Study on adsorption of Cu²⁺ and Pb²⁺ by synthetic

Sodalite was synthesized from kaolinite by hydrothermal method, and then modified by hydrochloric acid and hydrogen peroxide. SEM, XRD and BET were used to characterize, compare and study morphological and microstructural changes of sodalites under different synthetic conditions, as well as the adsorption of Cu²⁺ and Pb²⁺ of different modified sodalites.Results showed that the specific surface areas of HTPS, HA-HTPS and HP-HTPS are 104.78 m2/g, 112.64 m2/g and 127.71 m2/g respectively with similar average pore sizes. The maximum theoretical adsorption capacity of HTPS on Cu²⁺ and Pb²⁺ were 61.73 mg/g and 251.89 mg/g, that of HA-HTPS were 62.85 mg/g and 265.95 mg/g, and HP-HTPS 65.88 mg/g and 283.29 mg/g, adsorption isotherms of all three in accordance with Langmuir adsorption isotherm model. This study hopes to provide an efficient method for removal of heavy metal ions from aqueous solution using synthetic and modified sodalite.