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Highly efficient dye wastewater treatment by photocatalytic catalysis commonly requires expensive catalysts, long time degradation and complicated procedure. Here, we for the first time prepared the cheap graphene-doped TiO2 microspheres with simple procedure to degrade dye with high efficiency. When the catalyst concentration was 0.2 g·L−1, the photocatalysis degradation extent of methylene blue solution, methylene green solution and 1, 9-dimethyl methylene blue solution reached 96.4, 85.9 and 98.7%, respectively. The results showed that the degradation reactions accorded with Langmuir-Hinshelwood (L-H) model, and the photocatalytic reactions belonged to a first-order reaction in the primary stage. Furthermore, the different photocatalytic degradation mechanisms were proposed, which have not been found in other literatures. This work opened a new route for simple preparation of cheap microspheres in photocatalytic dye wastewater treatment with high efficiency.

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