Mingzhang Zhu

Tribocatalysis has become an efficient and low‐consumption technology for degrading high‐concentration organic dyes, which is different from photocatalysis and other traditional catalytic technologies. This study utilized copper oxide (CuO) nanoparticles to effectively degrade Rhodamine B (RhB) solutions at high concentrations through magnetic stirring. Using a PTFE magnetic rotating disk, CuO nanoparticles exhibited remarkable tribocatalytic degradation of RhB solutions. 99.9% of 100 mg/L RhB in 2 h, 99.2% of 200 mg/L RhB in 4 h, and 99.4% of 300 mg/L RhB in 7 h, all conducted in glass‐bottomed beakers. Electron paramagnetic resonance (EPR) analysis further verified that different catalytic approaches significantly influence the ability of CuO nanoparticles to generate reactive oxygen species (•OH and •O ₂ ). These findings indicate that, compared with photocatalysis, frictional catalysis has significant advantages in the degradation of high‐concentration organic dyes.

Coating disk-shaped materials on the bottoms of containers has become a highly effective method for tribocatalysis enhancement. Here, the effects of Ti coatings on the tribocatalytic degradation of organic dyes by CdS nanoparticles were systematically studied. For both 50 mg/L rhodamine B (RhB) and 20 mg/L methyl orange (MO) solutions, the tribocatalytic degradation by CdS nanoparticles was dramatically enhanced in Ti-coated beakers compared to as-received glass-bottomed beakers, with the degradation rate constant increased by 4.77 and 5.21 times, respectively. Moreover, for tribocatalytic degradation of MO using CdS, two quite different MO degradation modes were identified between Ti and Al₂O₃ coatings. Electron paramagnetic resonance (EPR) spectroscopy analyses showed that more radicals were generated when CdS nanoparticles rubbed against the Ti coating than against the glass bottom, and boron nitride nanoparticles were employed to verify that the enhancement associated with the Ti coating resulted from the interactions between Ti and CdS. These findings underscore the importance of catalyst and coating material selection in tribocatalytic systems, offering valuable insights for the development of efficient environmental purification technologies.

Coating disk-shaped materials on the bottoms of containers has become a highly effective method for tribocatalysis enhancement. Presently, the effects of Ti coatings on the tribocatalytic degradation of organic dyes by CdS nanoparticles have been systematically studied. For both 50 mg/L rhodamine B (RhB) and 20 mg/L methyl orange (MO) solutions, the tribocatalytic degradation by CdS nanoparticles was dramatically enhanced in Ti-coated beakers than in as-received glass-bottomed beakers, with the degradation rate constant increased by 4.77 and 5.21 times, respectively. Moreover, for tribocatalytic degradation of MO using CdS, two quite different MO degradation modes have been identified between Ti and Al2O3 coatings. Electron paramagnetic resonance (EPR) spectroscopy analyses showed that more radicals were generated when CdS nanoparticles rubbed against Ti coating than glass bottom, and boron nitride nanoparticles had been employed to verify that the enhancement associated with Ti coatings resulted from the interactions between Ti and CdS. These findings underscore the importance of catalysts and coating materials selection in tribocatalytic systems, offering valuable insights for the development of efficient environmental purification technologies.