ZIF-8 modified by isocyanate as a photocatalytic antibacterial agent  

作　　者：Yi-Ning Zhang Zhen Pei Zi-Hao Wang Chong-En Wang Fen-Fen Liang Li-Qiao Wei 

机构地区：[1]College of Architecture,Taiyuan University of Technology,Taiyuan 030024,China [2]Key Laboratory of Interface Science and Engineering in Advanced Materials of Taiyuan University of Technology,Ministry of Education,Taiyuan 030024,China [3]Department of Materials Science and Engineering,Shanxi Institute of Technology,Yangquan 045000,China [4]Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,Taiyuan 030000,China

出　　处：《Rare Metals》2024年第6期2708-2718,共11页稀有金属（英文版）

基　　金：financially supported by the Projects of the Research and Development Project of New Materials and Chemical Engineering Research Institute of Shanxi Zhejiang University(No.2021SX-AT010);the National Natural Science Foundation of China(No.21972103);Innovation and entrepreneurship training program for college students(No.202110112012)。

摘　　要：Zeolite imidazole skeleton(ZIF-8)is a promising option for self-cleaning of building exterior walls due to its large specific surface area,high antibacterial activity and low biotoxicity.However,it suffers from low antibacterial efficiency and yield under visible light irradiation.To address the issues,we developed the photocatalytic materials T-ZIF-8-TDI(thermally treated-ZIF-8-toluene 2,4-diisocyanate)by modifying ZIF-8 with thermal oxygen sensitization and chemical bonding.The results show that the yield of T-ZIF-8-TDI photocatalytic antibacterial agent is increased to 11.5 times of that of T-ZIF-8,while maintaining the crystal structure of T-ZIF-8 and thermal stability up to 60℃.Furthermore,T-ZIF-8-TDI exhibits extended optical response range to the nearinfrared region,significantly narrowed band gap,improved photogenerated elec tron-hole separation efficiency,reduced recombination rate,and excellent photocatalytic performance.When the concentration of antibacterial agent is 600 mg·L^(-1),the antibacterial rate of Escherichia coli(E.coli)reaches 99.99%irradiated by visible light for30 min,and when the concentration of antibacterial agent is 200 mg·L^(-1),the antibacterial rate of Staphylococcus aureus(S.aureus)reaches 99.99%irradiated by visible light for 25 min.We also analyzed the reasons in detail from the aspects of bacterial species and antibacterial mechanism,and proposed the antibacterial mechanism of·O_(2)^(-)and h^(+)as the main active species.These findings suggest that T-ZIF-8-TDI photocatalytic antibacterial agent has potential for use in self-cleaning of building exterior walls.

关 键 词：ZIF-8 Hot oxygen sensitization Modified by isocyanate Antimicrobial performance Photocatalytic antibacterial mechanism 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]