College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, People's Republic of China. Wenzhou Institute of Science and Technology, Zhejiang University of Technology, Wenzhou 325011, People's Republic of China. Zhejiang Shuaikang Electric Co., Ltd, Ningbo 315491, People's Republic of China.
Nanotechnology. 2019 Aug 2;30(31):315706. doi: 10.1088/1361-6528/ab116a. Epub 2019 Mar 20.
This paper reports on highly active ZnFeO/reduced graphene oxide (ZnFeO/rGO) nanocomposites synthesized by a modified sol-gel method. The as-prepared samples have been characterized by XRD, TEM, XPS and other detection methods, which demonstrate that ZnFeO nanoparticles (NPs) with a diameter of 15 ∼ 50 nm were densely grown on the rGO substrates. The photocatalytic activities of ZnFeO/rGO catalysts were evaluated by the degradation of Methylene blue (MB) under visible light. The results showed that the ZnFeO/rGO catalysts had high photocatalytic activity, and the degradation efficiency of MB was almost 100% within 180 min. Moreover, the ZnFeO/rGO catalysts also had a great removal effect on Rhodamine B (RhB) and Methyl orange (MO). Mechanistic studies revealed that the rGO acted as a stabilizer to prevent ZnFeO from aggregation and improved the separation of photo-generated electrons. The high efficiency for dye degradation was attributed to the generation of hydroxyl radicals (·OH) via the photochemical decomposition of HO on ZnFeO/rGO catalysts, which was responsible for the oxidation of the dyes. Of note, the ZnFeO/rGO catalyst maintained an efficiency of over 90% after five cycles. The XRD, XPS and VSM characterization revealed that the ZnFeO/rGO catalysts had a stable crystal structure and can be easily separated.
本文报道了通过改进的溶胶-凝胶法合成的高活性 ZnFeO/还原氧化石墨烯（ZnFeO/rGO）纳米复合材料。所制备的样品通过 XRD、TEM、XPS 等检测方法进行了表征，结果表明，直径为 15~50nm 的 ZnFeO 纳米颗粒（NPs）在 rGO 基底上密集生长。通过可见光下亚甲基蓝（MB）的降解评价了 ZnFeO/rGO 催化剂的光催化活性。结果表明，ZnFeO/rGO 催化剂具有高的光催化活性，在 180min 内 MB 的降解效率几乎达到 100%。此外，ZnFeO/rGO 催化剂对 Rhodamine B（RhB）和 Methyl orange（MO）也有很好的去除效果。机理研究表明，rGO 作为稳定剂，防止 ZnFeO 聚集，并提高光生电子的分离效率。高效的染料降解归因于 ZnFeO/rGO 催化剂上 HO 的光化学分解产生羟基自由基（·OH），这负责染料的氧化。值得注意的是，ZnFeO/rGO 催化剂在五次循环后仍保持超过 90%的效率。XRD、XPS 和 VSM 表征表明，ZnFeO/rGO 催化剂具有稳定的晶体结构，易于分离。
