Qi Ying, Yang Huaming, Li Chunli, Li Hao
National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China.
Molecules. 2024 Feb 23;29(5):981. doi: 10.3390/molecules29050981.
Trace ethylene poses a significant challenge during the storage and transportation of agricultural products, causing over-ripening, reducing shelf life, and leading to food waste. Zeolite-supported silver adsorbents show promise for efficiently removing trace ethylene. Herein, hierarchical Ag/NZ5(X) adsorbents were prepared via different ammonia modifications, which featured enhanced ethylene adsorption ability. Ag/NZ5(2.5) exhibited the largest capacity and achieved near-complete removal at room temperature with prolonged efficacy. Characterization results indicated that the ammonia modification led to the formation of a hierarchical structure in the zeolite framework, reducing diffusion resistance and increasing the accessibility of the active sites. Additionally, desilication effects increased the defectiveness, generating a stronger metal-support interaction and resulting in a higher metal dispersion rate. These findings provide valuable insights into the development of efficient adsorbents for removing trace ethylene, thereby reducing food waste and extending the shelf life of agricultural products.
痕量乙烯在农产品的储存和运输过程中构成了重大挑战，会导致过度成熟、缩短保质期并造成食物浪费。沸石负载银吸附剂在有效去除痕量乙烯方面显示出前景。在此，通过不同的氨改性制备了分级Ag/NZ5(X)吸附剂，其具有增强的乙烯吸附能力。Ag/NZ5(2.5)表现出最大的容量，在室温下实现了近乎完全的去除且效果持久。表征结果表明，氨改性导致沸石骨架中形成分级结构，降低了扩散阻力并增加了活性位点的可及性。此外，脱硅效应增加了缺陷度，产生了更强的金属-载体相互作用并导致更高的金属分散率。这些发现为开发用于去除痕量乙烯的高效吸附剂提供了有价值的见解，从而减少食物浪费并延长农产品的保质期。
