Elaboration and properties of a new SDS/CTAB@Montmorillonite organoclay composite as a superb adsorbent for the removal of malachite green from aqueous solutions

Haounati R., Ouachtak H., El Haouti R., Akhouairi S., Largo F., Akbal F., ...Daha Fazla

SEPARATION AND PURIFICATION TECHNOLOGY, cilt.255, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 255
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1016/j.seppur.2020.117335
  • Dergi Adı: SEPARATION AND PURIFICATION TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Biotechnology Research Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Pollution Abstracts, Civil Engineering Abstracts
  • Anahtar Kelimeler: Clay, Surfactants, Malachite Green dye, Montmorillonite, Depollution, Adsorption, ADSORPTIVE REMOVAL, MODIFIED BENTONITE, MODIFIED CLAY, WASTE-WATER, DYE REMOVAL, CONGO RED, FLY-ASH, EQUILIBRIUM, EFFICIENT, NANOPARTICLES
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

In this study, the SDS/CTAB@Mt composite as a novel adsorbent has been prepared via a facile synergistic effect of cationic surfactant (CTAB) and anionic surfactant (SDS) for the modification of montmorillonite, and it was utilized to remove malachite green (MG) from aqueous solutions. The structure and the morphology of the SDS/CTAB@Mt composite were characterized by X-ray diffraction (XRD), Fourier Transform Infra-Red (FT-IR) spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive Analysis of X-rays (EDAX), and N-2 adsorption/desorption isotherms (BET method). The SDS/CTAB@Mt composite was found to be highly negatively surface charged, and showed good adsorption properties for MG molecules, reaching a maximum dye adsorbed amount of 1021.45 mg/g. Further, at the equilibrium, the experimental adsorption isotherms were in good agreement with the theoretical predicted data by the Langmuir model (R-2 = 0.99), indicating that the MG molecules were homogenously adsorbed and formed a monolayer on the SDS/CTAB@Mt surface. Moreover, the adsorption kinetics data were well fitted with pseudo-second-order model (R-2 = 0.99). From the adsorption temperature effect study, the thermodynamic parameters, such as G, Delta H and Delta S were assessed, and their values revealed that the adsorption reaction was spontaneous, exothermic and resulted in a decrease of the MG adsorbed molecules randomness on the adsorbent surface.