文献名： Selective recovery of gold ions in aqueous solutions by a novel trithiocyanuric-Zr based MOFs adsorbent

作者 ： Zhen Huang , Minghu Zhao , Shixing Wang , Linqing Dai , Libo Zhang , Chen Wang

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

National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology, Kunming 650093, PR China

摘要： A trithiocyanuric-Zr based MOFs adsorbent (ZT-MOFs) was synthesized by using trithiocyanuric acid as a linker and zirconium chloride as a metal matrix and used to recover Au(III). ZT-MOFs was characterized by FT-IR, BET, Raman and FE-SEM. ZT-MOFs are porous material and have good stability in the range of pH 1–9. ZT-MOFs showed a higher adsorption  capacity for Au(III) (333.34 mg/g) at 480 min and  pH = 7. The  experimental data fitted to Freundlich and pseudo second-order models, indicating a heterogeneous multi-layer chemadsorption is the dominated step. ZT-MOFs separated selectively Au(III) from laboratory wastewater containing various interfering ions. The removal rate of Au(III) decreased only from 94.5% to 87.5% after 4 adsorption and desorption cycles. This shows that ZT-MOFs have good repeatability. FT-IR, XPS and Zeta potential data shows that the adsorption mechanism of Au(III) on ZT-MOFs is coordination. Therefore, ZT-MOFs have great potential in extracting Au(III) from wastewater.