Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 142, Issue 3, Pages 1574-1583Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b12196
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Funding
- national Science Foundation of China [U1832152, 21665021, 21771024, 21871028]
- Beijing Municipal Natural Science Foundation [2182029]
- West China first-class Disciplines Basic Medical Sciences at Ningxia Medical University [NXYLX1(2017B07)]
- Ningxia Key research and Development Program (Special Talents) [2018BEG03017]
- Foundation of State Key Laboratory of High - Efficiency Utilization of Coal and Green Chemical Engineering [2017-1(07)]
- US National Science Foundation [DMR 1708254]
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The new material Polypyrrole-Mo3S13 (abbr. Mo(3)S(1)3-Ppy) is a new material prepared by ion -exchange between Ppy-NO3 and (NH4)(2)Mo3S13. The Mo3S13-Ppy was designed to exhibit strong selectivity for Ag+ and highly toxic Hg2+ in mixtures with other ions. It displays an apparent selectivity ranking of Hg2+ > Ag+ >= Co2+, Ni2+, Cu2+, Zn2+, Cd2+, and Pb2+. The strong affinity of Mo3S13-Ppy for Ag+ and Hg2+ was confirmed with extremely high distribution coefficients (K-d) (similar to 10(7) mL/g) and remarkable removal efficiencies (>99.99%), resulting in <1 ppb concentrations of these ions. Furthermore, Mo3S13-Ppy achieved excellent separation selectivity for Ag+ from Cu2+ (even at a high Cu2+/Ag+ ratio, the molar ratio of 867 and mass ratio of 500) because of the special structure of Mo3S132- and its component Mo4+ and (S-2)(2-.) This is promising for the direct extraction of low-grade silver from copper-rich minerals. The maximum Ag uptake capacity of 408 mg/g is redox-based and surprisingly involves the deposition of large, millimeter sized, metallic silver (Ag-0) crystals on the surface of Mo3S13-Ppy.
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