Separation of concentrated platinum(IV) and rhodium(III) in acidic chloride solution via liquid–liquid extraction using tri-octylamine

Jaree, Attasak; Khunphakdee, Nuttakhun

doi:10.1016/j.jiec.2011.02.013

Cited by 41 publications

(16 citation statements)

References 16 publications

(18 reference statements)

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“…The occurrence of a competition between PdCl4 2− and Cl− according to eqn (6) Taking into account the high values for the distribution coefficients of Pd(II) and the major influence of the concentration of HCl on the extraction of Rh(III) towards ionic liquids, separation of these two metals using ionic liquids was investigated. Values for the distribution coefficients and the separation factors are collected in Table 3.…”

Section: Resultsmentioning

confidence: 99%

“…In order to study the separation of Rh(III) and Pd(II) under similar conditions, a first set of solutions using the same concentration for both metals (250 mg L−1) was prepared dissolving K3RhCl6 and Na2PdCl4 together in 1, 6 or 8 M HCl accordingly. Taking into account that the mass of rhodium in a spent catalyst is generally 3 to 10 times smaller than that of palladium, a second set of solutions containing 50 mg L−1 Rh(III) and 250 mg L−1 Pd(II) was also prepared in 1, 6 Experiments were carried out in a way similar to that detailed in the preceding section (i.e. same contact time, same separation and analytical procedure).…”

Section: Separation Of Rh(iii) and Pd(ii)mentioning

confidence: 99%

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Quantitative extraction of Rh(iii) using ionic liquids and its simple separation from Pd(ii)

2016

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The extraction of Pd(ii) and Rh(iii) from acidic solutions containing between 1 and 8 M HCl towards three ionic liquids, namely [P][Cl], [P][Br] and [P][DCA], based on the trihexyltetradecylphosphonium cation ([P]) and chloride, bromide or dicyanamide (DCA) anions, respectively, is reported. Extraction of Pd(ii) is quantitative up to 6 M HCl (D > 3000). A value of 258 for the distribution coefficient of Rh(iii) extracted from 1 M HCl towards [P][Br] is also reported. [P][Cl] and [P][Br] were found to be very efficient at separating these two metals from aqueous solutions containing at least 6 mol L HCl.

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Section: Resultsmentioning

confidence: 99%

Section: Separation Of Rh(iii) and Pd(ii)mentioning

confidence: 99%

Quantitative extraction of Rh(iii) using ionic liquids and its simple separation from Pd(ii)

2016

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“…The many methods for the recovery of platinum and platinum group metals from aqueous solutions include precipitation, coprecipitation, liquid–liquid extraction, and adsorption. Among these methods, adsorption technology has proven to be economical and efficient …”

Section: Introductionmentioning

confidence: 99%

Adsorption of platinum(IV) from an aqueous solution with magnetic cellulose functionalized with thiol and amine as a nano‐active adsorbent

Anbia

Rahimi

2017

J of Applied Polymer Sci

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In this study, magnetic cellulose was prepared and then functionalized by the grafting of glycidyl methacrylate and reaction with thiourea/amine [to produce grafted magnetic cellulose with thiol/amine (GMC-N/S)]. Thus, GMC-N/S as a nano-active adsorbent was investigated for the adsorption of Pt(IV) in a batch system. A response surface methodology was used to study the effects of four independent variables [Pt(IV) concentration, temperature, pH of the solution, and adsorbent dose] and to optimize the process conditions for the maximum adsorption of platinum(IV) from aqueous solutions by GMC-N/S. A high coefficient of determination (R 2 5 98.46) implied the adsorption of Pt(IV) onto the adsorbent in a valid manner, and only 1.54% of the total variable was not explained by the model. The equilibrium adsorption data were fitted to the Langmuir isotherm. The maximum monolayer adsorption capacity of the adsorbent (GMC-N/S) for Pt(IV) was determined to be 40.48 mg/g. V C 2017 Wiley Periodicals, Inc. J.Appl. Polym. Sci. 2017, 134, 45361.

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“…In automobile catalysts, Pt and/or Pd are used to oxidize carbon monoxide and hydrocarbons, while Rh is used to reduce nitrogen oxides to nitrogen. 1) No substitute for Rh in the control of NO x emissions has yet been found.…”

Section: Introductionmentioning

confidence: 99%

“…1,611) One of the main properties of PGMs is their ability to form complexes with chloride ions in solution. The distribution of PGM species in aqueous solution is highly dependent on the acidity and chloride concentration.…”

Section: Introductionmentioning

confidence: 99%

Separation of Platinum(IV) and Rhodium(III) from Hydrochloric Acid Solutions Using Diaion Resins

et al. 2015

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Pt and Rh in HCl solutions were separated by adsorption with strong basic resins (Diaion SA10A, Diaion SA20A, and Diaion PA308) in the HCl concentration range 0.15 mol/dm 3 . The molar ratio of Pt to Rh in the feed solution was fixed at 5 : 1, based on the composition of spent automobile catalysts. The resins used had selectivity for Pt over Rh, and the adsorptions of both metals were clearly affected by the acid concentration. Batch experiments indicated that it is possible to separate Pt from Rh at low acid concentrations with these resins; Diaion SA10A was the most effective. The feasibility of separation of Pt and Rh with Diaion SA10A was verified using continuous column experiments. The loaded Diaion SA10A resin was regenerated by elution with a mixture of HCl and thiourea.

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Separation of concentrated platinum(IV) and rhodium(III) in acidic chloride solution via liquid–liquid extraction using tri-octylamine

Cited by 41 publications

References 16 publications

Quantitative extraction of Rh(iii) using ionic liquids and its simple separation from Pd(ii)

Quantitative extraction of Rh(iii) using ionic liquids and its simple separation from Pd(ii)

Adsorption of platinum(IV) from an aqueous solution with magnetic cellulose functionalized with thiol and amine as a nano‐active adsorbent

Separation of Platinum(IV) and Rhodium(III) from Hydrochloric Acid Solutions Using Diaion Resins

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