Wu Meixuan, Xu Yingying, He Qingshen, Sun Pengfei, Weng Xiaole, Dong Xiaoping
Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou 310018, China.
Zhejiang University, Hangzhou Global Scientific and Technological Innovation Center, Hangzhou 311200, China.
J Colloid Interface Sci. 2022 Sep 15;622:602-611. doi: 10.1016/j.jcis.2022.04.132. Epub 2022 Apr 29.
Recently, tribocatalysis driven by mechanical energy has been developed by rubbing two kinds of different materials. In this work, we firstly demonstrated that the friction of the single material also could initiate the tribocatalysis for degrading organic dyes. Under magnetic stirring, the multi-size granular polytetrafluoroethylene (PTFE) particles were triboelectrically charged, among which the collision between large and small particles would cause high energy electrons on large particles to transfer to small ones. These triboelectric charges on PTFE particles could react with adsorbed oxygen molecules or water to generate reactive oxygen species, and then promoted the degradation process of organic dyes together with oxidant holes. We further investigated the experimental parameters, such as stirring speed, size and quantity of stirring bar, to optimize the tribocatalytic performance. What's more, the PTFE tribocatalysis possessed high durability for multiple recycling runs with > 90% degradation efficiency of Rhodamine B, as well as well universality for eliminating other pollutants. Finally, we proposed a plausible tribocatalytic mechanism of multi-size granular PTFE according to the detected reactive oxygen species and the determined intermediates. This study provides new insights into tribocatalysis, and demonstrates that the single material with different particle sizes can also be used as catalyst to drive tribocatalytic process.
最近，通过摩擦两种不同材料开发了由机械能驱动的摩擦催化。在这项工作中，我们首先证明了单一材料的摩擦也可以引发用于降解有机染料的摩擦催化。在磁力搅拌下，多尺寸的聚四氟乙烯（PTFE）颗粒产生摩擦电荷，其中大颗粒和小颗粒之间的碰撞会导致大颗粒上的高能电子转移到小颗粒上。PTFE颗粒上的这些摩擦电荷可以与吸附的氧分子或水反应生成活性氧物种，然后与氧化空穴一起促进有机染料的降解过程。我们进一步研究了诸如搅拌速度、搅拌棒的尺寸和数量等实验参数，以优化摩擦催化性能。此外，PTFE摩擦催化在多次循环运行中具有高耐久性，罗丹明B的降解效率>90%，并且在消除其他污染物方面具有良好的通用性。最后，根据检测到的活性氧物种和确定的中间体，我们提出了一种合理的多尺寸颗粒PTFE的摩擦催化机制。这项研究为摩擦催化提供了新的见解，并证明了具有不同粒径的单一材料也可以用作催化剂来驱动摩擦催化过程。
