Abstract
As a typical industrial wastewater, paper-making wastewater contains a number of toxic compounds which is harmful to the environment. In this report, TiO2 plates/graphene composite based 2D–2D heterojunctions were synthesized via one-step solvothermal method. The structure and morphology of the as-prepared composite were characterized by Transmission electron microscope (TEM), X-ray diffraction (XRD), and Raman spectra. The results indicated that sheet-like anatase TiO2 with exposed {001} facets was anchored on the graphene nanosheet. In the degradation of papermaking wastewater under UV irradiation, the as synthesized TiO2 plates/graphene composite exhibited higher photocatalytic performance than the commercial Degussa P25. The effects of the amount of catalyst, H2O2 dosage, pH and the time of light irradiation on the photocatalytic efficiency were also discussed. At the optimum condition of 1.0 g ·L-1 RGO/TiO2 with the dosage of 0.3% H2O2 at pH=3, the removal rate of CODCr and chroma could reach 86% and 100%, respectively in 8 h. This work could provide new insights into the wastewater treatment with a well-defined nanocomposite.
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