Fig. 4: Catalytic generation of ROS at the air–water interface.
From: Harnessing air-water interface to generate interfacial ROS for ultrafast environmental remediation
a EPR spectra of the generated ROS in Co@SCN-PMS in the presence/absence of microbubbles; b Effect of microbubbles on the 7-hydroxycoumarin production in the Co@SCN-PMS system; c Effect of different scavengers on the 7-hydroxycoumarin production in the Co@SCN-PMS-Microbubble system; d Brightfield and fluorescence images of a microbubble during different reaction time in the Co@SCN-PMS-Microbubble system; e XPS spectrum of Co@SCN before and after interface/bulk reactions for Co 2p; f Schematic illustration of the catalytic generation of SO4•− at the interface and in the solution bulk, and their respective concentrations (Error bars represent the standard deviation of 2 independent measurements). Conditions: [Co@SCN] = 0.01 g L−1, [PMS] = 0.1 g L−1, [DMPO] = 100 μM, [Coumarin] = 1.0 mM for b = 20 μM for d, [EtOH] = [TBA] = [TEMP] = 10 mM, pH = 5.6. Scale bar for d: 300 μm.
