Synthesis and Evaluation of Fe Nanowire and Nanorod by Electro-Chemical Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.616.237 ◽

2014 ◽

Vol 616 ◽

pp. 237-241

Author(s):

Atsushi Nakahira ◽

Shinya Yamamoto ◽

Hiroshi Onodera

Keyword(s):

Chemical Process ◽

Porous Alumina ◽

Acid Solutions ◽

Electrodeposition Process ◽

Mixed Acid ◽

Chemical Treatments ◽

Aluminium Metal ◽

Tens Nanometer

Nanoporous structured alumina templates for the synthesis of Fe nanowires were synthesized by the anodization of aluminium metal under various synthetic conditions in some acid solutions. Subsequently, using this nanoporous structured alumina as a template, Fe nanowires with some tens nanometer in diameter and some micron in length was successfully synthesized by both electrodeposition process into various types of porous alumina templates and chemical treatments in mixed-acid solutions to remove the templates. Effects of anodization treatments of aluminium for a porous template on the microstructure of Fe nanowires and nanorods were examined. As a result, the morphology of Fe products obtained by electrodeposition process could be designed with the template obtained under the synthetic conditions (anodization temperatures and electrodeposition conditions etc).

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ELECTRODEPOSITION OF COPPER IN ULTRASONIC FIELD FROM SPENT ETCHING SOLUTIONS

IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA ◽

10.6060/ivkkt.20206311.6242 ◽

2020 ◽

Vol 63 (11) ◽

pp. 71-76

Author(s):

Maria P. Larionova ◽

Nina D. Solovieva ◽

Elena A. Savelieva

Keyword(s):

Nitric Acid ◽

Copper Ions ◽

Nitrate Solution ◽

Ultrasonic Field ◽

Initial Time ◽

Copper Extraction ◽

Acid Solutions ◽

Copper Electrodeposition ◽

Electrodeposition Process ◽

Nitric Acid Solutions

It is studied the regeneration and utilization possibility of spent nitric acid solutions for copper and its alloys etching for the creating an environmentally clean closed-cycle production of regenerated electrolytes. It is established that some difficulties arise when using the electrochemical method in the regeneration process of these solutions: during copper electrodeposition from spent copper-containing nitric acid solutions, nitric acid decomposes with vigorous evolution of nitrogen dioxide, which prevents copper ions reduction. In order to suppress the side process, it was proposed to partially neutralize the solution, not reaching the pH of copper hydration (pH 4-5). It is revealed that a decrease in the concentration of metal cations occurs due to partial neutralization of the nitric acid contained in the solution by concentrated alkali solution. The pulsed electrolysis mode was used to increase the efficiency of the metal ions electrodeposition process from dilute solutions. It is established that the using of pulsed electrolysis can reduce diffusion difficulties that arise in a dilute spent nitric acid copper-containing solution, thereby intensify the process of copper electrodeposition. It is showed that the prospects of using ultrasound to increase the rate of the copper electrodeposition process and improve the quality of the resulting coating. It is studied the ultrasound field effect on nucleation during copper electrodeposition in a pulsed mode from a partially neutralized electrolyte simulating the spent nitrate solution of etching copper alloys on various materials by the potentiostatic. It is established an increase in the number of copper nucleus that form on the studied substrates (graphite, copper, steel) at the initial time under the action of an ultrasonic field. It is concluded that the use of ultrasound allows to intensify the process of metal electrodeposition. An increase in current efficiency during copper electrodeposition and an increase in the copper extraction degree using ultrasonic field are achieved at lower cathodic current densities in a pulse. It is substantiated using of graphite foil and steel as cathode materials in the copper extraction from the spent nitric acid etching solution.

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Finding Chemical Pathways Toward the Valorization of Automobile-Service-Station Wastes

KnE Engineering ◽

10.18502/keg.v3i1.1467 ◽

2018 ◽

Vol 3 (1) ◽

pp. 636

Author(s):

Janina Chauca ◽

María Rosales ◽

Diego Muñoz ◽

Carlos Banchón

Keyword(s):

Heavy Metals ◽

Chemical Process ◽

Environmental Concern ◽

Polyaromatic Hydrocarbons ◽

Oily Sludge ◽

Contaminated Water ◽

Service Station ◽

Chemical Treatments ◽

Oil Water ◽

Oil Wastewater

Automobile-service-station wastes make for an acute environmental concern because they contain polyaromatic hydrocarbons, heavy metals, surfactants, and other harmful elements. An eco-friendly way to treat and take advantage of these wastes is embodied in the concept called "valorization". In the present work, valorization is described as a chemical process to remove solids from contaminated water and to stabilize oily sludge into a saponified product. Electrocoagulation and coagulation with aluminum were applied to separate oil-water emulsions and removed 99.7% of turbidity. Both coagulation processes obtained approximately 0.85 kg of treated water and 0.027 kg of dried oily sludge per kg of wastewater. A saponification process with dosages of 10% NaOH stabilized the dried oily sludge. In hopes of finding pathways to valorize wastes, chemical treatments with aluminum and NaOH obtained a product that can be used as a surfactant or as an energy source.Keywords: sludge, electrocoagulation, saponification, oil, wastewater

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Chemical Synthesis of Graphite Perfluorooctanesulfonate Using K2MnF6in Hydrofluoric Acid or Mixed Acid Solutions

Chemistry of Materials ◽

10.1021/cm981060v ◽

1999 ◽

Vol 11 (4) ◽

pp. 1100-1109 ◽

Cited By ~ 28

Author(s):

Xuerong Zhang ◽

Michael M. Lerner

Keyword(s):

Chemical Synthesis ◽

Hydrofluoric Acid ◽

Acid Solutions ◽

Mixed Acid

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Fabrication of CoFe2O4 Nanowire Using a Double-Pass Porous Alumina Template with a Large Range of Pore Diameters

Crystals ◽

10.3390/cryst10040331 ◽

2020 ◽

Vol 10 (4) ◽

pp. 331

Author(s):

Wei Chen ◽

Hui Zheng ◽

Dongping Hu ◽

Qiong Wu ◽

Peng Zheng ◽

...

Keyword(s):

Porous Alumina ◽

Aluminum Foil ◽

Nanowire Arrays ◽

Acid Electrolyte ◽

Double Pass ◽

Alumina Template ◽

Mixed Acid ◽

Porous Alumina Template ◽

Electrochemical Deposition Method ◽

Pmma Filler

In this work, CoFe2O4 nanowire was fabricated by using a self-designed double-pass porous alumina template. The double-pass porous alumina template was prepared by a two-step oxidation method using a mixed acid (phosphoric acid and oxalic acid) electrolyte and polymethyl methacrylate (PMMA) filler. The combustion of aluminum foil at a high voltage has been effectively resolved by using this mixed acid electrolyte. Additionally, the range of pore diameters has been obviously increased to 230–400 nm by using PMMA as the filler, which can prevent contact between the pore and solution when removing the barrier layer. Subsequently, CoFe2O4 ferrite nanowire arrays were successfully fabricated into the double-pass porous alumina template by an electrochemical deposition method, and show an anisotropic feature of magnetic properties.

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