Hollow rod assembly of Fe-MnO2 nanosheets prepared by in situ redox etching for the ultra-fast removal of antimony. (October 2022)

• Record Type: Journal Article
• Authors: Jiang, Tong; Xie, Nianyi; Guo, Ying; Wang, Yao; Guo, Rongxiu; Wang, Yiming; Niu, Dun; Zhang, Gang; Zhang, Xinyue; Sun, Hongbin
• Is Part Of: Journal of water process engineering. Volume 49(2022)
• Publication Date: 2022-10
• Subjects: Ultra-fast adsorption -- Fe-doped MnO2 -- Antimony -- In-situ redox etching-growth; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2022.103120
• Languages: English
• ISSNs: 2214-7144

Abstract

Abstract: Antimony pollution is of increasing concern and designing efficient adsorbents to solve this problem of antimony removal from wastewater has shown significance in both science and practical application. In this work, a Fe-Mn bimetal oxides composite is fabricated with an in situ redox etching-growth strategy. The obtained adsorbent is made of lattice-widening MnO2 nanosheets, which are doped with Fe ion homogeneously. The nanosheets stack to a hollow sea cucumber-like structure, which promotes the facile adsorption of Sb with both fast and large capacity adsorption. It can reach the adsorption equilibrium in 5 min and has a high capacity of 347.2 mg/g. The excellent adsorption properties benefit from the special crystal structure， and the antimony is closely connected to the adsorbent by binding modes of inner-sphere complexation, redox, and hydrogen bonding. Graphical abstract: In-situ redox etching-growth of FDM via MIL-101 template was used to adsorb antimony efficiently. Unlabelled Image Highlights: High-efficient adsorption of antimony is achieved by the lattice-enwidened Fe-doped MnO2. In situ redox etching growth of Fe-MOF produces Fe-doped MnO2 nanosheets. Nanosheet-assembled sea cucumber-like structure exposes most adsorption sites. The FDM exhibits ultra-fast adsorption within 5 min and >90 % removal rate of antimony.