Transition Metal Cyanides and Their Complexes

Chadwick, B. M.; Sharpe, A. G.

doi:10.1016/s0065-2792(08)60201-0

Cited by 128 publications

(63 citation statements)

References 436 publications

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“…Tlie reactions of ei,,-with the cyanides of Fe(II), Ru(l I), Os(lI), and Mo(1V) are relatively slow processes (2, 1 I) so that the decay of e,,-in aerated media will involve principally reaction 2 [21 e.,-+ O 2 -> 0,- (or HOz) while in sat~irated nitrous oxide sol~itions its decay will be via reaction 3 to give O H radical (1,3).…”

Section: Resultsmentioning

confidence: 99%

Oxidation of Some Transition-Metal Cyanide Compounds by Hydroxyl Radical

Waltz¹,

Akhtar²,

Eager³

1973

Can. J. Chem.

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The oxidation of some transition-metal cyanide compounds by hydroxyl radical in aqueous media has been investigated by pulse radiolysis. For compounds of the type, M(CN)64-where M is Fe, Ru, and Os, and for Mo(CN)s4-, the mechanism of their reaction with hydroxyl radical involves single electron transfer with the formationofthe intensely colored metalcomplexes of the same stoichiometry as the startingmaterials. The u.v.-visible absorption spectra for these products for the iron, ruthenium, and osmium systems are reported along with the associated second order rate constants for their formation. The reaction of Mo(CN)s4-with hydroxyl radical has been studied by a competition technique using sodium bicarbonate. The values of the second order rate constants are near those expected of diffusion-controlled reactions and they range between cn. 5 x lo9 to I x 101° M-I s-l. Can.

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Section: Resultsmentioning

confidence: 99%

Oxidation of Some Transition-Metal Cyanide Compounds by Hydroxyl Radical

Waltz¹,

Akhtar²,

Eager³

1973

Can. J. Chem.

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“…This was found to be optimal, irrespective of the FeCl 3 concentration. Figure 1A shows typical scanning electron microscope (SEM) images of the pristine diatomite Prussian blue is typically specified as either "soluble" or "insoluble" [11]. This distinction is related to the presence or absence of an alkaline moiety (denoted as A'; in this study, A' = Na) in the structural formula.…”

Section: Caging Prussian Bluementioning

confidence: 99%

Prussian blue caged in spongiform adsorbents using diatomite and carbon nanotubes for elimination of cesium

Fugetsu

et al. 2012

Journal of Hazardous Materials

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We developed a spongiform adsorbent that contains Prussian blue, which showed a high capacity for eliminating cesium. An in situ synthesizing approach was used to synthesize Prussian blue inside diatomite cavities. Highly dispersed carbon nanotubes (CNTs) were used to form CNT networks that coated the diatomite to seal in the Prussian blue particles. These ternary (CNT/diatomite/Prussian-blue) composites were mixed with polyurethane (PU) prepolymers to produce a quaternary (PU/CNT/diatomite/Prussian-blue), spongiform adsorbent with an in situ foaming procedure. Prussian blue was permanently immobilized in the cell walls of the spongiform matrix and preferentially adsorbed cesium with a theoretical capacity of 168 mg/g cesium. Cesium was absorbed primarily by an ion-exchange mechanism, and the absorption was accomplished by self-uptake of radioactive water by the quaternary spongiform adsorbent

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“…In the presence of cyanide, many metals and metalloids (such as Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ge, Mo, Tc Ru, Rh, Pd, Ag, Cd, W, Re, Os, Ir, Pt, Au, Hg, Tl, Po, and U) form well-defined cyanides complexes which show often very good water solubility and exhibit high chemical stability (Ford-Smith, 1964;Chadwick and Sharpe, 1966). This principle is industrially used mainly in mining operations where gold from low-grade ores is converted to a water-soluble compound by adding cyanide "from the bottle".…”

Section: Introductionmentioning

confidence: 99%

Biomobilization of silver, gold, and platinum from solid waste materials by HCN-forming microorganisms

et al. 2008

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Biomobilization of silver, gold, and platinum from solid waste materials by HCN-forming microorganisms Biomobilization of silver, gold, and platinum from solid waste materials by HCN-forming microorganisms Abstract Cyanogenic Chromobacterium violaceum, Pseudomonas fluorescens, and P. plecoglossicida were able to mobilize silver, gold, and platinum when grown in the presence of various metalcontaining solids such as gold-containing electronic scrap, silver-containing jewelry waste, or platinum-containing automobile catalytic converters. Five percent of silver was microbially mobilized from powdered jewelry waste as dicyanoargentate after one day, although complete dissolution was obtained when non-biological cyanide leaching was applied. Dicyanoargentate inhibited growth at concentrations of >20 mg/L. Gold was bacterially solubilized from shredded printed circuit boards. Maximum dicyanoaurate concentration corresponded to 68.5% dissolution of the total gold added. Additionally, cyanide-complexed copper was detected during treatment of electronic scrap due to its high copper content of approximately 100 g/kg scrap. However, only small amounts of platinum (0.2%) were mobilized from spent automobile catalytic converter after 10 days probably due to passivation of the surface by an oxide film. In summary, all findings demonstrate the potential of microbial mobilization of metals as cyanide complex from solid materials and represent a novel type of microbial metal mobilization (termed "biocyanidation") which might find industrial application. ABSTRACT Cyanogenic Chromobacterium violaceum, Pseudomonas fluorescens, and P. plecoglossicida were able to mobilize silver, gold, and platinum when grown in the presence of various metalcontaining solids such as gold-containing electronic scrap, silver-containing jewelry waste, or platinum-containing automobile catalytic converters. Five percent of silver was microbially mobilized from powdered jewelry waste as dicyanoargentate after one day, although complete dissolution was obtained when non-biological cyanide leaching was applied. Dicyanoargentate inhibited growth at concentrations of >20 mg/L. Gold was bacterially solubilized from shredded printed circuit boards. Maximum dicyanoaurate concentration corresponded to 68.5% dissolution of the total gold added. Additionally, cyanide-complexed copper was detected during treatment of electronic scrap due to its high copper content of approximately 100 g/kg scrap. However, only small amounts of platinum (0.2%) were mobilized from spent automobile catalytic converter after 10 days probably due to passivation of the surface by an oxide film. In summary, all findings demonstrate the potential of microbial mobilization of metals as cyanide complex from solid materials and represent a novel type of microbial metal mobilization (termed "biocyanidation") which might find industrial application. Biomobilization of silver, gold, and platinum from solid waste materials by HCN-forming microorganisms

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Transition Metal Cyanides and Their Complexes

Cited by 128 publications

References 436 publications

Oxidation of Some Transition-Metal Cyanide Compounds by Hydroxyl Radical

Oxidation of Some Transition-Metal Cyanide Compounds by Hydroxyl Radical

Prussian blue caged in spongiform adsorbents using diatomite and carbon nanotubes for elimination of cesium

Biomobilization of silver, gold, and platinum from solid waste materials by HCN-forming microorganisms

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