Facile in situ construction strategy to deposit Mn0.5Cd0.5S nanoparticles on TiO2 nanosheets for highly efficient visible light photocatalytic degradation of tetracycline

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2024-09-30 DOI:10.1039/d4cy00868e

Liezhen Zhu , Jing Liu , Youliang Shen , Lingfang Qiu , Xun Xu , Jiangbo Xi , Deliang Li , Ping Li , Shuwang Duo

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Abstract

Developing a highly efficient visible-light-driven TiO₂-based photocatalyst for the degradation of tetracycline remains challenging due to the high photogenerated electron/hole recombination rate and narrow visible light response range of TiO₂. To address these problems, novel heterojunctions are fabricated by coupling TiO₂ nanosheets with Mn_0.5Cd_0.5S nanoparticles as visible-light photocatalysts. The as-synthesized photocatalysts exhibit high photogenerated electron/hole separation efficiency and enhanced visible-light absorption due to the well-matched energy levels, leading to the highly efficient degradation of tetracycline under visible light irradiation and excellent recyclability. The degradation efficiency of the optimum MCS/TiO₂-II photocatalyst could reach 90% within 120 min, which was about 2.5 times and 6.9 times higher than those of MCS and TiO₂, respectively. Furthermore, the degradation mechanism of tetracycline was revealed in depth based on the trapping experiments, XPS, photoelectrochemical characterizations, and DFT calculations. Therefore, this work provides an effective approach to explore excellent photocatalysts to realize the highly efficient removal of refractory tetracycline under visible light.

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在 TiO2 纳米片上沉积 Mn0.5Cd0.5S 纳米粒子的简便原位构建策略，用于高效可见光光催化降解四环素

由于二氧化钛的光生电子/空穴重组率高和可见光响应范围窄，开发一种高效的可见光驱动的二氧化钛基光催化剂来降解四环素仍然具有挑战性。为了解决这些问题，研究人员通过将 TiO2 纳米片与 Mn0.5Cd0.5S 纳米颗粒耦合，制备出新型异质结，作为可见光光催化剂。由于能级匹配良好，所合成的光催化剂表现出较高的光生电子/空穴分离效率和较强的可见光吸收能力，从而在可见光照射下高效降解四环素，并具有良好的可回收性。最佳 MCS/TiO2-II 光催化剂在 120 分钟内的降解效率可达 90%，分别是 MCS 和 TiO2 的 2.5 倍和 6.9 倍。此外，基于捕集实验、XPS、光电化学表征和 DFT 计算，深入揭示了四环素的降解机理。因此，这项工作为探索在可见光下实现高效去除难降解四环素的优异光催化剂提供了有效途径。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.