Wu Meixuan, Zhang Yaning, Yi Yuyan, Zhou Baocheng, Sun Pengfei, Dong Xiaoping
School of Chemistry and Chemical Engineering, 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.
School of Chemistry and Chemical Engineering, 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.
J Hazard Mater. 2023 Oct 5;459:132147. doi: 10.1016/j.jhazmat.2023.132147. Epub 2023 Jul 24.
Recently, friction-induced tribocatalysis has received tremendous attention through converting mechanical energy to chemical energy. However, its efficiency is much lower than those of photocatalysis and piezocatalysis, and its environmental application is limited in dye degradation. Herein, we developed a facile approach to improve the tribocatalytic activity of BiWO via adding trace polymer powders to form friction pairs with BiWO. Among various polymers, PTFE was demonstrated to be the best counterpart of BiWO. Subsequently, the PTFE dosage, stirring rate, magnetic bar size and number, and stirring mode were further optimized. The PTFE-promoted BiWO tribocatalysis was verified to possess excellent performance not only for removing different dyes, but also for degrading chlorophenols that are typical persistent organic pollutants. Multiple uses of the recycled catalysts indicated its good stability and prominent tribocatalytic durability. EPR measurements suggested the generation of hydroxyl radical and superoxide radical, which were determined to be continuously generated within 12 h at the rates of 0.88 μM h and 85 μM h, respectively. Subsequently, a possible mechanism was proposed to explain the enhanced performance of the PTFE-promoted BiWO tribocatalysis. Finally, on basis of the detected intermediates, the degradation pathways of Rhodamine B and 2,4-Dichlorophenol during tribocatalysis were suggested.
最近，摩擦诱导的摩擦催化通过将机械能转化为化学能而受到了极大的关注。然而，其效率远低于光催化和压电催化，并且其在环境应用中的染料降解方面受到限制。在此，我们开发了一种简便的方法，通过添加微量聚合物粉末与BiWO形成摩擦副来提高BiWO的摩擦催化活性。在各种聚合物中，聚四氟乙烯（PTFE）被证明是BiWO的最佳配对物。随后，对PTFE用量、搅拌速率、磁棒尺寸和数量以及搅拌方式进行了进一步优化。PTFE促进的BiWO摩擦催化不仅被证实对去除不同染料具有优异的性能，而且对降解典型的持久性有机污染物氯酚也具有优异的性能。回收催化剂的多次使用表明其具有良好的稳定性和突出的摩擦催化耐久性。电子顺磁共振（EPR）测量表明产生了羟基自由基和超氧自由基，分别测定它们在12小时内以0.88 μM h和85 μM h的速率持续产生。随后，提出了一种可能的机制来解释PTFE促进的BiWO摩擦催化性能增强的原因。最后，基于检测到的中间体，提出了罗丹明B和2,4-二氯苯酚在摩擦催化过程中的降解途径。
