The effect of different complexing agents on preparation of Co2+–Ni2+–Fe3+–CO32– LDHs

Abstract

A new complexing agents assisted homogeneous precipitation technology was successfully developed for the synthesis of Co²⁺–Ni²⁺–Fe³⁺–CO₃^2– LDHs materials. Sodium sulfosalicylate (SSA), disodium tartrate (DST) and trisodium citrate (TSC) were used as complexing agents to study crystal structure and shape of the as-prepared materials. Upon the action of DST or TSC the obtained material had high crystallinity and well-defined hexagonal shape, particularly in the case of TSC. The latter was the best complexing agent for preparation of Co²⁺–Ni²⁺–Fe³⁺–CO₃^2– LDHs materials with the molar ratio Co²⁺/Ni²⁺/Fe³⁺/TSC equal to 0.5 : 3 : 1 : 0.06 or 0.5 : 3.5 : 1 : 0.10.