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- W4200273112 abstract "• The new process for selective silver ions recovery from water is reported. • Ag + ions are catalytically reduced to Ag 0 by H 2 on the Pt in the separation step. • The Ag 0 is oxidized by air on the Pt catalyst within the regeneration step. • Both steps are performed at ambient temperature and gas pressure of 1 bar. • Ag + ions are separated from Cu 2+ ions due to higher reduction potential of Ag + . The two-step catalytic process is proposed for the recovery of silver ions from aqueous solutions. First, the Ag + -containing solution is enriched with hydrogen gas and recirculated through the Pt-loaded activated carbon (Pt/AC). The Ag + ions are reduced into the metal particles at ambient temperature and H 2 gauge pressure of 1 atmosphere. Next, the Ag particles precipitated on the Pt/AC are oxidized by air to form the pure Ag + concentrate and to regenerate the catalyst. The process was studied using pure AgNO 3 solutions at varied pH values (0.0, 1.5 and 3.9) in a batch mode system that was operated with Pt/AC particles loaded with 0.1–1.0% of Pt metal. The complete removal of Ag + ions was achieved within<2 h of hydrogenation of 1-liter AgNO 3 solutions with an initial concentrations of 100–1000 mgAg/L. The hydrogenation rate was not influenced by the pH value. Increasing the Pt load in the Pt/AC media above 0.25% did not result in an increase in the Ag + hydrogenation rate. Next, the process was applied for the separation of Ag + ions from H 2 SO 4 leachates of Ag 2 O-Zn batteries. Finally, it was shown that due to a large difference in standard reduction potentials the silver and the copper ions can be “kinetically” separated within the hydrogenation and the oxygenation steps of the process." @default.
- W4200273112 created "2021-12-31" @default.
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- W4200273112 date "2022-03-01" @default.
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- W4200273112 title "Catalytic selective recovery of silver from dilute aqueous solutions and e-waste leachates" @default.
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- W4200273112 doi "https://doi.org/10.1016/j.seppur.2021.120303" @default.
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