Reduced graphene oxide modified zinc oxide composites synergistic photocatalytic activity under visible light irradiation
Reduced graphene oxide modified zinc oxide composites synergistic photocatalytic activity under visible light irradiation
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DOI：
10.1016/j.ijleo.2019.163778
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发表时间：
2020-04-01
期刊：
影响因子：
3.1
通讯作者：
Zhang, Hong Yan
中科院分区：
文献类型：
--
作者：
Liu, Wei Meng;Li, Jin;Zhang, Hong Yan
半导体光催化技术被广泛认为是解决全球能源短缺和防止环境退化的潜在解决方案。本文采用一步水热法制备了氧化锌纳米片(NSS)还原氧化石墨烯(RGO)纳米复合材料。用扫描电子显微镜、X射线衍射仪、红外光谱、紫外-可见光谱、漫反射光致发光光谱、X射线光电子能谱对不同rGO含量的ZnO/rGO-x(x=2-12wt%)样品进行了表征，并对其光催化性能进行了评价。在光催化过程中，石墨烯修饰的氧化锌可以实现界面增强，降低电子空穴对的快速复合效率，增强其在可见光区域的吸收。氧化锌含量对其光催化性能有明显影响，在相同条件下，氧化锌/rGO-8样品在80min内就能完全降解亚甲基蓝。纳米复合材料优异的光催化性能归功于氧化锌和氧化锌之间的协同作用。
Semiconductor photocatalytic technology is widely regarded as a potential solution to global energy shortages and defense against environmental degradation. Here we demonstrate zinc oxide (ZnO) nanosheets (NSs)-reduced graphene oxide (rGO) nanocomposites were synthesized by a facile one-step hydrothermal method. The as-obtained ZnO/rGO-x (x = 2-12 wt %) samples with different rGO contents are characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), infra-red (IR) spectroscopy, the ultraviolet-visible spectroscopy (UV-vis), diffuse spectroscopy and photoluminescence (PL), X-ray photoelectron spectroscopy (XPS), and their photocatalytic are also evaluated. In the photocatalytic process, graphene modified zinc oxide can achieve interface enhancement, reduce the fast recombination efficiency of electronhole pairs, and enhance its absorption in the visible area. The content of GO shows an obvious effect on their photocatalytic properties, ZnO/rGO-8 sample can completely degrade methylene blue within 80 min under the same conditions. The excellent photocatalytic properties of the nanocomposites are due to the synergy between ZnO and rGO.