In situ synthesis of sulfur doped carbon nitride with enhanced photocatalytic performance using DBD plasma treatment under H2S atmosphere

Abstract

Dielectric barrier discharge (DBD) plasma is considered to be a promising method to synthesize and modify solid catalyst. In this work, DBD plasma was used to synthesize S-doped g-C3N4 catalyst in situ under H2S atmosphere for the first time. XRD, N2 adsorption, UV-Vis, SEM, XPS, EIS, and PL were used to characterize the obtained catalysts. The photocatalytic RhB degradation of as-prepared catalyst was investigated. The results show that, compared with traditional roasting method, H2S plasma treatment can dope more sulfur into g-C3N4 lattice. Such high sulfur content has a significant impact on the morphology, optical property, and electronic structure of the catalyst. The sulfur doped g-C3N4 prepared by plasma treatment displays much higher RhB degradation rate than that prepared by traditional roasting method. This work provides a new strategy for synthesizing heteroatoms doped g-C3N4 based catalyst.