College of Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
J Hazard Mater. 2022 Oct 5;439:129572. doi: 10.1016/j.jhazmat.2022.129572. Epub 2022 Jul 11.
The disposal and recovery of solid wastes and the remediation of polycyclic aromatic hydrocarbons (PAHs) are the key issues of environmental pollution control. In this study, micro cobalt loaded on iron-carbon-vermiculite composite (Co-ICV) was prepared for the first time by the reutilization of waste self-heating pad as a carrier of cobalt catalyst, which exhibited better performance than bulk cobalt catalyst in peroxymonosulfate (PMS) activation for the degradation of naphthalene (NAP) in water. Above 98% of NAP (2.0 mg/L) was effectively eliminated within 15 min by the Co-ICV (0.2 g/L) activated PMS (0.5 mmol/L) in a pH range of 5.0-9.0. High magnetism and very limited cobalt leaching realized the convenient separation and stable reusability of Co-ICV. Mechanism investigation indicated that Co(II) species were the main active sites to activate PMS decomposition for the generation of SO and OH, contributing to the rapid degradation of NAP. Meanwhile, the NAP degradation pathways were deduced via combining the identification of intermediates and the calculation of frontier electron densities (FEDs). Furthermore, the ability of the Co-ICV/PMS system for the NAP degradation in actual lake water and the removal of other refractory pollutants demonstrated that the combination of Co-ICV and PMS was a prospective method for the removal of PAHs. Overall, Co-ICV is a green and promising activator of PMS, and the future development will provide more insights into the comprehensive utilization of solid wastes for the remediation of wastewater containing PAHs.
固体废物的处置和回收以及多环芳烃（PAHs）的修复是环境污染控制的关键问题。在本研究中，首次通过再利用废自热垫作为钴催化剂载体，制备了负载在铁-碳-蛭石复合材料（Co-ICV）上的纳米钴催化剂，该催化剂在过一硫酸盐（PMS）活化方面表现出比体相钴催化剂更好的性能，可用于水中萘（NAP）的降解。在 pH 值为 5.0-9.0 的范围内，Co-ICV（0.2 g/L）活化 PMS（0.5 mmol/L）可在 15 min 内有效去除 98%以上（2.0 mg/L）的 NAP。高磁性能和极少量的钴浸出实现了 Co-ICV 的方便分离和稳定的可重复使用性。机理研究表明，Co(II)物种是活化 PMS 分解产生 SO 和 OH 的主要活性位点，有助于 NAP 的快速降解。同时，通过结合中间产物的鉴定和前线电子密度（FED）的计算，推导出了 NAP 的降解途径。此外，Co-ICV/PMS 体系在实际湖水和其他难降解污染物去除中对 NAP 降解的能力表明，Co-ICV 和 PMS 的结合是去除 PAHs 的一种有前途的方法。总的来说，Co-ICV 是一种绿色且有前景的 PMS 活化剂，未来的发展将为利用固体废物综合修复含 PAHs 废水提供更多的见解。
