Variation of iodine-formation rate with airflow ratea and photon fluxb. a0.020 g catalyst loading, 0.050 M KI solution (25 mL), 365 nm, 25.2 μEinstein L-1 s-1; b0.020 g catalyst loading, 0.050 M KI solution (25 mL), 7.8 mL s-1 airflow, 22.4 mg L-1 dissolved O2, 365 nm.