Fig. 2: Degrading methyl orange (MO) aqueous solution by contact-electro-catalysis (CEC)-yield reactive oxygen species (ROS). | Nature Communications

Fig. 2: Degrading methyl orange (MO) aqueous solution by contact-electro-catalysis (CEC)-yield reactive oxygen species (ROS).

From: A contact-electro-catalysis process for producing reactive oxygen species by ball milling of triboelectric materials

Fig. 2

Optical and thermographic images of polytetrafluoroethylene (PTFE) vials and balls (a) before reaction, as well as (b) after the reaction. c UV-Vis spectra of a 5-ppm MO aqueous solution when PTFE vial and balls were employed for ball milling. d Liquid chromatograph of the aqueous MO solution at different degradation time intervals with peaks being identified by mass spectra. e Evolution of relative concentration of MO under various radical scavengers with the same final concentration of 1 mM. The relative concentration is calculated based on the absorbance of MO that measured by UV-Vis spectroscopy. f Size distribution of PTFE milling balls before and after grinding. g Performance comparison on MO decolorization in presence of different pristine polymers, including PTFE, polydimethylsiloxane (PDMS) and polypropylene (PP). The relative concentration is calculated based on the absorbance of MO that measured by UV-Vis spectroscopy. h Proposed working principle of CEC during ball milling using triboelectric materials. The gray circle represents for milling balls made of triboelectric materials, pink circle for O atoms, purple circle for H atoms, and yellow circle for electrons. Error bars represent standard deviation based on three replicate data. Source data are provided as a Source Data file. Created with Procreate and Adobe Illustrator.

Back to article page