College of Materials and Chemistry, Zhejiang Province Key Laboratory of Magnetic Materials, China Jiliang University, Hangzhou 310018, China.
College of Materials and Chemistry, Zhejiang Province Key Laboratory of Magnetic Materials, China Jiliang University, Hangzhou 310018, China.
J Colloid Interface Sci. 2024 Jun;663:909-918. doi: 10.1016/j.jcis.2024.03.010. Epub 2024 Mar 2.
Peroxymonosulfate (PMS) is widely employed to generate oxygen-containing reactive species for ciprofloxacin (CIP) degradation. Herein, cobalt oxyhydroxide @activated carbon (CoOOH@AC) was synthesized via a wet chemical sedimentation method to activate PMS for degradation of CIP. The result suggested AC can support the vertical growth of CoOOH nanosheets to expose high-activity Co-contained edges, possessing efficient PMS activation and degradation activity and catalytic stability. In the presence of 3.0 mg of optimal CoOOH@AC and 2 mM PMS, 96.8 % of CIP was degraded within 10 min, approximately 11.6 and 9.97 times greater than those of CoOOH/PMS and AC/PMS systems. Notably, it was disclosed that the optimal CoOOH@AC/PMS system still exhibited efficient catalytic performance in a wide pH range, different organics and common co-existing ions. Quenching experiments and electron paramagnetic resonance indicated that both radical and non-radical processes contributed to the degradation of CIP, with O and direct electron transfer accounting for the non-radical pathway and SO and •OH serving as the main radical active species. Finally, possible CIP degradation pathways were proposed based on high-performance liquid chromatography-mass spectrometry. This study provided an alternate method for wastewater treatment based on PMS catalyzed by cobalt-based hydroxide.
过一硫酸盐（PMS）广泛用于生成含氧反应性物种以降解环丙沙星（CIP）。本文通过湿化学沉淀法合成了钴氢氧化物@活性炭（CoOOH@AC），以激活 PMS 来降解 CIP。结果表明，AC 可以支持 CoOOH 纳米片的垂直生长，暴露高活性的含 Co 边缘，具有高效的 PMS 激活和降解活性以及催化稳定性。在 3.0 mg 最佳 CoOOH@AC 和 2 mM PMS 的存在下，CIP 在 10 min 内降解了 96.8%，分别是 CoOOH/PMS 和 AC/PMS 系统的 11.6 倍和 9.97 倍。值得注意的是，该最佳 CoOOH@AC/PMS 体系在较宽的 pH 范围、不同有机物和常见共存离子中仍表现出高效的催化性能。猝灭实验和电子顺磁共振表明，自由基和非自由基过程都有助于 CIP 的降解，其中 O 和直接电子转移是非自由基途径的主要贡献者，而 SO 和 •OH 则是主要的自由基活性物种。最后，根据高效液相色谱-质谱提出了可能的 CIP 降解途径。本研究为基于钴基氢氧化物催化的 PMS 的废水处理提供了一种替代方法。
