Preparation and Performance Study of S-Doped g-C3N4 Photocatalyst

• Published in: Integrated ferroelectrics Vol. 240; no. 3; pp. 435 - 444
• Main Authors: Haijun, Wang, Yanning, Yang, Yu, Fan, Chongyang, Hu
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis 23.03.2024; Taylor & Francis Ltd
• Subjects: Carbon nitride; CN nanosheet; Doppler effect; Performance degradation; Performance enhancement; Photocatalysis; Photocatalysts; Photodegradation; Red shift; Rh B; SCN nanosheet; X ray photoelectron spectroscopy
• ISSN: 1058-4587; 1607-8489
• DOI: 10.1080/10584587.2024.2324671

In order to further improve the photocatalytic performance of pure CN, SCN (1:1), SCN (1:2), and SCN (2:1) photocatalysts were prepared using a one-step thermal polymerization method. The morphology of the prepared pure CN and SCN was characterized using SEM, XRD, UV, PL, and XPS to identify the reasons for their improved performance. Proved the photocatalytic degradation effect of prepared CN and SCN on RhB solution. The photocatalytic degradation efficiency of RhB by SCN (1:1) is 90.3%, which is nearly 1.72 times higher than that of CN52.38%. After a series of characterization, it was found that the SCN photocatalyst layer is thinner than the CN photocatalyst layer, and a large number of micron sized pores are distributed on the surface of SCN, increasing the specific surface area of SCN. Introducing an appropriate mass ratio of S element will improve the crystallinity of SCN photocatalysts. An appropriate mass ratio of SCN can reduce the band gap, which decreases from 2.70 eV corresponding to CN to 2.62 eV (1:1) of SCN. The photoresponse range undergoes a red shift, which is beneficial for the photocatalytic reaction and thus improves the performance of the photocatalyst. SCN can inhibit the recombination of photo generated electrons and holes, and improve the activity of photocatalysts.