Separation and adsorption of V(V) from canadium-containing solution by TOMAC-impregnated resins

Trioctyl methyl ammonium chloride-impregnated resins (TOMAC-IRs) were synthesized and utilized to efficiently separate and recover vanadium from acidic vanadium-containing solution, and the main factors affecting the adsorption properties of V(V) were studied. Under the optimal conditions, that is, initial pH of 1.8, liquid-solid ratio (L/S) of 200:1 mL/g, impregnation ratio of 18.4%, initial vanadium concentration of 1500 mg/L, and adsorption time of 4 h, the adsorption capacity towards V(V) can reach 78.65 mg/g, and impurity ions (Al and Fe) can be hardly adsorbed. The adsorption of V(V) onto TOMAC-IRs conforms to the Langmuir isotherm adsorption model, indicating that V(V) is adsorbed as a monolayer on TOMAC-IRs. The pseudo-second order kinetic model fits better towards the adsorption processes of V(V), which shows that the adsorption process is dominated by chemical adsorption. The desorption and regeneration of the TOMAC-IRs can be accomplished in just one step using 6 mol/L NaOH; in the meanwhile, the adsorption capacity is 98.01% of the original value after six cycles, demonstrating that the TOMAC-IRs have good stability during the cyclic adsorption of V(V). (c) 2021 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

Automated summary

TOMAC-IRs are effective in separating and recovering vanadium from acidic solutions, achieving a high adsorption capacity of 78.65 mg/g for V(V). The adsorption process is chemically controlled, and the TOMAC-IRs demonstrate good stability during cyclic adsorption of V(V).