具有三维网状结构的石墨相氮化碳/还原氧化石墨烯/钯复合材料的合成及可见光催化性能

摘要

Graphitic carbon nitride (g-C3N4) has been considered as an efficient metal-free semiconductor photocataltyst.To further improve its photocatalytic activity,we have prepared the three-dimensional network-structured g-C3 N4/reduced graphene oxide (rGO)/palladium nanoparticles (Pd NPs) composites by the pyrolysis-hydrothermal two-step method.The composite consists of ultrathin sheets which are decorated with Pd NPs (diameter:～ 10 nm).g-C3N4/rGO/Pd NPs composite shows a broad absorption with an edge at ～460 nm and then an enhanced photoabsorption with the increase of wavelength (460-800 nm).The photocatalytic activity of g-C3N4/rGO/Pd NPs composites was measured by the degradation of RhB solution.Under the irradiation of visible-light (λ＞400 nm),g-C3N4/rGO/Pd NPs composites can degrade 90％ RhB in 140 min.In addition,the cycling experiment demonstrates that the composite possesses good photocatalytic stability.Therefore,g-C3N4/rGO/Pd NPs composites displays a potential as an efficient and stable photocatalyst for water-purification application.%石墨相氮化碳(g-C3N4)已经被认为是一种高效的非金属半导体光催化剂.为进一步优化其光催化性能,通过热解-水热两步法制备了三维网状结构的g-C3N4/还原氧化石墨烯(rGO)/钯纳米颗粒(Pd NPs)复合材料.该复合材料由大量超薄片组成,而且薄片上有大量直径约为10 nm的Pd NPs.g-C3 N4/rGO/Pd NPs复合材料展现了一个宽的可见光吸收(边～460 nm),其在460～800 nm波长范围内还有一个随波长增加的光吸收.经可见光(λ＞400 nm)照射140 min后,g-C3N4/rGO/Pd NPs复合材料可降解90％罗丹明B(RhB).此外,循环实验表明g-C3N4/rGO/Pd NPs复合材料具有良好的稳定性.因此,g-C3N4/rGO/Pd NPs复合材料有望成为一种高效稳定的光催化剂,在水污染处理领域具有潜在的应用价值.