Visible light active Zr- And N-doped TiO2coupled g-C3N4heterojunction nanosheets as a photocatalyst for the degradation of bromoxynil and Rh B along with the H2evolution process

Souman Pahi, Sumanta Sahu, Satish Kumar Singh, Abhijit Behera, Raj Kishore Patel

Research output: Contribution to journalArticlepeer-review

Abstract

Herein, we drastically increased the l ight-harvesting abilities of TiO2by creating a defect level with doping using zirconium (Zr) and nitrogen (N). Titanium was substantially replaced by Zr from its lattice point, and N was bound on the surface as (NO)x. The doped system comes with a reduced band edge of 2.8 eV compared to pure TiO2(3.2 eV), and the doping was accompanied by a higher rate of recombination of photogenerated electron-hole pairs. A heterostructure was fabricated between the modified titania and g-C3N4to efficiently separate the carriers. An easy and cost-effective sol-gel process followed by a co-calcination technique was used to synthesize the nanostructured composite. The optimum dopant concentration and the extent of doping were investigatedviaXRD, Raman, XPS, TEM, and PL analyses, followed by a photocatalytic study. The impact of the band positions was investigatedviaUV-DRS and EIS. The dynamic nature of the band alignment at the depletion region of the heterojunction increased the carrier mobility from the bulk to active sites. The photogenerated electrons and holes retained their characteristic redox abilities to generate both OH˙ and O2˙ through a z-scheme mechanism. The photocatalytic activity resulted in superior photocatalytic H2evolution along with the defragmentation of bromoxynil, a persistent herbicide. The active catalyst exhibited 97% degradation efficiency towards pollutants along with 0.86% apparent quantum efficiency during the H2evolution reaction.

Original languageEnglish
Pages (from-to)6468-6481
Number of pages14
JournalNanoscale Advances
Volume3
Issue number22
DOIs
StatePublished - 21 Nov 2021
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry (all)
  • Atomic and Molecular Physics, and Optics
  • Materials Science (all)
  • Engineering (all)

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