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RISS 인기검색어
- 검색키워드
- 저자 : Mark D. Ogden (검색결과 6 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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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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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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Remediation of radioiodine using polyamine anion exchange resins
Daniel N.T. Barton,Thomas J. Robshaw,Oluwatobi Okusanya,김대근,Sarah E. Pepper,Clint A. Sharrad,이택승,Mark D. Ogden 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
Two weak base anion exchange resins, Lewatit A365 and Purolite MTS9850, have been tested for theremoval of aqueous iodide from conditions simulating nuclear waste reprocessing streams. pH variationand relevant co-contaminant addition (nitrate, molybdate and iodine) allowed for assessment of iodideextraction behaviour of each resin. Isotherm experiments were performed and maximum uptakecapacities obtained exceed current industrial adsorbents, such as silver-impregnated zeolites. Maximumloading capacities, determined by Dubinin–Radushkevich isotherm, were 76114 mg g 1 for MTS9850and 589 15 mg g 1 for A365. Uptake for both resins was significantly suppressed by nitrate andmolybdate ions. The presence of dissolved iodine in the raffinate however, was found to increase iodideuptake. This was explained by characterisation of the spent resin surface by infrared and Ramanspectroscopy, which determined the presence of triiodide, indicating charge-transfer complex formationon the surface. Dynamic studies assessed the effect of co-contaminants on iodide uptake in a columnenvironment. Data wasfitted to three dynamic models, with the Dose-Response model providing the bestdescription of breakthrough. In all cases iodide breakthrough was accelerated, indicating suppression ofuptake, but capacity was still significant.
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Charlie R. Adams,Christopher P. Porter,Thomas J. Robshaw,James P. Bezzina,Victoria R. Shields,Alan Hides,Richard Bruce,Mark D. Ogden 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-
This study reports the development of a hydrometallurgical treatment for activated carbon ash (ACA); awaste product of the carbon-in-pulp (CIP) process used in the gold mining industry, rich in adsorbedprecious metals. After an initial screening of known leaching chemistries, the research focusses on duallixiviant(thiourea and thiocyanate) and thiourea systems, both of which have lower environmentalimpact than traditional cyanide leaches. Comparing ferric sulfate and hydrogen peroxide as oxidantsshowed that a thiourea leach is more suited to ferric sulfate whereas the dual-lixiviant leach achievedgreater extraction with hydrogen peroxide. This was believed to be due to a more favourable effective[thiourea]:[thiocyanate] molar ratio in solution. The latter demonstrated faster kinetics and improvedefficiency for dissolution of gold and silver. However, both leaches had issues with silver extraction due toformation of passivating layers on the surface of the silver nanoparticles. Kinetic modelling showed bothsystems tended towards a mixed-controlled process. Gold extraction of 89%, with leaching reachingequilibrium within 100 min, using the dual-lixiviant process demonstrated that there is an alternative tocyanide leaches employed in gold recovery.
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