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

Abstract

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 13 C 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] 4species. This coordination knowledge was employed to develop an extraction mechanism and derive an isotherm model based on the law of mass action.

Reusable ionic liquid‐functionalized polystyrene for the highly efficient removal of sulfadiazine sodium

“…On the other hand, the resonance signal at 124.8 ppm assigned to quaternary aromatic carbons became broader and shifted to 125.3 ppm after grafting 1‐(trimethylsilyl) imidazole because signal of the quaternary aromatic carbon atoms on the imidazole ring overlaped with that on the PS‐CH 2 Cl . In addition, the resonance signal at around 37.0 ppm for aliphatic carbon atoms in the PS‐CH 2 Cl matrix could be also observed in PS‐CH 2 ‐[TSiIm][Cl]. These results indicated that imidazole ring had been grafted onto the surface of PS‐CH 2 Cl and the grafting procedures did not change the structure of PS‐CH 2 Cl.…”

The effect of contaminants on the application of polyamine functionalised ion exchange resins for uranium extraction from sulfate based mining process waters

“…However, recent work in our group has shown that WBA resins are able to extract UO2 2+ from aqueous sulfuric acid media with comparable loading capacities to SBA resins. 19 It has also been reported that certain WBA resins are selective for UO2 2+ over Fe 3+ and show a strong tolerance to dissolved chloride. 1,9 11,21,23,25 27 This work details the use of a selection of WBA resins for uranyl extraction from sulfate based aqueous media relevant to current, and potential future, uranium extraction processes.…”

“…The selected WBA resins are the commercially available Purolite S985 ( Figure 1) and three previously reported polyamine functionalised ion exchange resins synthesised in house ( Figure 2). 19,23,28 The uptake of common contaminant metal ions found in ore and gangue minerals has been assessed, as well as the effect of increasing concentrations of chloride and iron on uranyl extraction.…”

“…In house resins were synthesised by heating to reflux a mixture the Merrifield resin and the relevant polyamine (ethylenediamine, diethylenetriamine, pentaethylenehexamine) in 1,4-dioxane as described previously. 19 This resulted in Ps-EDA, Ps-DETA and Ps-PEHA respectively.…”

Uranium Recovery from Aqueous Solutions Using Amidoxime Modified Cellulose Derivatives. II. Uranium Uptake Behavior of Amidoximated Ethyl Cellulose

“…He mentioned that amidoxime-functionalized polymers are the most technologically ripe adsorbent for the uranium recovery and have indicated impressive performance following protracted contact with seawater in screening studies, as well as in longterm dehiscence at the pilot scale in the open ocean. In another study (17), uranyl ion uptake from sulfuric acid solutions has been evaluated as a function of pH and sulfate concentration, with comparison to a commercially available weak base anion exchange resin. Maximum uranyl loading capacity was found as 269.50 mg/g for weak base anion exchange resin.…”