The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Min Jia - One of the best experts on this subject based on the ideXlab platform.
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adsorption and separation of rhenium vii using n methylimidazolium functionalized strong basic Anion Exchange Resin
Journal of Chemical Technology & Biotechnology, 2013Co-Authors: Min Jia, Hongmin Cui, Weiqun Jin, Lili Zhu, Yu Liu, Ji ChenAbstract:BACKGROUND: Rhenium is a rare and valuable metal coexisting with molybdenum in molybdenite and sulfide copper ores and is hard to separate. Methods such as solvent extraction, ion Exchange, adsorption, precipitation, etc. have been used to separate and purify Re(VII), and Resin ion Exchange has been widely investigated and used owing to its convenient operation and relatively low-cost. The main challenge comes from the preparation of Resins having high performance and stability. In an earlier study, an N-methylimidazolium functionalized strong basic Anion Exchange Resin was successfully synthesized and used for Cr(IV) extraction. This paper, reports on further synthesis and application of this Resin for adsorption and separation of Re(VII) and Mo(VI), especially from copper arsenic filter cake. RESULTS: At pH 6.25, Re(VII) and Mo(VI) can be effectively separated with the N-methylimidazolium functionalized strong basic Anion Exchange Resin, giving a Re(VII) recovery of up to 93.3%, but only 5.1% for Mo(VI). When using the copper arsenic filter cake sample 89.1% Re(VII) recovery was achieved. CONCLUSION: The N-methylimidazolium functionalized strong basic Anion Exchange Resin exhibited high selectivity and recovery for Re(VII) in a mixed system. (c) 2012 Society of Chemical Industry
O V Atanova - One of the best experts on this subject based on the ideXlab platform.
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sorption of rhenium and uranium by strong base Anion Exchange Resin from solutions with different Anion compositions
Hydrometallurgy, 2013Co-Authors: A N Zagorodnyaya, Z S Abisheva, A S Sharipova, S E Sadykanova, Ye G Bochevskaya, O V AtanovaAbstract:Abstract The results of joint uranium and rhenium sorptions from the solutions with strong base Anion Exchange Resin Ambersep A920U (herein after A920), are presented in the paper. Effect of salt form (sulfate, chloride, nitrate, hydroxide), nature of sulfate, nitrate, and chloride containing compounds (acids, their sodium and zinc salts), sodium carbonate and ammonium hydrocarbonate and their concentration in the solutions (1–1000 mol/m3) to sorption ability of the metals were studied in static conditions. It was found that А920 Anionite sorb the metals from the solutions differently. Rhenium is sorbed with the Anion Exchange Resin of all salt forms and from the solutions of any composition. The nature of sulfates (acid, salts) has different effects: sulfuric acid better suppresses rhenium sorption as compared to that for zinc and sodium sulfates. The increase of sulfate concentration from 1 to 1000 mol/m3 reduces sorption of rhenium gradually and steeply. The nature of nitrates and chlorides does not affect sorption ability of rhenium but high concentration of the compounds depresses its sorption. Rhenium sorption from carbonate and hydrocarbonate solutions proceeds similarly to that for sulfate solutions. Rhenium is sorbed better from sodium carbonate solutions than from ammonium hydrocarbonate solutions. Uranium is well sorbed with the Anion Exchange Resin in sulfate form and badly with the Anionite in nitrate and chloride forms. Uranium is sorbed only from sulfate, carbonate and hydrocarbonate solutions in contrary to rhenium. Sorption ability of uranium at concentrations from 1 to 1000 mol/m3 is growing in contrary to rhenium, however at higher concentrations sorption ability is declining similarly to that for rhenium. The following groups were registered in the IR-spectra of saturated Anion Exchange Resin: SO42 −, HSO4−, NO3−, HCO3−, and CO32 − together with rhenium and uranium groups. Different sorption abilities of the metals were explained by their ion state in the solutions.
Sandra Mueller - One of the best experts on this subject based on the ideXlab platform.
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selective removal of nitrate from water by a macroporous strong basic Anion Exchange Resin
Desalination, 2012Co-Authors: Haiou Song, Yang Zhou, Sandra MuellerAbstract:Abstract An Anion Exchange Resin (NDP-2) was synthesized for selective nitrate removal in the binary co-existence systems. The characterization of NDP-2 have been performed by FT-IR, SEM and BET surface area analyses. The results showed that the amounts of nitrate sorbed onto NDP-2 were the highest compared to D201 and Purolite A 300 (A 300) Resin at equilibrium, and its sorption behavior followed the Langmuir adsorption isotherm model well. Furthermore, both the pseudo-first order and the pseudo-second order kinetic models showed well fitting about the process of nitrate sorbed onto NDP-2 Resin. Attractively, NDP-2 Resin demonstrated the more preferable absorption toward nitrate than the commercial D201 and Purolite A 300 in the presence of competing ions, such as SO42−, Cl− and HCO3−, in aqueous solution. Therefore, NDP-2 Resin would be a promising adsorbent to improve removal of nitrate from contaminated drinking water resources.
Ji Chen - One of the best experts on this subject based on the ideXlab platform.
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adsorption and separation of rhenium vii using n methylimidazolium functionalized strong basic Anion Exchange Resin
Journal of Chemical Technology & Biotechnology, 2013Co-Authors: Min Jia, Hongmin Cui, Weiqun Jin, Lili Zhu, Yu Liu, Ji ChenAbstract:BACKGROUND: Rhenium is a rare and valuable metal coexisting with molybdenum in molybdenite and sulfide copper ores and is hard to separate. Methods such as solvent extraction, ion Exchange, adsorption, precipitation, etc. have been used to separate and purify Re(VII), and Resin ion Exchange has been widely investigated and used owing to its convenient operation and relatively low-cost. The main challenge comes from the preparation of Resins having high performance and stability. In an earlier study, an N-methylimidazolium functionalized strong basic Anion Exchange Resin was successfully synthesized and used for Cr(IV) extraction. This paper, reports on further synthesis and application of this Resin for adsorption and separation of Re(VII) and Mo(VI), especially from copper arsenic filter cake. RESULTS: At pH 6.25, Re(VII) and Mo(VI) can be effectively separated with the N-methylimidazolium functionalized strong basic Anion Exchange Resin, giving a Re(VII) recovery of up to 93.3%, but only 5.1% for Mo(VI). When using the copper arsenic filter cake sample 89.1% Re(VII) recovery was achieved. CONCLUSION: The N-methylimidazolium functionalized strong basic Anion Exchange Resin exhibited high selectivity and recovery for Re(VII) in a mixed system. (c) 2012 Society of Chemical Industry
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adsorption of ce iv in nitric acid medium by imidazolium Anion Exchange Resin
Journal of Rare Earths, 2011Co-Authors: Lili Zhu, Ji ChenAbstract:Abstract N-methylimidazolium functionalized Anion Exchange Resin in NO3− form (RNO3) was prepared and used for adsorption of Ce(IV) in nitric acid medium. The adsorption amount increased with shaking time increasing and the adsorption equilibrium was obtained within 180 min. Ce(IV) was partially reduced to Ce(III) and the reduction percent of Ce(IV) increased with shaking time increasing. But RNO3 was more stable than other Resins due to the high resistance to oxidation. A little increase of adsorption amount was found with concentration of HNO3 increasing. However, the reduction percent of Ce(IV) decreased with the increase of HNO3 concentration. The addition of NaNO3 decreased the adsorption amount of Ce(IV) on RNO3 due to the competitive Anion Exchange reaction. Ce(IV) was adsorbed on RNO3 in the form of Ce(IV) Anion nitrato-complex. RNO3 and Ce(IV)-loaded RNO3 were characterized by fourier transform infrared (FT-IR) and thermogravimeric analysis (TGA). Ce(IV) could be easily separated from RE(III) solution by RNO3.
Fangdong Tang - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and characterization of pyridyl Anion Exchange Resin for ^99Tc removal
Journal of Radioanalytical and Nuclear Chemistry, 2019Co-Authors: Jianhua Zu, Lingxiao Fu, Fangdong Tang, Linfeng HeAbstract:A new pyridyl Anion Exchange Resin (PS-N) was synthesized by chloroacetylation and quaternization on the polystyrene-divinylbenzene microspheres (PS) and was characterized by FT-IR, TGA, and X-ray photoelectron spectroscopy. PS-N was applied to study the removal of Re(VII), a chemical analogue of ^99Tc, to investigate the effect of solution acidity, Resin dose and contact time on the adsorption efficiency. The adsorption process corresponded with the Langmuir isotherm model and matches well with pseudo-second-order kinetics. Based on the adsorption results of Re(VII), the adsorption efficiency of ^99Tc was examined to be 99.5% at optimum conditions.
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separation of thorium and uranium in nitric acid solution using silica based Anion Exchange Resin
Journal of Chromatography A, 2016Co-Authors: Yanliang Chen, Yuezhou Wei, Fangdong TangAbstract:To separate thorium and uranium in nitric acid solution using Anion Exchange process, a strong base silica-based Anion Exchange Resin (SiPyR-N4) was synthesized. Batch experiments were conducted and the separation factor of thorium and uranium in 9M nitric acid was about 10. Ion Exchange chromatography was applied to separate thorium and uranium in different ratios. Uranium could be eluted by 9M nitric acid and thorium was eluted by 0.1M nitric acid. It was proved that thorium and uranium can be separated and recovered successfully by this method.