Investigation of phosphorus removal with layered double hydroxides

In this study, phosphate removal with synthesized anionic clays named double layered hydroxides. Two different types of LDH are produced with traditional co-precipitation methods which are Mg-Fe LDH from MgCl2 - FeCl3 salts and Mg-Al LDH from MgCl2 - AlCl3 salts. Synthesized materials are classified by particle size with screening analysis and data obtained from adsorption experiments are applied to adsorption isotherms. %84 and 86 removal efficiencies were obtained with 0,5 g 125-180 µm Mg-Fe LDH and 0,05 g 125-180 µm Mg-Al LDH respectively. Adsorption of phosphate with Mg-Fe LDH is best described with Freundlich isotherm while Mg-Al LDH is best described with Langmuir isotherm. Adsorption capacities of 125-180 µm Mg-Fe LDH and 125-180 µm Mg-Al LDH are 3 mg/g ve 57,5 mg/g respectively.