首页|ZIF-8 modified by isocyanate as a photocatalytic antibacterial agent
ZIF-8 modified by isocyanate as a photocatalytic antibacterial agent
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Zeolite imidazole skeleton(ZIF-8)is a promising option for self-cleaning of building exterior walls due to its large specific surface area,high antibac-terial activity and low biotoxicity.However,it suffers from low antibacterial efficiency and yield under visible light irradiation.To address the issues,we developed the pho-tocatalytic 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 near-infrared region,significantly narrowed band gap,improved photogenerated electron-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 for 30 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·O2-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.
ZIF-8Hot oxygen sensitizationModified by isocyanateAntimicrobial performancePhotocatalytic antibacterial mechanism
College of Architecture,Taiyuan University of Technology,Taiyuan 030024,China
Key Laboratory of Interface Science and Engineering in Advanced Materials of Taiyuan University of Technology,Ministry of Education,Taiyuan 030024,China
Department of Materials Science and Engineering,Shanxi Institute of Technology,Yangquan 045000,China
Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,Taiyuan 030000,China
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Projects of the Research and Development Project of New Materials and Chemical Engineering Research Institute of Shanxi Zhej国家自然科学基金Innovation and Entrepreneurship Training Program for College Students
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