| المؤلفون: |
Ding A; College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China.; Institute of Zhejiang University-Quzhou, Quzhou 324000, China., Li M; Institute of Zhejiang University-Quzhou, Quzhou 324000, China., Liu C; Institute of Zhejiang University-Quzhou, Quzhou 324000, China., Chee TS; Department of Materials Science and Engineering, KAIST, Yuseong-gu, Daejeon 341, Republic of Korea., Yan Q; College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China., Lei L; College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China.; Institute of Zhejiang University-Quzhou, Quzhou 324000, China., Xiao C; College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China.; Institute of Zhejiang University-Quzhou, Quzhou 324000, China. |
| مستخلص: |
Palladium (Pd) and gold (Au) are the most often used precious metals (PMs) in industrial catalysis and electronics. Green recycling of Pd and Au is crucial and difficult. Here, we report a peroxydisulfate (PDS)-based advanced oxidation process (AOPs) for selectively recovering Pd and Au from spent catalysts. The PDS/NaCl photochemical system achieves complete dissolution of Pd and Au. By introducing Fe(II), the PDS/FeCl 2 ·4H 2 O solution functioned as Fenton-like system, enhancing the leaching efficiency without xenon (Xe) lamp irradiation. Electron paramagnetic resonance (EPR), 18 O isotope tracing experiments, and density functional theory calculations revealed that the reactive oxidation species of SO 4 · - , ·OH, and Fe(IV)═O were responsible for the oxidative dissolution process. Lixiviant leaching and one-step electrodeposition recovered high-purity Pd and Au. Strong acids, poisonous cyanide, and volatile organic solvents were not used during the whole recovery, which enables an efficient and sustainable precious metal recovery approach and encourage AOP technology for secondary resource recycling. |
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