A Z-scheme heterojunction of ZnO/CDots/C3N4 for strengthened photoresponsive bacteria-killing and acceleration of wound healing
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第22期
论文作者：Yiming Xiang Qilin Zhou Zhaoyang Li Zhenduo Cui Xiangmei Liu Yanqin Liang Shengli Zhu Yufeng Zheng Kelvin Wai Kwok Yeung Shuilin Wu
摘 要：The abuse of antibiotics is leading to the emergence of resistant bacteria. In this work, a drug-free composite of ZnO/CDots/g-C3N4 with Z-scheme heterojunction was developed, which was employed to kill bacteria effectively within a very short time under the irradiation of visible light due to the enhanced photocatalytic and photothermal effects. In this system, the CDots acted as a bridge between g-C3N4 and ZnO, effectively inhibiting the recombination of photo-generated electrons with holes and consequently enhancing the photocatalytic properties. In addition, CDots endowed the system with excellent photothermal effects. As a result, the antibacterial efficacy of ZnO/CDots/g-C3N4 composite against S. aureus and E. coli reached up to 99.97 % and 99.99 % respectively, after 15 min of visible light irradiation, due to the synergistic action of photo-inspired radical oxygen species and hyperthermia. The Zn ions released from the composite promoted the growth of fibroblasts, which accelerated the wound healing process.
Yiming Xiang1,2,3，Qilin Zhou1，Zhaoyang Li2，Zhenduo Cui2，Xiangmei Liu1，Yanqin Liang2，Shengli Zhu2，Yufeng Zheng4，Kelvin Wai Kwok Yeung3，Shuilin Wu1,2
1. Hubei Key Laboratory of Polymer Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials,School of Materials Science & Engineering, Hubei University2. The Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China, School of Materials Science & Engineering,Tianjin University3. Department of Orthopaedics & Traumatology, Li Ka Shing Faculty of Medicine, The University of Hong Kong4. State Key Laboratory for Turbulence and Complex System and Department of Materials Science and Engineering, College of Engineering, Peking University
摘 要：The abuse of antibiotics is leading to the emergence of resistant bacteria. In this work, a drug-free composite of ZnO/CDots/g-C3N4 with Z-scheme heterojunction was developed, which was employed to kill bacteria effectively within a very short time under the irradiation of visible light due to the enhanced photocatalytic and photothermal effects. In this system, the CDots acted as a bridge between g-C3N4 and ZnO, effectively inhibiting the recombination of photo-generated electrons with holes and consequently enhancing the photocatalytic properties. In addition, CDots endowed the system with excellent photothermal effects. As a result, the antibacterial efficacy of ZnO/CDots/g-C3N4 composite against S. aureus and E. coli reached up to 99.97 % and 99.99 % respectively, after 15 min of visible light irradiation, due to the synergistic action of photo-inspired radical oxygen species and hyperthermia. The Zn ions released from the composite promoted the growth of fibroblasts, which accelerated the wound healing process.
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