Preparation of multi-dimensional (1D/2D/3D) carbon/g-C3N4 composite photocatalyst with enhanced visible-light catalytic performance
| Autor: | Jianfei Zheng, Silong Zhu, Longhui Nie, Junyang Deng |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Composite number chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry Adsorption Reaction rate constant chemistry Chemical engineering Photocatalysis Rhodamine B 0210 nano-technology Carbon Visible spectrum |
| Zdroj: | Journal of Colloid and Interface Science. 569:320-331 |
| ISSN: | 0021-9797 |
| Popis: | A multi-dimensional (1D/2D/3D) carbon/g-C3N4 composite photocatalyst (CCN) was successfully prepared by a facile method with carbon from cheap absorbent cotton wool. The activities and stabilities of CCN were evaluated by photo-degrading Rhodamine B (RhB) under visible light irradiation. The effect of carbon content in composite on the catalytic activities was investigated. The results show that a good interfacial contact can be observed between g-C3N4 and carbon materials in CCN. It reveals an enhanced photocatalytic activity in photocatalytic decomposition of RhB compared with g-C3N4. The carbon content has obvious effect on the performance of CCN, and the optimal carbon content in CCN is 1 wt% (CCN1.0). The first-order rate constant (k) of CCN1.0 is approximately 5.5 and 3.4 times those of g-C3N4 and AC1.0/g-C3N4. The CCN1.0 catalyst also shows the excellent photocatalytic stability in the recycling experiments. The enhanced catalytic performance of CCN is mainly due to an increase in electron-hole pair separation efficiency and visible light adsorption after coupling carbon. The hole and •O2– radicals are the main active species, and •O2– plays a more important role than h+. The photocatalytic mechanism over CCN1.0 was proposed. This work will provide a new insight to prepare highly-efficient g-C3N4-based photocatalysts. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect