Removal of V(V) from aqueous Cr(VI)-bearing solution using anion exchange resin: Equilibrium and kinetics in batch studies

Abstract

Vanadium (V) and chromium (Cr) co-exists in the whole process of V extraction from the vanadium titano-magnetite ore in China. It remains a challenge to remove trace V(V) from Cr(VI) in a simple way. Based on facile pretreatment of transforming Cr(VI) selectively, a novel method to remove V(V) from Cr(VI) by anion exchange resin Dex-V has been established. The influence of operation parameters including pH, contact time and temperature on adsorption ratio has been investigated. The Langmuir model and Henry model were successfully applied to describe the adsorption behavior of V by the Dex-V resin. It is shown that V is adsorbed chemically in monolayer and the Dex-V resin presents a homogeneous nature. Kinetics of V adsorption was analyzed with the pseudo-second order model, the Richenberg model and the Weber-Morris model. Results show that the rate of V adsorption is controlled by film diffusion in initial 70 min and the intra-particle diffusion contributes to the rate-controlling after 70 min. The proposed method was applied to remove V from real waste water and the removal ratio as high as 96% was obtained, with Cr recovery of 95%, which validates the effectiveness and efficiency of the novel method. This work has thus provided new insights into separation and recovery of analogue metals in aqueous.

Vanadium(V) Removal from Aqueous Solutions and Real Wastewaters onto Anion Exchangers and Lewatit AF5

“…On the other hand, double adsorption could increase the reagent cost and the operation time results limiting its practical application. To minimize the total cost of vanadium and chromium separation, the pretreatment method was applied [ 14 ]. V(V) and Cr(VI) were reduced with NaHSO 3 (pH 1.7); then, VO 2+ ions were oxidized by H 2 O 2 to the H 2 V 10 O 28 4− anions (pH 3.5); on the other hand, Cr 3+ ions were not oxidized, and after that, V and Cr were separated by the Dex-V anion exchange resin due to different charge natures.…”

Controllable Acid/Base Propriety of Sulfate Modified Mixed Metal Oxide Derived from Hydrotalcite for Synthesis of Propylene Carbonate

“…Propylene carbonate (PC) is a typical inert organic solvent and is widely applied to synthesize dimethyl carbonate, diethyl carbonate, and macromolecular polymers [1][2][3][4][5][6]. The synthesis of PC from urea and propylene glycol (PG) presents the advantages of economical and abundant raw materials, mild reaction conditions, and high safety [7][8][9].…”

Element Migration Behaviors During the Reduction of Vanadium Slag for Iron‐Removal and Vanadium‐Enrichment

“…[ 5–9 ] The leaching liquor is recovered by the ammonium precipitation method to collect ammonium polyvanadate precipitate (APP), then APP is calcined to obtain vanadium pentoxide. [ 10 ] The long product routing of intermediate vanadium pentoxide caused high energy consumption and hazardous leaching liquor waste containing highly toxic V 5+ and Cr 6+ ions, leading to failure in meeting the discharge standards and the environmental pollution problem. [ 11 ] Herein, it is meaningful to explore a short, low production cost and environment‐friendly technology for the production of FeV alloy, and producing FeV alloy using VS directly has been caused much attention.…”