Solvent Extraction Studies of Zinc(II) and Cadmium(II) from a Chloride Medium with Mixtures of Neutral Organophosphorus Extractants and Amine Extractants

Abstract

In the present study, the extraction of zinc(II) and cadmium(II) with mixtures of neutral organophosphorus extractants (aliphatic trialkyl phosphine oxide, Cyanex 923, or branched cyclic trialkyl phosphine oxide, Cyanex 925) and amine extractants (N,N-di(1-methylheptyl) acetamide, N503, or trialkyl amine, N235) has been investigated. Synergistic effects were observed for zinc(II) with Cyanex 923 þ N503 and for cadmium(II) with Cyanex 923 þ N235 and Cyanex 925 þ N235. However, the other mixing systems do not have synergistic effects on zinc(II) and cadmium(II). According to the different extraction effects, the separation possibilities of zinc(II) and cadmium(II) are discussed. The extraction mechanisms have been studied with the methods of slope analysis and constant moles in the three synergistic systems. The extracted compounds, the equilibrium constants, and thermodynamic functions have also been determined.

Solvent Extraction Method for Separation and Determination of Zn (||) by Using of Imidazole Derivative

“…Aqueous solutions 5mL in volume contain 50µg Zn 2+ and different pH at the range (4)(5)(6)(7)(8)(9)(10)(11) , then added to each solution 5mL of organic reagent solution MPADPI dissolved in chloroform at 1x10 -4 and then shaking these solution for 10 minute afterward separation organic phase from aqueous phase ,then measure the absorbance of the organic phase at λmax=535nm against blank prepared at the same manner without Zn 2+ ,but the aqueous phase treated according to dithizone method and return to calibration curve to determined Distribution ratio D at each pH value the results were as in Figures 3,4: The result demonstrate pH=10 was the optimum value which is giving higher extraction efficiency because at this pH giving best binding between organic reagent MPADPI with Zn 2+ ion and more stable, any pH less than optimum value it is not suitable for formation complex, so pH value more than optimum give decline in extraction efficiency and complex formation by effect increasing OHion in aqueous solution which is prevent the complex formation.…”

“…Gharabaghi and others (2013) by application solvent extraction extracted Ni and Zn from acidic solution by Di(2-ethylhexyl) phosphoric acid (Cyanex272),and pinpointed the optimum condition and application this method to extracted and determined these ions from waste water [3] . There was many application for solvent extraction to separation and determination metal elements as cations or as anions and applicable their methods for determination these elements in different samples after determination optimum condition [4][5][6][7][8][9][10] .And in preferential research involved separation and extraction Lanthanum(III) by joined cloud point with salvation [11] .By application Onium method for separation and spectrophotometric determination of Co(II) joined with cloud point extraction methodology [12] . Extracted many metal ions by solvent extraction methods [13][14][15][16][17][18][19] .…”

Environmental separation and enrichment of gold and palladium ions by amino-modified three-dimensional graphene

“…Precious metals (Ag, Au, Ru, Rh, Pd, Os, Ir, Pt) have excellent corrosion resistance and highly stable chemical properties and are therefore widely used in various elds including agriculture, biomedicine, jewellery, catalysis, and electronic industries. 1 To date, various methods are available for their separation and extraction such as ion exchange, 2 coprecipitation, re assay, solvent extraction, 3,4 liquid membrane separation, and adsorbent separation, 5 among others. In the past, most of the resin used as a matrix, and resin molecules [6][7][8] were functionalized with chemical groups able to increase their adsorption capacity for precious metals.…”

Zinc and iron removal from chromium(III) passivation baths by solvent extraction with Cyanex 272

“…Since zinc is mostly presented in the aqueous solutions generated from these recovery processes as Zn 2+ , the extractants used to extract the cation are, naturally, acidic or cationic reagents, and among them, alkylphosphorus derivatives are often used [1][2][3][4][5][6][7]. As in all general rules, and despite the earlier, there are exceptions and in the case of zinc(II) this occurs in the treatment of spent pickling solutions, in which, basic or solvation reagents had been proposed as extractants for the various neutral species and anionic zinc(II)-chloride complexes [8][9][10], whereas more recently, ionic liquids had been introduced as potential zinc extractants from this chloride and other aqueous media [11][12][13][14][15][16].…”