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A New Ag/AgBr/LaAlO3 Plasmonic Composite: Synthesis, Characterization, and Visible-Light Driven Photocatalytic Activity

  • Perala Venkataswamy
  • Mannepalli Sudheera
  • Kammara Vaishnavi
  • Kadari Ramaswamy
  • Gundeboina Ravi
  • Muga VithalEmail author
Article
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Abstract

In recent years, fabricating the visible-light induced photocatalysts based on the concept of plasmonic photocatalysis provides an efficient way to reduce environmental pollution. Accordingly, the present investigation has been carried out to develop such materials based on lanthanum aluminate (LaAlO3; LAO) and Ag/AgBr. The Ag/AgBr/LAO composite is prepared by deposition of metallic Ag nanoparticles onto the pre-prepared AgBr/LAO heterostructure by visible-light photo-reduction. The characteristic properties of synthesized catalysts were investigated by using a variety of techniques such as XRD, N2 adsorption–desorption, FESEM/EDX/EDS mapping, TEM-HRTEM, UV–Vis DRS, FT-IR, XPS, and PL measurements. The photocatalytic degradation of methylene blue (MB) was used as a probe reaction to evaluate their photocatalytic activity under visible-light irradiation. Because of the higher surface area with vast mesoporous nature, enhanced visible light absorption, and more efficient charge separation after the deposition of Ag/AgBr, the composite Ag/AgBr/LAO showed enhanced photocatalytic activity compared with pristine LAO. The recycling experiment revealed excellent stability (up to five successive cycles) of Ag/AgBr/LAO composite. Furthermore, a photocatalytic mechanism is proposed for the degradation of MB over Ag/AgBr/LAO composite. The composite Ag/AgBr/LAO can be used as a promising catalyst for environmental remediation.

Keywords

LaAlO3 Ag/AgBr nanocomposite plasmonic Ag nanoparticles charge separation methylene blue 

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Notes

Acknowledgments

The authors would like to acknowledge the Department of Science and Technology-Science and Engineering Research Board (DST-SERB) of India for financially supporting this research under the Extramural Research (renamed as Core Research Grant) [File No: EMR/2016/001533]. MV thanks to UGC, New Delhi, India, for the award of BSR Faculty Fellowship [F.18–1/2011(BSR)].

Conflict of interest

The authors declare that there is no conflict of interest regarding the publication of this manuscript.

Supplementary material

11664_2019_7938_MOESM1_ESM.doc (566 kb)
Detailed information about the unit cell parameters, FT-IR, and PL spectra of as-synthesized catalysts are provided (DOC 567 kb)

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Copyright information

© The Minerals, Metals & Materials Society 2020

Authors and Affiliations

  • Perala Venkataswamy
    • 1
  • Mannepalli Sudheera
    • 2
  • Kammara Vaishnavi
    • 1
  • Kadari Ramaswamy
    • 1
    • 3
  • Gundeboina Ravi
    • 1
  • Muga Vithal
    • 1
    Email author
  1. 1.Department of ChemistryOsmania UniversityHyderabadIndia
  2. 2.RVR and JC College of EngineeringChowdavaram, GunturIndia
  3. 3.Centre for Materials for Electronics Technology (CMET)HyderabadIndia

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