Mn掺杂协同异质界面调控Sn3O4/g-C3N4光催化降解机制与性能
Study on the mechanism and properties of the photocatalytic degradation of Sn3O4/g-C3N4 regulated by Mn doping with a synergistic heterogeneous interface
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摘要: 工业快速发展导致大量有机染料排放到水体中,对生态环境和人类健康造成严重威胁。为了消除水体中难降解的污染物,开发能耗低、效率高、长期稳定的光催化剂成为了降解技术应用中的关键问题。本文采用煅烧-水热协同法,在g-C3N4纳米片表面原位生长Mn掺杂Sn3O4纳米结构,成功构建了II型Mn-Sn3O4/g-C3N4异质结光催化剂,用于光降解罗丹明B染料。改变Mn-Sn3O4的用量,获得了不同的Mn-Sn3O4-x/g-C3N4的负载量。使用一系列表征设备对材料进行表征,结果表明,催化剂成功制备,带隙也得到了改善。并通过降解一定浓度的罗丹明B溶液,研究了催化剂的光催化降解效果。在光照40 min后,Mn-Sn3O4-10/g-C3N4对罗丹明B的降解率达到82.5%,显著高于g-C3N4,证实II型异质结与Mn掺杂的协同作用。本研究合理设计了具有优异稳定性、良好降解效果的Mn-Sn3O4-x/g-C3N4复合催化剂,为g-C3N4基复合催化剂的研究与开发提供了有益的指导。Abstract: The rapid development of industry has led to substantial discharge of organic dyes into aquatic systems, posing severe threats to ecological environments and human health. To address persistent water pollutants, developing photocatalysts with low energy consumption, high efficiency, and long-term stability has become a critical challenge in degradation technology applications. In this study, a calcination-hydrothermal synergistic approach was employed to in situ grow Mn-doped Sn3O4 nanostructures on g-C3N4 nanosheets, successfully constructing a II-type Mn-Sn3O4/g-C3N4 heterojunction photocatalyst for rhodamine B (RhB) photodegradation. By varying the Mn-Sn3O4 loading content, a series of Mn-Sn3O4-x/g-C3N4 composites with different compositions were obtained. Comprehensive characterization confirmed the successful fabrication of the catalysts and bandgap optimization. Photocatalytic evaluation through RhB degradation demonstrated that the Mn-Sn3O4-10/g-C3N4 composite achieved 82.5% degradation efficiency within 40 min under illumination, significantly outperforming pristine g-C3N4. This enhancement verifies the synergistic effect between II-type heterojunction formation and Mn doping. The rationally designed Mn-Sn3O4-x/g-C3N4 composite exhibits outstanding stability and degradation performance, providing valuable guidance for developing advanced g-C3N4-based photocatalysts.
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