fig9

From: Tribocatalysis: evolution toward efficient heterogeneous catalysis in aqueous solutions

Figure 9. UV-Vis absorption spectra and color changes of 300 mg/L RhB solutions containing TiO₂ nanoparticles during magnetic stirring in beakers with (A) a glass bottom, (B) an Al₂O₃ coating, (C) a PTFE coating, and (D) a Ti coating; (E) C/C₀ as a function of magnetic stirring time; (F) degradation efficiencies after 16 h of magnetic stirring. (A-F) are reprinted with permission from^[40]. Adhering to the CC BY 4.0 agreement. PTFE: Polytetrafluoroethylene; UV-Vis: ultraviolet-visible.