Relevant bibliographies by topics / Magnetic anion exchange resin

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Academic literature on the topic 'Magnetic anion exchange resin'

Author: Grafiati
Published: 3 June 2025
Last updated: 23 June 2025

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Journal articles on the topic "Magnetic anion exchange resin"

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Shuang, Chen Dong, Feng Yang, Yang Zhou, Peng Hui Li, and Ai Min Li. "Preparation and Characterization of Magnetic Strong-Base Anion Exchange Resin." Advanced Materials Research 239-242 (May 2011): 1838–41. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.1838.

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The magnetic copolymer was prepared by polymerization of glycidyl methacrylate (GMA) and divinylbenzene (DVB) in the presence of OA-modified magnetic nano-particles. The magnetic strong-base anion exchange resin (MAER) was formed by quaternization of magnetic copolymer. Transmission electron microscope (TEM) and scanning electron microscope (SEM) were used for observation of prepared magnetic nano-particle and MAER, respectively. FT-IR spectrometer was used to characterize the magnetic nano-particle and MAER. To explore the potential application of MAER for natural organic matter (NOM) removal, completely-mixed (CMC) mode was used for humic acid (HA) adsorption. It was found that the HA removal for CMC mode with MAER resin was 10~20% higher than conventional process before breakthrough.
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Liu, Cheng, Bin Wang, Yang Deng, Jie Wang, Wei Chen, and Yu Liu. "M-PGMA as a new water treatment agent to remove oxytetracycline from water." Water Supply 16, no. 2 (2015): 295–304. http://dx.doi.org/10.2166/ws.2015.134.

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Magnetic ion exchange resin is a strong base anion exchange resin with magnetic properties that can be used to remove negatively charged materials from water. Magnetic poly glycidyl methacrylate resin (m-PGMA), a new type of resin, has shown better removal performance for humics than MIEX®. Removal of oxytetracycline (OTC) in water by m-PGMA, and factors influencing the removal, were examined, and in addition, the removal of OTC by MIEX and powdered activated carbon (PAC) were used as a comparison. Results showed that m-PGMA could remove more OTC than MIEX and PAC. The removal performance was greatly affected by dosage of m-PGMA, inorganic anions, organics and pH value. At a contact time of 30 min, the removal rates of OTC were 45%, 52% and 63% when the dosage was 5 ml/L, 10 ml/L and 20 ml/L, respectively. In comparison the removal rate of OTC by MIEX was 45% with a dosage of 10 mL/L and a contact time of 30 min. The removal of OTC was significantly increased when the pH value was above 7.3, as the OTC molecule exists as an anion in alkaline medium. In conclusion, m-PGMA is more effective than MIEX and PAC in the removal of OTC in water, and can be one of the choices to remove trace organics like OTC.
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Li, Qiang, Baijun Wang, Wentao Li, et al. "Performance evaluation of magnetic anion exchange resin removing fluoride." Journal of Chemical Technology & Biotechnology 91, no. 6 (2015): 1747–54. http://dx.doi.org/10.1002/jctb.4764.

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Ma, Jian Wei, and Ya Rui Song. "Purification Raw Water by Magnetic Resin (MIEX)." Advanced Materials Research 726-731 (August 2013): 3185–88. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.3185.

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The objective of this research was to compare enhanced coagulation with anion exchange for removal of natural organic matter (NOM) and bromide. Treatment with a magnetic ion exchange resin (MIEX) was the primary focus of this study. The performance of the magnetic ion exchange resin,MIEX, in the treatment of raw water was investigated. MIEX can effectively remove UV-absorbing substances DOC. The removal of organic substances is accompanied by the elimination of other undesirable components, such as nitrogen and phosphorus. The optimal process parameters are at resin doses of 5-10 mL L1and contact time of 10-15 min, as determined via jartests. Based on this study, MIEX treatment is a suitable and efficient pretreatment method for the removal of extra dissolved organic matters and nitrates in raw water .
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Ma, Jian Wei, and Ya Rui Song. "Application of a Magnetic Resin (MIEX) in Raw Water." Applied Mechanics and Materials 361-363 (August 2013): 801–4. http://dx.doi.org/10.4028/www.scientific.net/amm.361-363.801.

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The objective of this research was to compare enhanced coagulation with anion exchange for removal of natural organic matter (NOM) and bromide. Treatment with a magnetic ion exchange resin (MIEX) was the primary focus of this study. The performance of the magnetic ion exchange resin,MIEX, in the treatment of raw water was investigated. MIEX can effectively remove UV-absorbing substances DOC. The removal of organic substances is accompanied by the elimination of other undesirable components, such as nitrogen and phosphorus. The optimal process parameters are at resin doses of 5-10 mL L1and contact time of 10-15 min, as determined via jartests. Based on this study, MIEX treatment is a suitable and efficient pretreatment method for the removal of extra dissolved organic matters and nitrates in raw water .
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Luo, Yuye, Cheng Liu, Siyuan He, Jiaqi Liu, and Yuanyuan Ren. "Release regularity and cleaning measures of magnetic anion exchange resin during application." Chemosphere 323 (May 2023): 138285. http://dx.doi.org/10.1016/j.chemosphere.2023.138285.

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Chen, Zhen, and Kong-Shuang Zhao. "Dielectric analysis of macroporous anion-exchange resin beads suspensions." Journal of Colloid and Interface Science 276, no. 1 (2004): 85–91. http://dx.doi.org/10.1016/j.jcis.2004.03.024.

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Zhen, Yuanhang, Tao Zhang, Bo Jiang, and Jingjing Chen. "Purification and Characterization of Resistant Dextrin." Foods 10, no. 1 (2021): 185. http://dx.doi.org/10.3390/foods10010185.

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In this study, an efficient method for the purification of resistant dextrin (RD) using membrane filtration and anion exchange resin decolorization was developed, then the purified RD was characterized. In the membrane filtration stage, suspended solids in RD were completely removed, and the resulting product had a negligible turbidity of 2.70 ± 0.18 NTU. Furthermore, approximately half of the pigments were removed. Static decolorization experiments revealed that the D285 anion exchange resin exhibited the best decolorization ratio (D%), 84.5 ± 2.03%, and recovery ratio (R%), 82.8 ± 1.41%, among all the tested resins. Under optimal dynamic decolorization conditions, the D% and R% of RD were 86.26 ± 0.63% and 85.23 ± 0.42%, respectively. The decolorization efficiency of the D285 resin was superior to those of activated carbon and H2O2. Moreover, the chemical characteristics and molecular weight of RD did not change significantly after purification. The nuclear magnetic resonance spectroscopy of RD showed the formation of new glycosidic linkages that are resistant to digestive enzymes. The superior water solubility (99.14%), thermal stability (up to 200 °C), and rheological properties of RD make it possible to be widely used in food industry.
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Shuang, Chendong, Fei Pan, Qing Zhou, Aimin Li, Penghui Li, and Weiben Yang. "Magnetic Polyacrylic Anion Exchange Resin: Preparation, Characterization and Adsorption Behavior of Humic Acid." Industrial & Engineering Chemistry Research 51, no. 11 (2012): 4380–87. http://dx.doi.org/10.1021/ie201488g.

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Hu, Xuewei, Kai Chen, Xinke Lai, Qi Yao, Siping Ji, and Kevin Kaiser. "Treatment of pretreated coal gasification wastewater (CGW) by magnetic polyacrylic anion exchange resin." Journal of Environmental Chemical Engineering 4, no. 2 (2016): 2040–44. http://dx.doi.org/10.1016/j.jece.2016.02.018.

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Dissertations / Theses on the topic "Magnetic anion exchange resin"

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Less, John Ryan. "Comparison of Natural Organic Matter (NOM) Removal Processes on Disinfection Byproduct (DBP) Formation During Drinking Water Treatment." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1293217404.

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Leung, B. K.-O. "An investigation into the recovery of precious metals utilising a novel anion exchange resin." Thesis, University of Reading, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374957.

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Rustum, Fawaz. "Removal of PFASs and Uranium from Drinking Water Using SorbixTM Anion Exchange Resin : Effects of Sodium Chloride on the Removal Efficiency." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-85423.

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The increasing awareness towards PFAS pollution makes it increasingly important to treat. Many agencies over the globe, including the Swedish Food Agency, are introducing ever so strict control over PFASs in drinking water. One of Norrvatten’s back-up drinking water plants, the Hammarby plant, is a groundwater plant that saw elevated concentrations of PFASs (sum of 32 PFASs~80 ng/L) and total uranium (~109 µg/L). The aim of this work is to investigate the possible remediation for PFAS and uranium pollution in the groundwater. The main objective is to examine the possibility of SorbixTM, a strong-base anion exchange resins provided by ETC2, adsorbing PFAS and uraniumfrom the groundwater. Furthermore, the optimal solution of groundwater and sodium chloride that prevents microbial growth is to be investigated. This is of interest considering the intermittent operation of the Hammarby plant, where water would be allowed to stagnant for longer periods thus being prone to microbial growth. The effect of microorganisms on the resins is of concern. Biogrowth experiments were conducted using four different brines: 0%, 5%, 15%, and 25%. Identical masses of AIX resins were soaked in these solutions for 19-29 days in order to investigate whether the brine is effective at inhibiting biogrowth. The tests were analyzed mainly using plate count method, and secondly using flow cytometry. For uranium and PFAS removal, batch experiments using (1) resins that were previously soaked in brine were performed, (2) resins that were exposed to microorganisms as well as (3) new unused resins. Results showed that brines with 15% salinity or higher are capable of completely stopping microbial growth. The SorbixTM was capable of removing PFAS to below detection levels, as well as 99% removal of total uranium. To further develop on this study, column experiments with continuous water flow should be investigated. Continuous flow is a more accurate representation of the real case and will give knowledge on additional information regarding the breakthrough volume of the individual PFASs, the required water flow relative to available resin area that ensures acceptable removals, and how the competitiveness of uranium affects PFAS adsorption. It is also recommended to investigate the potential for regenerating the AIX resins. The Swedish Food Agency restricts the chemicals that are allowed to come in contact with any drinking water equipment. This means that some of the regenerative substances used in other studies are prohibited in Sweden.<br>Den växande uppmärksamheten kring PFAS gör det allt viktigare att avlägsna dessa från dricksvatten. Flera myndigheter över hela världen, inklusive Livsmedelsverket, inför gränsvärden och kontroller på PFAS i dricksvatten som blir allt striktare. En av Norrvattens reservvattenverk, Hammarby, är en grundvattenanläggning som visade förhöjda koncentrationer av PFAS och uran, där summan av de 32 mest förekommande PFASs är 80 ng/L och den totala uranhalten är 109 µg/L. Syftet med detta arbete är att undersöka möjligheten till PFAS och uran borttagning från grundvattnet. Huvudmålet är att undersöka möjligheten för SorbixTM, en starkbasisk anjonbytesharts som är framtagen av ETC2 Sverige (ETC2, n.d.), att adsorbera PFAS och uran från grundvattnet. Dessutom ska den optimala lösningen av grundvatten och natriumklorid, som förhindrar mikrobiell tillväxt, undersökas. Detta är av intresse med tanke på den intermittenta driften av Hammarby-anläggningen, där vattnet i ledningarna är stillastående under längre perioder och därmed blir utsatt för mikrobiell tillväxt. Effekten av mikroorganismer på jonbytesharts är, enligt andrastudier, bekymmersam. Tillväxtexperimenten utfördes genom användning av fyra olika saltlösningar: 0%, 5%, 15%och 25%. Identiska massor av anjonbytesharts blötlades i dessa lösningar i 19-29 dagar för att undersöka biologisk tillväxt. Testerna analyserades huvudsakligen med tre-dagars-tillväxt och imindre utsträckning med flödescytometri.För uran- och PFAS-avlägsnande så användes standardiserad skaktester med (1) jonbytesharts somtidigare blötlagts i saltvatten, (2) jonbytesharts som exponerats för mikroorganismer samt (3) nytt och oanvänt jonbytesharts. Resultatet visade att lösningar med 15% salthalt eller högre kan bromsa den mikrobiella tillväxten helt. SorbixTM lyckades ta bort PFAS till under detektionsnivåer, samt avlägsnade över 99% av den uppmätta uranen i grundvattnet. För vidare studier så rekommenderas kolonnförsök med kontinuerligt vattenflöde. Kontinuerligt flöde är en mer exakt representation av det verkliga fallet och kommer att ge ytterligare information såsom: breakthrough volymen för de enskilda PFASs, optimala vattenflödet i förhållande till tillgänglig yta av jonbytesharts som säkerställer acceptabel avlägsnande samt hur stark konkurrensen mellan uran och PFAS blir och vilken av de som adsorberas/desorberas först. Dessutom rekommenderas undersökningar på regenereringen av jonbytesharts, med tanke till de begränsade regenereringsämnen som är tillåtna enligt Livsmedelsverket. Många regenerativa ämnensom används i andra studier är förbjudna att använda i Sverige.
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Zainal-Abidin-Murad, Sumaiya. "Production of biodiesel from used cooking oil (UCO) using ion exchange resins as catalysts." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10276.

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This study focuses on the development of novel two-stage esterification-transesterification synthesis of biodiesel from used cooking oil (UCO) using novel heterogeneous catalysts. The esterification of the UCO was investigated using three types of ion exchange resins catalysts including Purolite D5081, Purolite D5082 and Amberlyst 15. Of all the catalysts investigated, Purolite D5081 resin showed the best catalytic performance and was selected for further optimisation studies. From the optimisation study, it was found that the external and internal mass transfer resistance has negligible effect on the esterification reaction. At the optimum reaction conditions, Purolite D5081 achieved 92% conversion of FFA. During reusability study, the conversion of FFA dropped by 10% after each cycle and it was found that progressive pore blockage and sulphur leaching were dominant factors that decreased the catalytic performance of the Purolite D5081 catalyst. A kinetic modelling for FFA esterification was carried out using Purolite D5081 as a catalyst. Three types of kinetic models were investigated i.e. pseudo homogeneous (PH), Eley-Rideal (ER) and Langmuir-Hinshelwood-Hougen-Watson (LHHW). Experimental data obtained from the batch kinetic studies was successfully represented by the PH model and a good agreement between experimental and calculated values was obtained. The activation energy for esterification and hydrolysis reaction was found to be 53 and 107 kJ/moL. The transesterification of pre-treated cooking oil (P-UCO) was investigated using various types of heterogeneous catalysts including Purolite CT-122, Purolite CT-169, Purolite CT-175, Purolite CT-275, Purolite D5081, Diaion PA306s and Cs-supported heteropolyacids catalysts. Of all the catalysts investigated, Diaion PA306s catalyst showed the highest conversion of triglycerides and was selected for further optimisation studies. At the optimum reaction conditions, Diaion PA306s achieved ca. 75% of triglycerides conversion. During the reusability study, Diaion PA306s catalyst gave a similar conversion of triglycerides after being reused once. Therefore, it was concluded that the resin can be used several times without losing catalytic activity. Several purification methods have been investigated and dry washing method was chosen as the best alternative for biodiesel purification.
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Schwer, Patrick Thomas. "The use of magnetic ion exchange resin (MIEX) for the removal of natural organic matter (NOM) and bromide from estuarine waters." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1433518.

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Filho, Luiz Francisco da Silva Souza. "Formas de fósforo em Latossolo sob Cerrado em função do tempo de uso agrícola." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-15092014-122604/.

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Não há dúvidas que a exitosa exploração do Cerrado só foi possível graças às pesquisas que desenvolveram tecnologias de correção e adubação específicas para esse ambiente. Apesar de estar consolidado como um dos principais ambientes de produção agropecuária do mundo, as pesquisas devem avançar contribuindo, cada vez mais, com aumento na eficiência do uso do fósforo (P), por ser o elemento mais limitante para produção agrícola nesse ambiente. Devido às características dos solos dessa região, parte do P aplicado é retido pelo solo em formas que as plantas não conseguem absorver, resultando na acumulação de quantidades significativas do nutriente no solo. Apesar de não ser um assunto relativamente novo e do grande número de trabalhos, o tema avaliação da disponibilidade de fósforo do solo ainda provoca dúvidas. Além dos estudos em que é avaliada a eficiência de diversos extratores como Mehlich-1 e resina de troca aniônica, outras técnicas passaram a ser utilizadas para esse fim. Estudos objetivando avaliar a distribuição (dinâmica) do fósforo nas diferentes frações do solo e as mudanças nessa distribuição em função do manejo aplicado aos cultivos e, também, do tempo de cultivo, têm sido conduzidos com crescente intensidade. Estudos também têm sido conduzidos buscando identificar as formas de acumulação de P no solo. Para isso, modernas técnicas espectroscópicas, como por exemplo, a espectroscopia baseada em luz synchrotron, têm sido utilizadas como uma poderosa ferramenta, auxiliando na identificação dos compostos presentes no solo. Face ao exposto, objetivou-se avaliar as alterações no fósforo disponível e nas frações e formas de fósforo em solo de Cerrado submetido ao manejo em semeadura direta com diferentes tempos de cultivo. Foram coletadas amostras compostas em quatro áreas que se encontravam no momento da coleta com 5, 8, 12 e 18 anos de cultivo desde a abertura das áreas, e também numa área sob vegetação nativa. O fósforo disponível foi extraído por Mehlich-1 e resina de troca aniônica. As amostras foram submetidas ao fracionamento químico de fósforo e espectroscopia de alta resolução da borda de absorção (XANES - X-ray absorption near edge structure). Observou-se que, de maneira geral, os teores de fósforo no solo foram sempre mais altos nas áreas cultivadas, principalmente na camada superficial, em comparação aos da área com vegetação nativa, o que reflete o impacto das adubações fosfatadas. A aplicação superficial do fertilizante fosfatado gerou nítidos gradientes de P no perfil do solo, principalmente para as frações lábeis e moderadamente lábeis, sendo essas frações as que sofreram maior influência do fertilizante quando comparadas às frações de menor disponibilidade. Considerando-se os mesmos extratores, os teores das frações orgânicas foram maiores em comparação às correspondentes frações inorgânicas. As formas de fósforo nos solos estudados foram predominantemente associadas ao alumínio e ao ferro, com destaque para o nutriente associado ao alumínio, sendo que, com o ferro, a associação ocorreu predominantemente por meio de fenômenos de adsorção em detrimento de fenômenos de precipitação.<br>There is no doubt that the successful exploitation of the Cerrado was only possible due to the research that developed specific correction and fertilization technologies to this particular environment. Due to the characteristics of soils in the region, part of applied phosphorus (P) is retained by the soil in plant unavailable forms, resulting in accumulation of significant amounts of nutrient in the soil. Despite not being a relatively new issue and the large number of research performed on this topic, the assessment of the soil P availability still raise important questions. In addition to studies in which the efficiency of various extractants have been tested, such as Mehlich-1 and anion exchange resin, other techniques are being used for this purpose. Studies for evaluating the P distribution (dynamic) in different soil fractions and the changes in this fractions due to the management applied to crops and also the time of cultivation have been conducted with increasing intensity. Studies have also been carried out in order to identify the forms of P accumulation in soils. For this purpose, modern spectroscopic techniques such as spectroscopy based on synchrotron light source, have been used as a powerful tool, assisting in the identification of P compounds presents in the soil. The aims of this study were to evaluate the changes in available, fractions and forms of P in soils of Cerrado with different times under no-till cultivation system. Composite soil samples were collected in four areas under 5, 8, 12 and 18 years of no-till cultivation since the areas were opened, and also in a area under native vegetation. The soil in the area was classified as Typic Hapludox and the areas were cultivated alternating crops of soybeans, corn and cotton. Available P was extracted by Mehlich - 1 and anion exchange resin. The samples were subjected to Hedley´s chemical fractionation of P and X- ray absorption near edge structure (XANES). It was observed that, in general, the levels of P in the soil were always higher in cultivated areas, mainly in the topsoil, when compared to the area under native vegetation, which reflects the impact of phosphate fertilization. Surface application of phosphate fertilizer produced sharp gradients of P in the soil profile, especially for both labile and moderately labile fractions, and these fractions suffered the greatest influence of fertilizer compared to fractions of lower availability. Considering the same extractants, the organic P fractions contents were higher compared to the corresponding inorganic fractions. Forms of phosphorus in soils were predominantly associated with aluminum (Al) and iron (Fe), especially P associated with Al, and with Fe the association occurred predominantly through adsorption phenomenon rather than precipitation reactions.
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Zeitoun, Rawan. "Procédés de fractionnement de la matière végétale : application à la production des polysaccharides du son et de la paille de blé." Thesis, Toulouse, INPT, 2011. http://www.theses.fr/2011INPT0017/document.

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Le son et la paille de blé, riches en hémicelluloses, sont deux co-produits de la récolte de blé, abondants et renouvelables, mais qui restent à mieux valoriser. Dans le but d'extraire ces hémicelluloses, possédant plusieurs propriétés intéressantes (filmogènes, épaississantes, émulsifiantes, stabilisantes…), un procédé de fractionnement a été élaboré. Ce procédé consiste, après extraction alcaline, en la purification des extraits hémicellulosiques obtenus. Deux techniques ont été appliquées : l'ultrafiltration et la chromatographie sur résine échangeuse d'anions. L'ultrafiltration a permis de concentrer les extraits d'hémicelluloses et de les purifier en éliminant dans le perméat la plupart des molécules contaminantes, essentiellement les sucres libres et les sels minéraux. Les principales limitations de cette étape étaient la viscosité des extraits et les phénomènes de polarisation de concentration et de colmatage des membranes. La percolation sur résine, quant à elle, a permis de décolorer les extraits et de produire des poudres d'hémicelluloses plus claires en fixant certaines molécules colorées telles que les molécules possédant des groupements phénoliques. La combinaison des deux techniques a permis de produire des hémicelluloses pures à 60%. L'extrapolation du procédé à l'échelle pilote par l'utilisation d'un extrudeur bi-vis a permis d'obtenir des poudres d'hémicelluloses pures à 40%<br>Wheat bran and wheat straw are two by-products abundant and renewable, rich in hemicelluloses, but still not well valued. In order to extract these hemicelluloses characterized by their several interesting properties (film-forming, thickening, emulsifying, stabilizing…), a fractionation process was developed. This process consisted, after alkaline extraction, to purify the hemicellulosic extracts obtained. Two techniques were used: ultrafiltration and chromatography on anion exchange resin. The ultrafiltration allowed to concentrate the extracts and to purify them by removing in the permeate, the contaminating molecules, mostly free sugars and minerals. The main limiting factors of this stage were the extracts viscosity and the fouling of the membranes. The percolation on the resin discoloured the extracts and allowed to produce hemicellulosic powders with lighter colours and that by capturing the coloured compounds such as molecules with phenolic groups. The combination of the two techniques allowed the production of purified hemicelluloses; the purity was about 60%. The extrapolation of the process at a pilot scale using a twin-screw extruder allowed to obtain hemicelluloses with a purity of 40%
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Tchanque, Kemtchou Valéry. "Magnetit-Nanokomposite als Funktionspartikeln für die Bioseparation." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2014. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-156369.

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Die vorliegende Arbeit beschäftigt sich mit der Herstellung von funktionellen Magnetit-Nanokompositen durch Sprühtrocknung für die Anwendung in der Bioseparation. Dabei liegen die Schwerpunkte auf der Anwendung von Polyelektrolyten als Ionenaustauscher sowie auf der Nachhaltigkeit des Herstellungsprozesses. Basierend auf einem existierenden Herstellungsprozess wurde die Aufgabenstellung konkretisiert. Es wurden Möglichkeiten zur nachhaltigen Prozessgestaltung der Synthese von kationischen bzw. anionischen magnetischen Funktionspartikeln zur Proteinabtrennung vorgestellt. Als magnetische Komponente wurde Magnetit verwendet. Aufgrund seines pseudo-amphiphilen Charakters und seiner besonderen Eigenschaften in Bezug auf die Stabilisierung von Magnetit-Kolloiden wurde Polyvinylbutyral (Mowital B 30T) als Matrixpolymer bei der Sprühtrocknung benutzt. Für die nachhaltige Prozessgestaltung wurden Isopropanol und Tetrahydrofuran als Dichlormethan-Ersatz bei der Sprühtrocknung verwendet. Bei der Synthese kationischer Magnetic Beads wurden verzweigtes Polyethylenimin und lineares Poly(Allyamin) als Anionenaustauscher verwendet. Beide Polykationen sind schwache Polyelektrolyte mit Aminogruppen. Für die Verarbeitung der Polykationen als funktionelle Liganden in magnetischen Funktionspartikeln wurde zwei Herstellungsmethoden vorgestellt: eine Synthese ohne Oberflächenmodifizierung, wobei die mechanische und chemische Stabilität der Funktionspartikeln einzig von der chemischen Struktur der eingesetzten Materialien bzw. vom Matrixpolymer abhängt, und eine Synthese mit Oberflächenmodifizierung. Die Synthese mit Oberflächenmodifizierung ist gekennzeichnet durch die kovalente Bindung von Polyethylenimin bzw. Poly(Allyamin) an der Oberfläche der Funktionspartikeln (Polyvinylbutyral). Dafür wurde 1,1’-Carbonyldiimidazol als „zero length“-Crosslinker benutzt. Die nach beiden Methoden hergestellten Funktionspartikeln wurden charakterisiert, um ihre technische Eignung beurteilen zu können. Für die Charakterisierung der sorptiven Eigenschaften wurde unter anderem der Bowman-Birk Inhibitor (BBI) verwendet. Das Protein ist ein Sojaprodukt und für seine krebsvorbeugende Wirkung bekannt. Um die Selektivität der Abtrennung zu untersuchen, wurden BBI-Produkte mit unterschiedlichen Reinheitsgraden benutzt. Durch die zwei vorgestellten Methoden konnten kationische magnetische Funktionspartikeln erfolgreich hergestellt werden. Alle Funktionspartikeln sind superparamagnetisch, und der Medianwert ihrer Partikelgrößenverteilung liegt im einstelligen Mikrometerbereich. Aufgrund eines höheren Polykationanteils ist die Bindungskapazität der Funktionspartikeln ohne Oberflächenmodifizierung um den Faktor 2,4 größer als die BBI-Bindungskapazität der Funktionspartikeln mit Oberflächenmodifizierung (Qmax=322 mg/g). Das Fehlen eine feste Anbindung des funktionellen Liganden an den Funktionspartikeln ohne Oberflächenmodifizierung verleiht jedoch diesen eine sehr schlechte chemische Stabilität in Lösungen. Es wurde auch gezeigt, dass oberflächenmodifizierte Funktionspartikeln mit ähnlichen Eigenschaften durch den Einsatz von Dichlormethan bzw. Tetrahydrofuran als Lösungsmittelersatz während der Sprühtrocknung hergestellt werden können. Durch den Einsatz von mit Poly(allylamin) oberflächenmodifizierten Funktionspartikeln konnte BBI von technischen Sojamolken unterschiedlicher Reinheitsgrade erfolgreich abgetrennt werden. Anionische Magnetic Beads wurden mit Kationenaustauscherharz als funktionellem Ligand hergestellt. Dabei wurde Isopropanol als organisches Lösungsmittel während der Sprühtrocknung verwendet. Die Synthese wurde analog zur Synthese der kationischen Magnetic Beads ohne Oberflächenmodifizierung durchgeführt. Es wurde auch hier gezeigt, dass anionische magnetische Funktionspartikeln mit guten sorptiven Eigenschaften durch den Einsatz von Isopropanol als organisches Lösungsmittel hergestellt werden können. Die anionischen Funktionspartikeln besitzen im Vergleich zu Literaturwerten höhere Bindungskapazitäten (bis 280 mg/g; ermittelt mit Lysozym). Im letzten Kapitel wird der kritische Prozessschritt des Lösungsmittelaustausches behandelt. Nach dem Lösungsmittelaustausch sollten die Magnetitnanopartikeln in der organischen Phase stabil sein. Dies ermöglicht sowohl eine homogene Verteilung der Nanopartikeln in der Matrix als auch deren bessere Verkapselung während der Sprühtrocknung. Es wurde festgestellt, dass sich eine vollständige Abtrennung von Dichlormethan durch die angewendete Destillationsmethode nicht erreichen lässt. Anhand von zwei Modellsystemen — Rizinolsäure- und Ölsäure-beschichteten Magnetitnanopartikeln — und Lösungsmittelgemischen wurde die Stabilität von sterisch stabilisierten Magnetitpartikeln in binären Lösungsmittelgemischen untersucht. Der Fokus bei dieser Untersuchung lag auf der Untersuchung der Stabilität der beschichteten Magnetitnanopartikeln in einer möglichst Dichlormethan- bzw. Isooktan-freien organischen Phase. Als zweites Lösungsmittel (als Lösungsmittelersatz betrachtet) wurden neben Tetrahydrofuran und Isopropanol technisch verbreitete Lösungsmittel wie Isooktan und 1-Butanol eingesetzt. Die Untersuchungsergebnisse zeigen, dass die Anwendung der technischen Rizinolsäure bzw. Ölsäure einen zusätzlichen Einfluss auf die Stabilität der Magnetitpartikeln hat, da diese aus anderen Fettsäuren mit unterschiedlichen chemischen Strukturen bestehen. Die Diskrepanz zwischen der berechneten HANSEN-Distanzen und der Stabilität der Magnetitnanopartikeln mit reinen Fettsäuren lässt vermutet, dass die Zusammensetzung der Lösungsmittelgemische an der fest/flüssig-Grenzfläche anders ist als im freien Volumen. Ein Modell zur Beschreibung der Stabilität der Nanopartikeln, das auf einer Anreicherung des Ausgangslösungsmittels an der Grenzfläche basiert, wurde postuliert. Solange die Diffusion des zweiten Lösungsmittels in die Adsorptionsschicht nicht ausreichend genug ist, um die Löslichkeit der Fettsäureketten entscheidend zu reduzieren und somit einen Abfall der Abstoßungskräfte zwischen der Partikeln hervorzurufen, bleiben alle beschichteten Magnetitnanopartikeln stabil im Lösungsmittelgemisch. Dies ist der Fall für die mit der reinen Rizinolsäure beschichteten Magnetitnanopartikeln in allen verwendeten Lösungsmittelgemischen mit 0,5 Vol. % DCM in der kontinuierlichen Phase. Durch die vorgestellten Herstellungsmethoden wurde gezeigt, dass magnetische Funktionspartikeln sowohl mit festen partikelförmigen Ionenaustauschern als auch mit flüssigen schwachen Polyelektrolyten erfolgreich synthetisiert werden können. Eine nachhaltige Prozessgestaltung durch die Reduzierung der Dichlormethanmenge im Sprühtrocknungsprozess ist auch möglich. Für eine erfolgreiche industrielle Anwendung der Funktionspartikeln müssen aber ihre chemischen sowie mechanischen Eigenschaften deutlich verbessert werden. Dies könnte z.B. durch die Verwendung eines anderen Matrixpolymers oder durch die Entfernung von nicht gebundenen Bestandteilen durch gezielte Waschung der Funktionspartikeln erfolgen. Die Bindungskapazität sowie die Selektivität der oberflächenmodifizierten Funktionspartikeln sollte ebenfalls verbessert werden. Dafür wurde einen Ansatz durch die Quaternisierung der Aminogruppen präsentiert. Schließlich würde die Untersuchung der Stabilität der beschichteten Magnetitnanopartikeln in einphasigen reinen Lösungsmitteln nähere Erkenntnisse über das postulierte Modell der Anreicherung von Dichlormethan in der Adsorptionsschicht erbringen. Dabei könnte die Dichlormethanmenge durch mehrstufige Destillation bzw. Rektifikation beim Lösungsmittelaustausch entfernt werden. Eine vollständige Untersuchung dieses Effekts würde zusätzlich eine Antwort auf zahlreiche Fragestellungen der Kolloidchemie in Bezug auf das Stabilitätsverhalten von Pigmentdispersionen (Lacke) oder von beschichteten Nanopartikeln in Polymerlösungen erbringen.
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Huang, Run-Tun, and 黃榮通. "Binary Adsorption of Organic Solutes onto Anion Exchange Resin." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/87026054398802007003.

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博士<br>國立成功大學<br>化學工程研究所<br>83<br>Intraparticle diffusion is an important mass transfer step in an adsorption process. Both solid- and pore-diffusion models were widely applied to describe the process of intraparticle diffusion of porous adsorbents. An anion-exchange resin, Ion Exchanger II (Merck), was chosen as the adsorbent in this study. o-Cresol, benzoic acid, p-chlorophenol, and p- nitrophenol were used as adsorbates. Both the fixed-bed and the batch vessel werqe used as the adsorption systems . The equilibrium adsorption data of single adsorbate onto the anion exchange resin revealed that the adsorption of o-cresol, benzoic acid. There were large deviations if the data were corrected by Freundlich isotherms. Equilibrium data showed an approximately linear adsorption isotherm for o-cresol and a favorable one for benzoic acid. Equilibrium data of p- chlorophenol and p-nitrophenol were also nonlinear, but the isotherms were less favorable than benzoic acid. Accordingly, their Langmuir constants were smaller than that of benzoic acid. In modeling the binary adsorption of o-cresol-benzoic acid and p-chlorophenol-p-nitrophenol, an extended Langmuir isotherm showed evident deviations from the equilibrium data. However, the data could be well represented by the modified Langmuir is otherm with interacting factor extracted from experimental com- petitive isotherms. Experiments with the fixed beds were also performed to study the single-component adsorptions of o-cresol and benzoic acid . The experimental breakthrough data was modeled by both the solid- and the pore- diffusion models. When the shape of the adsorption isotherm was approximately linear (say, o-cresol), both models agreed well with the experimental breakthrough data, and they could be effectively applied to predict the breakthrough curve of longer columns. (omit)
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Kuo, Chin-Tian, and 郭錦添. "The Study of Immobilized Urease with Anion Exchange resin." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/52160044603518082469.

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碩士<br>國立成功大學<br>化學工程研究所<br>83<br>This study concerns the kinetic study on the removal of urea from aqueous solution with anionic exchanged resin . The kinet- -ics of urea hydrolysis catalyzed by free urease , the immobil- -ized urease , the binding of glutaraldehyde with carriers , as well as the reaction and transport phenomena of urease in the carriers are studied . Our conception is to use glutaraldehyde to be the bridge between carriers and urease , and makes their binding stable . The experiment is operated under 25 to 27 ℃ , and uses phosphate solution 0.1M to be as buffer . In free urea- -se system , we find that the best condition of urea hydrolysis catalyzed by free urease is at pH7.0 of the reaction system , and urea concentration is 0.2M . By the UV - VIS Spectrophotome- -ter can find the amount of glutaraldehyde and urease which bind with carriers . We use A510 and A400 resins to be the carr- iers of urease . The results of our experiment indicate that the amount of urease which A510 resin adsorbed is about four times of A400 resin , and the rate of urea hydrolysis catalyzed by A510 resin is about six times by A400 resin. In accordance with our results of experiment , the condition which immobilized urease has the best activity is : using A510 resin as carrier , the system of immobilized urease being operated at 25 ℃ , pH6.5 , the amount of glutaraldehyde bind- -ing with resin is 0.302 meq- ml^-1 resin , and urea concentr- -ation is 0.2M .
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Books on the topic "Magnetic anion exchange resin"

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Evaluation of an anion exchange resin for sampling ambient level phenolic compounds: Project summary. U.S. Environmental Protection Agency, Atmospheric Research and Exposure Assessment Laboratory, 1990.

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Book chapters on the topic "Magnetic anion exchange resin"

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Xu, Tongwen. "Anion-Exchange Resin." In Encyclopedia of Membranes. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_1420.

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Xu, Tongwen. "Anion-Exchange Resin." In Encyclopedia of Membranes. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-40872-4_1420-4.

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Gooch, Jan W. "Anion Exchange Resin." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_662.

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Emmett, J. R. "Anion Resin Kinetics at High Flow Rates." In Fundamentals and Applications of Ion Exchange. Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5161-7_6.

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Vaidya, S. V., S. S. Bapat, A. S. Kale, and S. V. Mokashi. "Weak Base Anion Exchange Resin: Simplification of AmiNation Process and Control on SBC." In Ion Exchange Advances. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2864-3_15.

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Song, Haiou, Aimin Li, and Yang Zhou. "Selective Removal of DOM on Anion-Exchange Resin from Water." In Functions of Natural Organic Matter in Changing Environment. Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5634-2_168.

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Li, Cui, Hong-Yi Li, Liang Wang, Sheng-Kai An, and Bing Xie. "Dynamic Adsorption Behaviour of Aqueous Vanadium onto Anion Exchange Resin." In Rare Metal Technology 2014. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118888551.ch32.

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Dash, Hirak Ranjan, Pankaj Shrivastava, and Surajit Das. "Extraction of DNA by Using Anion-Exchange Resin Chelex®." In Springer Protocols Handbooks. Springer US, 2020. http://dx.doi.org/10.1007/978-1-0716-0274-4_12.

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Kamo, Yoshiyuki, Masayoshi Uno, and Shinsuke Yamanaka. "Preparation of Metal Oxide Photocatalyst by Soft Solution Process with Anion Exchange Resin." In Ceramic Transactions Series. John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470538371.ch28.

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Pardasani, R. T., and P. Pardasani. "Exchange energy of dinuclear μ–oxo bridged ferric complex with o-iminobenzosemiquinonate π radical anion." In Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 1. Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-62478-4_458.

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Conference papers on the topic "Magnetic anion exchange resin"

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Kvasyuk, E. I., Y. N. Gretskaya, V. I. Yaroshevich, and M. А. Khancheuski. "SYNTHESIS OF SECO-DERIVATIVES OF ADENOSINE AND URIDINE." In SAKHAROV READINGS 2022: ENVIRONMENTAL PROBLEMS OF THE XXI CENTURY. International Sakharov Environmental Institute of Belarusian State University, 2022. http://dx.doi.org/10.46646/sakh-2022-1-212-216.

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The effectiveness of the different methods for transformation of the natural ribonucleosides adenosine 16 and uridine 17 into its nucleoside dialdehydes 18 and 19 was studied. NaIO4 and anion exchange resin Dowex 1x2 (100-200 mesh) in IO4_-form were used as a regents. The nucleoside dialdehydes 18 and 19 were obtained with the yield 70-83%. It was shown that the reaction of periodate oxidizing of ribonucleosides with anion exchange resin in IO4_-form has preference to the method which used NaIO4. Reaction of dialdehydes 18 and 19 with NaBH4 results in formation of nucleosides trioles 20 and 21 with 50 and 45% yields, respectively.
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Zhou, Yan, and Haifeng Zhang. "Design and Research of Spent Resin Conical Dryer Device." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66008.

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This paper introduced the design and research of spent resin conical dryer which was based on the analysis of the thermal decomposition characteristics of resins. The drying experiment of non-radioactive cation exchange resins and anion exchange resins was also carried out in this study. The result showed that the water content of resins reduced from about 55%(wt) to 8.5%(wt) and the volume reduction ration reached 2.17 with a drying end temperature of 90°C, which preliminarily verified the feasibility of the vacuum drying process and conical dryer device for treating radioactive spent resins.
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Baltaeva, M. B., A. M. Manakhov, D. K. Cha, and S. C. Ayirala. "Polymeric Waste-Based Ion-Exchange Resins: A Sustainable Solution for Produced Water Treatment." In SPE Water Lifecycle Management Conference and Exhibition. SPE, 2024. http://dx.doi.org/10.2118/219000-ms.

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Abstract One of the most crucial strategies for reducing the negative environmental effects of water production in oil operations is to identify innovative and cost-efficient techniques for purifying produced water while minimizing the amount of its disposal into the environment. The proposed solution for polymeric waste and its recycling into ion exchange resin allows the removal of monovalent ions from produced water. The obtained purified produced water can be utilized as injection water for waterflooding/smart water flooding or frac-water for unconventionals to contribute towards circular water economy in alignment with the Zero-Liquid-Discharge (ZLD) water management strategy. Discarded expanded polystyrene was selected as a viable substitute material source for ion exchange resins due to its abundance and low cost. Polymeric matrixes are made by collecting and dissolving polystyrene waste in an organic solvent, then forming beads using a microdroplet precipitation technique. A strongly basic anion-exchange resin (SBA) containing amine groups is produced using the amine plasma modification method combined with chemical treatment. Using the plasma sulfonation approach with surface treatment, a strongly acidic cation-exchange resin (SAC) with a high surface area and sulfonic groups is created. The SBA resin is utilized for sulfate-ions removal, while SAC can be applied to remove the sodium-ions. The polystyrene beads production process was scaled up using an in-house state-of-the-art encapsulator instrument. It has been demonstrated that achieving spherical beads without agglomeration requires the proper concentration of polystyrene waste and a filler in a solution. To increase surface area and functionalization efficiency, polystyrene beads were milled. The resultant porous beads are 300–750 microns in size. The performance of the resulting resin samples was analyzed according to industry standards using column tests. The optimal parameters of plasma sulfonation and chemical treatment procedures for SAC formation and plasma amination process for SBA creation were identified. The resins prepared from expanded polystyrene waste demonstrated effective capacity for both cation and anion exchange processes. More than 80% of the sodium ions and the sulfate ions in synthetic brine could be removed by the created strong-acidic cation-exchange and strong base anion-exchange resins, respectively. A new method of polymeric waste-based ion-exchange resins creation with characteristics similar to commercially available ion-exchange resins has been discovered. The development of these sustainable ion-exchange resins holds great promise for produced water treatment and recycle, providing an environmentally friendly and effective solution and reusing plastic waste.
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Kulyukhin, S. A., L. V. Mizina, and A. A. Tishina. "New Composite Materials for Decreasing of Radioactive Molecular Iodine in the Water Coolant on the Working and New Developed NPPS." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29006.

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The sorption of 131I−, 131IO3−, I2 and CH3131I from water solutions at 25°C on new composite materials obtained by modifying of cation-exchange resin KU-2 was investigated. It was established, that the given materials are capable to absorb I2 both from distilled water, and from a water coolant of the WWER-type NPPs, with distribution factors Kd more than 103 cm3/g at V/m = 100. Thus, it was found, that practically full I2 absorption (more than 95.0%) was achieved for 15 min. It was shown, that anion-exchange resin AV-18 is capable to adsorb CH3131I from a water solutions with distribution factors Kd more than 300 cm3/g at V/m = 100.
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Baltaeva, Madina, Maxim Orlov, Dong Kyu Cha, and Subhash Ayirala. "Sustainable Ion-Exchange Resins for Produced Water Treatment." In Middle East Oil, Gas and Geosciences Show. SPE, 2023. http://dx.doi.org/10.2118/213239-ms.

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Abstract Produced water is by far the largest by product by volume associated with oil and gas production. To minimize environmental impact of the produced water disposal, reuse produced water, and fulfill the targeted Zero-Liquid-Discharge approach, it is necessary to develop new economically viable technologies for water purification. The objectives of the research enclose development of the sustainable ion-exchange resin from the discarded expanded polystyrene via a multi-stage process with plasma treatment. The process of sustainable ion-exchange resins’ preparation includes several consecutive steps. At first, a polystyrene waste is collected and dissolved in an organic solvent.After that the polymeric beads are prepared using a microdroplet precipitation mechanism. Then, one part of the polystyrene beads is modified with the green gas-liquid interfacial plasma (GLIP) sulfonation process producing a strong acidic cation exchange resin. The other part is functionalized by amine groups in cyclopropylamine medium producing strong basic anion exchange resin. Robust and self-sustained process for creating the polystyrene beads was developedusing the «solvent-non-solvent» system. The bead formation process is realized by a controlled, laminar liquid jet broken into equally sized beads by vibrations at optimized frequency value. This process was performed using the in-house state-of-the-art encapsulator instrument. The concentration of waste expanded polystyrene and a filler in a solution was optimized. The size of obtained porous beads was measure around 750-1000 micron and can be controlled by the nozzle size and frequency of vibration. The research describes a new method of sustainable ion-exchange resin creation. The utilization of this novel material is a beneficial approach to re-use plastic waste and reuse it to clean produced water from dissolved salts. Moreover, plasma technology that is used for polystyrene treatment is probably the most versatile surface treatment technique and, moreover, it is environmentally friendly.
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Hong, Xu. "Influence of Feedwater TOC on Steam Cation Conductivity." In ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/power-icope2017-3023.

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The cation conductivity in water-steam cycle has been significantly increased as external heating units presented on trends in large capacity and high parameters. Real test has been carried out to demonstrate the TOC concentration in feedwater has been increased as the external heating increases. The presence of organic acid would significantly reduce the pH of the condensate and result in general corrosion, pitting and environment assisted cracking. For the cogeneration thermal power stations in which make-up water were produced with traditional ion exchange system and Integrated Membrane Technology separately, the main factors affecting cation conductivity of steam are residues of the organics in raw water and dynamic variation about bacterial reproduction in reducing environment, respectively. If gel type anion resin had been replaced with macroporous strong base anion resin, the remaining TOC in traditional ion exchange system could be significantly reduced. And if non-oxidative bactericide had been dosed before or after Ultrahigh Purity Filter, bacteria could be effectively killed. For heat-supply units, the actual rates of makeup water, denote with “N%”, are always more than the design value. So it is very important in this scenario to revise the ceiling values of TOC for makeup water, which should be divided by N, to allow that ceiling value to match the actual rate of makeup water. For drum boilers and once-through boilers which superheated steam pressure are greater than 18.3 MPa, in order to guarantee the cation conductivity (25 °C) values of feed water less than the standard of 0.10 μ S/cm, TOC values in feed water should be under 50μ g/L.
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Wu, Xuehui, and Li Li. "Notice of Retraction: Study on Strengthening of External Magnetic Field to Softening Hard Water Using Magnetic Ion Exchange Resin." In 2011 5th International Conference on Bioinformatics and Biomedical Engineering. IEEE, 2011. http://dx.doi.org/10.1109/icbbe.2011.5781162.

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Enascuta, Cristina-Emanuela, Elena-Emilia Oprescu, Catalina Calin, Gabriel Vasilievici, and Cristina Popa. "ADSORPTION OF NITRATE ON MAGNETIC MICROALGAL BIOCHAR." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/6.1/s25.07.

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The presence of nitrate concentration in drinking water can cause high toxicity to the human body, being considered among the most important pollutant in the environment. Among the many methods available such as biological treatment, electrodialysis, reverse osmosis, adsorption, ion exchange, adsorption is the most used technique due to its low cost and simplistic design. Therefore, the aim of this paper was to study the retention of nitrate anion from high concentration aqueous solutions on a novel magnetic adsorbent obtained by pyrolysis of de-oiled microalgal biomass. The prepared adsorbent was characterized by textural analysis (specific surface area, pore volume, average pore diameter, pore size distribution), FT-IR and TGA techniques. The influence of nitrate concentration, pH, retention time and adsorbent mass were evaluated. The equilibrium adsorption data were fitted to three isotherms, namely Langmuir, Freundlich and Temkin. The equilibrium isotherms indicate a pH-dependent behavior, characterized by Temkin model at pH=7 and Freundlich model at pH = 9, respectively. In order to estimate the nitrate removal efficiency multiple linear regressions and artificial neural networks were investigated.
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Paviet-Hartmann, Patricia, Amber Wright, Edward Mausolf, Keri Campbell, and Frederic Poineau. "Application of Formohydroxamic Acid in Nuclear Processing: Synthesis and Complexation With Technetium-99." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29028.

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Acetohydroxamic acid (AHA) is an organic ligand planned for use in the Uranium Extraction (UREX) process. It reduces neptunium and plutonium, and the resultant hydrophilic complexes are separated from uranium by extraction with tributyl phosphate (TBP) in a hydrocarbon diluent. AHA undergoes hydrolysis to acetic acid which will impede the recycling of nitric acid. During recent discussions of the UREX process, it has been proposed to replace AHA by formohydroxamic acid (FHA). FHA will undergo hydrolysis to formic acid which is volatile, thus allowing the recycling of nitric acid. The reported reduction potentials of AHA and pertechnetate (TcO4−) indicated that it may be possible for AHA to reduce technetium, altering its fate in the fuel cycle. At UNLV, it has been demonstrated that TcO4− undergoes reductive nitrosylation by AHA under a variety of conditions. The resulting divalent technetium is complexed by AHA to form the pseudo-octahedral trans-aquonitrosyl (diacetohydroxamic)-technetium(II) complex ([TcII(NO)(AHA)2H2O]+). In this paper, we are reporting the synthesis of FHA and its complex formation with technetium along with the characterization of FHA crystals achieved by NMR and IR spectroscopy. Two experiments were conducted to investigate the complexation of FHA with Tc and the results were compared with previous data on AHA. The first experiment involved the elution of Tc from a Reillex HP anion exchange resin, and the second one monitored the complexation of technetium with FHA by UV-visible spectrophotometry.
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Denton, Mark S., and William D. Bostick. "Downselect Ion Specific Media (ISM) Utilization in Upset and Outage Conditions." In The 11th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2007. http://dx.doi.org/10.1115/icem2007-7187.

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This paper presents a process that has been used to help nuclear power plant (NPP) clients resolve some of their more challenging waste water processing issues. These treatment issues may become even more evident during outage conditions, due (in part) to associated decontamination activities that may cause off-normal chemical conditions, which may subsequently change both the peak levels of activities for radionuclides introduced into the collected waste water and also the chemical forms in which they may exist (e.g., formation of colloids or soluble chelates). In one NPP waste processing example, a large proportion of soluble Co-58, which is normally present as a soluble cationic species or an uncharged colloidal solid, was found to behave like an anion; formation of an anionic chelation complex was implicated, possibly due to suspect EDTA, or similar additive, in a proprietary decontamination soap formulation. Antimony 125 (Sb-125), normally present as a weakly anionic (Sb(OH)6−) or even neutral (Sb(OH)30) species, was being displaced from previously-loaded media by other, more strongly bound species, causing an unacceptable peak activity in water intended for discharge. A quick resolution of the existing waste processing limitations was required, due to limited waste water holding capacity. Samples of the authentic NPP waste water containing the recalcitrant radionuclides were sent to our licensed off-site laboratory (MCLinc), where small-scale batch-equilibrium testing was used to down-select, from a large number (36) of candidate media (both commercially available and developed internally), those that were relatively effective and economical for use in achieving the required discharge criteria. Batch-equilibrium testing is very efficient for use in screening the relative effectiveness of contaminant removal by candidate media in a select waste water composition, and can also provide an estimate of the ultimate contaminant loading capacities on the candidate media; however, equilibrium testing does not provide information on the exchange kinetics and the shape of the packed column breakthrough isotherm. The performance of the most promising of the pre-screened media was then further tested and validated at the NPP site, using small packed bed columns containing the media to be evaluated, with use of actual NPP waste water under dynamic flow conditions. In the cited example, dynamic flow testing validated the performance characteristics for the most promising media, as previously-selected by the laboratory batch testing. In particular, it revealed that two novel media were particularly useful under process upset conditions, viz., AGC-5860 (a chemically modified activated carbon) for chelated transition metals (especially Co-58 &amp; 60), and ASM-125 (a highly selective and tenacious resin product) especially for Sb-125. Subsequently, two of the most effective novel media identified in the screening effort have now been deployed at full-scale at an NPP site for the duration of approximately one year (to-date). The antimony-selective resin has performed especially well, greatly outperforming and outlasting previously utilized media, under many variations in the NPP influent waste water composition (including outage conditions and high boron concentrations, etc.). It was further found that the ASM 125 ISM had an excellent affinity for tellurium (Te 125m), a daughter of antimony (Sb). (See data from Exelon’s Byron Station. Also, on-going at Calvert Cliffs). At the request of two other NPPs (STP and Calvert Cliffs), the AGC ISM was found to solve their Fe 55 and Ni 63 problem, likely resulting from steam generator changeouts at the plants. Lastly, work is on-going remove radioactive iodine (I 129) with the granulated AGC.
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Reports on the topic "Magnetic anion exchange resin"

1

Sheth, A. C., S. D. Strevel, and R. Dharmapurikar. Anion-exchange resin-based desulfurization process. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/5099554.

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Sheth, A. C., and S. D. Strevel. Anion-exchange resin-based desulfurization process. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/5245526.

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Sheth, A. C., and S. D. Strevel. Anion-exchange resin-based desulfurization process. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/6011489.

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4

Sheth, A. C., and S. D. Strevel. Anion-exchange resin-based desulfurization process. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/6180905.

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Sheth, A. C., and R. Dharmapurikar. Anion-exchange resin-based desulfurization process. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/7095685.

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Sheth, A. C., S. D. Strevel, and R. Dharmapurikar. Anion-exchange resin-based desulfurization process. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/7102863.

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Sheth, A. C., S. D. Strevel, and R. Dharmapurikar. Anion-exchange resin-based desulfurization process. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/6940657.

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Sheth, A. C., R. Dharmapurikar, and S. D. Strevel. Anion-exchange resin-based desulfurization process. Final report. Office of Scientific and Technical Information (OSTI), 1994. http://dx.doi.org/10.2172/10135310.

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Kyser, E. A. Plutonium Loading onto Reillex HPQ Anion Exchange Resin. Office of Scientific and Technical Information (OSTI), 2001. http://dx.doi.org/10.2172/773118.

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10

Rasmussen, Hope, Jared Stritzinger, Michael Heidlage, et al. Nitrated Anion Exchange Resin Disposal Plan Calcination Studies. Office of Scientific and Technical Information (OSTI), 2025. https://doi.org/10.2172/2523960.

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