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Enhanced photocatalytic activity of Bi<sub>2</sub>MoO<sub>6</sub>/CdS/Ni ternary heterojunction: Role of Mott Schottky barrier and 2D-2D nanostructure for superior photodegradation of 2-aminophenol.

Author information

Affiliations

  • 1. Department of Chemistry, School of Natural Sciences (SNS), National University of Science and Technology (NUST), H-12, Islamabad 46000, Pakistan.
      Authors
    • Kanwal S 1
    • Astam E 1
    • Nisa MU 1
    • Nawaz R 1
    • Iqbal S 1
    (5 authors)
  • 2. Nanomaterials Research Center, Department of Chemistry, College of Science, Mathematics, and Technology, Wenzhou-Kean University, Wenzhou 325060, Zhejiang Province, China; Dorothy and George Hennings College of Science, Mathematics and Technology, Kean University, 1000 Morris Ave, Union, NJ 07083, USA.
      Authors
    • Bahadur A 2
    (1 author)
  • 3. Biomedical Engineering Department, College of Engineering and Technologies, Al-Mustaqbal University, 51001, Babylon, Iraq.
      Authors
    • Zidan A 3
    (1 author)
  • 4. Centre for Organic and Nanohybrid Electronics, Silesian University of Technology, Konarskiego 22B, 44-100 Gliwice, Poland; Joint Doctoral School, Silesian University of Technology, Akademicka 2A, 44-100 Gliwice, Poland.
      Authors
    • Saad M 4
    (1 author)
  • 5. Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute, University of Nottingham Ningbo China, Ningbo 315100, China; Functional Materials Group, Gulf University for Science and Technology, Mishref 32093, Kuwait.
      Authors
    • Mahmood S 5
    (1 author)
    • Show all (7)

ORCIDs linked to this article

Spectrochimica acta. Part A, Molecular and Biomolecular Spectroscopy, 16 Sep 2024, 325:125131
https://doi.org/10.1016/j.saa.2024.125131 PMID: 39303339 

Abstract 

A unique heterojunction combining Bi2MoO6/CdS with Ni nanoparticles has been synthesized using the solvothermal method. This novel heterojunction, composed of NSs and NRs, was characterized using XRD, Raman, SEM, TEM, STEM, EDX, XPS, UV, and PL techniques. The synthesized heterojunctions exhibited substantial photocatalytic activity towards the degradation of 2-aminophenol, significantly outperforming their single-metal counterparts. The photocatalytic efficiency of the tripartite sheet and rod composite was about 26 and 16 times higher than that of the separate CdS sheets and rods for the reduction of 2-aminophenol. The primary reactive species for photocatalytic degradation were identified as the holes of Bi2MoO6 and the electrons of CdS. The Mott Schottky barrier established between CdS and Ni nanoparticles prevents the transfer of electrons from Ni nanoparticles back to CdS, allowing Ni nanoparticles to efficiently capture electrons and prevent any backward flow. This, in turn, results in enhanced photocatalytic activity. The improved photocatalytic capability is ascribed to the S-scheme heterojunction between Bi2MoO6/CdS, which promotes better separation of electrons and holes. The Mott Schottky barrier between CdS and Ni also ensures a more abundant electron supply for chemical reactions, minimizing potential losses. The 2D-2D nanostructure morphology of Bi2MoO6 and CdS extends the surface area, enhancing light utilization and providing more active reaction sites. The synthesized heterojunction demonstrated impressive stability over three cycles, highlighting its potential for recycling and repeated use.

Full text links 

Read article at publisher's site: https://doi.org/10.1016/j.saa.2024.125131

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Funding 

Funders who supported this work.

Deanship of Scientific Research, King Khalid University (2)

King Khalid University