Abstract

To maximize the photocatalytic performance of practical energy devices, F-doped TiO₂ particles are anchored on g-C₃N₄ nanosheets through the liquid phase deposition (LPD) and calcination process. The photocatalytic activity of F-doped TiO₂/g-C₃N₄ (T-CN) composite is evaluated by the degradation of Rhodamine B (RhB) solution under visible-light illumination. The T-CN-300 sample (contain 300 mg g-C₃N₄) degrades 97% RhB after its illumination for 20 min. The quantum yield of the T-CN-300 sample is about three times higher than that of the pristine F-TiO₂ and g-C₃N₄ samples. Moreover, the trapping experiments of the T-CN-300 sample indicate that the superoxide radical (·O₂⁻) is the main active species upon the photocatalytic process. The spin-trapping experiments confirm that the T-CN-300 sample can produce more·O₂⁻ species than the other samples. The reduced interfacial charge transfer resistance of the T-CN-300 sample significantly enhances the photocurrent. The results reveal that the unique heterojunction of F-TiO₂ and g-C₃N₄ can effectively separate the photogenerated electron–hole pairs, accelerate the photocatalytic reaction, and increase the ·O₂⁻ species in the photodegradation system.

中文翻译：

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掺F的TiO 2 / gC 3 N 4异质结的简便设计以增强可见光的光催化活性

摘要

为了使实际能量装置的光催化性能最大化，通过液相沉积（LPD）和煅烧工艺将F掺杂的TiO ₂颗粒锚固在gC ₃ N ₄纳米片上。F-掺杂的TiO ₂ / gC ₃ N ₄（T-CN）复合材料的光催化活性通过在可见光照射下若丹明B（RhB）溶液的降解来评估。照明20分钟后，T-CN-300样品（包含300 mg gC ₃ N ₄）降解97％的RhB。T-CN-300样品的量子产率约为原始F-TiO ₂和gC ₃ N ₄的量子产率的三倍。样品。此外，T-CN-300样品的捕获实验表明，超氧自由基（·O2 ₂ ^- ）是在所述光催化过程中的主要活性物质。自旋捕集实验确认T-CN-300样品能产生更多·O2 ₂ ^-物种比其它样品。T-CN-300样品降低的界面电荷转移电阻会显着增强光电流。结果表明，F-TiO 2的异质结独特₂和GC ₃ Ñ ₄可以有效地分离光生电子-空穴对，加速光催化反应，并增加·O2 ₂ ^-种在光降解系统。