Visible-Light-Driven photocatalytic oxidation of H₂S by Boron-doped TiO₂/LDH Heterojunction: Synthesis, performance, and reaction mechanism

Hydrogen sulfide (H₂S), a highly toxic, malodorous, and corrosive gas, poses a serious threat to the atmospheric environment and human health. It is highly attractive to design high-performance desulfurization photocatalyst in environmental remediation. Herein, a novel and highly efficient photocatalyst boron-doped TiO₂ combined with MgAl-Layered double hydroxides (B-TiO₂/LDH) was synthesized via an in-situ hydrothermal method. The B-TiO₂/LDH photocatalyst exhibited outstanding photocatalytic performance with 100% H₂S removal efficiency within 120 min under visible light irradiation. The B-TiO₂/LDH photocatalyst also exhibits a good H₂S removal efficiency in different desulfurization conditions and delivers remarkable stability in a long-term test. The sulfate formed on the surface of B-TiO₂/LDH has been shown to favor the light-enhanced catalytic oxidation process. This work provides a promising idea for effectively treating malodorous gas and shows potential of using the novel B-TiO₂/LDH photocatalyst for future environmental remediation.