Development of a novel PANI@WO3 hybrid composite and its application as a promising adsorbent for Cr(VI) ions removal

Hsini A., Naciri Y., Laabd M., BOUZIANI A., Navío J., Puga F., ...Daha Fazla

Journal of Environmental Chemical Engineering, cilt.9, sa.5, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 9 Sayı: 5
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1016/j.jece.2021.105885
  • Dergi Adı: Journal of Environmental Chemical Engineering
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, CAB Abstracts, Chemical Abstracts Core, Compendex, INSPEC, Veterinary Science Database
  • Anahtar Kelimeler: PANI@WO3 composites, Cr(VI) ions, Adsorption, Reduction, Binding mechanism, HEXAVALENT CHROMIUM, EFFICIENT REMOVAL, AQUEOUS-SOLUTION, MESOPOROUS SILICA, FACILE SYNTHESIS, DYE ADSORPTION, REDUCTION, WATER, NANOCOMPOSITE, POLYPYRROLE
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

© 2021 Elsevier LtdIn the current study, an in-situ oxidative polymerization method was used to synthesize polyaniline-coated tungsten trioxide biphasic composite (PANI@WO3). The as-developed composite material properties were elucidated using different characterization tools such as X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), N2 sorption-desorption isotherm, and X-ray photoelectron spectroscopy (XPS). The PANI@WO3 was further applied to remove hexavalent chromium (Cr(VI)) from aqueous solutions. The results demonstrated that the optimal removal efficacy was achieved at pH 2. Meanwhile, the pseudo-second-order kinetic and isotherm of the Langmuir model were fitted for Cr(VI) adsorption. Cr(VI) amount of 549.37 mg·g−1 was the maximum capacity of adsorption attained for PANI@WO3, which is significantly higher than that of existing adsorbents. From a thermodynamic point of view, the Cr(VI) adsorption process occurred spontaneously and endothermically. Importantly, PANI@WO3 still exhibited an excellent adsorption capability after five regeneration cycles, indicating the potential reusability of the PANI@WO3 composite. XPS analysis of PANI@WO3 surface after adsorption of Cr(VI) confirmed its adsorption and concomitant reduction into Cr(III) ions. The transfer of mass phenomenon, electrostatic attraction, and reduction reaction were the primary processes for Cr(VI) ions elimination. These findings revealed that the synthesized PANI@WO3 exhibited a high potential for wastewater treatment containing Cr(VI).