An electroactive ion exchange hybrid film with collaboratively-driven ability for electrochemically-mediated selective extraction of chloride ions

2021 ◽  
pp. 130807
Author(s):  
Wangwang Ji ◽  
Junjian Niu ◽  
Wei Zhang ◽  
Xuan Li ◽  
Wenjun Yan ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Hybrid Film ◽  
Selective Extraction ◽  
Chloride Ions

Selectivity coefficients of some simple and complex inorganic ions for Spheron DEAE

1984 ◽  
Vol 49 (10) ◽  
pp. 2349-2354 ◽  
Author(s):  
František Vláčil ◽  
Karel Koňák
Keyword(s):  
Ion Exchange ◽  
Mobile Phase ◽  
Dynamic Method ◽  
Precious Metals ◽  
Inorganic Ions ◽  
Chromatographic Determination ◽  
Chloride Ions ◽  
Chloro Complexes ◽  
Selectivity Coefficients

The selectivity coefficients of the nitrate and chloride ions and of anionic chloro complexes of Au(III), Rh(III), Pd(II), and Pt(IV) for ion exchange on Spheron DEAE in the chloride form are determined by the dynamic method. the complex anion species formed are identified and the ion exchange nature of the sorption of precious metals on this sorbent is confirmed based on the elution order of the precious metals as determined previously by the column chromatography on Spheron DEAE using hydrochloric acid as the mobile phase. The effect of the presence of perchlorate in the mobile phase during the liquid chromatography of precious metals and during the chromatographic determination of nitrate traces is explained.

Experimental Study on Chloride Diffusion, Strength and Fresh Properties of Ion-Exchange Resin Mixed Grout

2016 ◽  
Vol 711 ◽  
pp. 436-443
Author(s):  
Osamu Sanada ◽  
Hiroshi Mutsuyoshi ◽  
Luan Yao ◽  
Atsushi Sumida
Keyword(s):  
Ion Exchange ◽  
Prestressed Concrete ◽  
Exchange Resin ◽  
Chloride Ion ◽  
Ion Exchange Resin ◽  
Chloride Ions ◽  
Concrete Bridges ◽  
Chloride Diffusion ◽  
Chloride Attack ◽  
Increased Strength

In Japan, a number of existing prestressed concrete bridges are suffering chloride attack. Especially in the cases that bridges were constructed decades ago, grouts tending to bleed or swell were often used, and the grouting was not well done. As a result, ducts were not completely filled and voids remained. For the incompletely grouted zones, tendons were vulnerable and more severely corroded. To repair those bridges, effective and economic regrouting materials and method are requisite. Recently, a new repair grout has been developed in the authors’ group by mixing ion-exchange resin, a widely used polymer in water purification, into cement paste. Since IER can absorb chloride ions, IER mixed grout is promising to remove free chloride ions in the unfilled duct. In this study, the chloride ion diffusion properties of IER mixed grout was investigated experimentally. Tendons, which were preliminarily spread at the surface with chloride, were grouted using the IER mixed grout. After curing, the chloride amount in the grout was analyzed using potentiometric titration against silver nitrate. It was confirmed that IER effectively absorbed chloride ions from the surface of tendon, and thus is promising to alleviate the corrosion. Furthermore, to promote the practical use, other properties of the grout, such as strength, flowability and bleeding ratio, were test. It is found that as IER ratio increased strength and flowability tended to decrease but bleeding did not occur. When mix proportion and addition ratio of IER were adopted properly, those properties satisfied the acceptance criterias in design code.

scholarly journals Selective Extraction of Cobalt and Copper from Chilean Mine Water by Ion Exchange Resin

2020 ◽  
Vol 5 (1) ◽  
pp. 25-29
Author(s):  
J. Abeywickrama ◽  
N. Hoth ◽  
M. Ussath ◽  
C. Drebenstedt
Keyword(s):  
Ion Exchange ◽  
Mine Water ◽  
Exchange Resin ◽  
Selective Extraction ◽  
Ion Exchange Resin

A potential-responsive affinity-controlling 2-2′-dithiodibenzoic acid/polyaniline hybrid film with high ion exchange capability and selectivity to cadmium ions

2019 ◽  
Vol 319 ◽  
pp. 615-624 ◽  
Author(s):  
Zhongde Wang ◽  
Juan Du ◽  
Wenjun Yan ◽  
Wei Zhang ◽  
Junjian Niu ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Hybrid Film ◽  
Cadmium Ions

scholarly journals Recovery of Pure Pd(II) from Spent Electroplating Solutions by Solvent Extraction with Ionic Liquids from Sulfuric Acid Leaching Solution of Cemented Pd

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1320
Author(s):  
Viet-NhanHoa Nguyen ◽  
Si-Jeong Song ◽  
Man-Seung Lee
Keyword(s):  
Ionic Liquids ◽  
Sulfuric Acid ◽  
Solvent Extraction ◽  
Acid Leaching ◽  
Selective Extraction ◽  
Complete Separation ◽  
Chloride Ions ◽  
Sulfuric Acid Leaching ◽  
H2so4 Concentration ◽  
Separation Conditions

Palladium (Pd) electroplating is widely practiced in the manufacture of advanced electronic devices. The Pd(II) present in spent electroplating solutions is treated by cementation with zinc (Zn) metal powder. In order to recover pure Pd from the cemented Pd, a process that consisted of leaching followed by solvent extraction was investigated. For this purpose, solvent extraction experiments using synthesized ionic liquids (ILs) with organic and inorganic anions were performed to find separation conditions at which selective extraction of Pd(II) over Zn(II) from synthetic H2SO4 leaching solutions is possible. The concentration of sulfuric acid was varied from 0.5 to 9 M. The complete separation of Pd(II) over Zn(II) by ILs such as ALi–CY301 (N-methyl-N,N,N-trioctylammonium bis(2,4,4-trimethylpentyl) dithiophosphinic), ALi–SCN (N-methyl-N,N,N-trioctylammonium thiocyanate), ALi–I (N-methyl-N,N,N-trioctylammonium iodide) and ALi–Br (N-methyl-N,N,N-trioctylammonium bromide) depends on H2SO4 concentration, while ALi–LIX63 (N-methyl-N,N,N-trioctylammonium 5,8-diethyl-7-hydroxydodecane-6-oxime) and ALi–LIX84 (N-methyl-N,N,N-trioctylammonium 2-hydroxy-5-nonylacetophenone oxime) can completely separate Pd(II) irrespective of H2SO4 concentration. Additionally, the mixture of HCl and thiourea, aqua regia solution, NH3 solution and the mixture of NH4Cl and NH3 are powerful stripping agents for Pd(II) from the loaded ALi–LIX63/ALi–LIX84, ALi–CY301, ALi–Br/ALi–I and ALi–SCN, respectively. However, application of the separation conditions to the real 5 M sulfuric acid leaching solutions of cemented Pd indicated that it was difficult to separate the two ions by extraction with ALi–LIX63 and ALi–LIX84. Use of NaClO as an oxidizing agent during the sulfuric acid leaching of real cemented Pd resulted in an enhancement of Zn(II) extraction by ALi–LIX63 and ALi–LIX84. Therefore, removal of chloride ions from the sulfuric acid leaching solutions is necessary to apply the separation conditions obtained from synthetic sulfuric acid leaching solutions.

scholarly journals Selective Extraction of Rare Earth Elements from Phosphoric Acid by Ion Exchange Resins

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 682 ◽  
Author(s):  
Xavier Hérès ◽  
Vincent Blet ◽  
Patricia Di Natale ◽  
Abla Ouaattou ◽  
Hamid Mazouz ◽  
...  
Keyword(s):  
Rare Earth ◽  
Ion Exchange ◽  
Phosphoric Acid ◽  
Rare Earth Elements ◽  
Moving Boundary ◽  
Cost Effective ◽  
Selective Extraction ◽  
Ion Exchange Resins ◽  
Maximum Sorption Capacity ◽  
Exchange Resins

Rare earth elements (REE) are present at low concentrations (hundreds of ppm) in phosphoric acid solutions produced by the leaching of phosphate ores by sulfuric acid. The strongly acidic and complexing nature of this medium, as well as the presence of metallic impurities (including iron and uranium), require the development of a particularly cost effective process for the selective recovery of REE. Compared to the classical but costly solvent extraction, liquid-solid extraction using commercial chelating ion exchange resins could be an interesting alternative. Among the different resins tested in this paper (Tulsion CH-93, Purolite S940, Amberlite IRC-747, Lewatit TP-260, Lewatit VP OC 1026, Monophos, Diphonix,) the aminophosphonic IRC-747, and aminomethylphosphonic TP-260 are the most promising. Both of them present similar performances in terms of maximum sorption capacity estimated to be 1.8 meq/g dry resin and in adsorption kinetics, which appears to be best explained by a moving boundary model controlled by particle diffusion.

Selective extraction of benzoic acid from landfill leachate by solid-phase extraction and ion-exchange chromatography

2004 ◽  
Vol 1027 (1-2) ◽  
pp. 167-170 ◽  
Author(s):  
Irajá do Nascimento Filho ◽  
Patricia Schossler ◽  
Lisiane Santos Freitas ◽  
Maria Inês S Melecchi ◽  
Maria Goreti Rodrigues Vale ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Benzoic Acid ◽  
Solid Phase Extraction ◽  
Landfill Leachate ◽  
Solid Phase ◽  
Selective Extraction ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Phase Extraction

scholarly journals COMPOSITE MATERIALS BASED ON HYDROGEN DIOXIDE WITH CIRCONIA FOR THE DISPOSAL OF ANIONES Cr(VI) AND F(I) FROM WATER SOLUTIONS

2019 ◽  
Vol 85 (3) ◽  
pp. 35-48
Author(s):  
Aleksandra Rudenko
Keyword(s):  
Ion Exchange ◽  
Polymeric Materials ◽  
Selective Extraction ◽  
Organic Polymer ◽  
Inorganic Membranes ◽  
Ion Exchangers ◽  
Separation Processes ◽  
Environmental Objects ◽  
Charge Selectivity ◽  
Living Organisms

The review is devoted to the problem of technogenic pollutionof awater environment bytoxic compounds, in particular, anionic compounds Cr(VI) and F(I), as well as technical and scientific ways to solve the problem. The sources of chromium and fluoride compounds entering the environment, their significance for the vital activity of living organisms, including the effect on human health, are considered.The content of chromium and fluorine compounds in various environmental objects was analyzed; special attention was paid to the concentration of these compounds in various water objects (rivers, seas, lakes, groundwater, drinking water, etc.). Fromexistingmethodsfor removing compounds of fluorine and chromium from aqueous solutions а reagent treatment, mutual neutralization, biological, ion exchange and membrane methodsare reviewed. The prospects of methods of electro-membrane technology are considered: electrodialysis, membrane electrolysis, as well as electrodeionization, which combines ion exchange and electrodialysis.The widespread use of these processes is restrained, first of all, by the low chemical and thermal stability of organic polymer membranes and their propensity to accumulate organic impurities. In addition, strongly acidic ion exchangers and membranes that are charge-selective do not exhibit selectivity with respect to certain ions. At the same time, for even better known inorganic membranes, even the charge selectivity is not inherent, which makes it difficult to use them in electromembrane separation processes. Inorganic membranes and granulated ion exchangers on the basis of selective oxide compounds characterized by sufficiently high chemical stability compared with polymeric materials, as well as the selectivity of the absorption of certain ions, are considered as promising for selective electromembrane extraction of anionic compounds Cr(VI) and F(I). It is shown that the perspective direction in the development of modern methods of separation and selective extraction of anions Cr(VI), F(I) is the development of composite selective membranes and ion exchange sorbents that combine the advantages of both a chemically stable inorganic matrix and selective ion exchangers based on the corresponding compounds.

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