期刊
CARBON
卷 184, 期 -, 页码 102-108出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.08.013
关键词
Carbon dots; Reactive oxygen species; Sonocatalytic mechanism; Oxygen free radicals
资金
- Specialized Research Fund for Sanjin Scholars Program of Shanxi Province
- Program for the Innovative Talents of Higher Education Institutions of Shanxi
- Key Research and Development Plan (International Cooperation) of Shanxi Province [201903D421082]
- Transformation of Scientific and Technological Achievements Programs of Higher Education Institutions in Shanxi (TSTAP)
This study reveals a new mechanism in which cavitation of ultrasound can break oxygen-containing groups on carbon dots to generate ROS, leading to a higher sonocatalytic activity. Furthermore, the sonosensitizer function of carbon dots can be tuned by pH values, offering new possibilities for design and application in various fields.
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 (center dot 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. (C) 2021 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据