Exploring key reaction sites and deep degradation mechanism of perfluorooctane sulfonate via peroxymonosulfate activation under electrocoagulation process

Accelerated Fenton degradation of azo dye wastewater via a novel Z-scheme CoFeN-g-C3N4 heterojunction photocatalyst with excellent charge transfer under visible light irradiation

“…In general, the radical scavenger DMPO is used to capture ˙OH in aqueous solution and ˙O 2 − in methanol solution during photocatalysis. 45 It can be seen from the test results that the signal peaks of ˙O 2 − and ˙OH are hardly detected under dark conditions, and the typical signal peaks corresponding to the above two radicals appear after 5 min of illumination, which confirms that ˙O 2 − and ˙OH are produced during the photocatalytic reaction. The results of the EPR test were completely consistent with the results obtained from the radical trapping experiments.…”

Removal of Low Trace ppb-Level Perfluorooctanesulfonic Acid (PFOS) with ZIF-8 Coatings Involving Adsorbent Degradation

“…However, after PFOS adsorption, a continuous domain of flake-like structure clusters (surface debris), possibly coated over the crystals, was observed on the composite surface (Figure c,d). This dramatic change in the surface appearance after treating with 100 ppb PFOS solution for 24 h could be a result of the accumulation of PFOS molecules on the crystal surface − and/or degradation of the ZIF-8 crystal surface. − To further explore this and analyze the chemical composition of the flakes (surface debris) present on the surface, energy-dispersive X-ray (EDX) spectroscopy was performed. Figure S11 depicts the elemental mapping of the composite surface after PFOS adsorption along with the EDX spectrum and analogous SEM image.…”

Dual metal Co-anchored nanosheets to catalyze advanced oxidation processes for highly efficient oxytetracycline degradation

“…To demonstrate the above conclusions, electron paramagnetic resonance spectrometer (EPR) analysis was employed to detect the free radicals during catalytic reactions using DMPO and TEMP as the radical-trapping agent. 76 A sixline peak was observed in the EPR spectra and the hyperfine splitting constants, α(H) = 0.78, 9.6, 1.48, and 13.2 G, which is the DMPO/SO 4 ˙− adduct's characteristic peak (Fig. 8E).…”