Abstract To further improve the charge separation and photocatalytic activities of g-C3N4 and CdMoO4 under visible light irradiation, CdMoO4/g-C3N4 composites were rationally synthesized by a facile precipitation-calcination procedure. The crystal phases, morphologies, chemical compositions, textural structures, and optical properties of the as-prepared composites were characterized by the corresponding analytical techniques. The photocatalytic activities toward degradation of rhodamine B solution were evaluated under visible light irradiation. The results revealed that integrating CdMoO4 with g-C3N4 could remarkably improve the charge separation and photocatalytic activity, compared with those of pristine g-C3N4 and CdMoO4. This would be because the CdMoO4/g-C3N4 composites could facilitate the transfer and separation of the photoexcited electron-hole pairs, which was confirmed by electrochemical impedance spectroscopy, transient photocurrent responses, and photoluminescence measurements. Moreover, active species trapping experiments demonstrated that holes (h+) and superoxide radicals (·O2−) were the main active species during the photocatalytic reaction. A possible photocatalytic mechanism was proposed on the basis of the energy band structures determined by Mott-Schottky tests. This work would provide further insights into the rational fabrication of composites for organic contaminant removal.

中文翻译：

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CdMoO4/g-C3N4 复合材料的原位制备在可见光照射下具有改善的电荷分离和光催化活性

摘要 为了进一步提高g-C3N4和CdMoO4在可见光照射下的电荷分离和光催化活性，采用简便的沉淀-煅烧工艺合理合成了CdMoO4/g-C3N4复合材料。通过相应的分析技术对制备的复合材料的晶相、形貌、化学成分、纹理结构和光学性质进行了表征。在可见光照射下评估了降解罗丹明 B 溶液的光催化活性。结果表明，与原始的 g-C3N4 和 CdMoO4 相比，将 CdMoO4 与 g-C3N4 结合可以显着提高电荷分离和光催化活性。这是因为 CdMoO4/g-C3N4 复合材料可以促进光激发电子-空穴对的转移和分离，电化学阻抗谱、瞬态光电流响应和光致发光测量证实了这一点。此外，活性物质捕获实验表明空穴（h+）和超氧自由基（·O2-）是光催化反应过程中的主要活性物质。基于 Mott-Schottky 测试确定的能带结构，提出了一种可能的光催化机制。这项工作将为合理制造用于去除有机污染物的复合材料提供进一步的见解。活性物质捕获实验表明，空穴（h+）和超氧自由基（·O2-）是光催化反应过程中的主要活性物质。基于 Mott-Schottky 测试确定的能带结构，提出了一种可能的光催化机制。这项工作将为合理制造用于去除有机污染物的复合材料提供进一步的见解。活性物质捕获实验表明，空穴（h+）和超氧自由基（·O2-）是光催化反应过程中的主要活性物质。基于 Mott-Schottky 测试确定的能带结构，提出了一种可能的光催化机制。这项工作将为合理制造用于去除有机污染物的复合材料提供进一步的见解。