Nickel recovery from electronic waste II Electrodeposition of Ni and Ni–Fe alloys from diluted sulfate solutions

Journal Article · Fri Nov 15 00:00:00 EST 2013 · Waste Management

DOI:https://doi.org/10.1016/J.WASMAN.2013.06.001· OSTI ID:22300321

Robotin, B. ^[1]; Ispas, A. ^[2]; Coman, V. ^[1]; Bund, A. ^[2]

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1. Babes-Bolyai University, Faculty of Chemistry and Chemical Engineering, 11 Arany Janos Street, RO-400028 Cluj-Napoca (Romania)
2. Fachgebiet Elektrochemie und Galvanotechnik II, Technische Universität Ilmenau, D-98693 Ilmenau (Germany)

Highlights: • Ni can be recovered from EG wastes as pure Ni or as Ni–Fe alloys. • The control of the experimental conditions gives a certain alloy composition. • Unusual deposits morphology shows different nucleation mechanisms for Ni vs Fe. • The nucleation mechanism was progressive for Ni and instantaneous for Fe and Ni–Fe. - Abstract: This study focuses on the electrodeposition of Ni and Ni–Fe alloys from synthetic solutions similar to those obtained by the dissolution of electron gun (an electrical component of cathode ray tubes) waste. The influence of various parameters (pH, electrolyte composition, Ni{sup 2+}/Fe{sup 2+} ratio, current density) on the electrodeposition process was investigated. Scanning electron microscopy (SEM) and X-ray fluorescence analysis (XRFA) were used to provide information about the obtained deposits’ thickness, morphology, and elemental composition. By controlling the experimental parameters, the composition of the Ni–Fe alloys can be tailored towards specific applications. Complementarily, the differences in the nucleation mechanisms for Ni, Fe and Ni–Fe deposition from sulfate solutions have been evaluated and discussed using cyclic voltammetry and potential step chronoamperometry. The obtained results suggest a progressive nucleation mechanism for Ni, while for Fe and Ni–Fe, the obtained data points are best fitted to an instantaneous nucleation model.

• OSTI ID: 22300321
• Journal Information: Waste Management, Vol. 33, Issue 11; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMPEROMETRY
CATHODE RAY TUBES
CURRENT DENSITY
DISSOLUTION
ELECTRODEPOSITION
ELECTROLYTES
ELECTRON GUNS
IRON IONS
MATERIALS RECOVERY
MORPHOLOGY
NICKEL
NICKEL ALLOYS
NICKEL IONS
PH VALUE
SCANNING ELECTRON MICROSCOPY
SULFATES
VOLTAMETRY
X-RAY FLUORESCENCE ANALYSIS