513. Stability constants of copper(II) chloride complexes

Morris, D.F.C.; Short, E. L.

doi:10.1039/jr9620002672

Cited by 31 publications

(13 citation statements)

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“…However, since EDTA is too expensive for application in industrial hydrometallurgical processes, ammonia was tested as a stripping agent. In ammonia solutions, copper will form the complex [Cu(NH 3 ) 4 ] 2+ and zinc(II) the complex [Zn(NH 3 ) 4 ] 2+ which have a much higher stability constant (β = 10 12 and 10 9 , respectively) (Holleman et al, 2001;Sharma R.K., 2007) compared to the anionic chloro complexes [CuCl 4 ] 2and [ZnCl 4 ] 2at low chloride concentrations (β = 1 and 10 1 , respectively) and these complexes are easily transferred to the aqueous phase (Bjerrum and Skibsted, 1977;Morris and Short, 1962;Ohlson and Vannerberg, 1974;Short and Morris, 1961).…”

Section: Stripping Experimentsmentioning

confidence: 99%

Dissolution of metal oxides in an acid-saturated ionic liquid solution and investigation of the back-extraction behaviour to the aqueous phase

et al. 2014

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The dissolution of metal oxides in an acid-saturated ionic liquid, followed by selective stripping of the dissolved metal ions to an aqueous phase is proposed as a new ionometallurgical approach for the processing of metals in ionic liquids. The hydrophobic ionic liquid trihexyl(tetradecyl)phosphonium chloride (Cyphos IL 101) saturated with a concentrated aqueous hydrochloric acid solution was used to dissolve CaO, NiO, MnO, CoO, CuO, ZnO and Fe 2 O 3. It was found that nickel(II) and calcium(II) could be separated from all other transition metals present in the ionic liquid phase by stripping at high chloride concentrations. By scrubbing the ionic liquid solutions phase with water, manganese(II) and cobalt(II) could be stripped together with a fraction of iron(III) and copper(II), leaving zinc(II) and the remainder of copper(II) and iron(III) in the ionic liquid phase. These metal ions could be removed from the ionic liquid using ammonia. Copper(II) and zinc(II) formed ammine complexes and were back-extracted, while iron(III) precipitated as iron(III) hydroxide. After removal of all the metals present in the ionic liquid phase, the ionic liquid was prepared for reuse. Unfortunately, the mutual separations nickel-calcium, cobaltmanganese, or zinc-copper could not be achieved. This system would be useful when nickel is the metal of interest, since separation of nickel from all other transition metals present in the solution is achieved by one stripping step.

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Section: Stripping Experimentsmentioning

confidence: 99%

Dissolution of metal oxides in an acid-saturated ionic liquid solution and investigation of the back-extraction behaviour to the aqueous phase

et al. 2014

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“…Publications on the higher complexes are of limited number, refer to very high ionic strengths, and the reported constants differ considerably [62MSc,73SCc,77BSa,81AHa,82WLa,83BWa,83RFa,86RAa,89IPa]. These values cannot be used in a statistical treatment, and we cannot recommend any constants for the formation of CuCl 3 -and CuCl 4 2-even though such complexes have been characterized at very high chloride concentrations.…”

Section: Formation Of Cucl 3 -And Cucl 4 2-mentioning

confidence: 99%

Chemical speciation of environmentally significant metals with inorganic ligands Part 2: The Cu2+-OH-, Cl-, CO32-, SO42-, and PO43- systems (IUPAC Technical Report)

Powell

Brown

Byrne

et al. 2007

Pure and Applied Chemistry

169

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Complex formation between CuII and the common environmental ligands Cl-, OH-, CO32-, SO42-, and PO43- can have a significant effect on CuII speciation in natural waters with low concentrations of organic matter. Copper(II) complexes are labile, so the CuII distribution amongst these inorganic ligands can be estimated by numerical modeling if reliable values for the relevant stability (formation) constants are available. This paper provides a critical review of such constants and related thermodynamic data. It recommends values of log10βp,q,r° valid at Im = 0 mol kg-1 and 25 °C (298.15 K), along with the equations and specific ion interaction coefficients required to calculate log10βp,q,r values at higher ionic strengths. Some values for reaction enthalpies, ΔrHm, are also reported where available. In weakly acidic fresh water systems, in the absence of organic ligands, CuII speciation is dominated by the species Cu2+(aq), with CuSO4(aq) as a minor species. In seawater, it is dominated by CuCO3(aq), with Cu(OH)+, Cu2+(aq), CuCl+, Cu(CO3)OH-, Cu(OH)2(aq), and Cu(CO3)22- as minor species. In weakly acidic saline systems, it is dominated by Cu2+(aq) and CuCl+, with CuSO4(aq) and CuCl2(aq) as minor species.

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“…This complex probably forms because it is more stable than ZnCl 2 , because CuCl 2 - has a higher cumulative stability constant than ZnCl 2 . [30,31]…”

Section: Resultsmentioning

confidence: 99%

“…This complex probably forms because it is more stable than ZnCl2, because CuCl2⁻ has a higher cumulative stability constant than ZnCl2. [30,31] XPS and ToF-SIMS analyses did not detect Zn on the surface of NP3, likely because the analysis depths of these techniques are shallow (<10 nm and 1 nm, respectively). [32], [33] In addition, selective leaching of Zn in the presence of Cu is spontaneous and highlyfavourable, since it has a stronger tendency to oxidize than Cu, [34] which also could contribute to our inability to detect Zn using XPS and ToF-SIMS.…”

Section: Coating Morphology and Chemistrymentioning

confidence: 99%

An Engineered Nanocomposite Copper Coating with Enhanced Antibacterial Efficacy

Nakhaie

Williams

Velapatiño

et al. 2022

Preprint

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Contaminated surfaces are a major source of nosocomial infection. To reduce microbial bioburden and surface-based transmission of infectious disease, the use of antibacterial and self-sanitizing surfaces, such as copper (Cu), is being explored in clinical settings. Cu has long been known to have antimicrobial activity. However, Gram-positive microorganisms, a class that includes pathogens commonly responsible for hospital-acquired infection such as Staphylococcus aureus and Clostridioides difficile, are more resilient to its biocidal effect. Inspired by inherently bactericidal nanostructured surfaces found in nature, we have developed an improved Cu coating, engineered to contain nanoscale surface features and thus increase its antibacterial activity against a broader range of organisms. In addition, we have established a new method for facilitating the rapid and continuous release of biocidal metal ions from the coating, through incorporation of an antibacterial metal salt (ZnCl2) with a lower reduction potential than Cu. Electrophoretic deposition (EPD) was used to fabricate our coatings, which serves as a low-cost and scalable route for modifying existing conductive surfaces with complex shape. By tuning both the surface morphology and chemistry, we were able to create a nanocomposite Cu coating that decreased the microbial bioburden of Gram-positive S.aureus by 94% compared to unmodified Cu.

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513. Stability constants of copper(II) chloride complexes

Cited by 31 publications

References 0 publications

Dissolution of metal oxides in an acid-saturated ionic liquid solution and investigation of the back-extraction behaviour to the aqueous phase

Dissolution of metal oxides in an acid-saturated ionic liquid solution and investigation of the back-extraction behaviour to the aqueous phase

Chemical speciation of environmentally significant metals with inorganic ligands Part 2: The Cu2+-OH-, Cl-, CO32-, SO42-, and PO43- systems (IUPAC Technical Report)

An Engineered Nanocomposite Copper Coating with Enhanced Antibacterial Efficacy

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