Abstract
Methylene blue (MB), as a typical pollutant in industrial dyestuff wastewater, has caused serious water pollution. Therefore, reduced graphene oxide (rGO)/TiO2 nanocomposites were synthetized by a simple hydrothermal technique and used as photocatalyst to degrade MB. It was illustrated when TiO2 nanoparticles were loaded 5wt.% rGO framework, nanocomposite had a huge specific surface area of 176.45 m2 g−1 and the average pore size of 4.25 nm. Effects of the rGO fraction in rGO/TiO2 photocatalyst, the rGO/TiO2 photocatalyst content, the initial pH, and the initial MB concentration on MB degradation efficiency were studied. The degradation efficiency about 98.18% was acquired at 5rGO/TiO2 content of 0.4 g L−1, pH = 6, MB concentration of 60 mg L−1. The degradation efficiency of 5rGO/TiO2 for MB was still as high as 86.24% after the tenth cycles, demonstrating rGO/TiO2 nanocomposites were useful for the practical application. The potential photocatalytic mechanism of rGO/TiO2 for MB degradation was immediate oxidative degradation procedure, and the combined action of \({O}_{2}^{\bullet -}\), \({OH}^{\bullet }\) and h+ can contribute to the photocatalytic degradation of MB. Furthermore, the photocatalytic degradation kinetic of rGO/TiO2 for MB under UV irradiation was first-order model.
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This work was supported by Science and Technology Planning Project in Panzhihua City, China (No. 2021ZD-G-10), and Sichuan Province Key Laboratory of Higher Education Institutions for Comprehensive Development and Utilization of Industrial Solid Waste in Civil Engineering, China (No. SC_FQWLY-2021-Y-13).
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Gao, W., Li, Y., Zhao, J. et al. Photocatalytic Degradation of Methylene Blue from Aqueous Solutions by rGO/TiO2 Nanocomposites. Water Air Soil Pollut 234, 437 (2023). https://doi.org/10.1007/s11270-023-06418-1
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DOI: https://doi.org/10.1007/s11270-023-06418-1