Authors:Sangita Pal, Suchismita Mishra, S. Satpati, G. Pandit, P. Tewari, and V. Puranik
“In-House” resin Polyacrylhydroxamic acid (PHOA) has been synthesized and utilized targeting ground water remediation; recovery
of uranium from low concentration aqueous solution e.g., mining activities related water, flooding of excavated or deplumed
areas, nuclear plant washed effluent and process generated effluents in nuclear plant during front-end as well as back-end
treatment. In the present study, treatment of field effluent containing heavy metals and radio-nuclides from contaminated
mining sites reflected preference for uranium with respect to manganese. The specific complexation between the extractant
and metal ion especially uranium provides high distribution co-efficient (Kd) for uranium (Kd,U = 1,450 mL/g from inlet of Effluent Treatment Plant (ETP) and Kd,U = 74,950 mL/g for synthetic solution) compared to high level impurity (1,000 times higher concentration) of manganese (Kd,Mn = 111 mL/g from inlet of ETP and Kd,Mn = 10,588 mL/g for synthetic solution). The “In-House” resin showed significant extractability (70–95% elution efficiency)
and indicates a possibility of selective removal/recovery of the valuable metal ions even from secondary sources. As a specialty,
resin can be regenerated and reused.
Authors:Mohammad Hosseini and Ahmad Hosseini-Bandegharaei
A new chelating polymeric sorbent as an extractant impregnated resin (EIR) has been developed using eosin B and Amberlite
IRA-410 resin. The impregnation process was characterized by FT-IR spectroscopy. The eosin B-impregnated resin showed superior
binding affinity for Th(IV) over U(VI) and many co-existing ions. The influence of various physicochemical parameters on the
recovery of Th(IV) were optimized by both static and dynamic methods. The Langmuir adsorption isotherm gave a satisfactory
fit of the equilibrium data. The kinetic studies performed for Th(IV) sorption revealed that <20 min was sufficient for reaching
equilibrium metal ion sorption. A preconcentration factor of 100 was found for the column-mode extraction. The accuracy of
the developed method in conjunction with Arsenazo III procedure was tested by analyzing geological reference materials and
seawater sample, which are prepared, synthetically. Furthermore, the above procedure has been successfully employed for the
analysis of natural water samples.
Authors:Abdelhakim Kadous, Mohamed Didi, and Didier Villemin
A new chelating polymeric sorbent has been developed using polystyrene resin grafted with ethylenediamino tris(methylenephosphonic)
acid. After characterisation by FTIR and elementary analysis, the new grafted resin has been investigated in liquid–solid
extraction of uranium(VI). The influence of analytical parameters including pH, amount of resin, metal ion concentration,
sample volume and ionic strength were investigated on the recovery of U(VI). Adsorption kinetic and isotherm studies were
also carried out to understand the nature of the sorption of uranium(VI) by the resin. The total sorption capacity was found
to be 41.76 mg/g under optimum conditions. The total desorption of the sorbed uranium ions was successfully performed with
0.1 M ammonium carbonate. Further, the effect of temperature was realized and the thermodynamic parameters were calculated.
Authors:Omar Abderrahim, Nacer Ferrah, Mohamed Didi, and Didier Villemin
A new chelating polymeric sorbent has been developed using polystyrene resin grafted with phosphonic acid. After characterization
by FTIR and elementary analysis, the new resin has been investigated in liquid–solid extraction of europium(III). The results
indicated that phosphonic resin could adsorb Eu(III) ion effectively from aqueous solution. The adsorption was strongly dependent
on pH of the medium with enhanced adsorption as the pH value of 6.5. The influence of other analytical parameters including
contact time, amount of resin, metal ion concentration, and ionic strength were investigated. The maximum uptake capacity
of Eu(III) ions was 122.6 mg/g grafted resin at ambient temperature, at an initial pH value of 6.50. The overall adsorption
process was best described by pseudo first-order kinetic. When Freundlich and Langmuir isotherms were tested, the latter had
a better fit with the experimental data. Furthermore, Eu(III) could be eluted by using 1.0 mol/L H2SO4 solution and the grafted resin could be regenerated and reused.
investigated methods of preparation alumina-coal-tar pitch-polymersorbents and also was determined their hydrophilic–hydrophobic properties.
Materials and methods of sample preparation
As carriers of coal pyrolyzate, granulated coal
Authors:Lei Gao, Peng Wang, Zhongxiang Chen, Shizhan Tang, Song Wu, Gang Li, and Dongli Qin
groups on the surface. The surface were patented mixed-mode polymericsorbents with reversed phase and strong cation- or anion-exchange functionalities attached to a polymer backbone of poly (divinyl-benzene-co-N-vinylpyrrolidone) [ 28 ]. MGs, CAP, FFC