Iodide removal by resorcinol-formaldehyde carbon aerogels

Domán, Andrea and Battalgazy, Bekassyl and Dobos, Gábor and Kiss, Gábor and Tauanov, Zhandos and László, Krisztina and Zorpas, Antonis A. and Inglezakis, Vassilis J. (2022) Iodide removal by resorcinol-formaldehyde carbon aerogels. Materials, 15 (19). 6885. ISSN 1996-1944 (https://doi.org/10.3390/ma15196885)

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Abstract

The adsorption technique is widely used in water purification, and its efficiency can be significantly improved by target-specific adsorbent design. Research on iodine and its ion removal from water has attracted a great deal of interest due to increased concentrations in the environment and acute toxic effects, e.g., in human thyroid cells. In this work, the iodide removal performance of two high-surface-area resorcinol–formaldehyde-based carbon aerogels was studied under acidic conditions. The BET surface area was 790 m 2/g (RF_ac) and 375 m 2/g (RMF-GO), with a corresponding micropore ratio of 36 and 26%, respectively. Both aerogels showed outstanding adsorption capacity, exceeding the reported performance of other carbons and Ag-doped materials. Owing to its basic nature, the RMF-GO carbon aerogel showed higher I − capacity, up to 97 mg/g, than the acidic RF_ac, which reached a capacity of 82 mg/g. The surface chemistry of the aerogels also played a distinct role in the removal. In terms of kinetics, RF_ac removed 60% of the iodide ions and RMF-GO 30% within 8 h. The removal kinetics was of the first order, with a half-life of 1.94 and 1.70 h, respectively.

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