Fig. 4: Potential mechanism of kinetics enhancement under spatial nanoconfinement.
From: Water decontamination via nonradical process by nanoconfined Fenton-like catalysts
a EIS (Electrochemical impedance spectroscopy) Nyquist plots of CNTs, Co3O4-out-CNT and Co3O4-in-CNT. b The mass transfer process of species in heterogeneous Fenton system, and the relationship between mass transfer distance with reaction rate. c, d Variation of PAA, BPA concentrations in bulk solution and on catalyst surface, respectively (circles represent data points, solid lines represent the simulated change of species concentration in bulk solution, and dashed lines represent the simulated change of species concentration on catalyst surface). e, f Relationship between ROS concentration and migration-diffusion distance in the Co3O4-in-CNT/PAA and Co3O4-out-CNT/PAA system, respectively. g, h Two-dimensional illustration of ROS exposure as a function of BPA concentration and distance from the catalyst surface.
