Taiga Kawamura, T. Kudo, T. Ito, Hao Wu, Seongyun Kim
Silica-based adsorbents impregnated tetra-n-butyl thiuram disulfide (TBTDS) or tetrakis (2-ethylhexyl) thiuram disulfide (T(2EH)TDS) as extractants on a macroporous silica/polymer composite support (SiO2-P) were prepared to separate barium (Ba) ions from strontium (Sr) ions present in mixed solutions. The Ba and Sr ion adsorption behaviors of each adsorbent were investigating by varying acid concentration, contact time, temperature, and metal concentrations in solution using the batch method. The Ba and Sr adsorption affinities depended on nitric acid concentration, and the difference in distribution coefficient (Kd) between the two ions was maximum in 1 M HNO3. Furthermore, results indicated that the adsorption reaction starts several hours after the initial solution–adsorbent contact and reaches equilibrium within 4–10 hours. The dependence for thermal for adsorption indicated to be spontaneous processes. The adsorption mechanisms were investigated by applying two isotherm models. The shapes of the isotherms were different between the TBTDS adsorbent and the T(2EH)TDS adsorbents. The isotherm for the two T(2EH)TDS adsorbents were well fitted by the Langmuir model, but that for TBTDS was S-shaped and more metal ions were adsorbed than the other adsorbents. These results suggest that the Ba and Sr ions could be separated from each other via the batch method using these adsorbents.
在大孔二氧化硅/聚合物复合载体(SiO2-P)上制备了浸渍四正丁基硫脲(TBTDS)或四烷基(2-乙基己基)硫脲(T(2EH)TDS)作为萃取剂的硅基吸附剂，用于分离混合溶液中的钡(Ba)离子和锶(Sr)离子。采用间歇法研究了不同酸浓度、接触时间、温度和溶液中金属浓度对各吸附剂Ba和Sr离子的吸附行为。Ba和Sr的吸附亲和度与硝酸浓度有关，在1 M HNO3溶液中，两种离子的分布系数(Kd)差最大。此外，结果表明，吸附反应在初始溶液-吸附剂接触数小时后开始，并在4-10小时内达到平衡。吸附对热的依赖性表明是自发过程。采用两种等温吸附模型研究了吸附机理。TBTDS吸附剂和T(2EH)TDS吸附剂的等温线形状不同。两种T(2EH)TDS吸附剂的等温线均符合Langmuir模型，但TBTDS的等温线呈s型，吸附的金属离子较多。这些结果表明，利用这些吸附剂可以分批分离Ba和Sr离子。
{"title":"Adsorption Behavior of Sr and Ba Using TDS-Impregnated Microporous Silica-Based Adsorbents in Nitric Acid Solution","authors":"Taiga Kawamura, T. Kudo, T. Ito, Hao Wu, Seongyun Kim","doi":"10.5182/jaie.33.8","DOIUrl":"https://doi.org/10.5182/jaie.33.8","url":null,"abstract":"Silica-based adsorbents impregnated tetra-n-butyl thiuram disulfide (TBTDS) or tetrakis (2-ethylhexyl) thiuram disulfide (T(2EH)TDS) as extractants on a macroporous silica/polymer composite support (SiO2-P) were prepared to separate barium (Ba) ions from strontium (Sr) ions present in mixed solutions. The Ba and Sr ion adsorption behaviors of each adsorbent were investigating by varying acid concentration, contact time, temperature, and metal concentrations in solution using the batch method. The Ba and Sr adsorption affinities depended on nitric acid concentration, and the difference in distribution coefficient (Kd) between the two ions was maximum in 1 M HNO3. Furthermore, results indicated that the adsorption reaction starts several hours after the initial solution–adsorbent contact and reaches equilibrium within 4–10 hours. The dependence for thermal for adsorption indicated to be spontaneous processes. The adsorption mechanisms were investigated by applying two isotherm models. The shapes of the isotherms were different between the TBTDS adsorbent and the T(2EH)TDS adsorbents. The isotherm for the two T(2EH)TDS adsorbents were well fitted by the Langmuir model, but that for TBTDS was S-shaped and more metal ions were adsorbed than the other adsorbents. These results suggest that the Ba and Sr ions could be separated from each other via the batch method using these adsorbents.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82123263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A hybrid donor compound 2,2’-[(2-ethylhexyl)imino]bis[N,N-bis(2-ethylhexyl)acetamide] (DAMIA-EH) impregnated silicabased adsorbent [(DAMIA-EH+1-dodecanol)/SiO2-P] was prepared. Its adsorption performance toward Pd(II) in nitric acid solution was investigated by examining the effect of contact time, temperature etc. It was found that the adsorption rate of Pd(II) was fairly fast and can reach a constant state within only 10 min. (DAMIA-EH+1-dodecanol)/SiO2-P exhibited an excellent recognition ability toward Pd(II) than other 14 types of co-existing metal ions and could maintain this selectivity when the concentration of HNO3 varied from 0.5 to 5 M. On the other hand, the maximum adsorption amount of Pd(II) was calculated to be as high as 0.440 mmol/g when [HNO3] = 2 M. Moreover, with increasing the temperature in solution, the uptake ratio of Pd(II) slightly decreased, it still exhibited a dominant selectivity toward Pd(II) in a wide temperature range from 288 to 323 K. The fitted thermodynamic parameters revealed that the adsorption process of Pd(II) was exothermic in nature and happened spontaneously.
制备了一种杂化给体化合物2,2′-[(2-乙基己基)亚胺]双[N,N-双(2-乙基己基)乙酰胺](DAMIA-EH)浸渍硅基吸附剂[(DAMIA-EH+1-十二醇)/SiO2-P]。考察了接触时间、温度等因素对其在硝酸溶液中对Pd(II)的吸附性能的影响。发现Pd (II)的吸附速度相当快,可以达到在仅10分钟。(DAMIA-EH + 1-dodecanol) / SiO2-P表现出一个优秀的识别能力对Pd (II)比其他14种共存金属离子,可以保持这种选择性当硝酸的浓度变化从0.5到5 m .另一方面,Pd (II)的最大吸附量计算高达0.440更易/ g(硝酸)= 2 m .此外,随着溶液温度的升高，Pd(II)的吸收率略有下降，但在288 ~ 323 K范围内仍对Pd(II)表现出优势选择性。拟合的热力学参数表明，Pd(II)的吸附过程是自发的、放热的。
{"title":"Adsorption Behaviors of Palladium(II) in Simulated High-Level Liquid Waste Using 2,2’-[(2-ethylhexyl)imino]bis[N,N-bis(2-ethylhexyl)acetamide]-impregnated Adsorbent","authors":"Hao Wu, M. Kubota, N. Osawa, Seongyun Kim","doi":"10.5182/JAIE.32.8","DOIUrl":"https://doi.org/10.5182/JAIE.32.8","url":null,"abstract":"A hybrid donor compound 2,2’-[(2-ethylhexyl)imino]bis[N,N-bis(2-ethylhexyl)acetamide] (DAMIA-EH) impregnated silicabased adsorbent [(DAMIA-EH+1-dodecanol)/SiO2-P] was prepared. Its adsorption performance toward Pd(II) in nitric acid solution was investigated by examining the effect of contact time, temperature etc. It was found that the adsorption rate of Pd(II) was fairly fast and can reach a constant state within only 10 min. (DAMIA-EH+1-dodecanol)/SiO2-P exhibited an excellent recognition ability toward Pd(II) than other 14 types of co-existing metal ions and could maintain this selectivity when the concentration of HNO3 varied from 0.5 to 5 M. On the other hand, the maximum adsorption amount of Pd(II) was calculated to be as high as 0.440 mmol/g when [HNO3] = 2 M. Moreover, with increasing the temperature in solution, the uptake ratio of Pd(II) slightly decreased, it still exhibited a dominant selectivity toward Pd(II) in a wide temperature range from 288 to 323 K. The fitted thermodynamic parameters revealed that the adsorption process of Pd(II) was exothermic in nature and happened spontaneously.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89418203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
For the purpose of efficient separation of metal ions dissolved in aqueous solutions, various separation materials have been synthesized and investigated their selectivity. For solvent extraction, negatively charged multidentate ligands were synthesized and their separation behavior was researched. In order to improve the selectivity of metal ions in aqueous solution, solvent extraction system was added octadecyl surface-modified silica gel (ODS-Silica). And also investigated the separation and the extraction behavior of ODS-Silica loaded with the solvent extraction reagent. In the system using negative divalent hexadentate reagent (H 2 Clbbpen) as the solvent extraction reagent, the extractability and selectivity were improved in both systems. TTA and Dithizone were selected as solvent extraction reagents to research the adsorption and separation of transition metal ions and noble metals, respectively. As an inexpensive separation material, banana fiber was focused and examined the selectivity of natural or chelated fiber. Banana fiber was chemically bonded with several Schiff base derivatives was found to be able to adsorption transition metal ions, but the selectivity and adsorption capacity were low. Banana fiber showed the ability to collect cesium and strontium, but its low heat resistance made it difficult to use. In this paper, the results of investigations on the adsorption capacity and selectivity of each separation material were described.
{"title":"Study on New Metal Ion Separation Materials using Solvent Extraction Reagent","authors":"H. Kokusen","doi":"10.5182/jaie.32.25","DOIUrl":"https://doi.org/10.5182/jaie.32.25","url":null,"abstract":"For the purpose of efficient separation of metal ions dissolved in aqueous solutions, various separation materials have been synthesized and investigated their selectivity. For solvent extraction, negatively charged multidentate ligands were synthesized and their separation behavior was researched. In order to improve the selectivity of metal ions in aqueous solution, solvent extraction system was added octadecyl surface-modified silica gel (ODS-Silica). And also investigated the separation and the extraction behavior of ODS-Silica loaded with the solvent extraction reagent. In the system using negative divalent hexadentate reagent (H 2 Clbbpen) as the solvent extraction reagent, the extractability and selectivity were improved in both systems. TTA and Dithizone were selected as solvent extraction reagents to research the adsorption and separation of transition metal ions and noble metals, respectively. As an inexpensive separation material, banana fiber was focused and examined the selectivity of natural or chelated fiber. Banana fiber was chemically bonded with several Schiff base derivatives was found to be able to adsorption transition metal ions, but the selectivity and adsorption capacity were low. Banana fiber showed the ability to collect cesium and strontium, but its low heat resistance made it difficult to use. In this paper, the results of investigations on the adsorption capacity and selectivity of each separation material were described.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86809963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I have participated in Ion Exchange Society Meeting since the 1st time held at an auditorium in Tokyo Institute of Technology Ookayama campus in October, 1985 until the 34 th meeting held at Yamagata University in 2019, where I have stared at the historical change. Therefore I’d like to introduce those about historical matter and globalization.
{"title":"Contribution to the Academic Standardization and Globalization of the Japan Ion Exchange Society","authors":"S. Shimazu","doi":"10.5182/jaie.32.47","DOIUrl":"https://doi.org/10.5182/jaie.32.47","url":null,"abstract":"I have participated in Ion Exchange Society Meeting since the 1st time held at an auditorium in Tokyo Institute of Technology Ookayama campus in October, 1985 until the 34 th meeting held at Yamagata University in 2019, where I have stared at the historical change. Therefore I’d like to introduce those about historical matter and globalization.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"112 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83557576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ion exchange materials of environmentally friendly having high selectivity for metal ions have been investigated, as such (1) preparation of coated solvent impregnated resin, to prevent from leakage of extractant, and its application to selective separation of metal ions and (2) novel ion exchange material based on photo-swing adsorption and its application to adsorptive separation of rare earth metals. The leakage of the extractant from the solvent impregnated resin, during operation, can be successfully suppressed by coating the solvent impregnated resin by cross-linked water-soluble polymer, although adsorption capacity is slightly decreased. Selective separation of rare earth metals can be achieved with column mode operation using the coated solvent impregnated resin. Novel photo-swing ion exchange material is also developed to decrease in the amount of eluent solution. Extractant and carbon nanotube, as molecular heater, are immobilized on thermosensitive polymer. The adsorption amount can be controlled by photo-irradiation, since phase transition of the thermosensitive polymer is occurred by the photo-irradiation. The difference in the adsorption amount, with and without photo-irradiation, can be increased by decrease in the cross-linking, although the immobilization of the carbon nanotube becomes difficult. The immobilization of the carbon nanotube can be improved by introducing pyrene group on the ion exchange material. Separation ability of several combinations of rare earth metals is increased by photo-irradiation.
{"title":"Studies on Selective Separation of Metal Ions with Ion Exchange Materials by Immobilizing Extractant","authors":"S. Nishihama","doi":"10.5182/JAIE.32.1","DOIUrl":"https://doi.org/10.5182/JAIE.32.1","url":null,"abstract":"Ion exchange materials of environmentally friendly having high selectivity for metal ions have been investigated, as such (1) preparation of coated solvent impregnated resin, to prevent from leakage of extractant, and its application to selective separation of metal ions and (2) novel ion exchange material based on photo-swing adsorption and its application to adsorptive separation of rare earth metals. The leakage of the extractant from the solvent impregnated resin, during operation, can be successfully suppressed by coating the solvent impregnated resin by cross-linked water-soluble polymer, although adsorption capacity is slightly decreased. Selective separation of rare earth metals can be achieved with column mode operation using the coated solvent impregnated resin. Novel photo-swing ion exchange material is also developed to decrease in the amount of eluent solution. Extractant and carbon nanotube, as molecular heater, are immobilized on thermosensitive polymer. The adsorption amount can be controlled by photo-irradiation, since phase transition of the thermosensitive polymer is occurred by the photo-irradiation. The difference in the adsorption amount, with and without photo-irradiation, can be increased by decrease in the cross-linking, although the immobilization of the carbon nanotube becomes difficult. The immobilization of the carbon nanotube can be improved by introducing pyrene group on the ion exchange material. Separation ability of several combinations of rare earth metals is increased by photo-irradiation.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77481149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Mori, T. Shinohara, H. Mimura, Taiji Chida, Y. Niibori
{"title":"Sr Adsorption Behavior of Potassium Dititanate in Contaminated Water with Salinity","authors":"K. Mori, T. Shinohara, H. Mimura, Taiji Chida, Y. Niibori","doi":"10.5182/JAIE.32.15","DOIUrl":"https://doi.org/10.5182/JAIE.32.15","url":null,"abstract":"","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"4 1","pages":"15-24"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81756565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We have developed a new type monolithic ion exchange resin which has a co-continuous porous structure, and we have been applying it for water treatment and for synthetic catalyst use. The pore structure was obtained by a two-step polymerization process. In the first step, an open-celled porous styrene-divinylbenzene copolymer was synthesized by preparation of water-in-oil (W/O) emulsion followed by polymerization. In the second step, the obtained copolymer was soaked and polymerized in a solution containing styrene, divinylbenzene, and a polymeric initiator. In order to obtain the monolithic ion exchange resin, functional groups, such as sulfonic acid and trimethylammonium, were introduced into the copolymer. The ion exchange capacity of both monolithic cation exchange resin (CEMR) and anion exchange resin (AEMR) were over 4 meq/g. The ion exchange band length of the monolithic ion exchange resins were approximately 10 times shorter than that of conventional ion exchange resin columns. Pd-supported AEMR (Pd/AEMR) was able to decompose hydrogen peroxide generated in the ultrapure water production line efficiently, and the treatment flow rate could be raised to approximately 10 times that of the Pd-supported cation exchange resin (Pd/CEMR). Pd/AEMR showed catalytic activity in hydrogenation reactions and coupling reactions, and in the continuous flow hydrogenation reaction using Pd/AEMR, higher yield was obtained in a shorter time than in batch reaction.
{"title":"Synthesis and Application of Monolithic Ion Exchange Resin","authors":"H. Takada","doi":"10.5182/jaie.32.33","DOIUrl":"https://doi.org/10.5182/jaie.32.33","url":null,"abstract":"We have developed a new type monolithic ion exchange resin which has a co-continuous porous structure, and we have been applying it for water treatment and for synthetic catalyst use. The pore structure was obtained by a two-step polymerization process. In the first step, an open-celled porous styrene-divinylbenzene copolymer was synthesized by preparation of water-in-oil (W/O) emulsion followed by polymerization. In the second step, the obtained copolymer was soaked and polymerized in a solution containing styrene, divinylbenzene, and a polymeric initiator. In order to obtain the monolithic ion exchange resin, functional groups, such as sulfonic acid and trimethylammonium, were introduced into the copolymer. The ion exchange capacity of both monolithic cation exchange resin (CEMR) and anion exchange resin (AEMR) were over 4 meq/g. The ion exchange band length of the monolithic ion exchange resins were approximately 10 times shorter than that of conventional ion exchange resin columns. Pd-supported AEMR (Pd/AEMR) was able to decompose hydrogen peroxide generated in the ultrapure water production line efficiently, and the treatment flow rate could be raised to approximately 10 times that of the Pd-supported cation exchange resin (Pd/CEMR). Pd/AEMR showed catalytic activity in hydrogenation reactions and coupling reactions, and in the continuous flow hydrogenation reaction using Pd/AEMR, higher yield was obtained in a shorter time than in batch reaction.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84861625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
resin, suspension polymerization The St-80 resin high functionality, of the fully porous resin. carbohydrate analysis by HPLC using St-80 a Abstract A novel core-shell ion-exchange resin (St-80) having a 20:80 weight ratio of the monomer for the core and the shell was prepared for use in high-performance liquid chromatography (HPLC), and the effect of the degree of cross-linking (10–55%) of the porous shell on the separation of carbohydrates was examined. A mixed aqueous sample of inositol, glucose, fructose, and sucrose was reasonably separated under strong alkaline conditions (0.10 and 0.15 mol/L NaOH eluent) at flow rates of 0.3–0.7 mL/min. As the degree of cross-linking in the shell portion increased, the retention time of sucrose, which had the longest elution time, decreased. Meanwhile, the theoretical plate number nearly doubled. The retention times obtained for the high degrees of cross-linking (40% and 55%) in the porous shell were shorter than that of the fully porous resin. The theoretical plate number observed for these resins provided excellent resolution, similar to that of the fully porous resin.
{"title":"Elution Behavior of Carbohydrates for Core-Shell Ion-Exchange Resins with Different Degrees of Cross-Linking in Porous Shell Layer","authors":"S. Mitomo, Y. Negishi, T. Mutai, Y. Inoue","doi":"10.5182/jaie.32.40","DOIUrl":"https://doi.org/10.5182/jaie.32.40","url":null,"abstract":"resin, suspension polymerization The St-80 resin high functionality, of the fully porous resin. carbohydrate analysis by HPLC using St-80 a Abstract A novel core-shell ion-exchange resin (St-80) having a 20:80 weight ratio of the monomer for the core and the shell was prepared for use in high-performance liquid chromatography (HPLC), and the effect of the degree of cross-linking (10–55%) of the porous shell on the separation of carbohydrates was examined. A mixed aqueous sample of inositol, glucose, fructose, and sucrose was reasonably separated under strong alkaline conditions (0.10 and 0.15 mol/L NaOH eluent) at flow rates of 0.3–0.7 mL/min. As the degree of cross-linking in the shell portion increased, the retention time of sucrose, which had the longest elution time, decreased. Meanwhile, the theoretical plate number nearly doubled. The retention times obtained for the high degrees of cross-linking (40% and 55%) in the porous shell were shorter than that of the fully porous resin. The theoretical plate number observed for these resins provided excellent resolution, similar to that of the fully porous resin.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80029467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hiroshi Takahashi, Kasumi Takahashi, K. Fujita, T. Nishide
This paper describes selective separation of cobalt and nickel ions from their mixed solution using the electrodialysis reversal (ED-R) process. In experiments using the conventional electrodialysis process, the fluxes of cobalt and nickel ions were almost identical under the conditions used. Conversely, when electrodialysis experiments were conducted in the presence of Ethylene Diamine Tetraacetic Acid (EDTA), cobalt ions preferentially permeated through a cation-exchange membrane and were well separated. Based on these results, cobalt and nickel ions were permeated into a compartment containing an EDTA aqueous solution by normal electrodialysis operation, and then ED-R was performed with the polarity reversed to separate the cobalt and nickel ions. The ED-R -operation facilitated to effectively separate the nickel and cobalt ions. We also attempted to recover the nickel ions and EDTA from their mixed solution using a precipitation method. The recovery rate of EDTA reached 80 ％ , and the solution turned green at a lower pH of 0.4.
{"title":"Separation of Cobalt and Nickel Ions Using Electrodialysis Reversal in the Presence of Ethylene Diamine Tetraacetic Acid","authors":"Hiroshi Takahashi, Kasumi Takahashi, K. Fujita, T. Nishide","doi":"10.5182/jaie.31.9","DOIUrl":"https://doi.org/10.5182/jaie.31.9","url":null,"abstract":"This paper describes selective separation of cobalt and nickel ions from their mixed solution using the electrodialysis reversal (ED-R) process. In experiments using the conventional electrodialysis process, the fluxes of cobalt and nickel ions were almost identical under the conditions used. Conversely, when electrodialysis experiments were conducted in the presence of Ethylene Diamine Tetraacetic Acid (EDTA), cobalt ions preferentially permeated through a cation-exchange membrane and were well separated. Based on these results, cobalt and nickel ions were permeated into a compartment containing an EDTA aqueous solution by normal electrodialysis operation, and then ED-R was performed with the polarity reversed to separate the cobalt and nickel ions. The ED-R -operation facilitated to effectively separate the nickel and cobalt ions. We also attempted to recover the nickel ions and EDTA from their mixed solution using a precipitation method. The recovery rate of EDTA reached 80 ％ , and the solution turned green at a lower pH of 0.4.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87793952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Connection between Ion Exchange Technology and Me","authors":"T. Aritomi","doi":"10.5182/jaie.31.37","DOIUrl":"https://doi.org/10.5182/jaie.31.37","url":null,"abstract":"","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"35 1","pages":"37-42"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85409630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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