Citation: Li Xiaowei, Wang Bin, Yin Wenxuan, Di Jun, Xia Jiexiang, Zhu Wenshuai, Li Huaming. Cu²⁺ Modified g-C₃N₄ Photocatalysts for Visible Light Photocatalytic Properties[J]. Acta Physico-Chimica Sinica, ;2020, 36(3): 190200. doi: 10.3866/PKU.WHXB201902001 shu

Cu²⁺ Modified g-C₃N₄ Photocatalysts for Visible Light Photocatalytic Properties

School of Chemistry and Chemical Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang 212013, Jiangsu Province, P. R. China

Corresponding author: Xia Jiexiang, xjx@ujs.edu.cn Zhu Wenshuai, zhuws@ujs.edu.cn
Received Date: 1 February 2019
Revised Date: 3 May 2019
Accepted Date: 13 May 2019
Available Online: 17 March 2019
Fund Project: the National Natural Science Foundation of China 21576122the National Natural Science Foundation of China 21722604Chinese Postdoctoral Science Foundation 2017M611726the National Natural Science Foundation of China (21722604, 21576122), Chinese Postdoctoral Science Foundation (2017M611726) and Postgraduate Research & Practice Innovation Program of Jiangsu Province, China (SJKY19_2573)Postgraduate Research & Practice Innovation Program of Jiangsu Province, China SJKY19_2573

Photocatalytic technology can effectively solve the problem of increasingly serious water pollution, the core of which is the design and synthesis of highly efficient photocatalytic materials. Semiconductor photocatalysts are currently the most widely used photocatalysts. Among these is graphitic carbon nitride (g-C₃N₄), which has great potential in environment management and the development of new energy owing to its low cost, easy availability, unique band structure, and good thermal stability. However, the photocatalytic activity of g-C₃N₄ remains low because of problems such as wide bandgap, weakly absorb visible light, and the high recombination rate of photogenerated carriers. Among various modification strategies, doping modification is an effective and simple method used to improve the photocatalytic performance of materials. In this work, Cu/g-C₃N₄ photocatalysts were successfully prepared by incorporating Cu²⁺ into g-C₃N₄ to further optimize photocatalytic performance. At the same time, the structure, morphology, and optical and photoelectric properties of Cu/g-C₃N₄ photocatalysts were analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy, UV-Vis diffuse reflectance spectroscopy (DRS), and photoelectric tests. XRD and XPS were used to ensure that the prepared photocatalysts were Cu/g-C₃N₄ and the valence state of Cu was in the form of Cu²⁺. Under visible light irradiation, the photocatalytic activity of Cu/g-C₃N₄ and pure g-C₃N₄ photocatalysts were investigated in terms of the degradation of RhB and CIP by comparing the amount of introduced copper ions. The experimental results showed that the degradation ability of Cu/g-C₃N₄ photocatalysts was stronger than that of pure g-C₃N₄. The N₂ adsorption-desorption isotherms of g-C₃N₄ and Cu/g-C₃N₄ demonstrated that the introduction of copper had little effect on the microstructure of g-C₃N₄. The small difference in specific surface area indicates that the enhanced photocatalytic activity may be attributed to the effective separation of photogenerated carriers. Therefore, the enhanced photocatalytic degradation of RhB and CIP over Cu/g-C₃N₄ may be due to the reduction of carrier recombination rate by copper. The photoelectric test showed that the incorporation of Cu²⁺ into g-C₃N₄ could reduce the electron-hole recombination rate of g-C₃N₄ and accelerate the separation of electron-hole pairs, thus enhancing the photocatalytic activity of Cu/g-C₃N₄. Free radical trapping experiments and electron spin resonance indicated that the synergistic effect of superoxide radicals (O₂^•−), hydroxyl radicals (•OH) and holes could increase the photocatalytic activity of Cu/g-C₃N₄ materials.
- Cu/g-C₃N₄,
- Photocatalytic,
- Visible light,
- Active species,
- RhB,
- CIP
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Cu2+ Modified g-C3N4 Photocatalysts for Visible Light Photocatalytic Properties

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Cu²⁺ Modified g-C₃N₄ Photocatalysts for Visible Light Photocatalytic Properties