Extraction Equilibrium of Precious Metals from Aqueous Acidic Solutions Using Divinylbenzene Homopolymeric Microcapsules Encapsulating Ternary Amine as a Core Material

Shiomori, Koichiro; Yoshizawa, Hidekazu; Fujikubo, Kenji; Kawano, Yoshinobu; Hatate, Yasuo; Kitamura, Yoshiro

doi:10.1081/ss-120024719

Cited by 20 publications

(10 citation statements)

References 27 publications

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“…The plot of The theoretical maximum quantity of Zn(II) extraction, q t , corresponds to half the value of E' as shown in Eq. (9). The ratio of q max to q t , which is defined as the loading ratio, L, was calculated using Eq.…”

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confidence: 99%

Preparation of Microcapsules Containing PC-88A with Interconnected Spherical Pores and Their Extraction Properties for Zn(II)

Matsushita

Sana

Kiyoyama

et al. 2011

SERDJ

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2-Ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC-88A), which is an effective extractant of Zn(II), was microencapsulated by in situ polymerization in a W/O/W emulsion system. Divinylbenzene was used as the wall material and polymerized in the organic phase by free radical polymerization. Microcapsules with large interconnected-spherical pores were successfully prepared. The pore size and the diameter of the microcapsules increased with increasing NaCl concentration in the inner aqueous phase. The diameter of the microcapsules was almost constant at around 230 μm and was independent of the concentration of PC-88A in the organic phase. The entrapment efficiency of PC-88A in the microcapsules was higher than 80% for all preparation conditions. The extraction of Zn(II) using the microcapsules containing PC-88A sharply increased at pH values greater than 2. Zn(II) extracted in the microcapsules was successfully back-extracted at pH values less than 2. It was confirmed that two molecules of PC-88A reacted with one Zn(II) ion by quantitative analysis of the relationship between the maximum amounts of Zn(II) extracted and the amount of PC-88A encapsulated in the microcapsules. The extraction rate of Zn (II) was accelerated by the formation of interconnected-spherical pores inside the microcapsules.

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Section: ( )mentioning

confidence: 99%

Preparation of Microcapsules Containing PC-88A with Interconnected Spherical Pores and Their Extraction Properties for Zn(II)

Matsushita

Sana

Kiyoyama

et al. 2011

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“…In other work, Nishihama et al studied the separation and recovery of Cr(VI) from simulated plating waste using microcapsules containing a quaternary ammonium salt and a phosphoric acid as extractants 12 . The same methodology was used by Shiomori et al in an extraction equilibrium study of precious metals from aqueous acidic solutions using microspheres constituted by a divinylbenzene polymeric matrix and a ternary amine-type extractant 13 . In a previous report, we studied the removal of Cd(II) and Cu(II) from aqueous solutions by sorption onto microcapsules prepared by copolymerizing ethylene glycol dimethacrylate and styrene 14 .…”

Section: Introductionmentioning

confidence: 99%

MICROENCAPSULATION OF TRIOCTYLAMINE IN POLYMERIC MATRICES FOR REMOVING Zn(II) AND Cu(II) FROM CHLORIDE AQUEOUS SOLUTIONS

Fonseca

Araneda

Yazdani‐Pedram

et al. 2010

J. Chil. Chem. Soc.

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The microencapsulation of the non-specific basic extractant trioctylamine in polymeric matrices synthesized from styrene and divinylbenzene was studied. The microcapsules were prepared by adding the amine compound during in situ free radical suspension polymerization using benzoyl peroxide as the initiator and using variable proportions of both monomers. SEM analysis shows that the microcapsules have a spherical shape presenting an average surface area of 480 m 2 g -1 and a pore size around 0.5 to 1.8 nm. Synthesis of the microspheres was affected by the amount of extractant used and by the proportion of both monomers during their preparation.The obtained microcapsules were used for the sorptive removal of Zn(II) and Cu(II) ions from chloride aqueous solutions, reaching extraction extents near 90% under the best conditions, following an anion-exchange mechanism between the metallic ions and the extractant immobilized onto the microcapsules. Zn(II) and Cu(II) sorption kinetics experiments were performed and efficient uptake of both metals within a few minutes was measured. The experimental results were explained using a pseudo-second-order rate kinetics model, which fit the results of chemisorption of both metals onto the microcapsules well.

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“…To solve these problems, the immobilization of the extractant [2][3][4][5][6][7][8] and microencapsulation [9][10][11][12][13][14][15][16][17][18][19][20][21][22] of the extractant have been investigated. The immobilization of the extractant is achieved using porous polymer particles [2][3][4][5][6] and in some cases using fibers [7,8].…”

Section: Introductionmentioning

confidence: 99%

Extraction Properties of Nickel (II) with Polymeric Particles with Interconnected Spherical Pores Impregnating with LIX84-I

Kitabayashi

Sana

Kiyoyama

et al. 2013

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1-(2-hydroxyl-5-nonyphenyl)ethanone oxime (LIX84-I) was impregnated intopolymeric particles with interconnected spherical pores by the solvent evaporation method. Divinylbenzene was used as a wall material and polymerized in the organic phase of a (W/O/W) emulsion by free radical polymerization. The diameter of the polymeric particles was almost constant at around 208±26μm. The impregnated yield of LIX84-I in the polymeric particles was higher than 80% in all preparation conditions. The extraction of Ni(II) with the polymeric particles impregnated with LIX84-I sharply increased at pH values higher than 6. It is confirmed that three molecules of LIX84-I reacted with one Ni(II) ion by quantitative analysis of the relationship between the maximum amounts of Ni(II) extracted and the amount of LIX84-I impregnated in the polymeric particles. The extraction rate of Ni(II) was effectively accelerated by the presence of the interconnected-spherical pores in the inside of the polymeric particles.

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Extraction Equilibrium of Precious Metals from Aqueous Acidic Solutions Using Divinylbenzene Homopolymeric Microcapsules Encapsulating Ternary Amine as a Core Material

Cited by 20 publications

References 27 publications

Preparation of Microcapsules Containing PC-88A with Interconnected Spherical Pores and Their Extraction Properties for Zn(II)

Preparation of Microcapsules Containing PC-88A with Interconnected Spherical Pores and Their Extraction Properties for Zn(II)

MICROENCAPSULATION OF TRIOCTYLAMINE IN POLYMERIC MATRICES FOR REMOVING Zn(II) AND Cu(II) FROM CHLORIDE AQUEOUS SOLUTIONS

Extraction Properties of Nickel (II) with Polymeric Particles with Interconnected Spherical Pores Impregnating with LIX84-I

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