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Sandwich-structured continuous ZIF-8/Ti3C2 MXene/ZIF-8 for efficient sterilization: Enhanced photocatalytic activity, photothermal effect, and environmental safety

•The sandwich-structured composite nanosheets with conformal and ultrathin ZIF-8 layers.•Improved photothermal conversion efficiency and photocurrent response, as well as photocatalytic sterilization efficiency.•The interfacial Zn–O–Ti bonding contact promoting electron transfer through the short-ra...

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Published in:Water research (Oxford) 2024-08, Vol.259, p.121888, Article 121888
Main Authors: Xiong, Furong, Hu, Huilin, Xue, Xiang, Wu, Minqi, Zhou, Jiajie, Zhang, Wang, Li, Rui
Format: Article
Language:English
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Summary:•The sandwich-structured composite nanosheets with conformal and ultrathin ZIF-8 layers.•Improved photothermal conversion efficiency and photocurrent response, as well as photocatalytic sterilization efficiency.•The interfacial Zn–O–Ti bonding contact promoting electron transfer through the short-range transport mechanism.•The ZIF-8/MXene/ZIF-8-300 film with excellent photocatalytic water disinfection performance. The development of effective water purification systems is crucial for controlling and remediating environmental pollution, especially in terms of sterilization. Herein, we demonstrate elaborately designed composite nanosheets with a sandwich structure, composed of two-dimensional (2D) Ti3C2 MXene nanosheet core and conformal ZIF-8 ultrathin outer layers, and their potential applications in photocatalytic sterilization. The study results indicate that the conformal ZIF-8-MXene nanosheet exhibits an expanded light absorption range (826 nm), improved photothermal conversion efficiency (6.2 °C s−1), and photocurrent response, thus boosting photocatalytic sterilization efficiency (6.63 log10 CFU mL−1) against Escherichia coli under simulated sunlight within 90 min. Interestingly, 2D ZIF-8 layers exhibit positive zeta potential (19 mV), good hydrophilicity (40.6°), and local photogenerated-hole accumulation, possessing efficient bacteria-trapping efficiency. Membrane filters fabricated from optimized composite nanosheets exhibit an outstanding bacteria-trapping and sterilization efficiency (almost 100 %) against Escherichia coli under simulated sunlight within 30 min of the flow photocatalytic experiments. This work not only presents a rational structural design of the conformal and ultrathin anchoring of ZIF-8 onto a 2D conductive material for bacteria-trapping and sterilization, but also opens new opportunities for using metal–organic frameworks in photocatalytic disinfection of drinking water. [Display omitted]
ISSN:0043-1354
1879-2448
1879-2448
DOI:10.1016/j.watres.2024.121888