pH‐D ependent Aqueous Solution‐Grown Highly Nanocrystalline Nickel Cobalt Sulfides ( NiCo 2 S 4 )

2021 ◽  
Author(s):  
Youngjin Jeon ◽  
Kwanbeom Choi ◽  
Seungje Lee ◽  
Jungseok Heo
Keyword(s):  
Aqueous Solution ◽  
Nanocrystalline Nickel ◽  
Nickel Cobalt

Dielectric studies of nanocrystalline nickel–cobalt oxide

2007 ◽  
Vol 399 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Nisha J. Tharayil ◽  
S. Sagar ◽  
R. Raveendran ◽  
A.V. Vaidyan
Keyword(s):  
Cobalt Oxide ◽  
Dielectric Studies ◽  
Nanocrystalline Nickel ◽  
Nickel Cobalt ◽  
Nickel Cobalt Oxide

Removal of copper, nickel, cobalt and manganese from aqueous solution by kaolinite

2003 ◽  
Vol 37 (4) ◽  
pp. 948-952 ◽  
Author(s):  
Ömer Yavuz ◽  
Yalçin Altunkaynak ◽  
Fuat Güzel
Keyword(s):  
Aqueous Solution ◽  
Copper Nickel ◽  
Nickel Cobalt

Structure of Nickel and Nickel-Cobalt Electrodeposits

1972 ◽  
Vol 30 ◽  
pp. 656-657 ◽  
Author(s):  
Anthony W. Thompson
Keyword(s):  
Aqueous Solution ◽  
Fracture Toughness ◽  
Grain Size ◽  
Room Temperature ◽  
Pure Nickel ◽  
Stress Axis ◽  
Nickel Cobalt ◽  
Thin Foils ◽  
Mean Linear Intercept ◽  
The Mean

Electrodeposited plates 6 mm thick were prepared from sulfamate baths by J. W. Dini and H. R. Johnson of this laboratory. The plates were pure nickel or an alloy of 57 Ni-43 Co. Tensile and fracture toughness specimens were machined from these plates; thin foils were cut parallel to the deposition plane, and also perpendicular to that plane and to the stress axis of tensile specimens. R. E. Gorniak prepared the foils by electropolishing at 3 V in an aqueous solution of 48% H3SO4, 32% H2SO4 at room temperature. Foils were examined in a Philips EM300.As Fig. 1 shows, the grain size of the nickel was uniform and small. The true volume grain diameter d was calculated from the mean linear intercept The variations in contrast between grains in Fig. 1 persisted through large, slowly-performed changes in tilt, which suggests that a strong texture was not present.

scholarly journals RECOVERY OF METALS FROM ELECTROACTIVE COMPONENTS OF SPENT Ni-MH BATTERIES AFTER LEACHING WITH FORMIC ACID

Detritus ◽  
2021 ◽  
pp. 68-77
Author(s):  
Pedro Rosário Gismonti ◽  
Jéssica Frontino Paulino ◽  
Julio Afonso
Keyword(s):  
Aqueous Solution ◽  
Formic Acid ◽  
Sodium Formate ◽  
Sodium Oxalate ◽  
Slow Evaporation ◽  
Nickel Metal ◽  
Nickel Metal Hydride ◽  
Aqueous Sodium ◽  
Nickel Cobalt ◽  
Cobalt Iron

this work describes a route for recovering nickel, cobalt, iron, zinc and lanthanides from spent nickel-metal hydride batteries. Formic acid was used as leachant. Experiments were run at 25-50°C for 1-4 h. Under the best conditions leaching yields surpassed 99 wt.%, except for iron. The insoluble matter contains almost solely iron as iron(III) basic formate. The leachate went through six separation procedures, combining solvent extraction with D2EHPA as extractant, and precipitation reactions. Fe2+ and Zn2+ were extracted together (> 99 wt.%) from the original leachate (pH ~1.5). Yttrium and lanthanides were precipitated as oxalates directly from the raffinate (> 99.9 wt.%) upon addition of sodium oxalate. In the next steps, Mn2+ and Co2+ were extracted with D2EHPA at buffered pH (3 and ~4.8, respectively), after adding NaOHaq. About 10 wt.% of leached Ni2+ was coextracted with Co2+. The remaining Ni2+ was precipitated from the raffinate after addition of aqueous sodium oxalate at pH 6. After precipitation of Al3+ upon addition of NaOHaq. until pH ~8, sodium formate was recovered after slow evaporation of the final aqueous solution at 60oC. It contains ~90 wt.% of the formate present in the leachant.

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