Synthesis of zinc-aluminum layered double hydroxides and their applications in removal of technetium from aqueous solutions

Abstract EN

Zinc-aluminium layered double hydroxide was synthesized by coprecipitation method in molar ratios Zn : Al 2:1 and 3:1.

The prepared layered double hydroxides were characterized by Fourer-transform infrared spectra (FTIR), X-ray diffraction (XRD) and scanning electron microscope (SEM).

The synthesized layered double hydroxides were used to study the removal of pertechnetate anion (TcO4-) from aqueous solution.

The influence of some parameters on pertechnate adsorption, including pH of aqueous solution, contact time and temperature were investigated.

The results showed that the sorption process is most effective at a pH of about 3 in the acidic solution.

The thermodynamic parameters, such as ΔHo, ΔSo and ΔGo clarified that the sorption is an endothermic process accompanied with an increase in the disorder of the system.