Abstract
The threaten of ubiquitous antibiotics to human and ecosystem makes it urgent to seek efficient treatment technologies. Peroxymonosulfate (PMS)-based advanced oxidation processes have revealed wide prospects for wastewater treatment via controllable PMS activation for desired ROS generation. Herein, a novel TiO2 photoelectrode decorated with atomically distributed Mn (SA-MnTiO2) was designed via a modified molten salt method (MSM) for photo-electro-catalytic (PEC) activation of PMS. The electron transfer in reduction-/oxidation-state Mn(II)/Mn(III)/Mn(IV) cycles facilitated the cleavage of intramolecular O–O bonds in PMS to preferentially generate hydroxyl radical (HO•). Almost complete degradation of norfloxacin (NOR) was occurred with optimal SA-Mn0.6TiO2 within 15 min, exhibiting high turnover frequency (0.066 min−1). Around 74.8% of total organic carbon was eliminated with a low specific energy consumption of 0.94 kW h/g. The key operational parameters during actual wastewater treatment were inspected for SA-Mn0.6TiO2/PMS system, suggesting the satisfactory stability for practical applications.
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