Preparation of Ti3+-TiO2@NGQDs Nanocomposite Photocatalysts and its Visible Light Degradation of Bisphenol A
Ti3+self-doped TiO2 loaded nitrogen doped graphene quantum dots(Ti3+-TiO2@NGQDs)nanocomposite photocatalyst was synthesized through a two-step hydrothermal method,characterized in detail by XRD,TEM,XPS,and UV vis-DRS,and its perform-ance for visible light degradation of bisphenol A solution was studied.The results indicated that the degradation rate of BPA by Ti3+-TiO2@NGQDs composite photocatalysts was as high as 91.9% within 30 minutes of visible light irradiation.The apparent rate constants(k)of bisphenol A degradation with Ti3+-TiO2@NGQDs composite was about 33.6 times that of pure TiO2 and 6.4 times that of Ti3+-TiO2,which was attributed to the synergistic effect of its stronger visible light absorption and faster photo induced charge transfer and separation.The capture experiment results indicated that h+and·OH were the main ac-tive substances in the degradation of bisphenol A by Ti3+-TiO2@NGQDs nanocomposite photocatalyst.In addition,the reusability test results indicated that Ti3+-TiO2@NGQDs nanocomposite photocatalyst had very high stability.
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