Removal of Cr(VI), Mo(VI), and V(V) Ions from Single Metal Aqueous Solutions by Sorption or Nanofiltration
The removal of Cr(VI), Mo(VI), or V(V) anions from single metal aqueous solutions was studied. Two alternative treatment methods were applied: (1) sorption of these anions onto commercially available akaganeite (b-FeOOH) or (2) nanofiltration, using a commercial spiralwound pilot-scale unit. During sorption experiments, kinetics and equilibrium were mainly studied. A modified second-order kinetic model was found to better fit the kinetic results. Freundlich isotherms better described (slightly) chromium and molybdenum equilibrium sorption experiments; whereas Langmuir isotherm better described vanadium equilibrium. During nanofiltration experiments, the influence of pH and of initial anion concentration was mainly studied, using a fixed background electrolyte concentration.and of initial anion concentration was mainly studied, using a fixed background electrolyte concentration
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