Adsorption Isotherm of Cr(VI) Using Mg/Al Hydrotalcite with Molar Ratio 2:1

Abstract

Hydrotalcite is a material which is used in various application and one of them as an adsorbent of Cr(VI). Hydrotalcite was synthesized using co-precipitation method with Al(NO­₃)₃.9H₂O and Mg(NO₃)₂.6H₂O as raw materials. This research aim to study the initial concentration and adsorption isotherm of Cr(VI) by using Mg/Al hydrotalcite in 180 minutes contact time. The Optimum initial concentration of Cr(VI) was 675 mg/L with 55,57 mg/g adsorption capacity. Isotherm adsorption was studied using Langmuir and Freundlich model. Based on the result, the adsorption of Cr(VI) fitted well with Langmuir isotherm model by 0,997 coefficient of determination