Abstract
A novel aluminium hydroxide modified porous cellulose aerogel was prepared and used as an effective adsorbent for the removal of fluoride from aqueous solution. The adsorbent was prepared by freeze-drying of cellulose nanofibrils gel followed by impregnation with AlCl3 solution and washing with water. The ensuing sorbent was characterized by SEM observation, XPS, TGA and BET measurement for specific-surface evaluation. The CNF-Al(OH)3 modified aerogel was shown to be an effective adsorbent for fluoride in water, with an adsorption capacity ranging from 20 to 35 mg.g−1, depending on the Al(OH)3 loading. The spent CNF-Al(OH)3 adsorbent was regenerable by washing with NaOH solution and could be reused up to five adsorption-desorption cycles without significant loss of its adsorption capacity. The CNF-Al(OH)3 aerogel showed a great promise to be applied as a reusable adsorbent from a renewable resource for defluorination.
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