Exploiting the efficiency of narrow band gap S-doped g-C3N4/Expanded Perlite/Red Ocher nanocomposite for high-level eliminating halogenated dye in Cool-White-SMD/H2O2 system

Abstract

Hitherto, constructing prominent visible-light-driven g-C3N4/soil composites still suffers from several intricacies, including low specific surface area, inadequate charge separation, and a high band gap energy (Eg >2.7eV). To address these drawbacks, sulfur atoms were introduced into g-C3N4 (S-doped g-C3N4 or SCN); thereby, Red Ocher (RO) and Expanded Perlite (EP) were grafted to SCN, which the engineered SCN/10EP/20RO nanocomposite divulged a higher specific surface area, further light-harvesting capability, narrower Eg, prolonged charge recombination process, lower the charge transfer resistance, and higher photocurrent density than bulk g-C3N4 (CN). Additionally, the formed S-scheme charge migration mechanism and the hole-trapping role of the hydroxyl functional groups synergistically engendered robust visible-light-driven catalytic performances under visible-light exposure. By enabling the heterogeneous photo-Fenton-like process, the Methylene Blue removal efficiency (MBRE) and the Total Organic Carbon (TOC) decontamination promptly elevated to 99.6% and 87.7% within 90min under Cool-White-SMD/H2O2 condition, respectively. Manifestly, the kinetic reaction rate of the photo-Fenton-like process was 7.5 times higher than the primary photocatalysis, showcasing HO•had a determining role towards decent decomposing MB. After overviewing, our detailed findings straightforwardly corroborated that SCN/10EP/20RO nanocomposite would be an efficient, long-lasting, and green photocatalyst for eradicating halogenated organic pollution.