Author/Authors :
Sihombing, Riwandi university of indonesia - Faculty of Mathematics and Natural Sciences - Department of Chemistry, Indonesia , Krisnandi, Yuni Krisyuningsih university of indonesia - Faculty of Mathematics and Natural Sciences - Department of Chemistry, Indonesia , Widya, Rahma university of indonesia - Faculty of Mathematics and Natural Sciences - Department of Chemistry, Indonesia , Luthfiyah, Siti Zahrotul university of indonesia - Faculty of Mathematics and Natural Sciences - Department of Chemistry, Indonesia , Yunarti, Rika Tri Korea University of Science and Technology - Department of Clean Energy and Chemical Engineering, South Korea , Yunarti, Rika Tri university of indonesia - Faculty of Mathematics and Natural Sciences - Department of Chemistry, Indonesia
Abstract :
In order to enhance adsorption capacity of gibbsite (Al(OH)_3 as an adsorbent for the adsorption of phosphate in water, gibbsite was modified through lithium-intercalation. The purification method of Tributh and Lagaly was applied prior to intercalation. The Li-Intercalation was prepared by the dispersion of gibbsite into LiCl solution for 24 hours. This intercalation formed an cationic clay with the structure of [LiAl_2(OH)_6]^+ and exchangeable Cl^- anions in the gibbsite interlayer. A phosphate adsorption test using Lithium-intercalated gibbsite (LIG) resulted in optimum adsorption occurring at pH 4.5 with an adsorption capacity of 11.198 mg phosphate/g LIG which is equivalent with 1.04 wt% LIG. The adsorption capacity decreased with decreasing amounts of H_2PO_4^- /HPO4 - species in the solution. This study showed that LIG has potential as an adsorbent for phosphate in an aqueous solution with pH 4.5–9.5.
Keywords :
adsorption , gibbsite , intercalation , lithium , phosphate
