For EPR detection, 5,5‐Dimethyl‐1‐pyrroline N‐oxide (DMPO) was employed as the •OH trapping agent. Mn‐N/C (1 mg) was added into the NaAc‐HAc buffer (pH 4.0) containing H2O2 (1.0 mL) and 100 µm DMPO. The above mixture solutions were transferred to a quartz tube for EPR assay after mixing by sonication for 5 min.
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