锰钾矿型化合物的合成和表征及对Pb^(2+)的吸附

Synthesis and Characterization of Cryptomelane and Adsorption of Pb^(2+)

锰钾矿是一种对重金属离子有较强吸附作用的水处理剂。文章表征了由沉淀法合成的锰钾矿型化合物的多种理化特性,并应用于铅离子吸附的研究,对吸附反应机理进行了初步探讨。实验结果表明:合成的锰钾矿化合物属四方晶形,具有较大的比表面积和丰富的表面羟基,在中性pH值、低粒径条件下对铅离子具有较强的吸附能力。当铅离子的质量浓度<300mg/L时,吸附等温线符合Langmuir模型,最大理论吸附量为126.58mg/g。

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.