(562o) Development of Adsorbent Based on Layered Double Hydroxides Structure with High Mg/Al Ratio for Heavy Metal Removal

As industrialization progresses, various environmental problems arise due to the influx of wastewater from various routes into rivers. Especially, the heavy metal ions introduced into the water cause a lot of diseases in the human body, and various methods for reducing the heavy metal ions in wastewater have been studied. Among several methods, the adsorption technology has various advantages such as easy application and low cost, but its performance is lower than the existing heavy metal removal technologies such as ion exchange and membrane separation. Therefore, it is necessary to develop effective adsorbent for efficient adsorption processes. Among various adsorbents, layered double hydroxide has attracted lots of attention as an adsorbent of heavy metals because it is capable of substituting various anions in the interlayer region and giving various applications. In this study, we focused on the fact that Mg(OH)₂ on the surface of layered double hydroxides exhibits high affinity to heavy metals such as copper and chromium, and developed an adsorbent with increased Mg(OH)₂ ratio while maintaining the existing structure. For layered double hydroxides different ratios of Mg/Al, the adsorption capacity of heavy metals including copper and chromium was measured and the effect of Mg/Al ratio of layered double hydroxides on heavy metal adsorption capacity was investigated by XRD analysis.