TiO2/reduced hydroxylated graphene nanocomposite photocatalysts: Improved electron–hole separation and migration
Autor: | Huagang Ni, Peng Ye, Kemei Pei, Guoyong Wu, Qin Cunqi, Huihui Deng, Wang Mei |
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Rok vydání: | 2021 |
Předmět: |
Nanocomposite
Materials science Graphene business.industry Oxide 02 engineering and technology Electron hole 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences law.invention Catalysis chemistry.chemical_compound Semiconductor chemistry Chemical engineering law Photocatalysis Degradation (geology) General Materials Science 0210 nano-technology business |
Zdroj: | Materials Chemistry and Physics. 270:124796 |
ISSN: | 0254-0584 |
Popis: | In the catalytic process of semiconductor, the rapid recombination of electron-holes greatly reduces the catalytic activity of the semiconductor catalyst. In this study, a low-defect reduced hydroxylated graphene (RGOH) was used as a carrier material to prepare TiO2/reduced hydroxylated graphene (T/RGOH) nanocomposite photocatalyst by one-step hydrothermal method. The nanocomposite photocatalysts were used to degrade methylene blue (MB). The degradation efficiency of MB catalyzed by T/RGOH nanocomposite photocatalyst was about 48.5% higher than that of the pure TiO2, and about 19.7% higher than that of the TiO2/reduced graphene oxide (T/RGO) nanocomposite photocatalyst. This was because the electrical conductivity of RGOH was much higher than that of RGO, which greatly improved the separation and migration efficiency of photogenerated electron-holes. At the same time, there might exist the Ti–O–C bond in the T/RGOH, which was advantageous to transfer photogenerated electrons through this bond to the RGOH flakes and prevented rapid recombination of photogenerated electron-holes. This study indicated that the preparation of catalyst nanocomposites using RGOH as carrier was an effective method to improve the catalytic performance of semiconductor catalysts. |
Databáze: | OpenAIRE |
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