Synthesis and Characterization of Cryptomelane and Adsorption of Pb~(2+)
Cryptomelane is an effective water treatment agent with high adsorptive ability for heavy metals. Cryptomelane was prepared by precipitation method and characterized as tetragonal crystal with specific surface area and abundant hydroxyl groups at its surface. The adsorption of Pb2+ by synthesis cryptomelane in aqueous solution was studied and the reaction mechanism of adsorption was also discussed. Results showed that the adsorption mechanism of Pb2+ on cryptomelane was well in accordance with Langmuir model when concentration of Pb2+ was less than 300mg/L and maximum adsorption amount of Pb2+ was 126.58mg/g.