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- 저자 : M.D. Ogden (검색결과 5 건)
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Cobalt and nickel uptake by silica-based extractants
Pepper, Sarah E.,Whittle, Karl R.,Harwood, Laurence M.,Cowell, Joseph,Lee, Taek Seung,Ogden, Mark D. M. Dekker 2018 Separation science and technology Vol.53 No.10
<P>The pK(a)s of ethyl/butyl phosphonate silica (EBP-Si) have been determined, and the removal of cobalt and nickel from solution was investigated as a function of various parameters and compared with those of Purolite S950. pH uptake experiments suggested a combination of ion exchange and acid dissociation of the surface occurring. Isotherm data, fitted using the Langmuir and Dubinin-Radushkevich (D-R) models, indicated that stronger complexes formed with S950 than with EBP-Si. Kinetic data, fitted using a pseudo-second-order model, suggested that the rate-determining process is the reaction of metal ions with the chelating functionality of the resin. Uptake by EBP-Si is two to three times faster than that on S950.</P>
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Synthesis of Prussian blue-embedded porous polymer for detection and removal of Cs ions
Namgung, Ho,Gwon, Young Jin,Kim, Jongho,Jang, Geunseok,Pepper, Sarah E.,Ogden, Mark D.,Whittle, Karl R.,Harwood, Laurence M.,Lee, Taek Seung Elsevier 2018 Polymer Vol.158 No.-
<P><B>Abstract</B></P> <P>A Prussian blue (PB)-embedded coordination polymer (COP) was prepared by simple incorporation of PB into a COP composed of 1,1,2,2-tetrakis(4-carboxyphenyl)ethane and the Zn ion during the synthesis of COP. The PB-COP was prepared as micro-sized particles with green emission (490 nm) from the strongly fluorescent tetraphenylethene group in the solid state through aggregation-induced emission. The PB-COP showed particle shape with sizes ranging from 1 to 6 μm. As the PB in PB-COP efficiently adsorbed Cs ions, the microstructure of PB-COP was degraded to smaller particles, along with a concomitant decrease in the green fluorescence of the PB-COP. Such a decrease in the green emission of PB-COP was used as a signal for the presence of Cs ions, in which the limit of detection for Cs ions was found to be 73.8 ppb. The hybridized material of the PB-COP can be used as both an efficient adsorbent and a sensor for Cs ions, achieving simultaneous removal and detection.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A hybrid material was prepared with coordination polymer (COP) and Prussian blue (PB). </LI> <LI> COP was prepared by ionic interaction between COOH of organic molecules and Zn ions. </LI> <LI> The hybrid materials could remove efficiently Cs ions via adsorption on PB. </LI> <LI> The fluorescence of COP in hybrid materials also decreased upon exposure to Cs ions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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J.T.M. Amphlett,S.E. Pepper,A.L. Riley,L.M. Harwood,J. Cowell,K.R. Whittle,T.S. Lee,M.D. Ogden 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
Decommissioning is one of the most important phases in the life of a nuclear reactor, having a majorinfluence on public perception of such technology. Therefore, development of technologies that makedecommissioning more safe, effective and efficient is integral to the success of the nuclear industry. Inthis paper, phosphonic acid functionalised silica has been studied to determine its suitability for treatingnuclear decommissioning effluents produced in the HYBRID process, developed in South Korea. Cu2+recovery from HCl media in both static and dynamic modes was investigated, as well as the effect of Cu2+on Co2+ and Ni2+ recovery in a column loading system. Isothermal loading studies predicted a maximumloading capacity for Cu2+ of 22.82 mg g 1, however complex loading behaviour was observed. Cu2+sorption followed pseudo-second order kinetics with rapid uptake. Thermodynamic parameters havebeen extracted from collected kinetic data. Cu2+ outcompetes both Co2+ and Ni2+ for binding to the silicain column studies, which has implications for the use of phosphonic acid functionalised silica in treatingdecommissioning effluents. This work presents initial lab scale experiments, but shows the potential of Sibased extractants for use in metals recovery in the nuclear industry.
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Ellen M. Moon,Mark D. Ogden,Christopher S. Griffith,Abigail Wilson,Jitendra P. Mata 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.51 No.-
Using X-ray absorption spectroscopy, we have identified the mechanism by which chloride impacts theextraction of U(VI) by a weak base anion exchange resin from acidic sulfate solutions. The amount ofchloride present affects U(VI) speciation both in the feed solutions and adsorbed by the resin, and wefindthree distinct U(VI) species taken up by the resin across the salinity gradient, directly corresponding tochanges in levels of U(VI) extraction. Thesefindings are integral to the effective design of mineralprocessing circuits incorporating seawater—a cheaper and more sustainable water source than freshwater.
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REE behavior and sorption on weak acid resins from buffered media
James P. Bezzina,Mark D. Ogden,Ellen M. Moon,Karin L. Soldenhoff 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
Rare Earth Elements (REEs) are of great importance to modern day societies. Although abundant, concentration of REE minerals in ores are generally quite low, with high concentration of impurities. To counteract this, selective extraction processes must be undertaken. Selective adsorption of REE from buffered media solutions on Purolite S910 and Amberlite IRC86 weak acid resins has been studied. Batch experiments have been carried out on solutions containing a selection of REEs, Y3+, Fe3+ and Al3+ in unbuffered media, malic acid, formic acid, acetic acid, alanine and lactic acid to determine the best extracting media. Isotherm behavior and extraction kinetics of IRC86 were determined for acetic acid media, at the most effective pH that was determined to be 4.38. The isotherms were conducted for La3+, Sm3+, Er3+ and Y3+ determining extraction maxima of 0.29, 0.34, 0.49 and 0.60 mmol L−1, respectively, with adsorption energies increasing with the same trend. Kinetic experiments determined that mid REEs were the fastest adsorption, with light REEs and heavy REEs displaying similar half-lives and Y3+ measuring the smallest half-life out of the studied ions.
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