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  • 1995-1999  (2)
  • 1980-1984  (2)
  • 2-hydroxycyanoethane  (2)
  • antimony  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Zinc electrowinning from acidic sulphate solutions. Part III: Effects of quaternary ammonium bromides (1999)
    Springer
    Journal of applied electrochemistry 29 (1999), S. 1229-1235 
    Details
    ISSN: 1572-8838
    Schlagwort(e): additive ; antimony ; current efficiency ; power consumption ; zinc electrowinning
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract The effects of the organic additives cetyltrimethylammonium bromide (CTABr) and tetrabutyl ammonium bromide (TBABr) on the electrowinning of zinc from acidic sulphate solutions were studied in the presence and absence of trace amounts of antimony(iii). The results indicated that CTABr has similar properties to the commonly used industrial additive glue with respect to current efficiency, power consumption, polarization behaviour, and the crystallographic orientation and surface morphology of the zinc deposits. TBABr was generally less useful with respect to all these properties. Voltammetric studies indicate that polarisation for zinc electrodeposition decreased in the order CTABr 〉 glue 〉 TBABr. The nature of the electrode reactions were investigated through measurements of exchange current densities, Tafel slopes and transfer coefficients.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003459822142
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  • 2
    Digitale Medien
    Digitale Medien
    Electrochemistry of copper in aqueous acetonitrile (1981)
    Springer
    Journal of solution chemistry 10 (1981), S. 757-774 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Cu(II)/Cu(I) couple ; Cu(I)/Cu(0) couple ; acetonitrile-water mixtures ; Fe(III) ; 2-hydroxycyanoethane ; electrochemistry ; voltammetry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The electrochemical characteristics of the Cu (II)/Cu (I) and the Cu (I)/Cu (0) couples at platinum, carbon, mercury and copper have been studied in acetonitrile-water (AN-H2O) mixtures. All the electrode processes are moderately fast with mercury the fastest but slower on platinum and carbon paste in that order. A slow chemical step precedes oxidation of Cu (I) to Cu (II) on allectrodes in solutions of high AN content. The slow step may be partial removal of AN from the solvated Cu (I) ion prior to electron transfer. Electrode processes are faster in chloride ions than in sulfate ion solutions. Reduction of Cu (I) in AN−H2O is quite slow on glassy carbon. Adsorption of AN on platinum and carbon influences the processes. Diffusion coefficients in sulfate solutions are in the order, Cu (I) (AN−H2O)〉Cu (II)(AN−H2O)〉Fe (III)(H2O) and 2-hydroxy-cyanoethane (2-HCE) strongly decreases the mobility of Cu (I) when added to H2O. The relevance of the measurements to hydrometallurgical processes is considered. CuSO4 in 30% v/v AN−H2O is a ‘faster’ oxidant than the common oxidant Fe2(SO4)3 in H2O because of the greater mobility and faster electron acceptance from a corroding surface of Cu (II). Only in solutions of very high nitrile content is the reduction potential of CuSO4 as high as that of Fe2(SO4)3 in H2O.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00649487
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  • 3
    Digitale Medien
    Digitale Medien
    Zinc electrowinning from acidic sulphate solutions Part II: Effects of triethylbenzylammonium chloride (1998)
    Springer
    Journal of applied electrochemistry 28 (1998), S. 915-920 
    Details
    ISSN: 1572-8838
    Schlagwort(e): Zinc electrowinning ; antimony ; triethylbenzylammonium chloride ; current efficiency ; polarization ; morphology ; power consumption
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract The effects of triethylbenzylammonium chloride (TEBACl) on the electrowinning of zinc from acidic sulfate solutions have been studied in the presence and absence of antimony(iii). The factors considered included the current efficiency (CE), power consumption, polarisation behaviour, and the crystallographic orientations and surface morphology of the deposits. Compared with the traditional industrial additive, glue, the addition of TEBACl increased CE, reduced power consumption and improved the surface morphology. Maximum CE and minimum power consumption were obtained at 2mgdm−3 TEBACl and 0.01mgdm−3 Sb(iii). The exchange current density, Tafel slope and transfer coefficient were determined to elucidate the nature of the electrode reactions involved.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003404130043
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  • 4
    Digitale Medien
    Digitale Medien
    Solvation of ions, part XXX. Thermodynamics of transfer of copper ions from water to solvent mixtures (1982)
    Springer
    Journal of solution chemistry 11 (1982), S. 495-508 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Thermodynamic transfer quantities ; acetonitrile ; pyridine ; 2-hydroxycyanoethane ; aqueous organic solvent mixtures ; Cu2+, Cu+, and Ag+ ions ; hydrometallurgy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Free energies and Walden products show that the Cu+ and Ag+ ions are specifically solvated by acetonitrile (AN), 2-hydroxycyanoethane (HAN), and by pyridine (Py) whereas Na+ is specifically solvated by water, in mixtures of these organics with water. The Cu2+ ion is specifically solvated by pyridine in pyridine-water mixtures, but by water in acetonitrile-water mixtures. Ion-solvent, coordinated solvent-bulk solvent, and solvent-solvent interactions produce large entropy losses in the order Cu+≫Ag+〉Na+ for transfer of these ions from water to dilute acetonitrile-water. The metallurgically important oxidations of copper, silver, CuS and Cu2 with CuSO4 in water are strongly favored in an enthalpic and free energy sense by the addition of acetonitrile, but addition of acetonitrile also produces a large loss of entropy for the reactions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00647111
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