Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650093, PR China; State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, Yunnan, 650093, PR China.
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650093, PR China.
Environ Res. 2022 Jul;210:112870. doi: 10.1016/j.envres.2022.112870. Epub 2022 Feb 9.
With the boom of modern industry, the demand for precious metals palladium (Pd) and gold (Au) is increasing. However, the discharge of Pd(II) and Au(III) wastewater has caused environmental pollution and shortage of resources. Here, a new metal-organic frameworks adsorbent (MOF-AFH) was synthesized to efficiently separate Pd(II) and Au(III) from the water. The adsorption behavior of Pd(II) and Au(III) was explored at the same time. When gold and palladium are adsorbed separately, the adsorption capacity of gold and palladium is 389.02 mg/g and 191.27 mg/g, respectively. The equilibration time is 3 h. When gold and palladium coexist, the adsorption capacities of Au(III) and Pd(II) are 238.71 and 115.02 mg/g, respectively. The experimental results show that the adsorption of Pd(II) and Au(III) on MOF-AFH is a single-layer chemical adsorption, which is an endothermic process. MOF-AFH has excellent selectivity and after MOF-AFH is repeatedly used 4 times, the removal effect can still reach more than 90%. The adsorption mechanisms include reduction reaction and chelation with N and O-containing functional groups on the adsorbent. There is also electrostatic interaction for Au(III) adsorption. The adsorbent can be used to efficiently recover gold and palladium from wastewater.
随着现代工业的蓬勃发展，对钯（Pd）和金（Au）等贵金属的需求日益增加。然而，钯（Ⅱ）和金（Ⅲ）废水的排放已经造成了环境污染和资源短缺。在这里，我们合成了一种新型的金属有机骨架吸附剂（MOF-AFH），用于从水中高效分离钯（Ⅱ）和金（Ⅲ）。同时，我们还探讨了钯（Ⅱ）和金（Ⅲ）的吸附行为。当分别吸附金和钯时，金和钯的吸附容量分别为 389.02mg/g 和 191.27mg/g，平衡时间为 3 小时。当金和钯共存时，Au(III)和 Pd(II)的吸附容量分别为 238.71mg/g 和 115.02mg/g。实验结果表明，钯（Ⅱ）和金（Ⅲ）在 MOF-AFH 上的吸附是单层化学吸附，是一个吸热过程。MOF-AFH 具有优异的选择性，经过 4 次重复使用后，去除效果仍能达到 90%以上。吸附机制包括还原反应和与吸附剂上含 N 和 O 官能团的螯合作用，Au(III)的吸附还存在静电相互作用。该吸附剂可用于从废水中高效回收金和钯。
