A montmorillonite inorgano-intercalation compound(MIIC) was synthesized by using a purified Na-exchanged bentonite(PNaB) as a matrix and Al-pillaring ion as an intercalating reagent under microwave irradiation.The synthesized products were characterized by X-ray diffraction(XRD),27Al magic angle sample-spinning nuclear magnetic resonance(27Al MAS NMR),specific surface area(BET) measurement,and adsorption density determination.The results show that,at 5% solid(PNaB) concentration and 7 minutes irradiation in a 130 W microwave oven,the basal spacing d(001) of the synthesized MIIC increases to 1.740 nm from the original 1.218 nm of PNaB.The MIIC has much higher adsorptive densities to F-and Cr6+ from aqueous solution than the PNaB.The adsorption isotherm of F-on the MIIC follows the Freundlich equation,and the increased adsorption is mainly due to the porous structure of the MIIC which created larger adsorption surfaces.The adsorption isotherm of Cr6+ on MIIC follows the Langmuir equation and the adsorption is mainly monolayer as a result of chemisorptions.
