离子偶极法提纯改性蒙脱土

Purification and Modification of Montmorillonite by Adsorption through Ion-Dipole and Hydrogen-Bonding Interaction

用离子偶极法对膨润土进行处理后 ,其膨胀容与阳离子交换容量均有提高 ,表明蒙脱石含量提高 ,提纯及钠化改性有效 ;XRD、IR谱图及TG曲线同时也表明 ,实现了膨润土的有机化改性 ,蒙脱石d0 0 1 面层间距增大。进一步用季铵盐对提纯改性后的膨润土进行有机化改性 ,XRD表征表明 ,蒙脱石d0 0 1 面层间距继续变大 ,说明经离子偶极法提纯改性后不会影响对蒙脱石表面的进一步修饰改性 ;TG曲线和IR谱图表明处理后的膨润土吸水性下降。基于实验过程现象 ,对离子偶极法的改性机理进行了初步探讨 。

Bentonite was modified by ion-dipole and hydrogen-bonding interactions, resulting in increase in expansion capacity and cation exchange capacity, indicating an increase in the content of montmorillonite(MMT) component and the effectiveness of the purification process and the modification with sodium XRD, IR spectra and TG curves also indicated the realization of organic modification of montmorillonite with increase in the d 001 interlayer distance Then the product was further organically modified with quaternary ammonia salts The XRD results showed that the interlayer distance of MMT continued to increase inferring that the first modification didn't affect the second one The TG and IR spectrum and the XRD results showed the hygroscopicity of the organics intercalated MMT decreased Reaction mechanism study was revealed this as a phase transfer reaction