Visible-Light Photocatalysis of LSMO-Graphene Nanocomposites toward Degradation of Methyl Red
Visible-Light Photocatalysis of LSMO-Graphene Nanocomposites toward Degradation of Methyl Red
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DOI：
10.2320/matertrans.m2013317
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发表时间：
2014-02
影响因子：
1.2
通讯作者：
T. Xian;H. Yang;Y. F. Wang;L. Di;Jinlong Jiang;Ruishan Li;W. Feng
中科院分区：
文献类型：
--
作者：
T. Xian;H. Yang;Y. F. Wang;L. Di;Jinlong Jiang;Ruishan Li;W. Feng
La0.7Sr0.3MnO3 (LSMO) 纳米粒子通过聚丙烯酰胺凝胶路线合成。 LSMO-石墨烯纳米复合材料是通过将LSMO纳米粒子和石墨烯混合到无水乙醇溶液中然后热干燥而制备的。 SEM观察表明，合成的LSMO纳米粒子呈均匀规则的球体形状，平均尺寸为³24nm。 TEM 观察表明 LSMO 纳米粒子很好地组装到石墨烯片上。通过在可见光照射下降解甲基红（MR）来评估制备的样品的光催化活性。结果表明，与裸露的 LSMO 纳米粒子相比，LSMO-石墨烯纳米复合材料表现出增强的光催化活性。这可以通过以下事实来解释：光生电子被石墨烯捕获，导致光催化反应的空穴可用性增加。直接空穴氧化被认为是染料降解的主要机制。 [doi:10.2320/matertrans.M2013317]
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 ³24nm. 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. [doi:10.2320/matertrans.M2013317]