Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2021-06-24 , DOI: 10.1016/j.jhazmat.2021.126462 Ze Zhang 1 , Jingyu Sun 1 , Xue Chen 1 , Guizhu Wu 1 , Zhengguo Jin 1 , Donggang Guo 2 , Lu Liu 1
The rational design of high antibacterial efficiency are urgently needed as the occurrence of drug-resistance issues. Hence, Ni/reduced graphene oxide nanocomposite (Ni/rGO) with different amounts of oxygen vacancies were fabricated for efficient disinfection. The optimized Ni/rGO (A100) exhibited highly effective inactivation efficacy of 99.6% and 99.5% against Escherichia coli and Bacillus subtilis within 8 min near-infrared (NIR) irradiation through the synergistic effects of photothermal therapy and oxidative damage, which were much higher than single treatment. The A100 nanocomposite achieved an extraordinary photothermal conversion efficiency (35.78%) under the 808 nm irradiation for enhanced photothermal hyperthermia, thereby destroying the cell membrane and accelerating the GSH depletion. The radical scavenger experiment confirmed that •O2- and •OH play the chief role in photodisinfection reaction. Besides, A100 could exert significant damage on the ATP synthesis. The excellent photothermal performance and photocatalytic activity can be attributed to the appropriate oxygen vacancy density, which improves the absorption of NIR light and facilitates the separation of photogenerated electron-hole pairs. Besides, the higher NiO content of A100 contributed to improving the photocatalytic effect. Our work demonstrated a promising strategy for efficient water pollution purification caused by pathogenic bacteria.
中文翻译:
缺氧Ni/还原氧化石墨烯纳米复合材料增强光催化活性和光热效应的协同作用在近红外辐射下快速消毒
随着耐药性问题的出现,迫切需要合理设计高抗菌效率。因此,制备了具有不同氧空位量的 Ni/还原氧化石墨烯纳米复合材料 (Ni/rGO) 以进行有效消毒。优化后的 Ni/rGO (A100) 对大肠杆菌和枯草芽孢杆菌的灭活效率分别为 99.6% 和 99.5%8 分钟内近红外 (NIR) 照射通过光热疗法和氧化损伤的协同作用,远高于单一治疗。A100 纳米复合材料在 808 nm 照射下实现了非凡的光热转换效率(35.78%),以增强光热热疗,从而破坏细胞膜并加速 GSH 消耗。自由基清除剂实验证实,•O 2 -•OH 在光消毒反应中起主要作用。此外,A100 可能对 ATP 合成产生显着损害。优异的光热性能和光催化活性可归因于适当的氧空位密度,这提高了近红外光的吸收并促进了光生电子-空穴对的分离。此外,A100 中较高的 NiO 含量有助于提高光催化效果。我们的工作展示了一种有效净化由病原菌引起的水污染的有前景的策略。