Hu Guangyuan, Wang Zhiwei, Xia Changqing, Wang Xinliang, He Hongxing, Nie Zhifeng, Wang Shixing, Li Weili
Yunnan Key Laboratory of Metal-Organic Molecular Materials and Device, College of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China.
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China.
ACS Appl Mater Interfaces. 2024 Aug 14;16(32):42976-42985. doi: 10.1021/acsami.4c08841. Epub 2024 Aug 1.
The recovery of gold from industrial effluents is crucial for environmental conservation, sustainable resource management, and promoting the green development of gold resources. We designed a Zr-based MOF (UKM-78) by incorporating functional organic ligands that resemble amino groups, using MOFs' inherent sieving effect for ion separation. This novel material exhibited enhanced gold recovery under acidic conditions, with an adsorption capacity three times and an adsorption rate four times higher than those of nonfunctionalized UKM-77. Notably, UKM-78 efficiently captured gold solutions at concentrations as low as 1 ppm and achieved an adsorption rate exceeding 90%, owing to the electrostatic interactions and coordination between its functionalized groups and the synergistic effect of its porous structure. Despite multiple regeneration cycles, UKM-78 retains 99.4% of its adsorption capacity. X-ray photoelectron spectroscopy (XPS), kinetic studies, and thermodynamics collectively demonstrated that Au(III) binding on UKM-78 involved cooperative electrostatic interactions and chemical adsorption through coordination. This study highlights the potential of MOFs for efficient and sustainable recovery of gold from complex waste streams.
从工业废水中回收金对于环境保护、可持续资源管理以及促进金资源的绿色开发至关重要。我们通过引入类似氨基的功能性有机配体设计了一种锆基金属有机框架材料（UKM-78），利用金属有机框架材料固有的筛分效应进行离子分离。这种新型材料在酸性条件下表现出更高的金回收率，其吸附容量是非官能化的UKM-77的三倍，吸附速率是非官能化的UKM-77的四倍。值得注意的是，由于其官能团之间的静电相互作用和配位作用以及多孔结构的协同效应，UKM-78能够有效地捕获低至1 ppm浓度的金溶液，吸附率超过90%。尽管经过多次再生循环，UKM-78仍保留其99.4%的吸附容量。X射线光电子能谱（XPS）、动力学研究和热力学共同表明，UKM-78上的Au(III)结合涉及协同静电相互作用和通过配位的化学吸附。这项研究突出了金属有机框架材料从复杂废物流中高效且可持续回收金的潜力。
