Abstract: Carbon dots (CQDs)/TiO2 composites were prepared by condensation reflux with TiO2 and carbon quantum dots (CQDs) which were prepared by hydrothermal method at alkaline conditions,using glucose as carbon quantum dots' source.The carbon dots' solution and materials were characterized by molecular fluorescence and scanning electron microscopy.The adsorption and degradation of methylene blue by CQDs/TiO2 at different pH,different time under ultraviolet lamp and white lamp were studied.The results showed that there was no significant difference between the morphology and structure of CQDs/TiO2 in SEM and XRD,but the difference between CQDs/TiO2 and pure TiO2 in infrared spectra (1090cm-1 and 2354cm-1) and thermogravimetry (400~600℃) showed the existence of carbon dots components.The results of solid UV diffuse reflection showed that the light absorption of CQDs/TiO2 was stronger than that of TiO2 at 200~800nm wavelength.The degradation rate of CQDs/TiO2 to methylene blue solution at the same light source was higher than that of pure TiO2,and the effect of white lamp was better than that of UV lamp,and the degradation rate of methylene blue increased with the increase of pH value,the cycle performance of CQDs/TiO2 at white light was better.
李胜英, 陈慧文, 苏惠, 苏志恒, 冯建海. 碳点/TiO2的制备及对亚甲基蓝的光催化性能[J]. 化工新型材料, 2019, 47(5): 198-202.
Li Shengying, Chen Huiwen, Su Hui, Su Zhiheng, Feng Jianhai. Preparation of CQDs/TiO2 and its photocatalytic activity for methylene blue. New Chemical Materials, 2019, 47(5): 198-202.
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