scholarly journals Sorption of Perrhenate Ions by a New Anion Exchanger Based on an Oligomer of Epichlorohydrin and 4-vinylpyridine

2015 ◽  
Vol 15 (4) ◽  
pp. 321
Author(s):  
А. Pidakhmet ◽  
E.E. Ergozhin ◽  
T.K. Chalov ◽  
A.I. Nikitina
Keyword(s):  
Anion Exchanger ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Exchange Capacity ◽  
Static Exchange Capacity ◽  
Electronic Microscopy ◽  
Ammonium Perrhenate ◽  
Wide Range ◽  
Before And After ◽  
Microscopy Method

<p>In this study, oligomer epichlorohydrine (OECH) was crosslinked with 4-vinylpyridin (VP) present initiator of peroxide benzoyl (BP). The resulting anionite (OECH-VP) was characterized by scanning<br /> electron microscopy (SEM) and tested for perrhenate ions  sorption. The new macropore anion exchange resin was  synthesized by polycondensation of epichlorohydrin oligomer and 4-vinylpyridine, the static exchange capacity (SEC) of which is equal to 6.75 mg-equiv∙g<sup>-1</sup> in 0.1 M HCI solution and the sorption of perrhenate ions was studied. The influence of the concentration and pH of the model ammonium perrhenate solutions, contact time on the sorption activity of new anion exchangers (ECHO-VP) to perrhenate ions were studied. When studying the concentration effect of NH<sub>4</sub>ReO<sub>4</sub> on the sorption of perrhenate ions by anionite ECHO-VP, the recovery degree at the content of 0.1-0.7 g/L of rhenium remained virtually unchanged and varied between 91- and 92%. When increasing the concentration of rhenium up to 1.02 g/L, the recovery degree (A) is reduced to 86%. The time to reach the equilibrium between the anion exchanger ECHO-VP and the solution of NH<sub>4</sub>ReO<sub>4</sub>, containing 0.94 g/L of rhenium and having a pH of 5.1 is 6 hours. Thus in the first 15 minutes 81% perrhenate ions are recovered. Structure of the surface anionite before and after sorption of rhenium ions were studied by electronic  microscopy method. The results revealed that the anionite ECHO-VP has a folded surface with a developed system of macropores and the size of macropores was found to vary between 0.70-1.76 mc, and individual pores reach 2.59 mc. It was established that ion exchanger based on oligomers of  epichlorohydrin and 4-vinylpyridine have better sorption properties for rhenium (VII) ions that a wide range of commercial sorbents. It was found that the sorption capacity and the extent of new anion extracting the perrhenate ions and reach their maximum values are respectively 371.6 mg∙Re/g and 99% at pH 5.1.</p>

scholarly journals Procedure to reduce sulphite in wine with anion-exchange resin

2012 ◽  
Vol 60 (8) ◽  
pp. 79-86
Author(s):  
Miroslav Horák ◽  
Pavel Híc ◽  
Eva Tománková ◽  
Josef Balík
Keyword(s):  
Tartaric Acid ◽  
Anion Exchange ◽  
Malic Acid ◽  
Anion Exchanger ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Sodium Bicarbonate Solution ◽  
Basic Anion Exchange Resin ◽  
Basic Anion ◽  
Exchange Resins

The aim of this experiment was to eliminate SO2 ions present in wine using the anion-exchanger resins. To compare the effectiveness, 2 following strongly basic anion-exchange resin were used. When activated, the sodium bicarbonate solution (activation solution I) is used to prevent parallel reduction of sulphites, tartates and malates, so the anion-exchange resins were activated in two-step activation. In the second step, it was immersed into a mixture of malic acid and tartaric acid (1:1). After the application of anex into wine, the content of total SO2 was reduced to 97–201 mg.L−1 (depending on the amount of anex added into the wine sample). According to our expectations, the variants with anion-exchange resin activated only with bicarbonate solution, the tartrates and malates were significantly reduced. If the anion-exchange resin was activated with a two-steps activation, the tartaric acid and malic acid were reduced in the range of ± 0.13 g.L−1. This phenomenon was strongly reflected at the anion-exchanger Aqua Osmotic 02. The changes in antioxidant content were not affected by the type of anion-exchange resin, the method of activation, or an amount of used anion-exchanger. The color parameters of wine, expressed by the L * a * b *, were not significantly affected by the effects of anion-exchange resin use.

scholarly journals Fast Recovery of Lead from Hydrochloric Acid via a Novel Silica-Supported Anion Exchange Resin for the Determination of 210Pb in Environmental Samples

2020 ◽  
Author(s):  
Lifeng Chen ◽  
Jie Zhang ◽  
Xianwen He ◽  
Manqing Liu ◽  
Qiuyang Wei ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Environmental Samples ◽  
Adsorption Mechanism ◽  
Exchange Resin ◽  
Separation Efficiency ◽  
Anion Exchange Resin ◽  
Chemical Yield ◽  
Flow Speed ◽  
Exchange Capacity ◽  
Hcl Solution

The<b> </b>measurement of <sup>210</sup>Pb is significant in environmental studies. Lead separation in HCl solution is a vital procedure but suffers from poor efficiency with high labor and time costs. To overcome this problem, a novel anion exchange resin was synthesized and characterized by different techniques followed by studies on the adsorption behaviors towards lead in HCl solution. The results suggest that SiPS-N(CH<sub>3</sub>)<sub>3</sub>Cl was successfully prepared with small particle size, low water swelling rate, and large specific surface area. The maximum anion exchange capacity resulted from quaternary amine groups was determined to be 1.0 mmol (Cl<sup>-</sup>)/g.The adsorption activities reached equilibrium within 3 min under selected conditions offering extremely fast adsorption kinetics. The synergistic adsorption mechanism, the multilayer adsorption mechanism, and the competition from co-existing chloride anions were found to be responsible for the lead adsorption performance of SiPS-N(CH<sub>3</sub>)<sub>3</sub>Cl. Column experiments showed that the feeding volume of lead and HCl had impact on the chemical yield regardless of the co-existence of high concentrations of FeCl<sub>3</sub> (90 mM) and a high flow speed (4.0 mL/min). Based on these results, a separation process integrating SiPS-N(CH<sub>3</sub>)<sub>3</sub>Cl and the matched parameters was finally developed and tested. Our work greatly raised the lead separation efficiency in HCl solutions with implications for measuring <sup>210</sup>Pb in environmental samples.

Study on the Sorption of Rhenium by Anion Exchange Resin

2011 ◽  
Vol 201-203 ◽  
pp. 1821-1824
Author(s):  
Hong Zhou Ma ◽  
Xin Zhe Lan ◽  
Yao Ning Wang
Keyword(s):  
Anion Exchange ◽  
Separation Factor ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Exchange Capacity ◽  
Desorption Rate ◽  
Strong Base ◽  
Loaded Resin ◽  
Result Show ◽  
Leaching Solution

Techniques are applied for the sorption of rhenium from the leaching solution of the fume of calcinating molybdenite concentrate by 201×7 strong base anion exchange resin. By analyzing the main ion from the leaching solution be pretreatmented, the 201×7 strong base anion exchange resin be used in experiment. The influencing factors on the sorption were investigated, with medium pH, the existing form of the ion in the solution and the pH are greatly related to the ion exchange capacity , the result show that the resin not only have higher adsorption rate of ReO4-, but also have higher separation factor of ReO4-and MoO42-when the leaching solution was pretreated pH at 9.0. The separation factor of ReO4-and MoO42-reached to 980.5. 5%NH4OH+9%NH4Cl solution is a effective desorption reagent for molybdenum, the desorption rate is 96% and nitric acid solution is a effective desorption reagent for rhenium on the loaded resin after desorpted the MoO42-,the desorption rate of ReO4-is 98%.

THE ESTIMATION OF NUCLEIC ACIDS IN SOME ALGAE AND HIGHER PLANTS

1960 ◽  
Vol 38 (1) ◽  
pp. 31-49 ◽  
Author(s):  
Robert M. Smillie ◽  
G. Krotkov
Keyword(s):  
Nucleic Acids ◽  
Paper Chromatography ◽  
Exchange Resin ◽  
Higher Plants ◽  
Anion Exchange Resin ◽  
Degradation Products ◽  
Higher Plant ◽  
High Acid Concentration ◽  
Wide Range ◽  
Quantitative Separation

Several current methods for the extraction and estimation of nucleic acids in biological materials were applied to Euglena and other plants. The efficiency of both the preliminary extractions for acid-soluble-P and lipid-P and the subsequent extraction of the nucleic acids was studied. A relatively high acid concentration (15% TCA) was required to directly extract all the acid-soluble phosphates. These conditions appeared to remove a small amount of the RNA. Lower acid concentrations as used in the Ogur–Rosen method (2% PCA) failed to extract all the acid-soluble phosphates. By using a modification of the Ogur–Rosen initial extraction method, the acid-soluble phosphates were quantitatively extracted without loss of RNA. After removal of the acid-soluble phosphates and lipid phosphates, the plant nucleic acids were quantitatively extracted by either the Schmidt–Thannhauser or Schneider methods. In many of the plants tested, the presence of pentose-containing polysaccharides, protein degradation products, or polyphosphate (algae only) interfered in estimations based on either the Schneider or Schmidt–Thannhauser procedures. Such interfering substances in the Schmidt–Thannhauser method were eliminated by the use of an anion exchange resin. Details are given of a modified Schmidt–Thannhauser procedure which should be suitable for a wide range of plants. The modified procedure may be simplified for Euglena and some higher plant tissues depending on the nature and quantities of interfering substances present. Methods are also given for the quantitative separation of plant RNA nucleotides by paper chromatography and by ion exchange paper chromatography.

scholarly journals Fast Recovery of Lead from Hydrochloric Acid via a Novel Silica-Supported Anion Exchange Resin for the Determination of 210Pb in Environmental Samples

2020 ◽  
Author(s):  
Lifeng Chen ◽  
Jie Zhang ◽  
Xianwen He ◽  
Manqing Liu ◽  
Qiuyang Wei ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Environmental Samples ◽  
Adsorption Mechanism ◽  
Exchange Resin ◽  
Separation Efficiency ◽  
Anion Exchange Resin ◽  
Chemical Yield ◽  
Flow Speed ◽  
Exchange Capacity ◽  
Hcl Solution

The<b> </b>measurement of <sup>210</sup>Pb is significant in environmental studies. Lead separation in HCl solution is a vital procedure but suffers from poor efficiency with high labor and time costs. To overcome this problem, a novel anion exchange resin was synthesized and characterized by different techniques followed by studies on the adsorption behaviors towards lead in HCl solution. The results suggest that SiPS-N(CH<sub>3</sub>)<sub>3</sub>Cl was successfully prepared with small particle size, low water swelling rate, and large specific surface area. The maximum anion exchange capacity resulted from quaternary amine groups was determined to be 1.0 mmol (Cl<sup>-</sup>)/g.The adsorption activities reached equilibrium within 3 min under selected conditions offering extremely fast adsorption kinetics. The synergistic adsorption mechanism, the multilayer adsorption mechanism, and the competition from co-existing chloride anions were found to be responsible for the lead adsorption performance of SiPS-N(CH<sub>3</sub>)<sub>3</sub>Cl. Column experiments showed that the feeding volume of lead and HCl had impact on the chemical yield regardless of the co-existence of high concentrations of FeCl<sub>3</sub> (90 mM) and a high flow speed (4.0 mL/min). Based on these results, a separation process integrating SiPS-N(CH<sub>3</sub>)<sub>3</sub>Cl and the matched parameters was finally developed and tested. Our work greatly raised the lead separation efficiency in HCl solutions with implications for measuring <sup>210</sup>Pb in environmental samples.

scholarly journals Selective removal of specific anions using composite carbon electrodes coated with an anion-exchange resin powder

2021 ◽  
Vol 27 (1) ◽  
pp. 200650-0
Author(s):  
Ji-Won Son ◽  
Hyun-Cheul Roh ◽  
Jae-Hwan Choi
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Adsorption Equilibrium ◽  
Anion Exchange Resin ◽  
Ion Selectivity ◽  
Exchange Capacity ◽  
Selective Removal ◽  
Carbon Electrode ◽  
Mixed Solution ◽  
Composite Carbon

The selective removal of specific ions was explored by using a capacitive deionization (CDI) system with a selective composite carbon electrode (SCCE). An SCCE was manufactured by coating a carbon electrode with anion-exchange resin (AER) powders. The correlation between the characteristics of the AERs and ion selectivity was analyzed, and the ion selectivity of the SCCE was verified through CDI experiments with a mixed solution of chloride, nitrate, and sulfate ions. The adsorption equilibrium results of the AERs showed that the ion selectivity of an AER was greatly influenced by its ion-exchange capacity (IEC). The higher the IEC value was, the higher the selectivity for the divalent sulfate ion, whereas the smaller the IEC was, the higher the selectivity for the nitrate ion. The CDI experimental results show that the equivalent fraction of ions adsorbed to the SCCE was consistent with the result of the adsorption equilibrium test. Therefore, the ion selectivity of the SCCE was governed by the ion selectivity of the AER coated on the electrode surface. Notably, as the current density applied to the cell increased, the AER could not maintain an adsorption equilibrium state, which resulted in a decrease in the ion selectivity of the SCCE.

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