A persulfate oxidation system for removing acid orange from aqueous solution: Evaluation and degradation mechanism. (15th November 2022)

• Record Type: Journal Article
• Authors: Zhou, Xuan; Li, Xinyuan; Xu, Caixia; Yang, Liu; Yang, Guangzhong; Guo, Li
• Is Part Of: Journal of environmental management. Volume 322(2022)
• Publication Date: 2022-11-15
• Subjects: NiCo2O4 -- Peroxymonosulfate/carbonate -- Co-activation -- Orange II -- Mechanism; AOP advanced oxidation processes -- PC peroxymonosulfate/carbonate -- PMS peroxymonosulfate -- PMS-AOP peroxymonosulfate-based advanced oxidation -- SEM scanning electron microscopy -- TEM transmission electron microscopy -- XPS X-ray photoelectron spectroscopy; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2022.116054
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: 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 NiCo2 O4 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 (NiCo2 O4 ) is investigated in a PMS/carbonate (PC) system for Orange II degradation. The observed pseudo-first-order rate constants (k1 ) were assessed by the effects of different water matrices and operation conditions. The results show that kobs with NiCo2 O4 were increased by 13 times than that of treatment without NiCo2 O4 . This was mainly due to Co 3+ and Ni 3+ act as electron acceptors to capture electrons from the PMS/PC system, forming a good redox cycle with HSO5 − /SO5 − and oxidizing Co 2+ /Ni 2+ to produce a large amount of more active components (e.g., 1 O2 and SO4 ⋅- ). The good reusability and high stability of NiCo2 O4 were demonstrated by five recycle tests. These results suggest that the NiCo2 O4 /PC system is an efficient and stable method of pollution remediation. Graphical abstract: Schematic diagram of NiCo2 O4 and CO3 2− co-catalyzed PMS for OII degradation. Image 1 Highlights: Novel NiCo2 O4 catalyst was synthesized for Peroxymonosulfate activation. Carbonate enhanced catalytic activity of NiCo2 O4 for PMS activation. The dominant reactive species were SO4 ·- and nonradical 1 O2. SO5 ⋅- and CO3 2− (OH − ) were electron and proton acceptors to promote 1 O2 . NiCo2 O4 is magnetic and can be recycled and displayed good catalytic and stability.