Preparation of Fe3O4/organo-montmorillonite nanocomposite and its use as an adsorbent for removal of an anionic dye


Açışlı Ö.

DESALINATION AND WATER TREATMENT, cilt.139, ss.369-378, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 139
  • Basım Tarihi: 2019
  • Doi Numarası: 10.5004/dwt.2019.23389
  • Dergi Adı: DESALINATION AND WATER TREATMENT
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.369-378
  • Anahtar Kelimeler: Magnetite nanoparticles, Reactive Yellow 81, Textile dye, Wastewater treatment, METHYLENE-BLUE ADSORPTION, AQUEOUS-SOLUTIONS, CATIONIC DYE, MONTMORILLONITE, EQUILIBRIUM, KINETICS, NANOPARTICLES, ACID, THERMODYNAMICS, NANOMATERIAL
  • Atatürk Üniversitesi Adresli: Evet

Özet

In the present study, the adsorption process was employed for removal of Reactive Yellow 81 (RY81) from aqueous solutions using a magnetically separable Fe3O4/Organo-montmorillonite (OMt) nanocomposite as an adsorbent. The synthesized material, which is composed of Fe3O4, dodecyl trimethyl ammonium bromide (DTAB) and montmorillonite (Mt), was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) analyses. Characterization results confirmed the well integration and incorporation of Fe3O4 nanoparticles and DTAB molecules into the Mt clay galleries. The removal efficiency of RY81 was examined at 20 degrees C, and studied as a function of adsorbent amount (0.5-2.0 g/L), initial dye concentration (20-100 mg/L), initial pH (2-11) and contact time (0-60 min). According to the experimental results, the removal efficiency decreased with the increasing initial dye concentration and pH. Besides, the optimum adsorbent dosage was determined as 1.25 g/L. The removal efficiency of 84.29% was achieved with the adsorbent dosage of 1.25 g/L, the initial dye concentration of 20 mg/L, the residence time of 60 min and the pH of 7.40. Experimental data were analyzed using different equilibrium isotherms such as Langmuir, Freundlich, Temkin, BET, Dubinin-Radushkevich and Harkins-Jura isotherms. The analysis results indicated that the adsorption process fitted well to pseudo-second-order, intra-particle diffusion kinetics and the Langmuir model. In addition, the adsorption occurs through the physical interactions and increases the adsorbed amount of anionic dye molecules by increasing the partial positive surface charge. Overall results have suggested that the Fe3O4/OMt can be used as a promising adsorbent in adsorption process for the applications of dye removal from aqueous solutions.