增强可见光催化活性的Z型MoO3/Bi2O4复合光催化剂的制备

doi:10.1016/S1872-2067(19)63391-7

摘要/Abstract

摘要： 全球工业化进程的加快使人们饱受环境污染问题的困扰.半导体光催化技术作为一种高效、绿色、有潜力的新技术，在环境净化方面有着广阔的应用前景.Bi₂O₄是近年来新开发出的一种铋基光催化剂，在环境净化方面已有一些研究.但是，单体光催化剂通常存在光响应范围窄、光生载流子复合率高等问题，这些不足限制了Bi₂O₄的进一步应用.因此，需要通过适当的改性来拓宽其光响应范围和提高其载流子的分离效率，从而提高其光催化活性.构建Z型异质结被认为是提高光催化剂光生载流子分离效率并进一步提高光催化活性的有效方法.MoO₃是一种宽禁带的n型半导体，具有独特的能带结构、光学特性和表面效应，是一种非常有前景的半导体光催化剂.虽然MoO₃材料的光生载流子复合率高，带隙（2.7-3.2 eV）大，不利于其参与光催化反应，但MoO₃与其他合适的半导体配位形成复合材料后能够有效提高其光生载流子的分离效率，从而提高其光催化活性.
本研究采用简单的水热法制备了一种新型Z型MoO₃/Bi₂O₄复合光催化剂，SEM和TEM分析结果表明，MoO₃和Bi₂O₄紧密结合在一起.X射线光电子能谱分析表明，MoO₃和Bi₂O₄之间存在很强的界面相互作用，这有助于电荷转移和光生载流子的分离.光致发光光谱、电阻抗和光电流测试也证明了MoO₃/Bi₂O₄复合光催化剂的光生载流子分离效率更高，形成了更强的光电流.通过在可见光下降解RhB溶液评价了所合成光催化剂的光催化性能.15% MoO₃/Bi₂O₄（15-MB）复合光催化剂表现出了最佳的可见光催化活性，在40 min内对10 mg/L RhB溶液的降解率达到了99.6%，其降解速率是Bi₂O₄的2倍.此外，15-MB复合光催化剂在经过五次循环降解RhB溶液后仍保持良好的光催化活性和稳定性，表明MoO₃/Bi₂O₄复合光催化剂具有较强的应用潜力.通过自由基捕获实验确定了光催化反应中主要的活性自由基为·O₂^-和h⁺.通过莫特-肖特基测试和带隙计算得到MoO₃和Bi₂O₄的价带和导带位置.最后，根据实验和分析结果提出了Z型MoO₃/Bi₂O₄复合光催化剂在可见光下降解RhB溶液的机理.本研究为设计铋基Z型异质结光催化剂用于高效去除环境污染物提供了一种有前景的策略.

关键词: 氧化钼, 四氧化二铋, Z型, 异质结, 可见光, 降解

Abstract: Constructing Z-scheme heterojunction to improve the separation efficiency of photogenerated carriers of photocatalysts has gained extensive attention. In this work, we fabricated a novel Z-scheme MoO₃/Bi₂O₄ heterojunction photocatalyst by a hydrothermal method. XPS analysis results indicated that strong interaction between MoO₃ and Bi₂O₄ is generated, which contributes to charge transfer and separation of the photogenerated carriers. This was confirmed by photoluminescence (PL) and electrochemical impedance spectroscopy (EIS) tests. The photocatalytic performance of the as-synthesized photocatalysts was evaluated by degrading rhodamine B (RhB) in aqueous solution under visible light irradiation, showing that 15% MoO₃/Bi₂O₄ (15-MB) composite exhibited the highest photocatalytic activity, which is 2 times higher than that of Bi₂O₄. Besides, the heterojunction photocatalyst can keep good photocatalytic activity and stability after five recycles. Trapping experiments demonstrated that the dominant active radicals in photocatalytic reactions are superoxide radical (·O₂^-) and holes (h⁺), indicating that the 15-MB composite is a Z-scheme photocatalyst. Finally, the mechanism of the Z-scheme MoO₃/Bi₂O₄ composite for photo-degrading RhB in aqueous solution is proposed. This work provides a promising strategy for designing Bi-based Z-scheme heterojunction photocatalysts for highly efficient removal of environmental pollutants.

Key words: MoO_3, Bi₂O_4, Z-scheme, Heterojunction, Visible-light, Degradation

江天贵, 王楷, 郭婷, 吴晓勇, 张高科. 增强可见光催化活性的Z型MoO₃/Bi₂O₄复合光催化剂的制备[J]. 催化学报, 2020, 41(1): 161-169.

Tiangui Jiang, Kai Wang, Ting Guo, Xiaoyong Wu, Gaoke Zhang. Fabrication of Z-scheme MoO₃/Bi₂O₄ heterojunction photocatalyst with enhanced photocatalytic performance under visible light irradiation[J]. Chinese Journal of Catalysis, 2020, 41(1): 161-169.

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增强可见光催化活性的Z型MoO₃/Bi₂O₄复合光催化剂的制备

Fabrication of Z-scheme MoO₃/Bi₂O₄ heterojunction photocatalyst with enhanced photocatalytic performance under visible light irradiation

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