活性氧
氧气
激进的
光化学
化学
声动力疗法
催化作用
荧光
空化
材料科学
电子顺磁共振
超声波
过氧化氢
离子
碳纤维
有机化学
生物化学
核磁共振
声学
复合材料
物理
复合数
量子力学
机械
作者
Weijie Ren,Huiqi Wang,Qing Chang,Ning Li,Jinlong Yang,Shengliang Hu
出处
期刊:Carbon
[Elsevier BV]
日期:2021-10-01
卷期号:184: 102-108
被引量:16
标识
DOI:10.1016/j.carbon.2021.08.013
摘要
Although ultrasound-induced reactive oxygen species (ROS) have believed to be primary intermediates for the realization of sonodynamic therapy and sonocatalytic reactions, the mechanism of ROS production under ultrasound has not been well clarified till now. Here we discovered that ultrasound cavitation can break up oxygen-containing groups on the surface of carbon dots (CDs) to generate ROS, giving rise to a novel mechanism different from as-reported those. The bond cleavage of oxygen-containing groups contribute transient oxygen free radicals (•O−) that involve in the subsequent formation of ROS by quickly reacting with hydrogen ions and water, thereby leading to a twice higher sonocatalytic activity of CDs than TiO2. Moreover, the sonosensitizer function of CDs can be tuned by pH values of the surrounding environment that determine the generation and evolution reaction of oxygen free radicals under ultrasound irradiation. This finding paves a new way to design multifunctional sonosensitizers and utilize them in various fields.
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