Batch Equilibrations Research Articles

Sorption of europium(III) and iron(III) in ionic and colloidal states on silica gel

The sorption of europium(III) and iron(III) in colloidal and ionic states on silica gel has been studied as a function of the pH of aqueous solutions by batch equilibrations. The behaviour of Eu 3+, colloidal Eu(III), Fe 3+ and colloidal Fe(III) on the silica gel column has also been investigated. Conditions for the sorption of europium and iron from aqueous solutions are given.

Sorption of iron(III) in ionic and colloidal states on iron(III) oxide deposited on a silica gel sufrace

The sorption of iron(III) in ionic and colloidal states on iron(III) oxide deposited on a silica gel surface has been studied as a function of pH of aqueous solution by batch equilibrations. The behaviour of Fe3+ and colloidal Fe(III) on the sorbent column has also been investigated. Conditions for sorption of iron from aqueous solutions are given. The colloidal iron(III) can be quantitatively separated from Fe3+ on the sorbent column under given experimental conditions.

Adsorption of europium(III) in ionic and colloidal states on manganese dioxide deposited on a silaca gel surface

The sorption of europium(III) in ionic and colloidal states on manganese dioxide deposited on a silica gel surface has been studied as a function of pH of queous solutions by batch equilibrations. The behaviour of Eu 3+ and colloidal Eu(III) on the sorbent column has also been investigated. Conditions for the sorption of europium from aqueous solutions are given.

The uptake of metal ions and organic components by co-polyoxamides

The interaction of metal ions and of certain organic components in aqueous solution with water-insoluble co-polyoxamides was examined. Studies were performed with one-plate batch equilibrations and percentage uptake was determined spectrometrically. The metal ions investigated were Pb(II), Cu(II), Zn(II), Cd(II), Ni(II), Cr(III), Ag(I), Ca(II), and Li(I). Studies performed included variations of metal ion concentrations, pH, temperature, ionic strength, competitive uptake with other metal ions, degree of aromatic content of the resin, time, surface area, physical form of resin (whether particle or film), and comparison studies on uptake by sand particles. The results indicate the discovery of a resin whose mechanism of uptake can be converted from complexation at slightly acidic pH values to ion exchange at high base strengths or vice versa. Investigations into the uptake of aromatic acids and bases by co-polyoxamides have shown that percentage uptake is increased as the aromatic content of either the polymer or of the low-molecular-weight organic compounds is increased.

Adsorption of trivalent iron in the ionic and colloidal states on silica gel impregnated with manganese dioxide

The sorption of trivalent iron in the ionic and colloidal states on silica gel impregnated with manganese dioxide from aqueous solution has been studied by batch equilibrations. Adsorption isotherms, for the given range of sorbent loading, can be expressed by the Langmuir adsorption equation. The behaviour of Fe 3+ and colloidal Fe(III) on the sorbent column has also been investigated. Conditions for the sorption of Fe 3+ from nitric acid and colloidal Fe(III) from aqueous solution at different pH values are given.

Gel permeation chromatography of transition metal ions using bio-gels

Batch equilibrations of copper, palladium and platinum salts with Bio-Gel P-2 yielded adsorption isotherms of the Langmuir type. Distribution coefficients, equilibrium constants and enthalpy data, determined from elution profiles and adsorption isotherms, showed the interaction of palladium and platinum complexes with the gel to be much stronger than that of copper salts. Kinetic data were obtained from breakthrough curves of these salts through Bio-Gel P-2. It was found that in all instances adsorption proceeds at a much higher rate than desorption. The rate-determining step in the chromatographic process was found to be the detachment of solute molecules from the functional groups of the gel.

Separation of95Zr and95Nb by means of sorption on silica gel from hydrochloric acid solutions

The adsorption behaviour of zirconium and niobium on silica gel from hydrochloric acid solutions was studied by batch equilibrations and passage through columns. On the basis of this, new methods are suggested for the separation and purification of95Zr and95Nb in hydrochloric acid and hydrochloric acid—methanol solutions. The methods are comparatively simple and rapid, and both zirconium and niobium can be obtained in a radiochemically pure state.

Recovery of Neptunium-237 from Process Residues by Solvent Extraction

A solvent extraction process, utilizing tributyl phosphate as the extractant, was developed and proved on a semiworks scale for the separation of neptunium from processing residues. This extends the usefulness of tributyl phosphate as a solvent for the recovery of the heawy elements, adding neptunium to thorium, uranium, and plutonium. Standard laboratory techniques of batch equilibrations and batch countercurrent experiment8, using tracer techniques, established optimum conditions for primary extraction of uranium and neptunium and their separation. Results of these tests were confirmed in a putsed column demonstration. (auth)