Synthesis and Characterization of the Carbonate Hydrotalcites (NiAl-HT, CoAl-HT, and NiCoAl-HT), and Its Application for Removal of the Anionic Azo Dye Titan Yellow from Aqueous Solution

This work focuses on studying the removal of Titan Yellow (TY) dye, which is a water pollutant using three matrices layered double hydroxide (LDHs; M+2Al-HT), with M+2 = Ni, Co, or NiCo were synthesized co-precipitation technique in solution constant pH. The X-ray diffraction (XRD) pattern formed solids shows that phase LDH type average interlamellar distance (dspacing ≈ 7.595 Å). Fourier-transform infrared spectroscopy (FT-IR) spectra compared, before and after adsorption, confirming displacement carbonated interlayers confirmed presence S=O bond dye under study. Thermogravimetric-differential thermal analysis (TG/DTG) temperatures decarbonation LDHs. BET specific surface areas NiAl-HT, NiCoAl-HT, CoAl-HT found equal to 156.819 m2∙g−1, 142.72 56.98 respectively, SEM-EDX micrographs results creation hydrotalcite material. UV–visible study adsorption TY performed by varying different parameters such as pH solution, mass, contact time, temperature. obtained isotherms from this kinetic show more efficient NiAl-HT. It can, therefore, be stated process endothermic spontaneous. could extended other anionic azo dyes having similar chemical structures.