Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Porous peanut-like Bi2O3–BiVO4 composites with heterojunctions: One-step synthesis and their photocatalytic properties

Language

English

Abstract

For the first time, porous peanut-like Bi 2O 3- BiVO 4 composites with heterojunctions have been synthesized by a one-step mixed solvothermal method with the assistance of a l-lysine template. A mixture of ethylene glycol (EG) and H 2O (volume ratio of EG-H 2O = 3:1) is used as the solvent. Unlike the traditional methods, no concentrated HNO 3 and/or NaOH are involved in diluting Bi and V sources in the adopted approach. The as-synthesized peanut-like samples are rough and porous on the surface and to some extent are interior-hollow. The degradation of methylene blue (MB) is employed to evaluate the photocatalytic activity of the Bi 2O 3-BiVO 4 composite. It is observed that the composite performs much better than Bi 2O 3 and BiVO 4, plausibly due to heterojunctions formed between Bi 2O 3 and BiVO 4. To investigate the relationship between structure and performance, the as-synthesized samples are characterized by XRD, XPS, SEM, TEM (HRTEM), UV-vis DRS, PL and nitrogen adsorption-desorption methods. Additionally, a possible growth mechanism of this hollow peanut-like structure and the separation process of photogenerated electron-hole pairs on the heterojunctions have been discussed. © 2012 The Royal Society of Chemistry.

Publication Date

2012

Source Publication Title

Dalton Transactions

Volume

41

Issue

31

Start Page

9513

End Page

9518

Publisher

Royal Society of Chemistry

DOI

10.1039/c2dt30543g

Link to Publisher's Edition

http://dx.doi.org/10.1039/c2dt30543g

ISSN (print)

14779226

ISSN (electronic)

14779234

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