不同酸处理对凹凸棒石粘土理化性能的影响

摘要

在固液比1:10时,将凹凸棒石粘土分别采用1% HCl、H2SO4、H3PO4、CH3COOH、HClO4和H4P2O7溶液进行处理,通过红外光谱、凹凸棒石粘土成分、比表面积、稳态剪切流变和脱色力性能的测定,考察了不同类型酸处理对凹凸棒石粘土结构和性能的影响.结果表明:与凹凸棒石粘土原土相比,经酸处理后可溶出凹凸棒石粘土中的Na+、Mg(2+)和Ca(2+)离子;HCl、CH3COOH、H3PO4和HClO4液处理的凹凸棒石粘土比表面积和孔体积减小,但平均孔径增大;经酸处理后凹凸棒石粘土剪切粘度降低;用H2SO4处理的凹凸棒石粘土表现出最好的脱色性能.%A series of attapulgite samples were prepared by acid activation with 1％ HCl, H2SO4, H3PO4, CH3COOH, HClO4 and H4P2O7 solutions at solid to liquid ratio of 1:10. The effects of different acids on structure and properties of attapulgite were investigated using infrared spectroscopy (IR), the chemical composition analysis, nitrogen adsorption-desorption(BET), steady shear flow and bleaching experiments. The results showed that acid treatment leads to the removal of the Na+、 Mg2+ and Ca2+ cations. The specific surface area, pore volume of attapulgite samples decreased after treatment with HC1, CH3COOH, H3PO4 and HClO4 solutions and the mean pore size increased. The shear viscosity of attapulgite suspension decreased after acid activation. Attapulgite activated with 1 ％ H2SO4 give the highest bleaching capacity for colza oil.