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Anion exchange resin

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https://www.readbyqxmd.com/read/28427006/regeneration-of-pilot-scale-ion-exchange-columns-for-hexavalent-chromium-removal
#1
Julie A Korak, Richard Huggins, Miguel Arias-Paic
Due to stricter regulations, some drinking water utilities must implement additional treatment processes to meet potable water standards for hexavalent chromium (Cr(VI)), such as the California limit of 10 μg/L. Strong base anion exchange is effective for Cr(VI) removal, but efficient resin regeneration and waste minimization are important for operational, economic and environmental considerations. This study compared multiple regeneration methods on pilot-scale columns on the basis of regeneration efficiency, waste production and salt usage...
March 9, 2017: Water Research
https://www.readbyqxmd.com/read/28417455/an-efficient-process-for-obtaining-of-prebiotic-oligosaccharides-derived-from-lactulose-using-isomerised-and-purified-whey-permeate
#2
Carlos Sabater, Agustín Olano, Marin Prodanov, Antonia Montilla, Nieves Corzo
BACKGROUND: One of the most promising uses of whey permeate (WP) is the synthesis of prebiotic oligosaccharides. Herein, commercial WP was submitted to chemical isomerisation catalysed by sodium borate at an alkaline pH and subsequent purification using anion-exchange resins to remove boron. Afterwards, purified mixtures were used to synthesise prebiotic oligosaccharides using β-galactosidase from Bacillus circulans. RESULTS: Isomerisation of concentrated WP (200 g L(-1) lactose) gave rise to levels of lactulose up to 155...
April 18, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28398709/continuous-desalting-of-refolded-protein-solution-improves-capturing-in-ion-exchange-chromatography-a-seamless-process
#3
Nicole Walch, Alois Jungbauer
Truly continuous biomanufacturing processes enable an uninterrupted feed stream throughout the whole production without the need for holding tanks. We have utilized microporous anion and cation exchangers into which only salts, but not proteins, can penetrate into the pores for desalting of protein solutions, while diafiltration or dilution is usually employed for feed adjustments. Anion exchange and cation exchange chromatography columns were connected in series to remove both anions and cations. To increase operation performance, a continuous process was developed comprised of four columns...
April 11, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28391947/adsorption-behavior-of-benzenesulfonic-acid-by-novel-weakly-basic-anion-exchange-resins
#4
Yue Sun, Peng Zuo, Junfen Luo, Rajendra Prasad Singh
Two novel weakly basic anion exchange resins (SZ-1 and SZ-2) were prepared via the reaction of macroporous chloromethylated polystyrene-divinylbenzene (Cl-PS-DVB) beads with dicyclohexylamine and piperidine, respectively. The physicochemical structures of the resulting resins were characterized using Fourier Transform Infrared Spectroscopy and pore size distribution analysis. The adsorption behavior of SZ-1 and SZ-2 for benzenesulfonic acid (BA) was evaluated, and the common commercial weakly basic anion exchanger D301 was also employed for comparison purpose...
April 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28391925/removal-of-perfluorinated-surfactants-from-wastewater-by-adsorption-and-ion-exchange-influence-of-material-properties-sorption-mechanism-and-modeling
#5
Falk Schuricht, Ekaterina S Borovinskaya, Wladimir Reschetilowski
Perfluorooctane sulfonate (PFOS) has attracted increasing concern in recent years due to its world-wide distribution, persistence, bioaccumulation and potential toxicity. The influence of sorbent properties on the adsorptive elimination of PFOS from wastewater by activated carbons, polymer adsorbents and anion exchange resins was investigated with regard to their isotherms and kinetics. The batch and column tests were combined with physicochemical characterization methods, e.g., N2 physisorption, mercury porosimetry, infrared spectroscopy, differential scanning calorimetry, titrations, as well as modeling...
April 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28390480/a-simple-and-rapid-method-for-isotopic-analysis-of-nickel-copper-and-zinc-in-seawater-using-chelating-extraction-and-anion-exchange
#6
Shotaro Takano, Masaharu Tanimizu, Takafumi Hirata, Ki-Cheol Shin, Yusuke Fukami, Katsuhiko Suzuki, Yoshiki Sohrin
Stable isotope ratios of nickel, copper, and zinc are powerful tools for elucidating the biogeochemical cycling of trace metals in the ocean. However, analytical difficulties have impeded isotopic studies of these metals. We present a simple and rapid method for simultaneous analysis of Ni, Cu, and Zn isotope ratios in seawater using NOBIAS Chelate-PA1 resin and anion exchange resin. A NOBIAS Chelate-PA1 resin column was used to quantitatively collect Ni, Cu, and Zn from seawater and thoroughly remove the seawater matrix...
May 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28389094/monoclonal-antibody-fragment-removal-mediated-by-mixed-mode-resins
#7
Ellen O'Connor, Matthew Aspelund, Frank Bartnik, Mark Berge, Kelly Coughlin, Mutsa Kambarami, David Spencer, Huiming Yan, William Wang
Efforts to increase monoclonal antibody expression in cell culture can result in the presence of fragmented species requiring removal in downstream processing. Capto adhere, HEA Hypercel, and PPA Hypercel anion exchange/hydrophobic interaction mixed mode resins were evaluated for their fragment removal capabilities and found to separate large hinge IgG1 antibody fragment (LHF) from monomer. Removal of greater than 75% of LHF population occurred at pH 8 and low conductivity. The mechanism of fragment removal was investigated in two series of experiments...
April 4, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28363158/evaluation-of-the-separation-and-purification-of-227-th-from-its-decay-progeny-by-anion-exchange-and-extraction-chromatography
#8
P I Ivanov, S M Collins, E M van Es, M García-Miranda, S M Jerome, B C Russell
Thorium-227 is currently undergoing evaluation as a potential radionuclide for targeted cancer therapy, and as such a high chemical purity of the material is required. To establish a reliable procedure for radiochemical isolation of (227)Th from the parent (227)Ac and decay progeny, which includes the radiotherapeutic (223)Ra, the performance of three different separation schemes based on ion-exchange and extraction chromatography have been evaluated. The results suggest that both ion exchange and extraction chromatographic techniques can be successfully used for the separation of (227)Th from its decay progeny, however extraction chromatographic resins demonstrate favourable performance in terms of Th recovery and purification from radionuclide impurities...
March 23, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28355586/simultaneous-removal-of-thallium-and-chloride-from-a-highly-saline-industrial-wastewater-using-modified-anion-exchange-resins
#9
Huosheng Li, Yongheng Chen, Jianyou Long, Daqian Jiang, Juan Liu, Sijie Li, Jianying Qi, Ping Zhang, Jin Wang, Jian Gong, Qihang Wu, Diyun Chen
Simultaneous removal of thallium (Tl) and chloride from a highly saline industrial wastewater was investigated using modified anion ion exchange resins. The removal of thallium was mainly driven by the exchange of Tl-chlorocomplex (TlCl4(-)) formed in the oxidation of thallous (Tl (I)) to thallic ion (Tl (III)) by hydrogen peroxide (H2O2) under saline conditions. Over 97% of thallium and chloride removal was achieved using the modified resins, with a wide optimal conditions found to be H2O2 dosage 1.0-25.0mL/L, pH 1...
March 11, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28341379/the-rapid-adsorption-microbial-reduction-of-perchlorate-from-aqueous-solution-by-novel-amine-crosslinked-magnetic-biopolymer-resin
#10
Wen Song, Baoyu Gao, Hailan Wang, Xing Xu, Moxi Xue, Minchao Zha, Bo Gong
The aim of this work was to study the adsorption characters of resin, microbial reduction of perchlorate and combined process of perchlorate removal in aqueous solution. Study demonstrated the adsorption equilibrium was achieved in 120min, which based on ion exchange reaction. Dissolved perchlorate (100mg/L) can be completely removed by acclimated anaerobic sludge in 15h, and the concentrated perchlorate (∼200mg/g) on the surface of resin would be effectively microbial reduced after 3days. Neutral environment (pH=7...
March 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28340791/solid-phase-extraction-microfluidic-devices-for-matrix-removal-in-trace-element-assay-of-actinide-materials
#11
Jun Gao, Benjamin T Manard, Alonso Castro, Dennis P Montoya, Ning Xu, Rebecca M Chamberlin
Advances in sample nebulization and injection technology have significantly reduced the volume of solution required for trace impurity analysis in plutonium and uranium materials. Correspondingly, we have designed and tested a novel chip-based microfluidic platform, containing a 100-µL or 20-µL solid-phase microextraction column, packed by centrifugation, which supports nuclear material mass and solution volume reductions of 90% or more compared to standard methods. Quantitative recovery of 28 trace elements in uranium was demonstrated using a UTEVA chromatographic resin column, and trace element recovery from thorium (a surrogate for plutonium) was similarly demonstrated using anion exchange resin AG MP-1...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340785/an-automatic-chemiluminescence-method-based-on-the-multi-pumping-flow-system-coupled-with-the-fluidized-reactor-and-direct-injection-detector-determination-of-uric-acid-in-saliva-samples
#12
Christina Vakh, Stanislawa Koronkiewicz, Slawomir Kalinowski, Leonid Moskvin, Andrey Bulatov
A novel approach for the automatic chemiluminescence (CL) analysis of the complex samples is proposed. A multi-pumping flow system was successfully combined with fluidized reactor and direct-injection CL detector. The possibility of the approach was demonstrated on the determination of uric acid in saliva samples. Uric acid is clinically important analyte and its determination in biological fluids is related to human organism dysfunctions, such as gout. For the first time, the fast luminol - N-bromosuccinimide (NBS) reaction in an alkaline medium was used for the CL determination of uric acid in saliva samples...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28335832/development-of-126-sn-separation-method-by-means-of-anion-exchange-resin-and-gamma-spectroscopy
#13
Silvia Dulanská, Boris Remenec, Ján Bilohuščin, Ľubomír Mátel, Marek Bujdoš
This paper describes a method employing anion exchange resin for determination of (126)Sn in radioactive waste. The method is suitable for the separation of (126)Sn isotope from hydrochloric and hydrofluoric acid solution. The separation is based on precipitation of tin with ammonium sulfide in 0.5molL(-1) HCl, dissolution of the precipitate in concentrated HCl, loading in 2molL(-1) HCl onto anion exchange resin column and elution with 2molL(-1) HNO3. (126)Sn was measured by gamma spectrometry.
May 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28333047/mg-al-double-metal-hydroxide-regeneration-of-anion-exchange-resin-by-electric-field-intensification
#14
Ying Wang, Zhun Li, Yansheng Li, Zhigang Liu
Fouled anion exchange resins were regenerated by electric field intensification of Mg/Al double-metal hydroxides. Regenerative experiments were performed with varying voltages (10-30 V) and dosages of Mg/Al hydroxides (0.045-0.135 mol and 0.015-0.045 mol, respectively) for 1-5 h. Optimal results were obtained under the following regenerative conditions: 20 V, 4 h, and 0.09/0.03 mol of Mg/Al hydroxides. The maximum regenerative capacity of resins was increased to 41.07%. The regenerative mechanism was presented by Fourier-transform infrared spectrum of resins and Mg/Al hydroxides, and the regenerative degree was analyzed with respect to conductivity, pH value, and electric current...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28302978/determination-of-ultra-trace-metal-impurities-in-high-purity-cadmium-using-inductively-coupled-plasma-mass-spectrometry-after-matrix-separation-with-anion-exchange-resin
#15
Ayaka Wada, Naoko Nonose, Masaki Ohata, Tsutomu Miura
The analytical method for ultra-trace metal impurities at μg kg(-1) level in high-purity Cd was examined by inductively coupled plasma mass spectrometry (ICP-MS) combined with matrix separation by Bio-Rad AG MP-1M anion exchange resin. After the separation of Cd, the metal impurities such as Li, In, Cr, Mn, Fe, Co, Ni, Cu, Ga, Sr, Ba and Pb were measured by an ICP-quadrupole mass spectrometer (ICP-QMS) and ICP-sector field mass spectrometer (ICP-SFMS). From the comparison of measured results, it was evaluated that the analytical sensitivity by ICP-SFMS was 10 times higher than ICP-QMS...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302975/chromatographic-separation-of-cd-from-plants-via-anion-exchange-resin-for-an-isotope-determination-by-multiple-collector-icp-ms
#16
Rongfei Wei, Qingjun Guo, Hanjie Wen, Marc Peters, Junxing Yang, Liyan Tian, Xiaokun Han
In this study, key factors affecting the chromatographic separation of Cd from plants, such as the resin column, digestion and purification procedures, were experimentally investigated. A technique for separating Cd from plant samples based on single ion-exchange chromatography has been developed, which is suitable for the high-precision analysis of Cd isotopes by multiple-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The robustness of the technique was assessed by replicate analyses of Cd standard solutions and plant samples...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28286078/one-pot-synthesis-of-chitosan-grafted-quaternized-resin-for-the-removal-of-nitrate-and-phosphate-from-aqueous-solution
#17
H Thagira Banu, Sankaran Meenakshi
The present study deals with the synthesis of chitosan quaternized resin for efficient removal of nitrate and phosphate from aqueous solution. The resin was characterized with FTIR, SEM with EDX and XRD. Batch method was carried out to optimize various parameters such as contact time, initial concentration of nitrate and phosphate, dosage, pH, co-anions and temperature on the adsorption capacity of the adsorbent. The adsorption process illustrated that the Freundlich isotherm and the pseudo-second order are the best fitted models for the sorption of both anions...
March 9, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28272860/fabrication-of-stable-and-regenerable-amine-functionalized-magnetic-nanoparticles-mnfe2o4-sio2-nh2-as-a-potential-material-for-pt-iv-recovery-from-acidic-solutions
#18
D Harikishore Kumar Reddy, Wei Wei, Shuo Lin, Myung-Hee Song, Yeoung-Sang Yun
MnFe2O4@SiO2-NH2 magnetic nanocomposite (AFMNC) adsorbent with a particle size of ~50 nm was successfully synthesized using a facile approach. The as-prepared composite particles showed a fast binding of Pt(IV) with easy magnetic solid-liquid separation. The kinetic data were fitted to both pseudo-first and pseudo-second-order rate models, indicating that AFMNC exhibited a much higher rate of Pt(IV) binding (0.125 g mg-1 min-1) compared with commercial ion exchange resin Amberjet 4200 (0.0002 g mg-1 min-1)...
March 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28260627/purification-of-foot-and-mouth-disease-virus-by-heparin-as-ligand-for-certain-strains
#19
Ping Du, Shiqi Sun, Jinjie Dong, Xiaoying Zhi, Yanyan Chang, Zhidong Teng, Huichen Guo, Zaixin Liu
The goal of this project was to develop an easily operable and scalable process for the recovery and purification of foot-and-mouth disease virus (FMDV) from cell culture. Heparin resins HipTrap Heparin HP and AF-Heparin HC-650 were utilized to purify FMDV O/HN/CHA/93. Results showed that the purity of AF-Heparin HC-650 was ideal. Then, the O/HN/CHA/93, O/Tibet/CHA/99, Asia I/HN/06, and A/CHA/HB/2009 strains were purified by AF-Heparin HC-650. Their affinity/virus recoveries were approximately 51.2%/45.8%, 71...
April 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28259813/integrated-bicarbonate-form-ion-exchange-treatment-and-regeneration-for-doc-removal-model-development-and-pilot-plant-study
#20
Yue Hu, Treavor H Boyer
The application of bicarbonate-form anion exchange resin and sodium bicarbonate salt for resin regeneration was investigated in this research is to reduce chloride ion release during treatment and the disposal burden of sodium chloride regeneration solution when using traditional chloride-form ion exchange (IX). The target contaminant in this research was dissolved organic carbon (DOC). The performance evaluation was conducted in a completely mixed flow reactor (CMFR) IX configuration. A process model that integrated treatment and regeneration was investigated based on the characteristics of configuration...
February 8, 2017: Water Research
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