Facile microwave-assisted green synthesis of Ag-ZnFe2O4@rGO nanocomposites for efficient removal of organic dyes under UV- and visible-light irradiation
Facile microwave-assisted green synthesis of Ag-ZnFe2O4@rGO nanocomposites for efficient removal of organic dyes under UV- and visible-light irradiation
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DOI：
10.1016/j.apcatb.2016.10.033
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发表时间：
2017-04-01
影响因子：
22.1
通讯作者：
Shim, Jae-Jin
中科院分区：
文献类型：
--
作者：
Mady, Amr Hussein;Baynosa, Marjorie Lara;Shim, Jae-Jin
采用一锅微波辅助自组装方法合成了Ag-ZnFe2O4@还原氧化石墨烯（rGO）纳米复合材料。对Ag-ZnFe2O4@rGO纳米复合材料的形貌和结构进行了表征。由 15.2 wt% rGO 形成的纳米复合材料对亚甲基蓝 (MB)、罗丹明 B (RhB) 和甲基橙 (MO) 的降解表现出优异的吸附性能和高光催化活性。 Ag、ZnFe2O4 和 rGO 之间的协同相互作用减少了纳米颗粒 (NP) 的聚集并增加了表面积，从而产生了更好的效果。吸收紫外线和可见光。这种结构有助于分离光激发电子空穴对并加速电子转移。电化学阻抗谱（EIS）显示，与裸露的 ZnFe2O4 纳米颗粒和 ZnFe2O4@rGO 纳米复合材料相比，固态界面层的电阻和复合材料表面的电荷转移更小。 Ag-ZnFe2O4@rGO纳米复合材料可以通过磁铁轻松回收并重复使用五次，光催化活性没有显着下降。所制备的Ag-ZnFe2O4@rGO纳米复合催化剂由于其在紫外光和可见光下的高效性以及优异的可重复使用性，可应用于难以降解的废物的去除。 (C) 2016 Elsevier B.V. 保留所有权利。
Nanocomposites of Ag-ZnFe2O4@reduced graphene oxide (rGO) were synthesized using a one-pot microwave-assisted self-assembly method. The morphology and structure of the Ag-ZnFe2O4@rGO nanocomposites were characterized. The nanocomposites formed with 15.2 wt% rGO showed excellent adsorption properties and high photocatalytic activity for the degradation of methylene blue (MB), rhodamine B (RhB), and methyl orange (MO). The synergistic interactions between Ag, ZnFe2O4, and rGO decreased the aggregation of the nanoparticles (NPs) and increased the surface area, resulting in better. absorption in both UV and visible light. Such a structure was helpful for separating the photo excited electron-hole pairs and accelerating electron transfer. Electrochemical impedance spectroscopy (EIS) revealed a smaller resistance in the solid-state interface layer and charge transfer on the composite surface than that of the bare ZnFe2O4 NPs and ZnFe2O4@rGO nanocomposite. The Ag-ZnFe2O4@rGO nanocomposite could be recovered easily by a magnet and reused five times with no significant decrease in photocatalytic activity. The as-prepared Ag-ZnFe2O4@rGO nanocomposite catalyst could be applied to the removal of hard-to-degrade waste materials owing to its high efficiency in both UV and visible light and its excellent reusability. (C) 2016 Elsevier B.V. All rights reserved.