Magnetic glutamine‐grafted polymer for the sorption of U(VI), Nd(III) and Dy(III)

Abstract

BACKGROUND The nuclear power industry and other high‐tech industries require increasing quantities of uranium and rare‐earth elements (REEs). There is a need for materials that can competitively recover these metals from ore leachates (such as produced in the leaching of Egyptian ores). RESULTS A sorbent based on the chemical grafting of glutamine moieties on a magnetic polyacrylonitrile support was synthesized: polyacrylonitrile, crosslinked with 10% divinyl benzene in the presence of magnetite, was chemically modified by a series of grafting steps to produce a magnetic polyglutamine sorbent (MGLU). The sorbent was characterized by titration, elemental analysis, X‐ray diffraction (XRD), thermogravimetric analysis, Fourier‐transform infra‐red (FTIR) spectrometry and scanning electron microscopy (SEM). The sorption properties were tested as a function of pH; the sorption isotherms were modeled using the Langmuir equation (maximum sorption capacities: 2 mmol U g‐1 and up to 3.5 mmol g‐1 for Nd(III) and Dy(III)). The equilibrium is achieved within 1 h of contact. Metal desorption and sorbent recycling are highly efficient using acidic solutions; sorption/desorption performance remains stable for a minimum of 5 cycles. MGLU was tested for metal binding in multi‐metal solutions at different pH values. CONCLUSION This sorbent could be used for the recovery of REEs and uranium from simulated ore leachates. © 2017 Society of Chemical Industry

Bactericidal and In-Vitro Cytotoxic Efficacy of Silver Nanoparticles (Ag-NPs) Fabricated by Endophytic Actinomycetes and Their Use as Coating for the Textile Fabrics

“…The broad band at 3402.0 cm −1 is corresponded to O–H and NH stretching vibrations, which were overlapped [ 44 , 45 ]; while the peak at 2931.0 cm −1 was assigned to CH aliphatic stretching of hydrocarbon [ 46 , 47 ]. The two peaks at 1635.0 cm −1 and 1561.0 cm −1 were related to C=O stretching overlapped with amine-bending vibration [ 46 , 47 ]. The peaks at 2370.0 cm −1 and 2341.0 cm −1 were related to carbon dioxide peaks, adsorbed onto the protein surface [ 48 ].…”

Synthesis and adsorption characteristics of grafted hydrazinyl amine magnetite-chitosan for Ni(II) and Pb(II) recovery

“…(e) Hydrazinyl amine derivative of CE-MG-CH (HA-MG-CH) Hydrazine hydrate (10.9 g) was dissolved in 30 mL of absolute ethanol before adding CN-MG-CH material; the mixture was maintained under constant stirring for 6 h at 75 ± 2 °C. The sorbent was obtained after decantation and magnetic separation, ethanol washing, Milli-Q water washing and freeze-drying for 24 h (-54 °C, 0.1 mPa) [32,33], the scheme for sorbent synthesis is shown in Figure 1.…”

Integrated treatment of tailing material for the selective recovery of uranium, rare earth elements and heavy metals

“…The functionalization of MPAN consisted of a series of reactions with: (a) hydrazine hydrate to yield polyhydrazinyl amine (MPHA), (b) carbon disulfide to produce thion derivative (MTDT), (c) ethyl chloroacetate to synthesize acetate derivative (MTDE), (d) hydrazine hydrate to produce hydrazide derivative (MTHA), and (e) sodium nitrite (under specifically experimental conditions) to obtain MTZA (poly 1,3,4-thiadiazol-2-(3H)-thionylacetylazide) resin. The resin was then reacted with glutamine methyl ester to produce magnetic poly(methylglutamine) resin (MGLU) (Hamza and Abdel-Rahman, 2015;Hamza et al, 2018). FTIR analysis and chemical characterization have already been reported (Hamza et al, 2018).…”

“…The resin was then reacted with glutamine methyl ester to produce magnetic poly(methylglutamine) resin (MGLU) (Hamza and Abdel-Rahman, 2015;Hamza et al, 2018). FTIR analysis and chemical characterization have already been reported (Hamza et al, 2018). The particles were sieved and the fraction 100-200 Mesh (0.074-0.149 mm) was used for the sorption experiments.…”

“…Uranyl and REEs(III) are separated from the precipitated PLS (PPLS) by sorption/desorption sequence (Hamza et al, 2018). Since these metals are well sorbed on the magnetic resin (without selectivity, see above) this operation is only supposed to enrich the concentration of Fig.…”