改性合成方钠石对重金属离子Cu^2+、Pb^2+的吸附

Study on adsorption of Cu^2+and Pb^2+by synthetic sodalite under different modified conditions

采用水热合成法以高岭石为原料合成方钠石,并将合成的方钠石用盐酸和双氧水改性。利用SEM、XRD和BET等对产物进行表征,对比了不同合成条件下的方钠石的组织形态以及微观结构的变化,研究了不同改性下条件方钠石对重金属离子Cu2+、Pb2+的吸附性能。结果表明:HTPS、HA-HTPS和HP-HTPS的比表面积分别为104.78、112.64、127.71 m2/g,三者的平均孔径相差不大。HTPS、HA-HTPS、HP-HTPS对Cu2+和Pb2+的理论最大吸附量分别为61.73、251.89、62.85 mg/g和265.95、65.88、283.29 mg/g,三者对2种重金属离子的吸附等温线均符合Langmuir吸附等温模型,该研究提供了一种应用合成与改性方钠石高效去除水体重金属离子的方法。

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.