thesisThis work studies the removal of arsenic (V), arsenate, and arsenic (III), arsenite, from aqueous solution using calcined Quintinite-3T (Al/Mg mixed oxides) and calcined La-LDHs (La/Mg mixed oxides). The two adsorbents Quintinite-3T and La-LDHs were prepared, calcined at different temperatures, and characterized by XRD, BET, and SEM. The surface area of the calcined Quintinite-3T was 193.4 m2/g, while the surface area of the calcined La-LDHs was 112.4 m2/g. The particles size ranged from 12 to 56 nm for the uncalcined Quintinite-3T and from 24 to 42 nm for the calcined Quintinite-3T. The particle size ranged from 27 to 56 nm for as-synthesized La-LDHs and from 18 to 35 nm for the calcined La-LDHs. Also, new hybrid adsorbent was synthesized and characterized as well. Kinetic analysis, adsorption isotherm, and factors affecting the adsorption were investigated. Calcined Quintinite-3T retained As(v) and did not release it back to water even after an entire month. The adsorption of As(V) and As(III) by calcined La-LDHs increased with time up to 2 weeks and 1 month, respectively
