In this work, dual defects mediated W₁₈O₄₉/g-C₃N_4−x heterojunction was prepared by in-situ hydrothermal method. The conversion from Ⅱ-type to Z-scheme heterojunction was achieved due to the formation of build-in electric field from g-C₃N_4−x to W₁₈O₄₉. Tests results indicated that the LSPR hot electrons of W₁₈O₄₉ could directly drive oxygen reduction reaction to generate O₂⁻ species and the partial electrons of g-C₃N_4−x were captured by O defect states of W₁₈O₄₉ to stabilize its free charge density, resulting in the continuous generation of high-energy hot electrons. The photo-generated carriers had the stronger redox ability compared with g-C₃N_4−x and W₁₈O₄₉ due to the Z-scheme charge transfer paths. Combined with the promoted exciton dissociation induced by N vacancies, the enhanced light absorption and accelerated carriers’ separation induced by near-field enhancement effect in visible-NIR range of oxygen vacancies, W₁₈O₄₉/g-C₃N_4−x heterojunction exhibited enhanced photocatalytic performance for NO removal and full-solar-spectrum-driven pollutants degradation.

在这项工作中，通过原位水热法制备了双缺陷介导的W ₁₈ O ₄₉ / gC ₃ N _4-x异质结。由于从gC ₃ N _4-x到W ₁₈ O ₄₉的内建电场的形成，实现了从Ⅱ型到Z型异质结的转换。测试结果表明，W的LSPR热电子₁₈ ö ₄₉可以直接驱动的氧还原反应，生成ö ₂ ^-物种和GC的部分电子₃ Ñ _4-X通过的W 0缺陷态捕获₁₈O ₄₉稳定其自由电荷密度，导致连续产生高能热电子。由于z方案的电荷转移路径，与gC ₃ N _4-x和W ₁₈ O ₄₉相比，光生载流子具有更强的氧化还原能力。结合N空位引起的激子解离促进，在可见空域N ₁₈的氧空位，W ₁₈ O ₄₉ / gC ₃ N _4-x下，近场增强效应增强了光吸收，加速了载流子的分离。 异质结表现出增强的光催化性能，可用于去除NO和全光谱驱动的污染物降解。