Effects of Drying Operation on the Mn2+ Removal Activity of MnOx: Performance and Mechanism DOI Open Access
Ruifeng Zhang, Lina Yang,

Jing Yang

et al.

Water, Journal Year: 2025, Volume and Issue: 17(2), P. 261 - 261

Published: Jan. 17, 2025

Mn2+ is a prevalent contaminant in groundwater. In this study, manganese oxides (MnOx) were prepared via redox method to remove from water. The effects of the drying operation preparation process, including heat at 20–120 °C with different times and freeze methods, on structural properties, removal performance mechanisms investigated. results indicate that conditions can significantly affect stability MnOx. MnOx dried 50 for 12 h exhibited best efficiency stability, an adsorption capacity 125.7 mg/g efficacy 95.1% after six reuse cycles. pathway experiments revealed sample had superior catalytic oxidation abilities Mn2+, while other samples removed by primarily relying process. investigation structure excessive led shrinkage oxide particles, reduction surface voids, decrease hydroxyl groups. Conversely, insufficient time or temperatures resulted high water content MnOx, which occupied active sites. XPS analysis indicated relied Mn(III) adsorbed oxygen With inadequate drying, large amount Mn(II) remained surface, over-drying conversion Mn(IV), reducing activity resulting low stability.

Language: Английский

Effects of Drying Operation on the Mn2+ Removal Activity of MnOx: Performance and Mechanism DOI Open Access
Ruifeng Zhang, Lina Yang,

Jing Yang

et al.

Water, Journal Year: 2025, Volume and Issue: 17(2), P. 261 - 261

Published: Jan. 17, 2025

Mn2+ is a prevalent contaminant in groundwater. In this study, manganese oxides (MnOx) were prepared via redox method to remove from water. The effects of the drying operation preparation process, including heat at 20–120 °C with different times and freeze methods, on structural properties, removal performance mechanisms investigated. results indicate that conditions can significantly affect stability MnOx. MnOx dried 50 for 12 h exhibited best efficiency stability, an adsorption capacity 125.7 mg/g efficacy 95.1% after six reuse cycles. pathway experiments revealed sample had superior catalytic oxidation abilities Mn2+, while other samples removed by primarily relying process. investigation structure excessive led shrinkage oxide particles, reduction surface voids, decrease hydroxyl groups. Conversely, insufficient time or temperatures resulted high water content MnOx, which occupied active sites. XPS analysis indicated relied Mn(III) adsorbed oxygen With inadequate drying, large amount Mn(II) remained surface, over-drying conversion Mn(IV), reducing activity resulting low stability.

Language: Английский

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