Kinetics and Modeling of the Removal of Nitric Oxide by Aqueous Sodium Persulfate Simultaneously Activated by Temperature and Fe²⁺

The chemistry and kinetics of NO removal by aqueous solutions of sodium persulfate (Na 2 S 2 O 8 ) simultaneously activated by temperature and Fe 2+ were studied in a bubble reactor. Reaction pathways were proposed and a mathematical model utilizing the pseudo-steady-state-approximation technique and film theory of mass transfer were developed. The model was solved numerically using the fourth order Runge–Kutta method in Matlab to obtain species concentrations; correlate experimental data; and estimate mass transfer and kinetic rate parameters. The model was used to investigate the effects of Na 2 S 2 O 8 (0.01–0.2 M), Fe 2+ (0–0.1 M), gas-phase NO (500–1000 ppm) concentrations and temperatures (23–90 °C), and is a follow-up to an experimental study, which demonstrated that Fe 2+ activation further improved NO conversion by ∼10% at all temperatures. The model results, which appeared to fit those of the experiments remarkably well, were discussed and predicted kinetic data compared with available literature values.