Dual metal Co-anchored nanosheets to catalyze advanced oxidation processes for highly efficient oxytetracycline degradation,Environmental Science: Nano

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Dual metal Co-anchored nanosheets to catalyze advanced oxidation processes for highly efficient oxytetracycline degradation
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2022-09-27 , DOI: 10.1039/d2en00693f
Meng Li _{1,

2} , Jian-Fang Yan ₂ , Zhao-Xin Zhang ₃ , Wei Han ₄ , Shao-Qi Zhou ₅ , King Lun Yeung _{1,

4} , Ce-Hui Mo ₂

Affiliation

Advanced oxidation processes (AOPs) as an efficient oxidation technology, have been extensively applied for degrading recalcitrant organic contaminants via the generated reactive oxygen species from the activation reaction of catalysts. However, the leaching of metal ions and the consumption of catalysts have brought the incomplete degradation of target contaminants, the generation of wastewater containing toxicity, and the increase in costs. Here, dual metal Fe and Co co-doped g-C₃N₄ composite (N/CoFeX) was successfully synthesized and used as an efficient peroxymonosulfate (PMS) activator for oxytetracycline (OTC) degradation with a slight leaching of metal ions and superb degradation performance. In addition, the specific insertion structure and the formation of the Fe–O–Co bond into N/CoFeX can bring remarkable catalytic ability and stability, which further prevents the leaching of Co (0.004 mg L⁻¹) and Fe ions (0.005 mg L⁻¹) and achieves an efficient OTC removal rate (100%) within 60 min. Further calculations show that the lowest adsorption energy of PMS on N/CoFeX aids in PMS activation and can boost the electron transfer from organic pollutants to PMS, further enhancing the generation of radicals and the decomposition of OTC. The relatively slight toxicity of the degradation intermediates examined by proteomics analysis strongly as well as minor leaching of metal ions exhibit great potential for large-scale applications of AOPs in the field of wastewater purification and remediation.

中文翻译：

双金属共锚纳米片催化高级氧化过程实现高效土霉素降解

高级氧化工艺（AOPs）作为一种高效的氧化技术，已被广泛应用于通过催化剂活化反应产生的活性氧来降解难降解的有机污染物。然而，金属离子的浸出和催化剂的消耗，带来了目标污染物降解不完全，产生含毒废水，增加了成本。这里，双金属 Fe 和 Co 共掺杂 gC ₃ N ₄复合材料（N / CoFeX）成功合成并用作有效的过氧单硫酸盐（PMS）活化剂，用于土霉素（OTC）降解，具有轻微的金属离子浸出和优异的降解性能。此外，特定的插入结构和 Fe-O-Co 键在 N/CoFeX 中的形成可以带来显着的催化能力和稳定性，进一步防止 Co (0.004 mg L ^-1 ) 和 Fe 离子 (0.005 mg L ^-1) 并在 60 分钟内达到有效的 OTC 去除率 (100%)。进一步计算表明，PMS 在 N/CoFeX 上的最低吸附能有助于 PMS 的活化，并可以促进电子从有机污染物向 PMS 的转移，进一步促进自由基的产生和 OTC 的分解。通过蛋白质组学分析检测到的降解中间体的相对轻微的毒性以及金属离子的少量浸出显示出 AOP 在废水净化和修复领域大规模应用的巨大潜力。

更新日期：2022-09-27

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