Applied Surface Science, Vol.459, 9-15, 2018
Highly enhanced photocatalytic performance of TiO2 nanosheets through constructing TiO2/TiO2 quantum dots homojunction
In this paper, TiO2 quantum dots (QDs)/TiO2 nanosheet homojunction is successfully synthesized. The characterization of the TiO(2)QDs/TiO2 homostructures is examined by X-ray diffraction (XRD), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). Homojunction is also proved by Diffuse reflectance ultraviolet-visible (UV-vis) absorption spectra and electrochemical impedance spectroscopies (EIS) analysis. The optimum TiO(2)QDs/TiO2-40 homostructures show a dramatic enhancement of photocatalytic activities (Rhodamine B is thoroughly degraded within 30 min) for organic pollutants degradation. The strong interfacial interaction between TiO2 nanosheets and TiO(2)QDs efficiently reduces the recombination of photogenerated electron-hole pairs and enhance the charge transport. Based on the experimental results, photocatalytic mechanisms for organics degradation over TiO(2)QDs/TiO2 homostructures are proposed. In addition, the system gives no loss in the photocatalytic process after six recycling experiments confirming that the homostructure is stable and anti-photocorroded.