Abstract
An electric-assisted peroxymonosulfate (PMS) activation system is developed for sustainable treatment of wastewater. S-doped CoO nanoflower grown on Ti plate (S-CoO/Ti) electrocatalyst is fabricated via one-step electrodeposition. S doping can increase the electron density of Co atoms, inclined to form Co2+ for PMS activation. The electrons from S-CoO/Ti cathode play dual roles: (1) directly activating PMS, and (2) promoting Co2+ regeneration for sustainable activation of PMS. The system generates energetic oxidative species (OH, SO4−, O2−, 1O2 and Co4+). Co4+ species accomplished via the reaction between Co2+ and PMS are dominantly responsible for tetracycline (TC) degradation. Almost 100% TC is removed within 20 min (C0 = 25 μM), and the toxicity of treated wastewater is reduced significantly. The S-CoO/PMS system exhibits a superior performance towards TC degradation in a wide pH range from 3 to 11. The removal of TC in natural water matrices reaches 97% within 30 min via continuous-flow process, showing 87% TOC removal within 2 h. Moreover, it remains highly stable lasting 60 h and the electric energy per order, which is much lower than that for advanced oxidation processes reported.
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