Synthesis and characterization of Al−Cr-pillared montmorillonite with high thermal stability and adsorption capacity
Synthesis and characterization of Al−Cr-pillared montmorillonite with high thermal stability and adsorption capacity
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DOI：
10.1007/bf02838363
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发表时间：
2004-03-01
影响因子：
1.100
通讯作者：
Yu Yong-fu
中科院分区：
文献类型：
--
作者：
Cao Ming-li;Liu Shi-zhen;Yu Yong-fu
以膨润土和铝铬柱化溶液为原料合成了铝铬柱蒙脱土。材料的基间距和比表面积比未处理粘土显著增加。当Al/Cr摩尔比(R)为0.10时，柱状蒙脱土的d（001）值为1.9194 nm，比表面积为165.7 m <sup> </sup> g <sup>−1</sup>。通过煅烧试验和x射线衍射（XRD）分析确定了材料的热稳定性。在不同R（0.05;0.10;0.15;0.25）下形成的材料在300℃时表现出较高的热稳定性，特别是在初始R=0.10时，材料在500℃下煅烧2 h后，基层间距稳定在1.7313 nm。通过吸附实验研究了材料的吸附行为。结果表明：Al - Cr柱型蒙脱石对Cr <sup bbb6 +</sup>的吸附能力明显强于未处理粘土；
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 <sup>2</sup> g <sup>−1</sup> , 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°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 adsorption experiments. The results show that the Al−Cr-pillared montmorillonites exhibit much stronger adsorption capacity on Cr <sup>6+</sup> in aqueous solution than untreated clays do.