binding capability) of MOF-801. However, H2O was primarily adsorbed in the T1 and T2 cavities of Fe-MOF-801. Density functional theory indicated that, in comparison to MOF-801, electron accumulation occurred at the O site in Fe-MOF-801, resulting in an increased interaction force of O-H (in H2O), dynamic water vapor and thermogravimetric analysis revealed that the binding energy of Fe-MOF-801 and H2O was increased 29.6%. As a validation experiment, Fe-MOF-801 prolonged the shelf life of tomatoes by 6 days and delayed the degradation of lycopene and anthocyanin by modulating the humidity in the packaging microenvironment. In conclusion, this work developed a material that improves the postharvest water-binding capacity, which is anticipated to offer a novel approach for modulating the humidity of the packaging microenvironment and preserving the nutritional quality of postharvest fruits.
Abstract In catalytic reactions, trace amounts of promoters can make up for the low activity of a catalyst and significantly affect the physicochemical properties of the catalyst. Exploring a simple and efficient composite Cu‐based catalyst is essential to the Rochow‐Müller reaction. In this work, monodisperse, a hydrangea‐like 0.3Zn‐0.15Sn/CuO composite catalyst in the Rochow‐Müller reaction. The composite was synthesized via a microwave‐assisted liquid‐phase synergistic impregnation method in which Sn and Zn were used to dope the CuO surface to create strong Si interaction points. A significant increase in the catalytic activity of CuO was observed after Sn and Zn doping, attributed to the rearrangement of charges on the CuO surface and increase in the Cu atom's core electron density. This work provided a novel and efficient method for preparing efficient Cu‐based catalysts for the Rochow‐Müller reaction.
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