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Vol. 9 No. 2 (2017)

In-Situ Hydrothermal Synthesis of Bi–Bi2O2CO3 Heterojunction Photocatalyst with Enhanced Visible Light Photocatalytic Activity

https://doi.org/10.1007/s40820-016-0118-0
Prasenjit Kar
Department of Chemical Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, SaltLake, Kolkata 700106, India
Tuhin Kumar Maji
Department of Chemical Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, SaltLake, Kolkata 700106, India
Ramesh Nandi
Department of Chemical Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, SaltLake, Kolkata 700106, India
Peter Lemmens
Institute for Condensed Matter Physics, TU Braunschweig, Mendelssohnstraße 3, 38106 Brunswick, Germany
Samir Kumar Pal
Department of Chemical Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, SaltLake, Kolkata 700106, India

Corresponding Author: Samir Kumar Pal

skpal@bose.res.in

Nano-Micro Letters, Vol. 9 No. 2 (2017), Article Number: 18

Abstract

Bismuth containing nanomaterials recently received increasing attention with respect to environmental applications because of their low cost, high stability and nontoxicity. In this work, Bi–Bi2O2CO3 heterojunctions were fabricated by in-situ decoration of Bi nanoparticles on Bi2O2CO3 nanosheets via a simple hydrothermal synthesis approach. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) were used to confirm the morphology of the nanosheet-like heterostructure of the Bi–Bi2O2CO3 composite. Detailed ultrafast electronic spectroscopy reveals that the in-situ decoration of Bi nanoparticles on Bi2O2CO3 nanosheets exhibit a dramatically enhanced electron-hole pair separation rate, which results in an extraordinarily high photocatalytic activity for the degradation of a model organic dye, methylene blue (MB) under visible light illumination. Cycling experiments revealed a good photochemical stability of the Bi–Bi2O2CO3 heterojunction under repeated irradiation. Photocurrent measurements further indicated that the heterojunction incredibly enhanced the charge generation and suppressed the charge recombination of photogenerated electron-hole pairs.


Highlights:


1 A facile low cost hydrothermal technique was employed to synthesize of Bi-Bi2O2CO3, and Bi nanoparticles was decorated in-situ on Bi2O2CO3.
2 The heterostructure exhibits enhanced electron-hole separation and improves visible-light photocatalytic activity effectively.

Keywords

Bi nanoparticles Bi–Bi2O2CO3 nanosheets Heterojunction Hydrothermal method Charge separation Visible light photocatalytic activity
Kar, Prasenjit, Tuhin Kumar Maji, Ramesh Nandi, Peter Lemmens, and Samir Kumar Pal. 2016. “In-Situ Hydrothermal Synthesis of Bi–Bi2O2CO3 Heterojunction Photocatalyst With Enhanced Visible Light Photocatalytic Activity”. Nano-Micro Letters 9 (2):18. https://doi.org/10.1007/s40820-016-0118-0.
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