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采用溶剂热法在醋酸锌的乙醇溶液中制备出了纳米氧化锌(ZnO);然后利用葡萄糖为原料,通过热裂解的方法制备石墨烯量子点(GQDs);再将二者混合制备不同比例的ZnO-GQDs复合材料,对材料的形貌、晶相结构和光谱特性进行表征,并以罗丹明B为目标降解物考察了其光催化性能。结果表明:以汞灯光照120min,纳米ZnO、GQDs和ZnOGQDs-0.3复合材料对罗丹明B的降解率分别达到81.91%、43.26%和90.24%。复合材料光催化活性的提高,主要归因于适量引入GQDs可以更好地吸附有机染料,同时促进ZnO光生载流子的有效分离,降低其复合率。
Nano zinc oxide (ZnO) was prepared by solvothermal method in ethanol solution of zinc acetate. Then, grapheme quantum dots (GQDs) were prepared by thermal pyrolysis using glucose as raw material, and then the two were mixed to prepare different proportions of ZnO-GQDs composites, the morphology, crystal phase structure and spectral properties of the material were characterized. The photocatalytic activity of Rhodamine B as a degradation product was investigated. The results showed that the degradation rates of Rhodamine B by nano-ZnO, GQDs and ZnOGQDs-0.3 composites reached 81.91%, 43.26% and 90.24% respectively with mercury lamp illumination for 120 min. The increase of photocatalytic activity of the composites is mainly attributed to the proper introduction of GQDs to better adsorb organic dyes and promote the efficient separation of ZnO photo-generated carriers and reduce the recombination rate.