Controlled synthesis and photocatalysis of sea urchin-like Fe3O4@TiO2@Ag nanocomposites.
Controlled synthesis and photocatalysis of sea urchin-like Fe3O4@TiO2@Ag nanocomposites.
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DOI：
10.1039/c5nr08624h
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发表时间：
2016-02
期刊：
影响因子：
6.7
通讯作者：
Yilin Zhao;Chen Tao;Gang Xiao;Guipeng Wei;Linghui Li;Changxia Liu;Haijia Su
中科院分区：
文献类型：
--
作者：
Yilin Zhao;Chen Tao;Gang Xiao;Guipeng Wei;Linghui Li;Changxia Liu;Haijia Su
基于纳米TiO 2和Ag的协同光催化活性以及Fe 3 O 4的磁性，可控合成了一种具有可调腔尺寸、可调TiO 2包覆层、结构稳定性和比表面积的海胆状Fe3O4@TiO2@Ag纳米复合材料（Fe3O4@TiO2@Ag NCs）。在这里，Fe3O4@TiO2@Ag纳米复合材料获得了以Fe 3 O 4为核，以TiO 2/Fe 3 O 4/Ag纳米异质结为壳的Fe3O4@TiO2@Ag纳米复合材料;直径约为4 nm的Ag纳米颗粒均匀地负载在TiO 2纳米纤维上和海胆状Fe3O4@TiO2纳米复合材料的空腔内。Ag纳米粒子通过LSPR吸收在TiO 2/Fe 3 O 4/Ag异质结中产生更多的光生电荷，增强了TiO 2的带隙吸收，而Fe 3 O 4助催化剂通过光生电子向氧的有效转移为氧还原提供了活性位。因此，TiO 2/Fe 3 O 4/Ag纳米异质结的协同效应提高了光催化性能。作为光催化剂在紫外和可见光照射下，合成的纳米复合材料显示出增强的光催化和回收性能的降解氨苄青霉素。此外，它们在可见光照射下呈现出更好的广谱发光。增强的光催化活性和优异的化学稳定性，结合磁性可回收性，使这种多功能纳米结构在未来的水环境污染的降解和修复的一个有前途的候选人。
Based on the synergistic photocatalytic activities of nano-sized TiO2 and Ag, as well as the magnetic properties of Fe3O4, a sea urchin-like Fe3O4@TiO2@Ag nanocomposite (Fe3O4@TiO2@Ag NCs) is controllably synthesized with tunable cavity size, adjustable shell layer of TiO2 nanofiber, higher structural stability and larger specific surface area. Here, Fe3O4@TiO2@Ag NCs are obtained with Fe3O4 as the core and nanofiber TiO2/Fe3O4/Ag nanoheterojunctions as the shell; and Ag nanoparticles with diameter of approximately 4 nm are loaded both on TiO2 nanofibers and inside the cavities of sea urchin-like Fe3O4@TiO2 nanocomposites uniformly. Ag nanoparticles lead to the production of more photogenerated charges in the TiO2/Fe3O4/Ag heterojunction via LSPR absorption, and enhance the band-gap absorption of TiO2, while the Fe3O4 cocatalyst provides the active sites for oxygen reduction by the effective transfer of photogenerated electrons to oxygen. So the photocatalytic performance is improved due to the synergistic effect of TiO2/Fe3O4/Ag nanoheterojunctions. As photocatalysts under UV and visible irradiation, the as-synthesized nanocomposites display enhanced photocatalytic and recycling properties for the degradation of ampicillin. Moreover, they present better broad-spectrum antibiosis under visible irradiation. The enhanced photocatalytic activity and excellent chemical stability, in combination with the magnetic recyclability, makes this multifunctional nanostructure a promising candidate for antibiosis and remediation in aquatic environmental contamination in the future.