Enhanced Photocatalytic Activity of Hybrid rGO@TiO2/CN Nanocomposite for Organic Pollutant Degradation under Solar Light Irradiation

Catalysts

Matejka Podlogar¹  Tina Radošević¹  Martina Kocijan²  Lidija Ćurković² 

[1] Department for Nanostructured Materials, Jožef Stefan Institute, Jamova Cesta 39, SI-1000 Ljubljana, Slovenia;Department of Materials, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10000 Zagreb, Croatia;

关键词: graphitic carbon nitride;    reduced graphene oxide;    hydrothermal synthesis;    hybrid;    photocatalysis;    rhodamine B;   

DOI  :  10.3390/catal11091023

来源: DOAJ

【 摘 要 】

The three-component hybrid (rGO/TiO₂/CN) nanocomposite was prepared in order to enhance the photocatalytic properties of anatase TiO₂ nanoparticles (NPs) under solar-like irradiation. The rGO/TiO₂/CN was prepared in a mixture of the reduced graphene oxide (rGO, 8 wt%), anatase TiO₂ nanoparticles (NPs), and graphitic carbon nitride (g-C₃N₄, 16 wt%). It was self-assembled through the one-step hydrothermal method, followed by an annealing process. The photocatalyst was thoroughly characterized by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), the Brunauer-Emmett-Teller (BET) nitrogen adsorption/desorption technique and UV-Vis diffuse reflectance spectroscopy (DRS). The photocatalytic activity of the TiO₂, TiO₂/rGO, TiO₂/CN and hybrid rGO/TiO₂/CN nanocomposite was studied through the degradation of a rhodamine B (RhB) aqueous solution under solar-like irradiation. The results showed that the highest photocatalytic activity was achieved by the rGO/TiO₂/CN mixture, which can be attributed to the synergistic effect of the incorporation of both rGO and g-C₃N₄ with TiO₂. Further, the influence of the pH value of the RhB dye aqueous solution and different water matrix (Milli-Q, tap, and alkaline water) on the photocatalytic efficiency of the rGO/TiO₂/CN nanocomposite was examined. In addition, a recycle test was performed for hybrid rGO@TiO₂/CN to investigate the effectiveness of the photodegradation of RhB dye in three successive cycles. The conducted results indicate that the pH value of RhB dye aqueous solution and water matrices play an important role in the photocatalytic degradation rate.

【 授权许可】

Unknown