高等学校化学学报 ›› 2025, Vol. 46 ›› Issue (4): 20240488.doi: 10.7503/cjcu20240488

• 物理化学 • 上一篇    下一篇

N缺陷g-C3N5/CdS/Ti3C2异质结光催化剂的制备及高效去除NO性能

康莎, 章柯(), 卫亚静, 王传义()   

  1. 陕西科技大学环境科学与工程学院, 西安 710021
  • 收稿日期:2024-10-29 出版日期:2025-04-10 发布日期:2025-01-03
  • 通讯作者: 章柯,王传义 E-mail:kezhang@sust.edu.cn;wangchuanyi@sust.edu.cn
  • 基金资助:
    国家自然科学基金(52161145409);陕西省教育厅科学研究计划项目(23JP011)

Insitu Construction of N-defective g-C3N5/CdS/Ti3C2 Schottky Junction for High-efficiency Photocatalytic NO Removal

KANG Sha, ZHANG Ke(), WEI Yajing, WANG Chuanyi()   

  1. School of Environmental Science and Engineering,Shaanxi University of Science and Technology,Xi’an 710021,China
  • Received:2024-10-29 Online:2025-04-10 Published:2025-01-03
  • Contact: ZHANG Ke, WANG Chuanyi E-mail:kezhang@sust.edu.cn;wangchuanyi@sust.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(52161145409);the Scientific Research Program of Education Department of Shaanxi Provincial Government, China(23JP011)

摘要:

采用简单的溶剂热法合成了一系列具有N空位的g-C3N5/CdS/Ti3C2复合光催化剂. 通过缺陷工程和异质结的协同作用, 所设计的最佳比例g-C3N x /CdS/Ti3C2复合材料的光催化性能分别是g-C3N x 和CdS的2.7和2.4倍. 由于光吸收率的提高和界面电荷迁移的改善, 在可见光照射下, 10 min内g-C3N x /CdS/Ti3C2对流动反应器内的NO去除率达到60.21%, NO2的生成率仅为2.08%. 通过电子顺磁共振(EPR)和捕获实验分析了活性物种并推断出光生载流子的迁移途径. 此外, 通过原位漫反射傅里叶变换红外光谱(in-situ DRIFTS)进一步揭示了g-C3N x /CdS/Ti3C2体系光催化去除NO的机理. 研究结果为利用空位工程和异质结构的协同作用有效去除NO提供了新的思路和实验依据.

关键词: 光催化, NO, g-C3N x, Ti3C2, CdS

Abstract:

The synergy of two widely developed modulation techniques, defect engineering and heterostructure construction, was integrated to substantially improve photocatalytic performance and a series of N-defective g-C3N5/CdS/Ti3C2 photocatalysts were successfully constructed. Through the rational combination of vacancy engineering and multi-component charge transfer mode, the photocatalytic performance of the designed optimal g-C3N x /CdS/Ti3C2 photocatalyst reached equilibrium at 60.21% within 10 min of visible light irradiation in a flow reactor, which was 2.7 and 2.4 times that of pure g-C3N x and CdS, respectively. Furthmore, the NO2 production rate of g-C3N x /CdS/Ti3C2 is several times lower than other catalysts. Additionally, the charge carrier transfer pathway was deduced by analyzing the active species via electron paramagnetic resonance(EPR) and trapping experiment. The in-situ diffuse reflectance Fourier transform infrared spectroscopy(in-situ DRIFTS) experiment further revealed the mechanism of photocatalytic removal of NO in the g-C3N x /CdS/Ti3C2 system. This research provides a new standpoint for the reasonable design of vacancy engineering and heterogeneous structures for effective NO removal.

Key words: Photocatalysis, NO, g-C3N x, Ti3C2, CdS

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