Novel Co/Mo layered double hydroxide: synthesis and uptake of Fe(II) from aqueous solutions (Part 1)

A new type of M2+/M6+-LDH was prepared by the intercalation of Co/Mo-LDH with carbonate (CO3)(2-) as an interlayer anion through a precise control of the titration rate of the alkaline solution into the cobalt and molybdenum cations. From the analytical results, the structure, composition and morphology of the prepared material were approved by XPS, XRD, FT-IR, N-2 adsorption-desorption isotherm, SEM, and DSC-TGA. The synthesized Co/Mo-LDH was applied to the removal of ferrous ions from aqueous solutions at ambient temperature, different pH, constant stirring at 160rpm and different iron/adsorbent ratios. According to the experimental data, we have succeeded to prepare a novel adsorbent for Fe(II) uptake and at pH 5, stirring at 160rpm, and after 60min the uptake reached a maximum value of 10mg/g of Co/Mo-LDH. Hence, the higher adsorption capacity of the Co/Mo-LDH was explained by the formation of 4(+) surface charges between Co2+ and Mo6+ which produced a highly energetic surface layers as detected by XPS.