Ca-Al layered double hydroxides synthesis and Ca-Al layered double hydroxides/biochar composite have been performed by coprecipitation method and characterized by XRD, FT-IR, BET, TG-DTA and SEM-EDX analyzes. Preparation composite of Ca-Al layered double hydroxides with biochar in this study aims to increase the surface area of the material so that it can increase its effectiveness as an adsorb…