Kinetic aspect of direct violet adsorption on M2+/M3+ (M2+: Zn; M3+: Al, Fe, Cr) layered double hydroxides

Abstract

As we know, synthetic dye such as direct violet is harmful to the environment. Synthetic dyes were adsorption using layered double hydroxides has been studied. The layered double hydroxides used were Zn/Al, Zn/Fe, and Zn/Cr, which were successfully synthesized using the co-precipitation method by adjusting at pH 10. Three obtained layered double hydroxide samples were characterized using X-ray Diffraction, Fourier Transform Infrared Spectroscopy, and surface area analysis by BET methods. The adsorption of direct violet onto Zn/Al, Zn/Fe and Zn/Cr layered double hydroxides. Based on the kinetics study, the result was tested using the pseudo-first-order and pseudo-second-order. The best models fit obtained with pseudo-second-order kinetics models.