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Well-dispersed TiO 2 nanoparticles anchored on Fe 3 O 4 magnetic nanosheets for efficient arsenic removal.

Research paper by Min M Deng, Xiaodong X Wu, Aimei A Zhu, Qiugen Q Zhang, Qinglin Q Liu

Indexed on: 21 Feb '19Published on: 21 Feb '19Published in: Journal of Environmental Management



Abstract

Magnetic iron-titanium binary oxide as an effective adsorbent for arsenic contaminant is a challenge primarily because of their bulk structure and agglomeration effect. Herein, a novel and uniform sandwich-like magnetic FeO@TiO sheets were synthesized by utilizing a facile strategy involving amorphous-to-crystalline transformation and reduction in H, to achieve dispersed anatase TiO nanoparticles with a small size of ∼8 nm anchored on FeO sheets. The resultant FeO@TiO sheets nanocomposite possessing a high specific surface area of ∼89.4 m g and available magnetic susceptibility of ∼20.0 emu g, significantly enhanced the photocatalytic oxidation property of arsenite and considerable adsorption capability for arsenic removal. The adsorption capacities of As(V) and As(III) with UV-assisted from adsorption experimental results were 36.36 and 30.96 mg g, respectively, while the residual concentrations for both As(V) and As(III) were lower than the strict limit of 10 μg L. Adsorption equilibriums were almost reached within 45 min. In addition, the adsorbent exhibited excellent stability over a broad pH range of 3-9 and still maintained great removal efficiency after five time regeneration cycles. Furthermore, except for silicate and phosphate, the extremely weak inhibiting influences of common co-existing ions in arsenic removal process, demonstrated that the developed magnetic FeO@TiO sheets with unique nanostructure could be a promising efficient adsorbent for arsenic removal. Copyright © 2019 Elsevier Ltd. All rights reserved.