Enhanced degradation of BPA in water by PANI supported Ag/TiO 2 nanocomposite under UV and visible light

Shepherd Sambaza, Arjun Maity, Kriveshini Pillay

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

PANI supported Ag@TiO 2 nanocomposite was synthesized via oxidative polymerization of aniline on Ag@TiO 2 . The Ag@TiO 2 nanocomposite was synthesized by the photo reduction of Ag nanoparticles on hydrothermally synthesized TiO 2 nanofibers. Raman analysis revealed that the anatase phase of TiO 2 was synthesized showing typical peaks at 195 cm -1 , 396 cm -1 , 514 cm -1 , and 637 cm -1 . The incorporation of PANI, a carbonaceous material was confirmed by appearance of D-band and G-band in Ag@TiO 2 -PANI that were located at 1505 cm -1 and 1603 cm -1 respectively. X-ray diffraction (XRD) analysis confirmed the anatase phase of TiO 2 was synthesized. Transmission electron microscopy analysis (TEM) analysis revealed that TiO 2 nanofibers were synthesized successfully and Ag nanoparticles of different sizes were deposited on their surface. X-ray Photon Spectroscopy (XPS) survey scan of the Ag@TiO 2- PANI-nanocomposite revealed that the nanocomposite was made from C, O, Ag, Ti, and N. DRS and Tauc's plot estimated the band gap of Ag@TiO 2 -PANI to be 3.0 eV A comparative study of the photocatalytic performance of Ag@TiO 2 -PANI catalyst showed better degradation performance under both conditions than pristine TiO 2, and Ag@TiO 2 with a degradation of up to 99.7% under visible light irradiation. The degradation experiments showed that the reactive species that were dominant in the degradation of BPA were h + and O 2- . Ag@TiO 2 -PANI nanocomposite was re-used to degrade BPA for up to four cycles without losing much of its photocatalytic ability with a removal of at least 90% in the fourth cycle.

Original languageEnglish
Article number102880
JournalJournal of Environmental Chemical Engineering
Volume7
Issue number1
DOIs
Publication statusPublished - Feb 2019

Keywords

  • Ag@TiO -PANI
  • Bisphenol A
  • UV
  • Visible light
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology

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