Selective Adsorption of Molybdenum(VI) and/or Vanadium(V) Using Cross-linked Polystyrene Resins with Bis(2-hydroxyethyl)amino, Bis(carboxymethyl)amino, and Bis(phosphonomethyl)amino Groups

Abstract

Styrene–divinylbenzene copolymers containing –N(CH₂CH₂OH)₂, –N(CH₂CO₂H)₂, and –N(CH₂PO(OH)₂)₂ moieties have been synthesized and applied to the selective adsorption of molybdenum and/or vanadium from aqueous solution. The equilibrium adsorption capacity vs. pH correlation and exchange kinetics of the resins for Mo^VI and V^V have been studied. The resin containing bis(2-hydroxyethyl)amino group is particularly effective for the selective recovery of Mo^VI and/or V^V by column operation due to its high adsorption capacity and faster exchange rate, whereas other resins required much longer time to attain adsorption equilibrium. The bis(2-hydroxyethyl)amino resin was used for the selective recovery of molybdenum from an acid-leaching solution of waste desulfurization catalyst.