Preparation of highly efficient and magnetically recyclable Fe3O4@C@Ru nanocomposite for the photocatalytic degradation of methylene blue in visible light
Preparation of highly efficient and magnetically recyclable Fe3O4@C@Ru nanocomposite for the photocatalytic degradation of methylene blue in visible light
复制标题
高效磁性可回收Fe3O4@C@Ru纳米复合材料的制备用于可见光光催化降解亚甲基蓝
DOI：
10.1016/j.apsusc.2019.03.225
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发表时间：
2019
影响因子：
6.7
通讯作者：
Diao Guowang
中科院分区：
文献类型：
--
作者：
Zhang Qi;Yu Liangyun;Xu Chenchen;Zhao Jinyong;Pan Haiyang;Chen Ming;Xu Qi;Diao Guowang
本文采用三步法合成了Fe3O4@C@Ru杂化纳米复合材料。采用X射线粉末衍射、透射电子显微镜、高分辨透射电子显微镜、能量色散谱、X射线光电子能谱、紫外-可见漫反射光谱和光致发光发射光谱对产物进行了表征。负载在Fe3O4@C纳米球碳壳表面的Ru纳米粒子呈近球形，平均粒径小于5 nm。以亚甲基蓝（MB）为降解对象，在模拟可见光照射下考察了该纳米材料的光催化活性。结果表明，Fe3O4@C@Ru纳米复合材料对亚甲基蓝的光催化降解活性高于Fe 3 O 4纳米球和Fe3O4@C纳米球，在模拟太阳光照射下140 min，在不添加任何其他氧化剂或还原剂的情况下，其对亚甲基蓝的降解率可达92.70%。在室温下，光降解反应为一级反应，速率常数为0.0176 min− 1。Fe3O4@C@Ru纳米复合材料的降解速率在5次循环后略有下降。此外，它们可以通过使用外部磁体容易地分离和回收。表明磁性可回收Fe3O4@C@Ru纳米复合材料在环境保护领域具有非常广阔的应用前景。
Herein, a kind of Fe3O4@C@Ru hybrid nanocomposites was successfully synthesized by a three-step process. The as-prepared products were characterized by X-ray powder diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, energy dispersive spectroscopy, X-ray photoelectron spectroscopy, UV–visible diffuse reflectance spectrometry and photoluminescence emission spectrometry. The Ru nanoparticles loaded on the surface of carbon shell on Fe3O4@C nanospheres were nearly spherical with an average diameter of less than 5 nm. The photodegradation of methylene blue (MB) was carried out under the irradiation of simulated visible light to investigate the catalytic activity of the introduced nanomaterial. The results showed that the catalytic activity of Fe3O4@C@Ru nanocomposites in the MB photodegradation was higher than that of Fe3O4nanospheres or of Fe3O4@C nanospheres, as they could degrade 92.70% of the dye in 140 min of simulated sunlight irradiation without any other oxidant or reductant. The photodegradation reaction was first-order with the rate constant of 0.0176 min−1at room temperature. The degradation rate of Fe3O4@C@Ru nanocomposites decreased very slightly after five cycles. Furthermore, they could be easily separated and recycled by using an external magnet. It indicated that the magnetically recoverable Fe3O4@C@Ru nanocomposites had a very broad application prospect in the field of environmental protection.