TY - JOUR

T1 - Polyamine functionalised ion exchange resins: Synthesis, characterisation and uranyl uptake

AU - Amphlett, James

AU - Ogden, Mark

AU - Foster, Richard I.

AU - Syna, Nelish

AU - Soldenhoff, Karin

AU - Sharrad, Clint A.

PY - 2018/2/15

Y1 - 2018/2/15

N2 - A series of linear polyamine functionalised weak base anion exchange resins have been synthesised using the Merrifield resin and characterised using infra-red spectroscopy, thermogravimetry, elemental analysis and solid state 13C nuclear magnetic resonance spectroscopy. Uptake behaviour towards uranium (as uranyl) from sulfuric acid media has been assessed as a function of pH and sulfate concentration, with comparison to a commercially available weak base anion exchange resin, Purolite S985. Synthetic polyamine resins were seen to outperform the commercial resin at industrially relevant uranyl concentrations, with a trend of increased uptake being seen with increasing polyamine chain length. Uranium loading isotherm studies have been performed and fit with the Langmuir and Dubinin-Radushkevich isotherm models, with a maximum loading capacity observed being 269.50 mg g−1 for the longest polyamine chain studied. Extended X-ray absorption fine structure experiments have been used to determine uranium coordination environment on the resin surface, showing a [UO2(SO4)3]4− species. This coordination knowledge was employed to develop an extraction mechanism and derive an isotherm model based on the law of mass action.

AB - A series of linear polyamine functionalised weak base anion exchange resins have been synthesised using the Merrifield resin and characterised using infra-red spectroscopy, thermogravimetry, elemental analysis and solid state 13C nuclear magnetic resonance spectroscopy. Uptake behaviour towards uranium (as uranyl) from sulfuric acid media has been assessed as a function of pH and sulfate concentration, with comparison to a commercially available weak base anion exchange resin, Purolite S985. Synthetic polyamine resins were seen to outperform the commercial resin at industrially relevant uranyl concentrations, with a trend of increased uptake being seen with increasing polyamine chain length. Uranium loading isotherm studies have been performed and fit with the Langmuir and Dubinin-Radushkevich isotherm models, with a maximum loading capacity observed being 269.50 mg g−1 for the longest polyamine chain studied. Extended X-ray absorption fine structure experiments have been used to determine uranium coordination environment on the resin surface, showing a [UO2(SO4)3]4− species. This coordination knowledge was employed to develop an extraction mechanism and derive an isotherm model based on the law of mass action.

KW - Uranium

KW - polyamine

KW - Ion exchange

KW - EXAFS

KW - Isotherm models

U2 - 10.1016/j.cej.2017.11.040

DO - 10.1016/j.cej.2017.11.040

M3 - Article

VL - 334

SP - 1361

EP - 1370

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

SN - 1385-8947

ER -