首页|Visible-light-driven photocatalytic degradation of atrazine over Ag 2 O-BaTiO 3 S-scheme heterojunction photocatalyst
Visible-light-driven photocatalytic degradation of atrazine over Ag 2 O-BaTiO 3 S-scheme heterojunction photocatalyst
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NETL
NSTL
Elsevier
Water pollution is one of the more significant worldwide problems; notably, water pollution caused by harmful herbicides like Atrazine negatively influences the health of individuals and the ecosystem. The rendering of conventional methods is ineffective for treating antibiotic-laden wastewater. Currently, photocatalytic technology has emerged as a promising solution for degrading low-concentration, water-soluble herbicide residues through deep mineralization. Here, we showed a hydrothermally-prepared BaTiO3 coupled with different contents of narrow-bandgap silver oxide (Ag2O) nanocrystals. The synthesized materials underwent advanced characterization, which verified the successful formation of nanostructured Ag2O-BaTiO3. These heterostructures exhibited high specific surface areas (80-120 m(2)/g) while their fundamental structural and surface integrity remained intact. The photocatalytic performance of the prepared materials was further assessed for atrazine mineralization and degradation efficiency in aqueous solutions under visible-light irradiation. Optimal doping with trace concentrations of Ag2O significantly improved light absorption, charge carrier mobility, and separation efficiency while reducing the material's bandgap to 2.66 eV. The composite containing just 3wt% Ag2O achieved complete photoelimination of atrazine under visible light within 1 hour, outperforming pure BaTiO3 (8.0 +/- 0.5)%. Notably, the 3wt% Ag2O-BaTiO3 heterostructures exhibited a significantly enhanced kinetic rate constant of 4.28x10(-2) min(-1), similar to 32.7-fold compared to pure BaTiO3. Additionally, the heterostructures demonstrated exceptional recyclability in repeated atrazine photodegradation cycles, highlighting their practical applicability. A plausible mechanism for charge carrier separation within mesoporous Ag2O-BaTiO3 heterostructures was proposed, elucidating their enhanced photocatalytic activity. This study concludes that photocatalysts based on perovskite titanates will likely be utilized for water treatment purposes.
NETL
NSTL
Elsevier
