Removal of chlorophenols in the aquatic environment by activation of peroxymonosulfate with nMnOx@Biochar hybrid composites: Performance and mechanism. (November 2021)

• Record Type: Journal Article
• Authors: Liu, Tong; Cui, Kangping; Chen, Yihan; Li, Chenxuan; Cui, Minshu; Yao, Hongjia; Chen, Yawen; Wang, Shanpeng
• Is Part Of: Chemosphere. Volume 283(2021)
• Publication Date: 2021-11
• Subjects: Biomass -- Carbon-metal nanomaterials -- Singlet oxygen -- Peroxymonosulfate -- Chlorophenols; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.131188
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Functional nMnOx@RBC composites were synthesized via a simple co-precipitation method. The nanomaterials have efficient activity in activating peroxymonosulfate (PMS) for removal of chlorophenols (CPs). Rice husk biochar (RBC) could support nMnOx, and acted as an electron shuttle to mediate electron transfer reaction. nMnOx@RBC had superior catalytic and adsorption properties and exhibited remarkable synergistic effects. This led to complete degradation of 4-chloro-3-methyl phenol (CMP) in 60 min at the natural pH (7.0). Reactive oxygen species (ROS) were also identified via the corresponding scavengers. The results indicated that singlet oxygen ( 1 O2 ) played a dominant role in the degradation of CMP within nMnOx@RBC system. Moreover, the mechanism of CMP decomposition was rationally proposed, and possible intermediate products were deduced. The high degradation performances of diverse CPs were also observed in nMnOx@RBC/PMS system. This research aims to offer novel insights into carbon-metal nanomaterials for the elimination of emerging pollutants. Graphical abstract: Image 1 Highlights: nMnOx@RBC performed superior catalytic activity and sustainability. Various chlorophenols could be efficiently degraded in nMnOx@RBC5 /PMS system. Non-radicals and radicals were devoted to the degradation of CMP. Dechlorination and hydroxylation were the main degradation pathways of CMP.