School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, 430205, PR China.
J Environ Manage. 2022 Nov 15;322:116054. doi: 10.1016/j.jenvman.2022.116054. Epub 2022 Sep 1.
Peroxymonosulfate-based advanced oxidation (PMS-AOP) is a promising technology for the degradation of environmental pollutants. PMS can be activated by various transition metals, especially cobalt-based catalysts, but pure cobalt catalyst suffers from severe metal leakage and poor cyclicality. This study synthesized NiCoO using a co-precipitation hydrothermal method. The structures, morphologies, and chemical states of the prepared catalysts were hexagonal sheet structures. The activation of PMS by catalyst (NiCoO) is investigated in a PMS/carbonate (PC) system for Orange II degradation. The observed pseudo-first-order rate constants (k) were assessed by the effects of different water matrices and operation conditions. The results show that k with NiCoO were increased by 13 times than that of treatment without NiCoO. This was mainly due to Co and Ni act as electron acceptors to capture electrons from the PMS/PC system, forming a good redox cycle with HSO/SO and oxidizing Co/Ni to produce a large amount of more active components (e.g., O and SO). The good reusability and high stability of NiCoO were demonstrated by five recycle tests. These results suggest that the NiCoO/PC system is an efficient and stable method of pollution remediation.
过一硫酸盐基高级氧化（PMS-AOP）是一种很有前途的环境污染物降解技术。过一硫酸盐可以被各种过渡金属激活，特别是钴基催化剂，但纯钴催化剂存在严重的金属泄漏和较差的循环性。本研究采用共沉淀水热法合成了 NiCoO。所制备催化剂的结构、形貌和化学状态均为六方片状结构。在 PMS/碳酸盐（PC）体系中，通过催化剂（NiCoO）对 Orange II 的降解来研究 PMS 的活化。通过不同水基质和操作条件的影响来评估观察到的准一级速率常数（k）。结果表明，NiCoO 的 k 值比没有 NiCoO 处理时提高了 13 倍。这主要是因为 Co 和 Ni 作为电子受体，从 PMS/PC 体系中捕获电子，与 HSO/ SO 形成良好的氧化还原循环，并将 Co/Ni 氧化生成大量更活跃的成分（例如 O 和 SO）。通过五次循环测试证明了 NiCoO 的良好可重复使用性和高稳定性。这些结果表明，NiCoO/PC 体系是一种高效稳定的污染修复方法。
