Adsorption of iron(III)‐cyanide complex ions to granular activated carbon

Aksu, Zümríye; Çalik, A.

doi:10.1080/10934529909376949

Journal of Environmental Science and Health, Part A

1999

DOI: 10.1080/10934529909376949

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Adsorption of iron(III)‐cyanide complex ions to granular activated carbon

Zümríye Aksu¹,

A. Çalik

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Cited by 5 publications

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“…In this case they are held on an adsorbent rather weakly and can be desorbed by solutions of acids or alkalis [43]. We have fulfilled special [43,44]. In the absence of oxygen in a solution the sorption of cyanoferrate ions decreases down to dead stop [43].…”

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confidence: 96%

Study of sorption of platinum and palladium cyanometallate complexes as the key to understanding the mechanism of binding the [Au(CN)2]− anion with carbon adsorbents

Vorob'ev-Desyatovskii¹,

Kubyshkin²,

Ibragimova³

et al. 2012

Russ J Gen Chem

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Goldcarb WSC-207C GR activated carbons with platinum and palladium complexes adsorbed from aqueous solutions of K 2 [Pt(CN) 4 ], K 2 [Pt(CN) 6 ], and K 2 [Pd(CN) 4 ] were studied by the methods of X-ray photoelectron spectroscopy and IR spectroscopy with Fourier transformation, and also by MALDI massspectrometry. Platinum and palladium cyanide complexes are not reduced onto surface of active charcoal while adsorption. A certain part of the [Pd(CN) 4 ] 2-and [Pt(CN) 4 ] 2-anions directly bound to active centers on the activated carbon is oxidized more deeply and functions as particles-anchors, forming oligomers resembling Krogmann salt. A correspondence between the structure of the complex cyanometallate ion and a mode of its binding with active carbon is found. The adsorption of complex species with a linear structure or a square planar structure is defined by a possibility of the formation of donor-acceptor and metallophilic bonds. The mode of the anion [Au(CN) 2 ] -binding with the surface of active carbon was considered.In last 30 years a stable interest arose to the application of activated carbons in hydrometallurgical processes. First of all, it is connected with industrial usage of coals as main adsorbents for extraction of gold(I) from cyanide solutions and pulps. In spite of it the reason of a selective sorption of gold(I) cyanide complex on carbon adsorbents is not yet elucidated at present. Unlike the corresponding complexes of gold, adsorption of platinum and palladium cyanide complexes is by no means studied though the knowledge of specificity of their behavior in relation to carbon adsorbents can present both theoretical and practical interest. This interest is connected, firstly, with the study of mechanisms of binding complexes of noble metals with active carbons and also with the search for methods improving kinetic and capacity properties of carbon adsorbents and increasing their selectivity. Results of such studies promote the improvement of the process of mining and refining platinum metals and gold.Depending on the nature of a central atom and its ligand environment, and also on the composition of a solution and conditions, in which transition metal complexes contact carbon adsorbents, partial or complete reduction of a metal center and (or) chemisorption, which is accompanied by a change in its oxidation state, can occur at the adsorption. To predict a possible result of the interaction between activated carbon and complexes of noble metals, it was suggested to use a comparison of working and stationary potentials of coal in a solution with appropriate redox potentials of complex compounds [1]. The nature of adsorbate at the adsorption of transition metal complex compounds on activated carbons depends on several factors. The composition

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confidence: 96%

Study of sorption of platinum and palladium cyanometallate complexes as the key to understanding the mechanism of binding the [Au(CN)2]− anion with carbon adsorbents

Vorob'ev-Desyatovskii¹,

Kubyshkin²,

Ibragimova³

et al. 2012

Russ J Gen Chem

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A comparative metal ion adsorption study by trimesic acid coated alumina: A potent adsorbent

Saha

Chakraborty

Das

2008

Journal of Colloid and Interface Science

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Removal of Fe(III) ion from aqueous solution by adsorption on raw and treated clinoptilolite samples

Öztaş

Karabakan

Topal

2008

Microporous and Mesoporous Materials

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Adsorption of iron(III)‐cyanide complex ions to granular activated carbon

Cited by 5 publications

References 6 publications

Study of sorption of platinum and palladium cyanometallate complexes as the key to understanding the mechanism of binding the [Au(CN)2]− anion with carbon adsorbents

Study of sorption of platinum and palladium cyanometallate complexes as the key to understanding the mechanism of binding the [Au(CN)2]− anion with carbon adsorbents

A comparative metal ion adsorption study by trimesic acid coated alumina: A potent adsorbent

Removal of Fe(III) ion from aqueous solution by adsorption on raw and treated clinoptilolite samples

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