Preparation of an anion-exchange resin with quaternary phosphonium chloride and its adsorption behaviour for noble metal ions

Fujiwara, Manabu; Matsushita, Takayuki; Kobayashi, Toru; Yamashoji, Yuko; Tanaka, Minoru

doi:10.1016/0003-2670(93)80478-4

Cited by 21 publications

(4 citation statements)

References 8 publications

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“…However, nearly 10−15% of base metals was also adsorbed on the gel beyond 3.0 M HCl concentration. This is probably due to the formation of anionic species of chloro complexes of those metal ions 38 which are adsorbed on the positively charged surface of the adsorbent due to electrostatic interaction. The decrease in adsorption efficiency of BTU-PT gel toward Au(III), Pd(II), and Pt(IV) beyond 3.0 M HCl concentration is attributed to the competitive adsorption of chloride ions.…”

Section: Resultsmentioning

confidence: 99%

Selective Recovery of Precious Metals from Acidic Leach Liquor of Circuit Boards of Spent Mobile Phones Using Chemically Modified Persimmon Tannin Gel

Gurung

Adhikari

Kawakita

et al. 2012

Ind. Eng. Chem. Res.

116

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A tannin-based novel adsorbent, named "BTU-PT gel", was prepared by immobilizing bisthiourea (BTU) ligand on persimmon tannin (PT) extract. The adsorption behaviors of precious metal ions along with other coexisting base metal ions onto BTU-PT gel were studied by batch and continuous column methods. The gel exhibited remarkable selectivity for precious metal ions such as Au(III), Pd(II), and Pt(IV) over base metal ions such as Cu(II), Fe(III), Ni(II), and Zn(II) in 1−5 mol dm −3 hydrochloric acid. The adsorption of precious metal ions on the present gel was found to obey the typical monolayer type of Langmuir model, and the maximum adsorption capacity of the adsorbent was evaluated as 5.18 mol kg −1 for Au(III), 1.80 mol kg −1 for Pd(II), and 0.67 mol kg −1 for Pt(IV). Combination of ion exchange, electrostatic interaction, and coordination through the thiocarbonyl group is the mechanism of adsorption of precious metals on BTU-PT gel. In the case of Au(III) adsorption, the adsorbed species was simultaneously reduced to elemental gold by abundant polyphenolic groups of the tannin matrix. Elution by using acidothiourea solution in continuous column experiment recovered the adsorbed precious metals almost quantitatively. The results of a potential reusability test of the gel for consecutive adsorption and elution cycles by continuous column experiment indicated that the gel was stable and regenerated with undiminished metal uptake capacity up to five cycles. The real time applicability of the adsorbent for the recovery of precious metals from real industrial liquor was evaluated from actual acidic leach liquor of printed circuit boards of spent mobile phones. The gel selectively adsorbed precious metal species but exhibited negligible affinity toward base metals present in the leach liquor. The BTU-PT gel is a potential adsorbent for selective recovery of precious metals from acidic leachate of spent mobile phones containing elevated concentrations of base metals.

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Section: Resultsmentioning

confidence: 99%

Selective Recovery of Precious Metals from Acidic Leach Liquor of Circuit Boards of Spent Mobile Phones Using Chemically Modified Persimmon Tannin Gel

Gurung

Adhikari

Kawakita

et al. 2012

Ind. Eng. Chem. Res.

116

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“…P‐containing sorbents for SPE of Au, Pd, and Pt are still attracting research interest []. Example of a sorbent based on chloromethylated polystyrene with tris‐(2,6‐dimethoxyphenyl)phosphine for selective enrichment of Au(III) and Pt(IV) as their chlorocomplexes is shown on Fig.…”

Section: Sorbentsmentioning

confidence: 99%

Solid‐phase extraction in the determination of gold, palladium, and platinum

Mladenova

Karadjova²,

Tsalev³

2012

J of Separation Science

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A simple classification of various sorbents and solid-phase extraction procedures used for preconcentration of trace levels of Au, Pd, and Pt from different sample types is proposed in this review article. The large variety of available sorbents/procedures has been organized according to expected mechanisms of sorption process (complex formation; ion exchange; adsorption; ion-imprinted or molecularly imprinted polymers); according to the kind of monomeric units of the polymer matrix as well as on the basis of the kind of functional group responsible for main performance characteristics (selectivity, capacity) of the sorbent. Advantages of chemically modified sorbents, sulfur-containing sorbent extractants, and ion-imprinted polymers, together with rational pretreatment by means of microwave treatments, scaling down of enrichment, and quantification by means of flow and flow injection approaches are given. Preferred instrumental techniques for quantification of ppb levels of Au, Pd, and Pt in prepared concentrates/column eluates are multielement instrumental techniques: inductively coupled plasma optical emission spectrometry (ICP-OES), and inductively coupled plasma mass spectrometry (ICPMS). Excellent limits of detection at picogram levels of these analytes are provided by electrothermal atomic absorption spectrometry (ETAAS), generally in single-element mode and the neutron activation analysis (NAA), while X-ray fluorescence spectrometry and flame AAS are rarely applied because of lack of sensitivity at sub-ppm levels of Au, Pd, and Pt. Some problems of atomic spectrometric quantification techniques and their representative limits of detection are given. Recent applications to geological, industrial, pharmaceutical, biological, and other materials are tabulated. References have been selected mostly from the period 1995 to 2010.

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“…The use of anion exchangers for the separation of precious metals from base metals in hydrochloric acid solutions is based on the ability of chloride complexes of precious metals to be retained by strongly basic anion exchangers with groups of quaternary ammonium, phosphonium, pyridinium bases [7][8][9]. Adsorbents with primary, secondary and tertiary amines, depending on the acidity of the medium, can act both as anion exchangers and as complexing adsorbents [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Silicas Chemically Modified with Sulfur-Containing Groups for Separation and Preconcentration of Precious Metals Followed by Spectrometric Determination

et al. 2021

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Silicas chemically modified with a number of sulfur-containing groups (mercaptopropyl, mercaptophenyl, dipropyl disulfide, thiadiazole thiol, dithiocarbamate and thiourea derivatives) were proposed for the separation and preconcentration of precious metals. These adsorbents quantitatively extracted precious metals from 0.5 to 4 M solutions of hydrochloric acid. It allowed their separation from high concentrations of non-ferrous, alkaline earth, alkali and some other related metals. The selectivity of separation of kinetically labile precious metal ions in ligand substitution reactions from kinetically inert ones depended on the nature of sulfur atom within the functional group of adsorbents and increased when passing from thione to thiol sulfur. Approaches for the preconcentration of precious metals using silicas chemically modified with sulfur-containing groups prior to their AAS, ICP-OES, and ICP-MS determination in ores, concentrates and their processing products were proposed. The correctness of the developed methods was confirmed by the analysis of certified reference materials.

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Preparation of an anion-exchange resin with quaternary phosphonium chloride and its adsorption behaviour for noble metal ions

Cited by 21 publications

References 8 publications

Selective Recovery of Precious Metals from Acidic Leach Liquor of Circuit Boards of Spent Mobile Phones Using Chemically Modified Persimmon Tannin Gel

Selective Recovery of Precious Metals from Acidic Leach Liquor of Circuit Boards of Spent Mobile Phones Using Chemically Modified Persimmon Tannin Gel

Solid‐phase extraction in the determination of gold, palladium, and platinum

Silicas Chemically Modified with Sulfur-Containing Groups for Separation and Preconcentration of Precious Metals Followed by Spectrometric Determination

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