Design and synthesis of chelating diamide sorbents for the separation of lanthanides

Sorption Behavior of some Lanthanides on Graphene Oxide- Manganese dioxide Composite

“…According to BET method, the synthesized sorbents have specific surface area of 34.27, 18.09 and 45.74 m 2 .g −1 for GO, MnO2 and GO-MnO2, respectively. The total pore volume attains the values 0.03, 0.02 and 0.05 cm 3 .g −1 for GO, MnO2 and GO-MnO2, while their pore diameters have the values 1.61, 2.11and 3.91 nm, respectively. It is obvious from these data that the GO-MnO2 composite have higher values of SBET, VP and DP compared with that of their precursors GO and MnO2.…”

“…As a representative member of lanthanides, europium typically appears in the oxidation state +3 and in some cases the oxidation state +2 [2] . The radioisotopes of europium are used as burn up monitors to evaluate the performance and characteristics of reactors fuels [3] . 152+154 Eu is one of the most hazardous contaminants presents in radioactive wastewaters due to its relatively high energy (hard γemitter) and long half-life (13.54 and 8.5 y).…”

Assessing the Sorptive Ability of Synthesized Graphene Oxide‐Metal Oxide Composite to Remove Certain Lanthanides

“…[ 2 ] The radioisotopes of europium are usually used as burn‐up monitors to evaluate the performance and characteristics of reactors fuels. [ 3 ] 152+154 Eu is considered as one of the important constituents of radioactive wastewater because it emits hard γ‐rays with relatively high energy and has long half‐life amounting to 13.54 and 8.5 years. Besides, trivalent europium is usually taken as homologue for trivalent actinides due to the similarity in ionic radii which results in similar physicochemical properties of Eu(III).…”

DTPA-Functionalized Silica Nano- and Microparticles for Adsorption and Chromatographic Separation of Rare Earth Elements

“…26 Amino-polycarboxylic acid reagents are common types of chelating agents shown to possess superior efficiency for REE separation. The structures of functional carboxylic ligands, often referred to as complexonate ligands, contain carboxylic groups within the molecule in proximity to other binding functionalities, which can provide alternative and possibly more specific selectivity, such as in iminodiacetic acid (IDA), [30][31][32] ethylenediaminetetraacetic acid (EDTA), 33 nitrilotriacetic acid (NTA), 34 propylenediaminetetraacetic acid (PDTA) 35 and hydroxyisobutyric acid (HIBA). [36][37] Chromatographic techniques including extraction and chelation ion chromatography have recently been proposed and evaluated for the separation and determination of REEs.…”

“…Amino-poly­(carboxylic acid) reagents are common types of chelating agents shown to possess superior efficiency for REE separation. The structures of functional carboxylic ligands, often referred to as complexonate ligands, contain carboxylic groups within the molecule in proximity to other binding functionalities, which can provide alternative and possibly more specific selectivity, such as in iminodiacetic acid (IDA), − ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), propylenediaminetetraacetic acid (PDTA), and hydroxyisobutyric acid (HIBA). , Chromatographic techniques including extraction and chelation ion chromatography have recently been proposed and evaluated for the separation and determination of REEs. − Max-Hansen et al investigated preparative separation of lanthanides using a di­(2-ethylhexyl)-phosphoric acid (HDEHP) impregnated Kromasil-C18 column, with up to 7 M of HNO 3 as eluent in a gradient elution process. Ramzan et al studied analytical scale separation of REEs using C18-silica columns impregnated with different extractants, including HDEHP, 2-ethylhexyl, 2-ethylhexylphosphonic acid (H­[(EH)­EHP]) and di­(2,4,4-trimethylpentyl)-phosphinic acid (H­[TMPeP]), and using up to 2 M of HNO 3 as eluent.…”