Substantial improvement in the adsorption behavior of montmorillonite toward Tartrazine through hexadecylamine impregnation

Environ Res. 2022 Mar;204(Pt A):111965. doi: 10.1016/j.envres.2021.111965. Epub 2021 Aug 26.

Abstract

In the present work, the surface of montmorillonite K10 was successfully modified by hexadecylamine surfactant (Mt-HDA) and its intercalation and characteristics were assessed by XRD, FTIR, SEM, EDX and BET methods. Also, its adsorption performance was systematically examined in the removal of Tartrazine (TZ), as a sulfonated azo dye model, from aqueous phase. Our results showed that the HDA modification remarkably improved the adsorption ability of montmorillonite toward TZ molecules. The highest adsorption efficiency was achieved >98% at the pH range of 4-6 within a fast process (less than 30 min). The maximum adsorption capacity Mt-HDA toward TZ molecules was found to be ~59 mg/g at 45 °C. The kinetic study indicated that the adsorption kinetic follows pseudo-second-order model, which shows the chemisorption process between Mt-HDA and TZ molecules. Besides, the adsorption isotherm showed the monolayer coverage of Mt-HDA surface adsorption sites, which was fitted with the Langmuir isotherm model in an exothermic process. The adsorption mechanism was studied.

Keywords: Adsorption; Clay; Dye; Modification; Surfactant.

MeSH terms

  • Adsorption
  • Amines
  • Bentonite*
  • Hydrocarbons
  • Hydrogen-Ion Concentration
  • Kinetics
  • Tartrazine
  • Water Pollutants, Chemical* / analysis

Substances

  • Amines
  • Hydrocarbons
  • Water Pollutants, Chemical
  • Bentonite
  • Tartrazine
  • hexadecylamine