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RESEARCH ARTICLE
Contents Vol 72(4)

Influence of Surfactant on the Phase Transformation of Bi2O3 and its Photocatalytic Activity

Kasinathan Karthik A , K. R. Sunaja Devi A C , Dephan Pinheiro A and Sankaran Sugunan B
+ Author Affiliations
- Author Affiliations

A Department of Chemistry, CHRIST (Deemed to be University), Hosur Road, Bangalore, Karnataka, 560029, India.

B Department of Applied Chemistry, Cochin University of Science and Technology, Kochi, Kerala, 682022, India.

C Corresponding author. Email: sunajadevi.kr@christuniversity.in

Australian Journal of Chemistry 72(4) 295-304 https://doi.org/10.1071/CH18446
Submitted: 6 September 2018  Accepted: 10 December 2018   Published: 23 January 2019

Abstract

Bismuth oxide with its unique narrow bandgap has gained significant attention in the field of photocatalysis. A new and efficient method to synthesise bismuth oxide with tuneable properties is proposed herein. A surfactant assisted modified sol–gel method is used to synthesise bismuth oxide with excellent photocatalytic activity for the degradation of Rhodamine B dye. Three different surfactants, namely polyethylene glycol-400, sodium lauryl sulfate, and cetyltrimethylammonium bromide (CTAB) have been used. The fabricated bismuth oxide nanoparticles were characterised by X-ray diffraction, IR, scanning electron microscopy, and UV-diffuse reflectance spectroscopy analysis. Evolution of both the α and β crystalline phases of bismuth oxide was observed. The bandgap of the synthesised bismuth oxides ranges from 2.03 to 2.37 eV. The CTAB assisted synthesised bismuth oxide with a bandgap of 2.19 eV showed the highest photocatalytic activity of 93.6 % under visible light for the degradation of Rhodamine B. This bismuth oxide based catalyst opens a new avenue for efficient photocatalysis for environmental remediation.


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