Synthesis and Characterization of Al-Cr-Pillared Montmorillonite with High Thermal Stability and Adsorption Capacity

• Published in: Journal of Wuhan University of Technology. Materials science edition Vol. 19; no. 1; pp. 51 - 53
• Main Authors: Cao, Ming-Li, Liu, Shi-Zhen, Yu, Yong-Fu
• Format: Journal Article
• Language: English
• Published: Wuhan Springer Nature B.V 01.03.2004; Wuhan University of Technology
• Subjects: Adsorption; Al-Cr-柱状蒙脱石; Aqueous solutions; Bentonite; Clay; Interlayers; Montmorillonite; Roasting; Specific surface; Studies; Surface area; Surface chemistry; Thermal stability; 合成工艺; 吸附能力; 热稳定性; synthesis; charac terization; ad-sorption; pillaring solution; Al-Cr-pillared montmorillonite
• ISSN: 1000-2413; 1993-0437
• DOI: 10.1007/bf02838363

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 m^2 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.