Adsorptive Removal of Cd (II) Ion from Aqueous Solution by Polyoxometalate Intercalated MgAl LDH

摘要

Keggin type polyoxometalate (POM) α-SiW_(12)O_(40~(4-)) has successfully intercalated into the interlayer space of MgAl LDH through facile ion exchange method. The pristine MgAl LDH was firstly synthesized by coprecipitation method. The structure of MgAl LDH and its intercalated form were characterized by X-ray diffraction and FTIR analysis. The obtained results indicated the formation of MgAl LDH with brucite-like layer structure. Moreover, the POM intercalated MgAl LDH sample exhibited an expansion of interlayer distance that indicates the success of the POM intercalation. Adsorptive removal of Cd(II) ion from aqueous solution by using pristine MgAl LDH and MgAl POM was conducted in batch method. The results showed that the MgAl POM has a higher adsorption capacity for Cd(II) removal than the pristine MgAl LDH.