Cu/Al and Cu/Cr based layered double hydroxide nanoparticles as adsorption materials for water treatment

Abstract

Cu/Al and Cu/Cr layered double hydroxides (LDH) were synthesized using a simple co-precipitation method at room temperature. These particles were further modified by Co+2 incorporation, and calcined at 500 degrees C for synthesis of layered double oxides (LDO). The LDH crystallinity or these samples highly depended on the composition, with Cu/Al-LDH presenting much higher order than Cu/Cr-LDH. High values of methyl orange adsorption were measured especially after calcination. For instance, Cu/Al and Cu/Co/Al LDH exhibited maximum monolayer adsorption capacities of 313 and 240 mg/g, respectively, meanwhile the same particles transformed into LDO presented values of 780 and 583 mg/g.