Ion-Pair Formation of a Copper(II)-Ammine Complex with an Anionic Surfactant and the Recovery of Copper(II) from Ammonia Medium by the Surfactant-Gel Extraction Method

Nakai, T.; Murakami, Yoshiko; Sasaki, Yoshiyuki; Fujiwara, Isamu; Shoji, Tetsuo

doi:10.2116/analsci.20.235

Cited by 8 publications

(6 citation statements)

References 15 publications

(16 reference statements)

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“…The constant of Ni(NH 3 ) 6 2+ is 2.0 × 10 8 , much higher than that of Co(NH 3 ) 6 2+ 2.0 × 10 4 . 91 It is experimentally observed that cobalt(II) nitrate hydroxide precipitates in an ammonia medium rather than forming amine complexes, 98 which is consistent with our observation that Co−N in Co(bdc)(ted) 0. For Ni(bdc)(ted) 0.5 , if we slightly increase the pressure to 9.7 Torr, condensation occurs the framework structure is broken (see Supporting Information Figure S16).…”

Section: +supporting

confidence: 85%

Stability and Hydrolyzation of Metal Organic Frameworks with Paddle-Wheel SBUs upon Hydration

et al. 2012

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Instability of most prototypical metal organic frameworks (MOFs) in the presence of moisture is always a limitation for industrial scale development. In this work, we examine the dissociation mechanism of microporous paddle wheel frameworks M(bdc)(ted) 0.5 [M=Cu, Zn, Ni, Co; bdc= 1,4-benzenedicarboxylate; ted= triethylenediamine] in controlled humidity environments. Combined in-situ IR spectroscopy, Raman, and Powder x-ray diffraction measurements show that the stability and modification of isostructual M(bdc)(ted) 0.5 compounds upon exposure to water vapor critically depend on the central metal ion. A hydrolysis reaction of water molecules with Cu-O-C is observed in the case of Cu(bdc)(ted) 0.5 . Displacement reactions of ted linkers by water molecules are identified with Zn(bdc)(ted) 0.5 and Co(bdc)(ted) 0.5 . In contrast, . Ni(bdc)(ted) 0.5 is less susceptible to reaction with water vapors than the other three compounds. In addition, the condensation of water vapors into the framework is necessary to initiate the dissociation reaction. These findings, supported by supported by first principles theoretical van der Waals density functional (vdW-DF) calculations of overall reaction enthalpies, provide the necessary information for determining operation conditions of this class of MOFs with paddle wheel secondary building units and guidance for developing more robust units.

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Section: +supporting

confidence: 85%

Stability and Hydrolyzation of Metal Organic Frameworks with Paddle-Wheel SBUs upon Hydration

et al. 2012

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“…Ammonia can effectively leach out zinc, from zinc–aluminum coating, forming tetra ammine zinc(II) hydroxide tetrahedral complex and chromium from chromium‐based pre‐treatment layer forming [Cr(NH 3 )] 3+ , that are soluble in water 26, 27. The four ammine ligands attached to the Zn can further react with the epoxide via hydrogen bonding.…”

Section: Discussionmentioning

confidence: 99%

Towards improving wet‐adhesion in a metal oxide‐polymer coating system

Devasahayam

2006

J of Applied Polymer Sci

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An investigation using a variable radius roll adhesion test (VaRRAT) revealed an irreversible increase in the wet-adhesion in a metal-oxide-polymer system, under specific experimental conditions. This observation is further confirmed by the T g measurements and the ATR-FTIR studies. The increase in wet-adhesion is attributed to late H 2 Ocatalyzed curing of the previously partially cured polymers (epoxy ring opening), as well as the formation of nanocomposite layer within the epoxy primer matrix, because of precipitation of the nanocrystals including zinc ammine complexes formed as a result of dissolution of the zinc/ aluminum alloy as well as the metal oxide pigments by the amine crosslinker. High activation energy of ϳ100 kJ mol Ϫ1 indicated a chemical process to be responsible for the adhesion gain.

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“…More than 99% copper could be extracted into the surfactant phase and 93% zinc remained in the aqueous phase. This work NaCl 0 °C 98.4 ± 1.5 13.5 ± 5.5 [21] a) average ± SD (5 samples)…”

Section: Separation Of Copper and Zinc In A Brass Alloymentioning

confidence: 95%

Surfactant Gel Extraction of Metal Ammine Complexes using SDS and KCl at Room Temperature, and a Small-angle X-ray Diffraction Study of the Surfactant Phase

Shoji

Ichimaru

Nozaki

et al. 2013

SERDJ

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Ion-Pair Formation of a Copper(II)-Ammine Complex with an Anionic Surfactant and the Recovery of Copper(II) from Ammonia Medium by the Surfactant-Gel Extraction Method

Cited by 8 publications

References 15 publications

Stability and Hydrolyzation of Metal Organic Frameworks with Paddle-Wheel SBUs upon Hydration

Stability and Hydrolyzation of Metal Organic Frameworks with Paddle-Wheel SBUs upon Hydration

Towards improving wet‐adhesion in a metal oxide‐polymer coating system

Surfactant Gel Extraction of Metal Ammine Complexes using SDS and KCl at Room Temperature, and a Small-angle X-ray Diffraction Study of the Surfactant Phase

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