噻吩−冠醚基共价有机聚合物的制备及钯离子吸附性能研究

The Preparation and Palladium Adsorption Properties of Thiophene-crown Ether-based Covalent Organic Polymers

贵金属钯(Pd)由于独特的物理和化学性质,在催化、新能源、医疗、环境保护等领域中发挥着关键作用。钯矿的全球储量稀少且不可再生,因此钯的分离回收对实现可持续发展和资源的循环利用具有重要意义。通过席夫碱反应制备两种由三噻吩基团和冠醚基团作为骨架的共价有机聚合物(COPs):B-18C6-COP和B-24C8-COP,并通过静态吸附法评价两种材料对钯离子的吸附性能。研究结果显示,B-18C6-COP和B-24C8-COP在酸性条件下表现出较好的稳定性,在1 mol/L HNO_(3)浓度下,对钯离子的吸附容量分别为109.41、96.26 mg/g。同时,在与其他10种竞争离子共存时,两种材料均显示出对钯离子的高选择性。此项工作提供了一类对钯离子具有优异选择性的吸附剂,为钯离子的回收利用提供了新的思路。

The unique physical and chemical properties of the precious metal palladium(Pd)enable it to play a key role in fields such as catalysis,new energy sources,medicine and environmental protection.Global reserves of palladium ore are scarce and non-renewable,so the separation and recovery of palladium is of great significance to the realization of sustainable development and the recycling of resources.Two covalent organic polymers(COPs):B-18C6-COP and B-24C8-COP,with trithiophene groups and crown ether groups as backbones,were prepared by the Schiff base reaction,and the adsorption properties of the two materials for palladium ions were evaluated by the static adsorption method.The results showed that B-18C6-COP and B-24C8-COP exhibited better stability under acidic conditions,and the adsorption capacities for palladium ions were 109.41 mg/g and 96.26 mg/g at 1 mol/L HNO_(3),respectively.Meanwhile,both materials showed high selectivity for palladium ions when coexisting with 10 other competing ions.This work provides a class of adsorbents with excellent selectivity to palladium ions,and provides a new idea for the recycling of palladium ions.