Synthesis of Ni-Fe-CO3 layered double hydroxide as Effective Adsorbent to remove Cr(VI) and ARS-dye from aqueous media

Ni2+/Fe3+LDH, (Ni-Fe-CO3 LDH) with Ni/Fe molar ratio 3.0 was synthesized by co -precipitation for the remediation of chromium (VI), and Alizarine Red-S (ARS-dye) as anionic species. The investigated adsorbent was characterized by TGA, SEM, XRD, BET and FTIR. The effect of the hydrogen ion concentration of the medium, shaking time, ARS-dye and/or Cr(VI) concentration and adsorbents mass on the process was studied. The results of Ni-Fe-CO3 LDH fitted well with the pseudo-second-order model. Langmuir isotherm is more favor than the Freundlich isotherm with maximum capacity (Qmax) of 69.9 and 6.1 mg/g for ARS-dye and Cr(VI), respectively.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

Ni2+/Fe3+ LDH, (Ni-Fe-CO3 LDH) with Ni/Fe molar ratio 3.0 was synthesized by co -precipitation for the remediation of chromium (VI) and Alizarine Red-S (ARS-dye). The effects of hydrogen ion concentration, shaking time, ARS-dye and/or Cr(VI) concentration, and adsorbents mass on the process were studied. The results showed that Ni-Fe-CO3 LDH fitted well with the pseudo-second-order model, and Langmuir isotherm had a better adsorption effect on ARS-dye and Cr(VI).