An S-scheme TiO2/g-C3N4 nanocomposite effectively degrades phenanthrene under visible light

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2024-10-14 DOI:10.1016/j.colsurfa.2024.135554

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Abstract

It is a challenge to effectively degrade phenanthrene (PHE) pollutants, which are widely present in aquatic environments, in order to reduce harm to humans and ecosystems. In this study, an S-scheme TiO₂/g-C₃N₄ photocatalytic system is constructed using 0D TiO₂ nanospheres and 2D g-C₃N₄ nanosheets for the removal of PHE from water under sunlight irradiation. The effects of irradiation time, quality ratio of TiO₂ to g-C₃N₄, and cycle time on the performance of the TiO₂/CN photocatalyst are investigated. The experimental results show that the ratio of TiO₂ to g-C₃N₄ significantly affects the photocatalytic activity of the photocatalyst. Under the optimal ratio of TiO₂ to g-C₃N₄ (50 % TiO₂/CN), the apparent reaction rate constant for phenanthrene reached 0.00796 min⁻¹, which is 11.5 times higher than that of pure TiO₂ (0.00069 min⁻¹). The tests of optical performance and photoelectrochemical properties further confirmed that the construction of the TiO₂/g-C₃N₄ S-type photocatalyst successfully enhanced the spatial separation efficiency of photogenerated carriers and ensured a continuous supply of energy during the redox reaction process. Converting highly toxic phenanthrene into a non-toxic green degradation product provides an practical strategy for the safe treatment of PHE in aqueous environments through the use of visible-light-driven heterojunction photocatalysts. Additionally, the data collected on phenanthrene degradation in this study will provide valuable references for developing degradation methods for other PAHs, such as naphthalene, anthracene, and pyrene.

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S 型 TiO2/g-C3N4 纳米复合材料在可见光下有效降解菲

如何有效降解广泛存在于水环境中的菲类（PHE）污染物，以减少对人类和生态系统的危害，是一项挑战。本研究利用 0D TiO2 纳米球和 2D g-C3N4 纳米片构建了一个 S 型 TiO2/g-C3N4 光催化系统，用于在阳光照射下去除水中的 PHE。研究了辐照时间、TiO2 与 g-C3N4 的质量比以及循环时间对 TiO2/CN 光催化剂性能的影响。实验结果表明，TiO2 与 g-C3N4 的质量比会显著影响光催化剂的光催化活性。在 TiO2 与 g-C3N4 的最佳比例（50% TiO2/CN）下，菲的表观反应速率常数达到 0.00796 min-1，是纯 TiO2（0.00069 min-1）的 11.5 倍。光学性能和光电化学性质测试进一步证实，TiO2/g-C3N4 S 型光催化剂的构建成功提高了光生载流子的空间分离效率，确保了氧化还原反应过程中能量的持续供应。通过使用可见光驱动的异质结光催化剂，将剧毒菲转化为无毒的绿色降解产物，为安全处理水环境中的 PHE 提供了一种实用策略。此外，本研究收集的菲降解数据将为开发萘、蒽和芘等其他多环芳烃的降解方法提供有价值的参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.