Enhanced Adsorption of Chromium by Stabilized Ca/Al–Fe Layered Double Hydroxide Decorated with Ferric Nanoparticles

Abstract

Two-dimension magnetic double layer hydroxide nanoparticles (Ca–Al/Fe LDH) were synthesized by the hydrothermal method. Here, we demonstrate a potential method for efficient chromium removal using Ca–Al/Fe LDH as the adsorbent in water treatment. It was found that Cr(VI) could be successfully eliminated using the Ca–Al/Fe LDH. The method achieved extremely fast removal of Cr(VI) from water with high adsorption capacities. As-prepared Ca–Al/Fe LDH had a high specific surface area and anti-agglomeration property, which contributed to preventing nanometer metal particles from conglomerating during the adsorption process. The recycling studies indicated that Ca–Al/Fe LDH exhibited intense chromium absorption in simulated high levels of pollution wastewater. This modified synthetic approach could extend the application of Ca–Al/Fe LDH for heavy metal control by enhancing their adsorption and desorption capacity in wastewater treatment. Furthermore, the modified synthetic method could be used to produce a suite of stabilized, non-toxic chemical magnetic nanoparticles, and could be used for industrial production.