Recycling of fluoride industrial wastes is difficult to dispose, since the fluoride ions eluted again easily. In this study, newly effective inhibition method in both neutral and alkaline region for fluoride elution was investigated. Fluoride elution concentration from CaF2 was 9.8 mg/L at pH 8.1 and 288.5 mg/L at pH 12.2 with water/solid ratio of 10. Additions of Ca(OH)2, CaCl2 and NH4H2PO4 could restrain fluoride elution concentration of CaF2 to 0.22 mg/L in the neutral region. This inhibition of fluoride elution was due to a generation of hydroxyapatite (HAp) or chlorapatite (ClAp) which has high ion exchange capacity. Additions of Portland cement, Ca(OH)2 and MgCl2 could restrain fluoride elution concentration of CaF2 to 0.47 mg/L in alkaline region. It was only 0.16% of 288.5mg/L which was the fluoride elution concentration from CaF2 at pH 12.2. The elution of fluoride ions was restrained by the coprecipitating of CaF2 with the high content of Ca 2+ provided from Ca(OH)2 and cement hydrates. The carbonation of Ca 2+ was prevented by the addition of Mg. Moreover, the forming of ettringite with a high ion-exchange capacity and the solidification effect of Ca-bearing hydrates contributed to the inhibition of the elution of fluoride. These additives for the practical industrial wastes, such as paper sludge and coal ash, with high concentration of fluoride were conducted. The result indicates that the fluoride elution could be restrained to meet the environmental standard (0.8 mg/L) in Japan in alkaline region. This inhibition method for fluoride elution would be able to contribute to promotion of recycling of fluoride industrial wastes.
{"title":"The Inhibition of Fluoride Elution from Industrial Wastes with Portland Cement, Calcium and Magnesium Salts in Alkaline Region","authors":"Xiaoxu Kuang, A. Sasaki, M. Endo","doi":"10.5182/JAIE.29.140","DOIUrl":"https://doi.org/10.5182/JAIE.29.140","url":null,"abstract":"Recycling of fluoride industrial wastes is difficult to dispose, since the fluoride ions eluted again easily. In this study, newly effective inhibition method in both neutral and alkaline region for fluoride elution was investigated. Fluoride elution concentration from CaF2 was 9.8 mg/L at pH 8.1 and 288.5 mg/L at pH 12.2 with water/solid ratio of 10. Additions of Ca(OH)2, CaCl2 and NH4H2PO4 could restrain fluoride elution concentration of CaF2 to 0.22 mg/L in the neutral region. This inhibition of fluoride elution was due to a generation of hydroxyapatite (HAp) or chlorapatite (ClAp) which has high ion exchange capacity. Additions of Portland cement, Ca(OH)2 and MgCl2 could restrain fluoride elution concentration of CaF2 to 0.47 mg/L in alkaline region. It was only 0.16% of 288.5mg/L which was the fluoride elution concentration from CaF2 at pH 12.2. The elution of fluoride ions was restrained by the coprecipitating of CaF2 with the high content of Ca 2+ provided from Ca(OH)2 and cement hydrates. The carbonation of Ca 2+ was prevented by the addition of Mg. Moreover, the forming of ettringite with a high ion-exchange capacity and the solidification effect of Ca-bearing hydrates contributed to the inhibition of the elution of fluoride. These additives for the practical industrial wastes, such as paper sludge and coal ash, with high concentration of fluoride were conducted. The result indicates that the fluoride elution could be restrained to meet the environmental standard (0.8 mg/L) in Japan in alkaline region. This inhibition method for fluoride elution would be able to contribute to promotion of recycling of fluoride industrial wastes.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82665530","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}
Suzuka Soma, Takahito Suzuki, Tewodros Bekele, Yuji Tsuchido, T. Hashimoto, T. Hayashita
Saccharides play vital roles in regulating birth, immunity, and differentiation. In nature, these saccharides were recognized by lectin. However, lectins are easily denatured by environmental changes, so artificial chemical sensors are highly desired. Herein, we developed boronic acid fluorescent probe (B-Nap-C4) for saccharide recognition. B-Nap-C4/cyclodextrin (CyD) complex gel was prepared and evaluated the saccharide recognition function. B-Nap-C4/β-CyD gel could recognize lower concentration of saccharides by comparison with B-Nap-C4/β-CyD solution. B-Nap-C4/β-CyD gel selectively adsorbed fructose and showed fluorescence emission. The gel could capture and condense fructose from saccharide solution. Thus a trace amount of fructose can be selectively detected by fluorescence intensity changes of the gel. Also, the B-Nap-C4/β-CyD gel was found to be recycled for saccharide adsorption in water.
{"title":"Design of Saccharide Recognition Material Based on Boronic Acid Fluorophore/Cyclodextrin Gel","authors":"Suzuka Soma, Takahito Suzuki, Tewodros Bekele, Yuji Tsuchido, T. Hashimoto, T. Hayashita","doi":"10.5182/JAIE.29.126","DOIUrl":"https://doi.org/10.5182/JAIE.29.126","url":null,"abstract":"Saccharides play vital roles in regulating birth, immunity, and differentiation. In nature, these saccharides were recognized by lectin. However, lectins are easily denatured by environmental changes, so artificial chemical sensors are highly desired. Herein, we developed boronic acid fluorescent probe (B-Nap-C4) for saccharide recognition. B-Nap-C4/cyclodextrin (CyD) complex gel was prepared and evaluated the saccharide recognition function. B-Nap-C4/β-CyD gel could recognize lower concentration of saccharides by comparison with B-Nap-C4/β-CyD solution. B-Nap-C4/β-CyD gel selectively adsorbed fructose and showed fluorescence emission. The gel could capture and condense fructose from saccharide solution. Thus a trace amount of fructose can be selectively detected by fluorescence intensity changes of the gel. Also, the B-Nap-C4/β-CyD gel was found to be recycled for saccharide adsorption in water.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84401150","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}
As an adsorbing material for recovering cesium from radioactive contaminated water, a sponge-like compound was synthesized using sodium-form synthetic mica (Na-TSM) as an ion exchanger which does not contain lithium and is inexpensive and readily available. The cesium adsorption ratio from aqueous solutions was 80% or higher in low cesium concentration region and the desorption ratio was less than 5%. It suggests that synthesized sponge-like material is much adapted as cesium adsorbent.
{"title":"Study for the Formation of Sponge-like Ion Exchanger Containing Sodium-form Synthetic Mica and Its Cesium Adsorption Characteristics","authors":"N. Suzuki, Kaori Suzuki, S. Karasawa","doi":"10.5182/JAIE.29.195","DOIUrl":"https://doi.org/10.5182/JAIE.29.195","url":null,"abstract":"As an adsorbing material for recovering cesium from radioactive contaminated water, a sponge-like compound was synthesized using sodium-form synthetic mica (Na-TSM) as an ion exchanger which does not contain lithium and is inexpensive and readily available. The cesium adsorption ratio from aqueous solutions was 80% or higher in low cesium concentration region and the desorption ratio was less than 5%. It suggests that synthesized sponge-like material is much adapted as cesium adsorbent.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"183 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72669745","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}
ZnAl LDH has been successfully prepared as single phase by urea as precipitant. Anion exchange is conducted for Ag(CN)2 intercalation. After the LDH has been intercalated by Ag(CN)2 , the anion is reduced into Ag(0) state. The structure of Ag-intercalated LDH was examined by synchrotron XRD. In the sample, the Ag(0) exists at closer position than center between hydroxide layers due to no coordinated H2O molecules. UV-vis spectra confirm the existence of surface plasmon resonance at around 380 nm. Finally, the LDH has been examined for its photocatalytic activity by phenol degradation in the aqueous solution with Xe light irradiation. The concentration of phenol is continuously decreased during photocatalyst process by the ZnAl/Ag LDH sample. The degradation rate of the sample is much better than those of the pure LDH and unreduced samples. In this case, phenol solution with the concentration of 20 mg/L can be degraded completely for 120 min.
{"title":"Hybridization of Metal Nanoparticle of ZnAl Layered Double Hydroxide and its Application for Photocatalyst Phenol Degradation","authors":"P. Lestari, T. Takei, S. Yanagida, N. Kumada","doi":"10.5182/JAIE.29.48","DOIUrl":"https://doi.org/10.5182/JAIE.29.48","url":null,"abstract":"ZnAl LDH has been successfully prepared as single phase by urea as precipitant. Anion exchange is conducted for Ag(CN)2 intercalation. After the LDH has been intercalated by Ag(CN)2 , the anion is reduced into Ag(0) state. The structure of Ag-intercalated LDH was examined by synchrotron XRD. In the sample, the Ag(0) exists at closer position than center between hydroxide layers due to no coordinated H2O molecules. UV-vis spectra confirm the existence of surface plasmon resonance at around 380 nm. Finally, the LDH has been examined for its photocatalytic activity by phenol degradation in the aqueous solution with Xe light irradiation. The concentration of phenol is continuously decreased during photocatalyst process by the ZnAl/Ag LDH sample. The degradation rate of the sample is much better than those of the pure LDH and unreduced samples. In this case, phenol solution with the concentration of 20 mg/L can be degraded completely for 120 min.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86443668","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}
T. Kajiyama, Kensuke Arai, Satoshi Ohmuro, T. Maruyama, Chika Shimose, Satomi Makino, Shuhei Takase, H. Kokusen
The adsorption properties of banana fibers for rare-earth metal ions (La, Gd, Tm, Pr, Tb, Yb, Nd, Dy, Lu, Sm, Ho, Eu, and Er) were investigated, and the concentrations of metal ions were measured by using an inductively coupled plasma optical emission spectrometer. The pH value of the aqueous phase was measured using a pH meter equipped with glass electrodes. Over 70% of all the metal ions were adsorbed on non-treated banana fiber at pH values ranging from 2.0 to 6.0. On the other hand, using alkali-treated banana fiber, the adsorption ratio for rare-earth metal ions increased with pH. The reaction equation for the alkali-treated banana fiber system was investigated by the slope analysis between logarithmic distribution ratio and pH. The results suggest that not only the hydroxy groups originated from the interaction between cellulose and metal ions but also other negative ions might be involved in the ionexchange reaction in the alkali-treated banana fiber. Such distinct behavior raises the possibility of the utilization of banana fibers in the separation and adsorption of metal ions.
{"title":"Adsorption of Rare-Earth Metal Ions on Natural Banana Fiber","authors":"T. Kajiyama, Kensuke Arai, Satoshi Ohmuro, T. Maruyama, Chika Shimose, Satomi Makino, Shuhei Takase, H. Kokusen","doi":"10.5182/JAIE.29.116","DOIUrl":"https://doi.org/10.5182/JAIE.29.116","url":null,"abstract":"The adsorption properties of banana fibers for rare-earth metal ions (La, Gd, Tm, Pr, Tb, Yb, Nd, Dy, Lu, Sm, Ho, Eu, and Er) were investigated, and the concentrations of metal ions were measured by using an inductively coupled plasma optical emission spectrometer. The pH value of the aqueous phase was measured using a pH meter equipped with glass electrodes. Over 70% of all the metal ions were adsorbed on non-treated banana fiber at pH values ranging from 2.0 to 6.0. On the other hand, using alkali-treated banana fiber, the adsorption ratio for rare-earth metal ions increased with pH. The reaction equation for the alkali-treated banana fiber system was investigated by the slope analysis between logarithmic distribution ratio and pH. The results suggest that not only the hydroxy groups originated from the interaction between cellulose and metal ions but also other negative ions might be involved in the ionexchange reaction in the alkali-treated banana fiber. Such distinct behavior raises the possibility of the utilization of banana fibers in the separation and adsorption of metal ions.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"87 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85618111","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. Kitamura, Y. Kasai, Yuji Tsuchido, T. Hashimoto, T. Hayashita
Food safety is one of the concerned issues. As a result, the managements to protect consumers adequately from foodborne illness are to be required. The standard method for specific pathogen detection is culture method. However, conventional methods based on culture have disadvantages of time-consuming, which might cause infectious diseases to spread rapidly. Therefore, rapid and simple methods for bacteria detection have been attracting much attention in this research area. Recently, we developed dipicolylamine (dpa)-modified fluorescent silica nanoparticles (FSiNP) for bacteria detection. In this study, we prepared two FSiNPs (Bt/dpa-HCC/FSiNP and B/FSiNP) whose surfaces were modified with dipicolylamine or phenyl boronic acid. Cu-Bt/dpa-HCC/FSiNP formed aggregates with both S. aureus and E. coli, whereas B/FSiNP formed aggregates with S. aureus selectively. Bt/dpa-HCC/FSiNP could examine the existence of bacteria in water and B/FSiNP could detect either S. aureus or E. coli. These results demonstrated that surface-functionalized silica nanoparticles could detect bacteria in water
{"title":"Design and Function of Fluorescent Silica Nanoparticles for Bacteria Detection","authors":"A. Kitamura, Y. Kasai, Yuji Tsuchido, T. Hashimoto, T. Hayashita","doi":"10.5182/JAIE.29.121","DOIUrl":"https://doi.org/10.5182/JAIE.29.121","url":null,"abstract":"Food safety is one of the concerned issues. As a result, the managements to protect consumers adequately from foodborne illness are to be required. The standard method for specific pathogen detection is culture method. However, conventional methods based on culture have disadvantages of time-consuming, which might cause infectious diseases to spread rapidly. Therefore, rapid and simple methods for bacteria detection have been attracting much attention in this research area. Recently, we developed dipicolylamine (dpa)-modified fluorescent silica nanoparticles (FSiNP) for bacteria detection. In this study, we prepared two FSiNPs (Bt/dpa-HCC/FSiNP and B/FSiNP) whose surfaces were modified with dipicolylamine or phenyl boronic acid. Cu-Bt/dpa-HCC/FSiNP formed aggregates with both S. aureus and E. coli, whereas B/FSiNP formed aggregates with S. aureus selectively. Bt/dpa-HCC/FSiNP could examine the existence of bacteria in water and B/FSiNP could detect either S. aureus or E. coli. These results demonstrated that surface-functionalized silica nanoparticles could detect bacteria in water","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"68 3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82471609","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}
Atsushi Kuraoka, Toshiyuki Umebayashi, S. Nishihama, K. Yoshizuka
We investigated removal of arsenic (As) from water using a combination of adsorption on a Nmethylglucamine-modified chelate fiber and oxidation of As(III) to As(V) by manganese dioxide. Batch experiments revealed that the chelate fiber had high selectivity for As(V) over As(III), especially in the acidic pH region, because of differences in the species distribution of As in an aqueous solution. Oxidative and selective adsorption of As(III) was achieved when manganese dioxide was added to the adsorption system with the chelate fiber. The oxidative adsorption could be performed using the connected columns of the manganese dioxide and the chelate fiber. As(III) in the aqueous feed solution was oxidized to As(V) as it passed through the manganese dioxide column, and this was followed by adsorption of As(V) in the chelate fiber column. This method provides a simple removal method of As, as both As(III) and As(V),
{"title":"Oxidative Adsorption of Arsenic by N-Methylglucamine-modified Chelate Fiber and Manganese Dioxide","authors":"Atsushi Kuraoka, Toshiyuki Umebayashi, S. Nishihama, K. Yoshizuka","doi":"10.5182/JAIE.29.163","DOIUrl":"https://doi.org/10.5182/JAIE.29.163","url":null,"abstract":"We investigated removal of arsenic (As) from water using a combination of adsorption on a Nmethylglucamine-modified chelate fiber and oxidation of As(III) to As(V) by manganese dioxide. Batch experiments revealed that the chelate fiber had high selectivity for As(V) over As(III), especially in the acidic pH region, because of differences in the species distribution of As in an aqueous solution. Oxidative and selective adsorption of As(III) was achieved when manganese dioxide was added to the adsorption system with the chelate fiber. The oxidative adsorption could be performed using the connected columns of the manganese dioxide and the chelate fiber. As(III) in the aqueous feed solution was oxidized to As(V) as it passed through the manganese dioxide column, and this was followed by adsorption of As(V) in the chelate fiber column. This method provides a simple removal method of As, as both As(III) and As(V),","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87605532","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}
Sou Watanabe, Hideya Suzuki, I. Goto, H. Kofuji, T. Matsumura
Chemical compounds containing scandium (Sc) are widely applied to various fields such as catalysts, alloys, lamps and etc. Sc is found in mineral ore, and it is necessary to develop efficient Sc separation and recovery technology for the industrial applications. N,N,N’,N’,N’’,N’’-hexaoctylnitrilotriacetamide (HONTA) extractant has been shown to be promising for selective Sc extraction. In this study, applicability of the extraction chromatography technology using HONTA impregnated adsorbent for the selective Sc recovery from other rare earth elements (REs) was experimentally evaluated through batch-wise adsorption/elution studies and column separation experiments. Batch-wise experiments showed that distribution coefficient of Sc onto the HONTA/SiO2-P adsorbent was far larger than those of other REs at acidity region with 0.001 < [HNO3] < 4 mol dm -3 and that the adsorbed Sc was efficiently eluted into 1 M H2SO4 solution. Appropriate experimental conditions for the column separation experiment were proposed based on those results, and performance of the flow-sheet was examined for laboratory scale column system. Only Sc in 4 mol dm HNO3 solution was adsorbed into a packed column with the adsorbent while other REs were discharged from the column with the feed solution, and then loaded Sc was properly eluted into 1 M H2SO4 solution. Purity of the Sc product solution obtained by the column separation experiment depended on Sc recovery ratio, and about 99.9 % purity was achieved with 97 % recovery ratio. The residual Sc was eluted from the column with other REs and did not remain inside the column, therefore repeated used of the column was shown to be possible. This process was shown to be promising for selective Sc recovery from mixture of REs in nitric acid.
{"title":"Selective Sc Recovery from Rare Earths in Nitric Acid Medium by Extraction Chromatography","authors":"Sou Watanabe, Hideya Suzuki, I. Goto, H. Kofuji, T. Matsumura","doi":"10.5182/JAIE.29.71","DOIUrl":"https://doi.org/10.5182/JAIE.29.71","url":null,"abstract":"Chemical compounds containing scandium (Sc) are widely applied to various fields such as catalysts, alloys, lamps and etc. Sc is found in mineral ore, and it is necessary to develop efficient Sc separation and recovery technology for the industrial applications. N,N,N’,N’,N’’,N’’-hexaoctylnitrilotriacetamide (HONTA) extractant has been shown to be promising for selective Sc extraction. In this study, applicability of the extraction chromatography technology using HONTA impregnated adsorbent for the selective Sc recovery from other rare earth elements (REs) was experimentally evaluated through batch-wise adsorption/elution studies and column separation experiments. Batch-wise experiments showed that distribution coefficient of Sc onto the HONTA/SiO2-P adsorbent was far larger than those of other REs at acidity region with 0.001 < [HNO3] < 4 mol dm -3 and that the adsorbed Sc was efficiently eluted into 1 M H2SO4 solution. Appropriate experimental conditions for the column separation experiment were proposed based on those results, and performance of the flow-sheet was examined for laboratory scale column system. Only Sc in 4 mol dm HNO3 solution was adsorbed into a packed column with the adsorbent while other REs were discharged from the column with the feed solution, and then loaded Sc was properly eluted into 1 M H2SO4 solution. Purity of the Sc product solution obtained by the column separation experiment depended on Sc recovery ratio, and about 99.9 % purity was achieved with 97 % recovery ratio. The residual Sc was eluted from the column with other REs and did not remain inside the column, therefore repeated used of the column was shown to be possible. This process was shown to be promising for selective Sc recovery from mixture of REs in nitric acid.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84235803","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":"Prolongation Technology of Life Time of Ion Exchange Resins in Nuclear Power Plants","authors":"T. Izumi, Komatsu Makoto, Deguchi Tatsuya","doi":"10.5182/JAIE.29.188","DOIUrl":"https://doi.org/10.5182/JAIE.29.188","url":null,"abstract":"","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84359253","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}
In this study, it is attempted to prepare the adsorbent with highly selective phosphorus adsorption material from zircon sand by a simple mechanochemical treatment. The phosphorus adsorption property of the products obtained under various mechanochemical treatment conditions were investigated by various phosphorus adsorption experiments. With increasing the time of mechanochemical treatment, the phosphorus adsorption amount of the product increased within 10 min, regardless the ball diameter. The phosphorus adsorption amount of the product was about 2.5 times larger than that of the raw zircon sand. The adsorption amount of phosphorus increased with decreasing the pH value at the equilibrium, and was about 3.5 times larger at pH 1 than at pH 7. The product showed the same adsorption amount in Imari bay seawater as that in the aqueous solution at pH 7, which means that phosphorus can be selectively adsorbed on the product in the solution with high salt concentration. The adsorption isotherm at pH 1 was found to applicable to Langmuir model rather than Freundlich model. The maximum calculated adsorption amount was 0.034 mmol g. XRD and FT-IR analyses of the product did not change greatly by mechanochemical treatment, except the Zr-O binding of zircon sand.
{"title":"Preparation of Highly Selective Phosphorus Adsorbent from Zircon Sand (ZrSiO4) by Mechanochemical Treatment","authors":"K. Hirota, T. Wajima","doi":"10.5182/JAIE.29.158","DOIUrl":"https://doi.org/10.5182/JAIE.29.158","url":null,"abstract":"In this study, it is attempted to prepare the adsorbent with highly selective phosphorus adsorption material from zircon sand by a simple mechanochemical treatment. The phosphorus adsorption property of the products obtained under various mechanochemical treatment conditions were investigated by various phosphorus adsorption experiments. With increasing the time of mechanochemical treatment, the phosphorus adsorption amount of the product increased within 10 min, regardless the ball diameter. The phosphorus adsorption amount of the product was about 2.5 times larger than that of the raw zircon sand. The adsorption amount of phosphorus increased with decreasing the pH value at the equilibrium, and was about 3.5 times larger at pH 1 than at pH 7. The product showed the same adsorption amount in Imari bay seawater as that in the aqueous solution at pH 7, which means that phosphorus can be selectively adsorbed on the product in the solution with high salt concentration. The adsorption isotherm at pH 1 was found to applicable to Langmuir model rather than Freundlich model. The maximum calculated adsorption amount was 0.034 mmol g. XRD and FT-IR analyses of the product did not change greatly by mechanochemical treatment, except the Zr-O binding of zircon sand.","PeriodicalId":16331,"journal":{"name":"Journal of ion exchange","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89666163","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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