Applied Surface Science ( IF 6.3 ) Pub Date : 2023-02-24 , DOI: 10.1016/j.apsusc.2023.156848
Jie Zhang , Jiasheng Li , Quanxi Zhang , Donggang Guo
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Constructing a Z-scheme photocatalytic system offers great advantages for boosting photocatalytic performance due to its effective charge carrier transfer and strong redox capability. Herein, Cu2S/CuS nanosheets heterojunction were prepared by a facile one-pot solvothermal method. CuS/Cu2S Z-scheme heterojunction realized rapid bacteria-killing under near-infrared (NIR) irradiation. The optimized CuS/Cu2S (CuS/Cu2S-1) achieved 99 % antibacterial efficiency against Escherichia coli (E. coli) within 10 min NIR irradiation. Owing to the optimization of CuS/Cu2S-1 Z-scheme heterojunction, the efficient interfacial charge separation was realized, thereby resulting in a high yield of reactive oxygen species. Moreover, the heterojunction exhibited locally a higher temperature under NIR irradiation, favorable for eradicating bacteria. In addition, radical scavenging tests and ESR spectra results showed that ⋅O2–, ⋅OH and 1O2 were main active species responsible for sterilization. Under the synergy of photocatalytic and photothermal effects, the membrane structure of bacteria was severely damaged in CuS/Cu2S-1 system. This study not only offers a reliable approach for photothermocatalytic inactivation, but also affords the bases for the development of Z-scheme heterojunction aimed at designing highly efficient photocatalysts.
中文翻译:

构建新型 CuS/Cu2S Z 型异质结以实现高效 NIR 光驱动抗菌活性
由于其有效的载流子转移和强大的氧化还原能力,构建 Z 型光催化体系为提高光催化性能提供了巨大的优势。在此,通过简便的一锅溶剂热法制备了Cu 2 S/CuS 纳米片异质结。CuS/Cu 2 S Z型异质结实现了近红外(NIR)照射下的快速杀菌。优化后的 CuS/Cu 2 S (CuS/Cu 2 S-1)在近红外辐射 10 分钟内对大肠杆菌( E. coli ) 的抗菌效率达到 99%。由于 CuS/Cu 2的优化S-1 Z型异质结,实现了高效的界面电荷分离,从而获得高产率的活性氧。此外,异质结在 NIR 照射下局部表现出更高的温度,有利于根除细菌。此外,自由基清除试验和ESR光谱结果表明,⋅O 2 –、⋅OH和1 O 2是负责杀菌的主要活性物质。在光催化和光热效应的协同作用下,细菌膜结构在CuS/Cu 2中严重受损S-1系统。该研究不仅为光热催化失活提供了可靠的方法,而且为开发旨在设计高效光催化剂的 Z 型异质结提供了基础。