Graphene-wrapped Ag3PO4/LaCO3OH heterostructures for water purification under visible light

Santosh S. Patil, Mukund G. Mali, Animesh Roy, Mohaseen S. Tamboli, Virendrakumar G. Deonikar, Deepak R. Patil, Milind V. Kulkarni, Salem S. Al-Deyab, Sam S. Yoon, Sanjay S. Kolekar, Bharat B. Kale

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

We demonstrated a unique synthesis approach of graphene (GR)-wrapped Ag3PO4/LaCO3OH (APO/LCO) heterostructures by an in-situ wet chemical method. FESEM analysis reveals the formation of rhombic dodecahedrons of APO decorated with LCO and later wrapped with GR flakes. Optical studies shows two absorption edges corresponding to the band gap energies of APO (2.41 eV) and LCO (4.1 eV). Considering the absorption edge of the heterostructures in the visible region, the photocatalytic activities of photocatalysts containing different APO/LCO mass ratios were evaluated by the degradation of MB. GR-decorated composite with 20% LCO (APO/LCO20/GR) exhibited the highest photocatalytic activity for MB degradation, with a rate constant, k of 0.541 min−1. The photocatalytic activity of APO/LCO20/GR more greatly enhanced than those of the individual constituents (APO, LCO, APO/LCO20). The enhanced photocatalytic activity of the heterostructure can be attributed to the co-catalytic effect of LCO as well as intriguing physicochemical properties of GR. To understand the enhanced photocatalytic activity of the heterostructures the photocatalytic reaction mechanism is proposed in detail. The recyclability of the APO/LCO/GR composite photocatalyst is further evaluated by reusing the catalyst in replicate photocatalytic experiments which shows consistent photocatalytic activity thereby confirms the stability and reusability of heterostructure photocatalyst.

Original languageEnglish
Pages (from-to)845-853
Number of pages9
JournalJournal of Energy Chemistry
Volume25
Issue number5
DOIs
Publication statusPublished - 2016 Sept 1
Externally publishedYes

Bibliographical note

Funding Information:
Authors would like to thank Department of Electronics and Information Technology (DeitY, New Delhi) for financial support. Authors wish to thanks Nanocrystalline Material and Glass Laboratory, C-MET Pune for their generous help. Authors also acknowledge the support from UGC-SAP, DST-FIST Department of Chemistry, Shivaji University Kolhapur. The author acknowledges Prof. S. W. Gosavi, Department of Physics, Savitribai Phule Pune University for providing the technical support. This research was partially supported by the Commercialization Promotion Agency for R&D Outcomes (COMPA) funded by the Ministry of Science, ICT and Future Planning (MISP) and NRF-2013R1A2A2A05005589. S.S.Y. expresses his thanks to the support made by King Saud University, Vice Deanship of Research Chairs.

Publisher Copyright:
© 2016 Science Press

Keywords

  • AgPO
  • Co-catalyst
  • Graphene
  • Heterostructures
  • LaCOOH
  • Photocatalytic MB degradation

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Electrochemistry

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