CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
Environ Pollut. 2019 Jun;249:801-811. doi: 10.1016/j.envpol.2019.03.071. Epub 2019 Mar 28.
Degrading aquatic organic pollutants efficiently is very important but strongly relied on the design of photocatalysts. Porous graphene could increase photocatalytic performance of ZnO nanoparticles by promoting the effective charge separation of electron-hole pairs if they can be composited. Herein, porous graphene, ZnO nanoparticles and porous graphene/ZnO nanocomposite were prepared by fine tuning of partial combustion, which graphene oxide imperfectly covered by the layered Zn salt was combusted under muffle furnace within few minutes. Resulting ZnO nanoparticles (32-72 nm) are dispersed uniformly on the surface of graphene sheets, the pore sizes of porous graphene are in the range from ∼3 to ∼52 nm. The synthesized porous graphene/ZnO nanocomposite was confirmed to show enhanced efficiency under natural sunlight irradiation compared with pure ZnO nanoparticles. Using porous graphene/ZnO nanocomposite, 100% degradation of methyl orange can be achieved within 150 min. The synergetic effect of photocatalysis and adsorption is main reason for excellent MO degradation of PG/ZnO nanocomposite. This work may offer a new route to accurately prepare porous graphene-based nanocomposite and open a door of their applications.
高效降解水中有机污染物非常重要，但强烈依赖于光催化剂的设计。多孔石墨烯如果能够复合，可通过促进电子-空穴对的有效电荷分离来提高 ZnO 纳米粒子的光催化性能。本文通过精细调控部分燃烧来制备多孔石墨烯、ZnO 纳米粒子和多孔石墨烯/ZnO 纳米复合材料，即将层状 Zn 盐不完全覆盖的氧化石墨烯在马弗炉中几分钟内燃烧。所得 ZnO 纳米粒子（32-72nm）均匀分散在石墨烯片表面，多孔石墨烯的孔径在 3nm 到 52nm 之间。与纯 ZnO 纳米粒子相比，所合成的多孔石墨烯/ZnO 纳米复合材料在自然光照射下显示出增强的效率。使用多孔石墨烯/ZnO 纳米复合材料，在 150 分钟内可实现甲基橙的 100%降解。光催化和吸附的协同作用是 PG/ZnO 纳米复合材料对 MO 优异降解的主要原因。这项工作可能为准确制备基于多孔石墨烯的纳米复合材料提供了一条新途径，并为它们的应用开辟了一扇大门。
