Faculty of Food Technology, University of Economics-Technology for Industries (UNETI), Hanoi, 11622, Viet Nam.
Institute for Tropical Technology, Vietnam Academy of Science and Technology, Hanoi, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam.
Chemosphere. 2023 Jul;329:138607. doi: 10.1016/j.chemosphere.2023.138607. Epub 2023 Apr 8.
Photocatalysts based on titanium dioxide (TiO) were widely applied to solve environmental problems such as water and air pollution treatment. Currently, the application of these compounds for food packaging is increasing. This study prepared silver (Ag) doped TiO photocatalyst (Ag/TiO) for the decomposition of gas ethylene (Eth), which is the main factor that causes fruits to over-ripen and damage or decay. It found that the doping of Ag could improve the optical property and light adsorption ability of Ag/TiO photocatalyst, which directly enhanced the photocatalytic decomposition of Eth performance. Under visible light, Ag/TiO could depredate 91.2% of Eth, while the removal performance by using the original TiO was 43.9%. The increased initial concentration of Eth from 5 to 30 ppm could inhibit the photocatalytic efficiency of Ag/TiO from 98.6 to 69.2%. Besides, the relative humidity and gas flow rate are roles in the Eth decomposition process. The recycling experiment confirmed that Ag/TiO had good reusability with a slight loss in photocatalytic performance (18.6%) after ten cycles tested. The future protective application of Ag/TiO for food protection during storage and transportation is discussed. This work provides a potential method to remove gas ethylene, reduce the ripening process and extend the shelf life of fruits.
基于二氧化钛（TiO）的光催化剂被广泛应用于解决水污染和空气污染等环境问题。目前，这些化合物在食品包装中的应用也在增加。本研究制备了银（Ag）掺杂的 TiO 光催化剂（Ag/TiO），用于分解气体乙烯（Eth），这是导致水果过度成熟、损坏或腐烂的主要因素。研究发现，Ag 的掺杂可以提高 Ag/TiO 光催化剂的光学性能和光吸收能力，从而直接增强光催化分解 Eth 的性能。在可见光下，Ag/TiO 可以降解 91.2%的 Eth，而使用原始 TiO 的去除性能仅为 43.9%。Eth 的初始浓度从 5ppm 增加到 30ppm 会抑制 Ag/TiO 的光催化效率，从 98.6%降低到 69.2%。此外，相对湿度和气体流速也是 Eth 分解过程中的作用因素。回收实验证实，Ag/TiO 在经过十次循环测试后，具有良好的可重复使用性，光催化性能仅略有损失（18.6%）。本研究探讨了 Ag/TiO 在食品储存和运输过程中的保护应用前景。这项工作为去除气体乙烯、减缓成熟过程和延长水果保质期提供了一种潜在的方法。
