A novel ternary TiO2/CQDs/BiOX (X = Cl, Br, I) heterostructure as photocatalyst for water purification under solar irradiation

作者:Qu, Xiaofei; Liu, Meihua; Yang, Junying; Wang, Chunqi; Meng, Huihui; Li, Shenggang; Shi, Liang*; Du, Fanglin
来源:Journal of Solid State Chemistry, 2018, 264: 77-85.
DOI:10.1016/j.jssc.2018.05.002

摘要

A series of novel binary TiO2/BiOX (X = Cl, Br, I) and ternary TiO2/CQDs/BiOBr hybrid photocatalysts were prepared through a facile hydrothermal method. TiO2/BiOX heterostructures were fabricated by varying the halogen ions. The photocatalysts were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV Vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. Among the binary TiO2/BiOX, TiO2/BiOBr showed the most preferable photocatalytic activities due to suitable band gap alignment and photo stability, reaching almost 80% MO degradation during 180 min irradiation under simulated sunlight. Moreover, the effects of synthesis temperature, Ti/Bi ratio on the composition and structure were investigated, the results indicated TiO2/BiOBr with Bi/Ti = 10% prepared at 120 degrees C possessed the best photocatalytic performance. Carbon quantum dots were introduced to accelerate electrons transfer at interface or prevent charges recombination on the surface, resulting a much better photocatalytic performance for TiO2/CQDs/BiOBr hybrid photocatalysts.