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Al-Cr-pillared montmorillonite was synthesized by using bentonite and Al-Cr pillaring solutions as starting materials.The basal spacing and specific surface areas of the materials were significantly increased relative to those of untreated clays.When the Al/Cr molar ratio(R) was 0.10,the d(001) value and specific surface area of pillared montmorillonite were 1.9194 nm and 165.7 m2 g -1,respectively.Thermal stability of the materials was determined using calcined tests and X-ray diffraction (XRD) analysis.The materials formed at different R(0.05;0.10;0.15;0.25) exhibit a high thermal stability at 300℃,especially at initial R=0.10,the basal interlayer spacing of materials is stabilized at 1.7313 nm after calcined at 500℃ for 2 h.Adsorption behavior of the materials was studied by adsorption experiments.The results show that the Al-Cr-pillared montmorillonites exhibit much stronger adsorption capacity on Cr 6+ in aqueous solution than untreated clays do.
Al-Cr-pillared montmorillonite was synthesized by using bentonite and Al-Cr pillaring solutions as starting materials. The basal spacing and specific surface areas of the materials were significantly increased relative to those of untreated clays. When the Al / Cr molar ratio (R ) was 0.10, the d (001) value and specific surface area of pillared montmorillonite were 1.9194 nm and 165.7 m2 g -1, respectively.Thermal stability of the materials was determined using calcined tests and X-ray diffraction (XRD) analysis. materials formed at different R (0.05; 0.10; 0.15; 0.25) exhibit a high thermal stability at 300 ° C, especially at initial R = 0.10, the basal interlayer spacing of materials is stabilized at 1.7313 nm after calcined at 500 ° C for 2 h. Adsorption behavior of the materials was studied by aeration experiments. The results show that the Al-Cr-pillared montmorillonites exhibit much stronger adsorption capacity on Cr 6+ in aqueous solution than untreated clays do.