Construction of a Novel Solar‐Light‐Driven Bismuth Titanate/Barium Titanate Photocatalyst for Significantly Enhanced Purification of Nitric Oxide

Abstract Photocatalytic denitrification is a promising approach for environmental remediation and solar energy conversion. In this study, a series of Bi 2 Ti 2 O 7 /BaTiO 3 heterojunctions were synthesized via hydrothermal method, demonstrating superior photocatalytic NO removal efficiency (94%) compared to individual components. Comprehensive characterizations confirmed the formation of a tightly coupled heterojunction with enhanced visible‐light absorption and charge separation. Optical and electrochemical analyses revealed that the composite facilitates efficient electron‐hole separation (supported by reduced PL intensity and lower charge‐transfer resistance in EIS) while retaining strong redox potentials, consistent with an S‐scheme charge‐transfer mechanism. Additionally, the increased surface area (BET) and porosity further promote reactant adsorption. Trapping experiments and electron paramagnetic resonance (EPR) confirmed that e⁻, h⁺, and ·O 2 ⁻ are key reactive species. The synergistic effects of improved charge dynamics, optimized light utilization, and interfacial electron transfer collectively contribute to the enhanced photocatalytic performance.