Sorption Of Molybdenum Research Articles

The sorption of molybdenum by polymeric chelate-forming sorbents with the o-hydroxy〈1-Azo-1′〉o′-hydroxy functional group

The sorption of molybdenum by synthesized polymeric chelate-forming sorbents (PCSs) based on hydroxypolystyrene and a structural fragment with o-〈1-azo-1′〉o′-hydroxybenzene was studied. A mechanism of the sorption of molybdenum(VI) was suggested and substantiated. Qualitative correlations between the most important physicochemical parameters of the sorbent, sorption process, and sorbate (chelate) were established and described. The correlations can be used to quantitatively predict the physicochemical parameters of sorbents and their chelates for the purposes of synthesis, the use of PCSs for the concentration and isolation of elements, and physicochemical studies.

Optimization of the conditions of sorption of molybdenum(VI), tungsten(VI), and vanadium(V) on modified silica gels with the use of bromopyrogallol red and surfactants

Sorption of molybdenum(VI), tungsten(VI), and vanadium(V) on amino silica gels in the presence of an anionic dye, bromopyrogallol red, and cationic surfactants fixed on the sorbent surface or present in solution was studied.

A novel on-line preconcentration method for trace molybdenum determination by USN–ICP OES with biosorption on immobilized yeasts

A new system for on-line preconcentration of molybdenum by sorption on a minicolumn associated to inductively coupled plasma — optical emission spectrometry with ultrasonic nebulization was studied. It is based on the sorption of molybdenum on a column packed with immobilized baker's yeasts on controlled pore glass without further complexing reagent. The molybdenum preconcentrated by biosorption was subsequently eluted with hydrochloric acid. Considering a sample flow rate of 5.0 mL min − 1 , 10 mL of sample was preconcentrated in 2 min achieving a sensitive total enhancement factor of 480-fold, and the detection limit (3 s) obtained was 21 ng L − 1 . Additionally, the calculated precisions expressed as percent relative standard deviation (RSD%) was 1.9%. Satisfactory results were obtained for the determination of molybdenum in standard reference material NIST 1643e Trace Elements in Water and real water samples.

Sorption of Molybdenum(VI) on Synthetic Magnetite

ABSTRACTIn this study we experimentally investigated the interaction of Mo(VI) with magnetite, which is a corrosion product of steel. The work was conducted with commercial magnetite, and we studied the influence of pH, pe and solid/liquid ratio on Mo sorption. A Surface Complexation Model (SCM) has been applied tothe experimental data, allowing to explain the results using the Diffuse Layer Model (DLM) and by considering the formation of the monodentate complex: >FeOMo(OH)5. At pH 2, experimental data were satisfactorily fitted to a a Langmuir isotherm.

Sorption Purification of Aqueous Ammonium Molybdate To Remove Tungsten Impurities with a Cation Exchanger Containing Pyrocatechol Functional Groups

The sorption of molybdenum(VI) and tungsten(VI) from weakly alkaline and neutral solutions with PK-S cation exchanger containing pyrocatechol functional groups was studied. The possibility of selective recovery of tungsten(VI) impurities from aqueous ammonium molybdate with PK-S resin was examined.

Investigation of cation-exchange behaviour of molybdenum (VI) in aqueous and ethanolic solutions of hydrochloric acid

The sorption of molybdenum(VI) onto Ku-2 × 8 cation-exchange resin in the hydrogen form from hydrochloric acid (0.01-4 M) in the presence and absence of ethanol (20–80%) has been investigated.