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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.55  No.2 (2014)  >  pp.245-248

MATERIALS TRANSACTIONS
<<Previous article Vol.55  No.2 (2014)   pp.245 - 248 Next article>>

Visible-Light Photocatalysis of LSMO-Graphene Nanocomposites toward Degradation of Methyl Red

T. Xian1) 2), H. Yang1) 2), Y. F. Wang2), L. J. Di1), J. L. Jiang2), R. S. Li2), W. J. Feng2)
1) State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology 2) School of Science, Lanzhou University of Technology

La0.7Sr0.3MnO3 (LSMO) nanoparticles were synthesized by a polyacrylamide gel route. LSMO-graphene nanocomposites were fabricated by mixing LSMO nanoparticles and graphene into absolute ethanol solution followed by thermal drying. SEM observation shows that the synthesized LSMO nanoparticles are uniformly and regularly shaped like spheres with an average size of ∼24 nm. TEM observation reveals that LSMO nanoparticles are well assembled onto graphene sheets. The photocatalytic activity of prepared samples was evaluated by degrading methyl red (MR) under visible-light irradiation. It is demonstrated that LSMO-graphene nanocomposites exhibit an enhanced photocatalytic activity compared to bare LSMO nanoparticles. This can be explained by the fact that the photogenerated electrons are captured by graphene, leading to an increased availability of holes for the photocatalytic reaction. The direct hole oxidation is suggested to be the main mechanism toward the dye degradation.


Keyword:
polyacrylamide gel route, La0.7Sr0.3MnO3-graphene nanocomposites, photocatalysis, hole oxidation

Received: August 20, 2013
Accepted: November 21, 2013 , Published online: January 25, 2014
Copyright © 2014 The Japan Institute of Metals and Materials

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