Properties of low power spark ablation in aqueous solution for dissolution of precious metals and alloys

2006 ◽  
Vol 61 (7) ◽  
pp. 817-823 ◽  
Author(s):  
Douglas Goltz ◽  
Michael Boileau ◽  
Ian Plews ◽  
Kimberly Charleton ◽  
Michael W. Hinds
Keyword(s):  
Aqueous Solution ◽  
Low Power ◽  
Precious Metals ◽  
Metals And Alloys

Adsorptive recovery of precious metals from aqueous solution using nanomaterials – A critical review

2021 ◽  
Vol 445 ◽  
pp. 214072
Author(s):  
Ziyong Chang ◽  
Liang Zeng ◽  
Chunbao Sun ◽  
Peng Zhao ◽  
Jiayu Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Critical Review ◽  
Precious Metals ◽  
Adsorptive Recovery

scholarly journals Precipitation of Pt Nanoparticles inside Ion-Track-Etched Capillaries

2020 ◽  
Vol 4 (1) ◽  
pp. 8 ◽  
Author(s):  
Shunya Yamamoto ◽  
Hiroshi Koshikawa ◽  
Tomitsugu Taguchi ◽  
Tetsuya Yamaki
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Electron Beam ◽  
Metal Nanoparticles ◽  
Precious Metal ◽  
Precious Metals ◽  
Pt Nanoparticles ◽  
Polyimide Film ◽  
Sodium Hypochlorite Solution ◽  
Transmission Electron

Ion-track-etched capillaries containing nanoparticles of precious metals (e.g., Pt, Au, and Ag) can be applied to plasmonic absorber materials. The precipitation of homogeneous and highly dispersed precious metal nanoparticles inside capillaries represents a key process. Ion-track-etched capillaries (diameter: ~500 nm, length: ~25 μm) were created in polyimide film by 350 MeV Xe irradiation (3 × 107 ions/cm2) and chemical etching (using a sodium hypochlorite solution). The films with capillaries were immersed in an aqueous solution containing 0.1–10 mmol/L H2PtCl6 and 0.5 vol% C2H5OH, and then irradiated with a 2 MeV electron beam up to a fluence of 1.4 × 1016 e/cm2. The Pt particles inside the capillaries were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The precipitation of Pt nanoparticles and isolated aggregates inside the capillaries was confirmed by TEM. The Pt nanoparticles tended to aggregate under increasing concentrations of H2PtCl6 in the aqueous solution; meanwhile, no changes in nanoparticle size were noted under increasing electron beam fluence. The results suggest that the proposed method can be used to form metal nanoparticles in nanosized capillaries with a high aspect ratio.

Deposition of ZnO thin films from aqueous solution in a low power plasma reactor

2015 ◽  
Vol 276 ◽  
pp. 186-194 ◽  
Author(s):  
Alexandre Ma ◽  
Frédéric Rousseau ◽  
Frédérique Donsanti ◽  
Daniel Lincot ◽  
Daniel Morvan
Keyword(s):  
Thin Films ◽  
Aqueous Solution ◽  
Low Power ◽  
Plasma Reactor ◽  
Zno Thin Films

Preparation of a zwitterionic polymer based on l-cysteine for recovery application of precious metals

RSC Advances ◽  
2016 ◽  
Vol 6 (110) ◽  
pp. 108689-108696 ◽  
Author(s):  
Huseyin Akbulut ◽  
Shuhei Yamada ◽  
Takeshi Endo
Keyword(s):  
Aqueous Solution ◽  
Aqueous Media ◽  
Precious Metals ◽  
High Recovery ◽  
Styrene Monomer ◽  
Zwitterionic Polymer

l-Cysteine-grafted polystyrene was synthesized from a cysteine-styrene monomer (Cys-Sty) in aqueous solution and used as a facile and selective high-recovery material for palladium(ii), platinum(iv), and gold(iii) ions from aqueous media.

scholarly journals Study of Mangosteen Peel (Garcinia mangostana L.) Waste Capability to Recover Au(III) and Ag(I) in Aqueous Solution

2020 ◽  
Vol 21 (1) ◽  
pp. 251
Author(s):  
Mellia Harumi ◽  
Rian Kurniawan ◽  
Agustiwandina Saputri ◽  
Dian Hanna Saraswati ◽  
Meissha Ayu Ardini ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Electronic Waste ◽  
Precious Metals ◽  
Soxhlet Extraction ◽  
Isotherm Model ◽  
Garcinia Mangostana ◽  
Maximum Capacity ◽  
Mangosteen Peel ◽  
Ph Conditions

Electronic waste (e-waste) has been confirmed containing some precious metals such as gold and silver. Mangosteen peel waste as eco-friendly adsorbent has been studied to recover Au(III) and Ag(I) successfully. Recovery was started through adsorbent preparation, consisting of soxhlet extraction and maceration. About 100 mg of adsorbent was dispersed into Au(III) and Ag(I) solutions in various pH conditions (2–6). The result proves that the optimum adsorptions of Au(III) and Ag(I) are at pH 2 and pH 6, respectively. Au(III) adsorption follows the isotherm model of Langmuir with a maximum capacity of 0.580 mmol/g (114.27 mg/g). Ag(I) adsorption follows the isotherm model of Freundlich with a maximum capacity of 0.511 mmol/g (55.10 mg/g).

New Perspectives on Moche Metallurgy: Techniques of Gilding Copper at Loma Negra, Northern Peru

1982 ◽  
Vol 47 (1) ◽  
pp. 3-30 ◽  
Author(s):  
Heather Lechtman ◽  
Antonieta Erlij ◽  
Edward J. Barry
Keyword(s):  
Aqueous Solution ◽  
Precious Metals ◽  
The South ◽  
Metal Artifacts ◽  
The North ◽  
Relative Chronology ◽  
Northern Peru

The metal objects found in 1969 at the north Peruvian site of Loma Negra, in the region of Cerro Vicús, form one of the largest and most important single groups of Moche metal artifacts known. Since the objects were looted from burials at the site, they are without context, seriously compounding the problems of their relative chronology within the Moche sequence and of their relations with Moche material from the coast farther to the south. Metallurgical studies of a group of gilt copper objects from Loma Negra have shown that the gilding was achieved by an electrochemical replacement plating process in which gold and silver are dissolved in an aqueous solution of corrosive minerals. The precious metals are then plated from solution onto the copper objects. Moche metal craftsmen can now be credited with having developed the two most sophisticated of Andean gilding procedures: depletion gilding and electrochemical replacement plating.

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