Adsorptive removal of uranium from water by sulfonated phenol–formaldehyde resin

Abstract

Adsorption characteristics of a sulfonated phenol-formaldehyde resin (SPR) have been studied for U removal from aqueous solution by means of batch method. Adsorption experiments have been carried out as a function of contact time, solution/adsorbent ratio, particle size and pH. Adsorption isotherm has been evaluated by changing adsorbent dosage in the range of 0.04-80 g/L at an initial uranyl nitrate concentration of 0.05 mol/L. The enormous adsorption capacity of 0.29 mol/g estimated from the plateau region of the S shaped isotherm is well comparable the Langmuir capacity of 0.31 mol/g. Equilibrium data are also adequately well described by the Freundlich and the Dubinin-Radushkevich (D-R) isotherm equations. The parameters of the isotherms and pH dependency of distribution coefficients (K D ) indicate that polymeric uranyl chains form on bidentate surface complex as a result of solute-solute interactions on the adsorbent surface. Both desorption and elution studies show that uranyl chains are irreversibly bounded on the SPR. Kinetic curves having a fast initial part followed by a slower process well fit both McKay model based on two-resistance diffusion and Nernst-Plank model with single diffusion coefficient.

The Preparation of p(acrylonitrile-co-acrylamide) hydrogels for uranyl ion recovery from aqueous environments

“…As one of the important actinide as a fuel in nuclear industry, the geochemical pathways of uranium is extremely important due to its long term toxic implications. Together with the other toxic metal ions such as Cu, Zn, Pb, Cd, and Hg, the removal of UO 2 2+ is extensively investigated [1][2][3][4][5][6][8][9][10]12,17,19,22]. Several techniques have been developed for determination uranium including spectrometry, neutron activation, spectrophotometer, molecular fluorescence spectrometry, gas chromatography, complex metric titration and voltammeter [22][23][24].…”

“…The form of UO 2 2+ , UO 2 (OH) + , UO 2 (OH) 2 and UO 2 (OH) 3 from soil, rock, mines can exist and create environmental problems. The form of these metal ions is strongly depend on the pH of the medium and the presence of other ions [3,6,[8][9][10][11]. For the removal of UO 2 2+ from aqueous environments various materials such as clays, ion exchange resins, ashes, activated carbon and polymeric structures has been widely used [5,7,8,11].…”

Removal of UO2 2+ from Aqueous Solutions by Maleic Anhydride-Styrene-vinyl acetate Terpolymer Modified with Ethylenediamine and Diethylenetriamine

“…The comparison obviously showed that these modified polymers synthesized in our laboratory should be considered amongst the favourite adsorbents. 13 Sulfonated phenol-formaldehyde 31 2-Acrylamido-2-methylpropane sulfonic acid 32 Amidoximated pine ibark 33 Poly(AAc/AAm)-cl-N,N-MBAAm 34 Chitosan/PVA hydrogel 35 Poly(acrylamidoxime-co-(1-(2-pirydylazo)-2naphtyl-2-methacrylate)-co-methacrylic acid) 36,37…”