Ageing behaviour of unary hydroxides in trivalent metal salt solutions: Formation of layered double hydroxide (LDH)-like phases

摘要

The ageing behavior of unary hydroxides of Mg, Ni, Cu and Zn were investigated in solutions of Al or Cr salts. These unary hydroxides transform into layered double hydroxide (LDH)-like phases. This reaction is similar to acid leaching and proceeds by a dissolution-reprecipitation mechanism offering a simple method of LDH synthesis. The powder X-ray diffractograms were used to investigate the aging of the samples. Interlayer spacing was observed using infrared spectra. Chemical analysis of samples were carried out using gravimetric and complexometric techniques.