期刊
SCIENTIFIC REPORTS
卷 11, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41598-020-79614-2
关键词
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资金
- Intelligent Cosmos Academic Foundation
- Akita University
- JSPS KAKENHI [18K11705, 19H04309]
- Grants-in-Aid for Scientific Research [19H04309, 18K11705] Funding Source: KAKEN
Impregnated with 1,3-bis(2-(octylthio)propan-2-yl)benzene, Amberlite XAD-7 resin shows potential for efficient recovery of platinum group metals. The system demonstrates good reusability and high selectivity for Pd(II).
Extractant-impregnated resins have potential for recovering platinum group metals selectively and efficiently. Herein, 1,3-bis(2-(octylthio)propan-2-yl)benzene (1), a pincer-type extractant, was impregnated in Amberlite XAD-7 resin (1-EIR), and the batch Pd(II) sorption conditions, including impregnated amount, shaking time, Pd(II) concentration, HCl concentration, and Pd(II) desorption reagents, were optimized. The maximum Pd(II) sorption capacity of 1-EIR was 49 mg g(-1) after 24 h in a 700 ppm Pd(II) solution. Over 20 adsorption-desorption cycles, 1-EIR showed good reusability, with a sorption percentage (S%) of >92%. However, not all Pd(II) was desorbed from 1-EIR. Complete Pd(II) collection was achieved by combining desorption with flaking of the Pd-extractant complex from Pd(II)-loaded 1-EIR by Soxhlet extraction, as similar to 13 mg g(-1) remained after the 20th adsorption-desorption cycle by absorptiometric method. The sorption mechanism was elucidated based on the Langmuir isotherm model, thermodynamic parameters, and sorption kinetics. Pd(II) sorption by 1-EIR was spontaneous and endothermic, and the sorption kinetics followed a pseudo-second-order model. Notably, 1-EIR also exhibited high selectivity for Pd(II) from a simulated mixed metal solution and a spent automotive catalyst leachate (S% = 98% and > 99%, respectively). Thus, this extractant-impregnated system is promising for selective Pd(II) recovery from spent automotive catalysts and other secondary resources.
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