Tribocatalytic activation of peroxymonosulfate by TiO 2 nanoparticles for powerful degradation of organic pollutants

作者：Zeren Zhou, Ruijia Chen, Hanze Zhu, Yongming Hu, Najun Li, Wanping Chen · 发表于：Journal of Advanced Ceramics · 年份：2025 · DOI：10.26599/jac.2025.9221237 · 被引用次数：3 · 研究领域：Advanced oxidation water treatment、Industrial Gas Emission Control、Water Quality Monitoring and Analysis

Sulfate radical (SO₄•⁻) based advanced oxidation processes have received increasing interest for the treatment of organic wastewater and various methods are being intensively investigated to activate peroxydisulfate (PDS) or peroxymonosulfate (PMS) to generate SO₄•⁻. Presently, we have explored the activation of PMS via tribocatalysis for the first time. In glass beakers with PTFE disks coated on bottoms, solutions of organic pollutants suspended with TiO 2 nanoparticles were subjected to magnetic stirring to realize tribocatalytic degradation. To our great surprise, the addition of 200 mg/L PMS was found to greatly enhance the tribocatalytic degradation of 50 mg/L rhodamine B (RhB), methylene blue (MB), and methyl orange (MO) solutions, and 20 mg/L bisphenol A (BPA) and phenol solutions, which were all degraded  rather thoroughly in quite short periods of time and their total organic carbon removals all were substantially improved. Electron paramagnetic resonance spectroscopy analyses showed that the addition of PMS not only leads to the formation of SO₄•⁻ but also dramatically increased the amount of •OH, O₂•⁻ and ¹O₂ when TiO 2 nanoparticles were stimulated through magnetic stirring. It is proposed that electron-hole pairs are excited in TiO 2 nanoparticles by mechanical energy absorbed through friction, which react with PMS to generate SO₄•⁻ and other radicals. These findings demonstrate an energy-efficient paradigm for PMS activation and many more studies on trib...