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Magnetic Carbon Nanocages: An Advanced Architecture with Surface- and Morphology-Enhanced Removal Capacity for Arsenites

Petala, E and Georgiou, Y and Kostas, V and Dimos, K and Karakassides, MA and Deligiannakis, Y and Aparicio, C and Tuček, J and Zbořil, R (2017) Magnetic Carbon Nanocages: An Advanced Architecture with Surface- and Morphology-Enhanced Removal Capacity for Arsenites. ACS Sustainable Chemistry and Engineering, 5. pp. 5782-5792.

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Magnetic carbon nanocages (Mag@CNCs) were synthesized via a green one-step process using pine resin and iron nitrate salt as a carbon and iron source, respectively. To produce Mag@CNCs, pristine materials have been carbonized at high temperature under inert atmosphere. The structural, textural, and surface properties of as-synthesized Mag@CNCs were studied employing microscopic, spectroscopic, and surface physicochemical methods. The obtained results showed that the new Mag@CNCs have significant surface area (177 m g ) with both microporosity and mesoporosity. Moreover, the material exhibits a homogeneous distribution of core-shell-type magnetic nanoparticles within the carbon matrix, formed by iron carbide (Fe C) and metallic iron (α-Fe), with sizes of 20-100 nm, surrounded by a few graphitic layers-walls. Most importantly, Mag@CNCs were tested as absorbents for As(III) removal from aqueous solutions, showing a total of 263.9 mg As(III)-uptake capacity per gram of material at pH = 7, a record sorption capacity value among all previously tested iron-based materials and one of highest values among all reported sorbents so far. The adsorbed As(III) species are anchored at the surface of Mag@CNCs, as demonstrated by high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy measurements. The pH-edge As(III)-adsorption experiments combined with theoretical surface complexation modeling allowed a detailed understanding of the interfacial properties of Mag@CNCs, and hence the As(III) uptake mechanism. The analysis revealed that As(III) binds on two types of surface sites of Mag@CNCs, i.e., on carbon-surface species (≡C OH ) and on Fe-oxide layer (≡FeOH ) of nanoparticles. This exemplifies that the advanced morphology- and surface-driven synergistic properties of the Mag@CNCs material are crucial for its As(III)-uptake performance. 2 -1 3 x 2 2

Item Type: Article
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 12 Jun 2018 01:35
Last Modified: 13 Apr 2021 07:12
DOI: 10.1021/acssuschemeng.7b00394