Degradation of N-methylpyrrolidone by persulfate activated with iron-molybdenum modified biochar
Biochar materials loaded with Mo2C and Fe0 were prepared by hydrothermal-calcination as acti-vators of peroxodisulfide(PDS)for the degradation of N-methylpyrrolidone(NMP).SEM,XRD and FTIR were used to characterize them.The effects of catalyst dosage,persulfate concentration and initial pH on the degradation of NMP by Fe0-Mo2C-BC activated persulfate system were investigated.The removal rate of NMP reached 99％after 40 min at a NMP concentration of 100 mg/L,Fe0-Mo2C-BC dosage of 0.4 g/L,PDS concentration of 1 g/L and reaction temperature of 25℃.The Fe0-Mo2C-BC/PDS system maintained high catalytic activity in a wide pH range(3～9),and its degradation ability was less affected by the coexis-ting anions(Cl-,SO42-,NO3-).The quenching experiments revealed that hydroxyl radicals(·OH)played a major role in the reaction,while sulfate radicals(·SO4-)and singlet oxygen(1O2)played a minor role.
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