School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, PR China.
School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, PR China.
Chemosphere. 2022 Dec;308(Pt 1):136148. doi: 10.1016/j.chemosphere.2022.136148. Epub 2022 Aug 29.
To find cost-effective and environmentally friendly free radical activators to stimulate peroxymonosulfate (PMS) oxidative degradation of organic pollutants, nano-FeO/biochar (BC) composites were prepared and characterized in this work to examine their effectiveness in stimulating PMS oxidative degradation of Oxytetracycline (OTC) in water enhanced with electrochemical degradation. When the mass ratio of nano-FeO to BC is 1:1, the catalyst nano-FeO/BC exhibits the most obvious degradation effect on OTC. After 4 h of degradation, the OTC concentrations were reduced from 20 to 2.65 mg L, while treated with a single nano-FeO and a single BC are reduced by only 67.7% and 61.8%. Anions HCO and HPO significantly inhibit OTC degradation, and HCO has a stronger inhibitory effect than HPO, while Cl and NO can promote OTC degradation. Quenching test and electron spin paramagnetic resonance (EPR) detection showed that singlet oxygen (O) was the main active species in the degradation process, followed by hydroxyl radical (·OH). When reused for the third time, the removal rate of OTC by nano-FeO/BC composites with mass ratios of 1:4, 1:2 and 1:1 was still more than 70%. Therefore, the nano-FeO/BC composite is a promising PMS activator, which can realize the rapid oxidative degradation of OTC.
为了寻找经济高效且环保的自由基激活剂来刺激过一硫酸盐（PMS）氧化降解有机污染物，本工作制备并表征了纳米 FeO/生物炭（BC）复合材料，以考察其在电化学强化条件下刺激 PMS 氧化降解水中氧四环素（OTC）的效果。当纳米 FeO 与 BC 的质量比为 1:1 时，催化剂纳米 FeO/BC 对 OTC 的降解效果最为明显。经过 4 h 的降解，OTC 的浓度从 20 mg/L 降低到 2.65 mg/L，而单独使用纳米 FeO 和 BC 仅分别降低了 67.7%和 61.8%。HCO 和 HPO 阴离子显著抑制 OTC 的降解，而 HCO 的抑制作用强于 HPO，而 Cl 和 NO 可以促进 OTC 的降解。猝灭实验和电子顺磁共振（EPR）检测表明，在降解过程中主要的活性物质是单线态氧（O），其次是羟基自由基（·OH）。当以质量比为 1:4、1:2 和 1:1 的比例重复使用三次时，纳米 FeO/BC 复合材料对 OTC 的去除率仍高于 70%。因此，纳米 FeO/BC 复合材料是一种有前途的 PMS 激活剂，可以实现 OTC 的快速氧化降解。
