Diethylenetriamine-CdS hybrid materials (CdS-DETA) loaded nitrogen-rich carbon nitride (g-C3N5) for enhanced hydrogen production and photocatalytic degradation: Enhancement based on band bending

• Published in: Separation and purification technology 2023-01, Vol.304, p.122375, Article 122375
• Main Authors: Yang, Huixing, Li, Wei, Jiang, Yangyang, Wei, Qiuming, Hou, Linlin, Wu, Zhiliang, He, Qinyu, Wang, Yinzhen, Tang, Dingyuan
• Format: Article
• Language: English
• Subjects: CdS-DETA; Degradation; Diethylenetriamine; G-C3N5; Hydrogen evolution; Photocatalyst
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2022.122375

•A bulk nitrogen-rich carbon nitride (g-C3N5) photocatalyst was prepared.•Design and synthesis CdS-DETA@g-C3N5, which exhibit excellent performance for H2 evolution (14.2 mmol·g−1·h−1) and ofloxacin degradation (95.4 %).•Enhance the bending of the energy band by adding diethylenetriamine (DETA). The proper design of photocatalysts is essential to improving photocatalytic decomposition of water and degradation of pollutants. In this work, we used nitrogen-rich carbon nitride with high electronic properties combined with CdS-DETA to generate CdS-DETA@g-C3N5 composite, and diethylenetriamine (DETA) was used to enhance the band bending to enable the excellent photocatalytic performance of the photocatalyst. The hydrogen evolution rate (14.23 mmol/(g·h)) of the CdS-DETA@g-C3N5 composite is 7.1, 7.5, and 4.5 times higher than that of g-C3N5 (2.03 mmol/(g·h)), 20CSCN5 (1.89 mmol/(g·h)), and CdS-DETA (3.17 mmol/(g·h)), and the OFLX degradation rate (95.6 %) is 3.4 and 1.5 times higher than that of g-C3N5 and CdS-DETA, respectively. These performance enhancements result from the enhancement of energy band bending, the construction of a built-in electric field (IEF), and the retention of high redox carriers. This work provides new insights into the design of nitrogen-rich carbon nitride-based photocatalyst for efficient photocatalytic degradation and hydrogen precipitation activity.