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Iodide Removal by Resorcinol-Formaldehyde Carbon Aerogels
Andrea Domán1, Bekassyl Battalgazy2, Gábor Dobos3
1Surface Chemistry Group, Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, 1111 Budapest, Hungary.
Materials (Basel, Switzerland)
|October 14, 2022
Summary
Two novel carbon aerogels effectively remove iodide from water. RMF-GO aerogel demonstrated higher adsorption capacity (97 mg/g) than RF_ac (82 mg/g), offering a promising solution for water purification.
Area of Science:
- Materials Science
- Environmental Science
- Chemistry
Background:
- Adsorption is key for water purification, with adsorbent design enhancing efficiency.
- Iodine and iodide removal is critical due to environmental concerns and toxicity, particularly affecting human thyroid cells.
Purpose of the Study:
- To investigate the iodide removal performance of two resorcinol-formaldehyde-based carbon aerogels.
- To compare the adsorption capacity and kinetics of RF_ac and RMF-GO aerogels under acidic conditions.
Main Methods:
- Synthesis of high-surface-area resorcinol-formaldehyde carbon aerogels (RF_ac and RMF-GO).
- Characterization of aerogels using BET surface area analysis (790 m²/g for RF_ac, 375 m²/g for RMF-GO).
- Experimental determination of iodide adsorption capacity and removal kinetics.
Main Results:
- Both aerogels exhibited high adsorption capacities, surpassing other carbon materials and Ag-doped alternatives.
- RMF-GO aerogel showed a higher iodide capacity (up to 97 mg/g) compared to RF_ac (82 mg/g), attributed to its basic surface chemistry.
- RF_ac demonstrated faster initial iodide removal (60% in 8 h) than RMF-GO (30% in 8 h), with first-order kinetics and short half-lives (1.94 h for RF_ac, 1.70 h for RMF-GO).
Conclusions:
- Resorcinol-formaldehyde-based carbon aerogels are highly effective for iodide removal from water.
- Surface chemistry significantly influences adsorption capacity and kinetics, with RMF-GO showing superior capacity and RF_ac faster initial removal.
- These aerogels represent a promising advancement in water purification technologies for targeted contaminant removal.
