4.5 Article

Highly efficient and cheap treatment of dye by graphene-doped TiO2 microspheres

Journal

WATER SCIENCE AND TECHNOLOGY
Volume 83, Issue 1, Pages 223-232

Publisher

IWA PUBLISHING
DOI: 10.2166/wst.2020.545

Keywords

composite microspheres; dye wastewater; graphene; titanium dioxide; treatment

Funding

  1. Self-financing Project of Science and Technology Research in Colleges and Universities of Hebei Province [z2018007]
  2. Natural Science Foundation of Hebei Province [B2019408018]
  3. Fundamental Research Funds for the Universities in Hebei Province [JYQ201902]

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The study successfully achieved highly efficient degradation of dyes using cheap graphene-doped titanium dioxide microspheres prepared with a simple method. The experimental results were in line with the Langmuir-Hinshelwood model, and the photocatalytic reactions were first-order reactions in the primary stage. Additionally, new photocatalytic degradation mechanisms were proposed in this work.
Highly efficient dye wastewater treatment by photocatalytic catalysis commonly requires expensive catalysts, long degradation time and a complicated procedure. Here, we for the first time prepared cheap graphene-doped titanium dioxide microspheres with a simple procedure to degrade dye with high efficiency. When the catalyst concentration was 0.2 g center dot 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 the Langmuir-Hinshelwood model, and the photocatalytic reactions belonged to a first-order reaction in the primary stage. Furthermore, different photocatalytic degradation mechanisms were proposed, which have not been found in other literature. This work opened a new route for simple preparation of cheap microspheres in photocatalytic dye wastewater treatment with high efficiency.

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