四川三台膨润土的基本物化性能及其对铅、钴的吸附性研究

THE BASIC PHYSICOCHEMICAL PROPERTIES AND THE Pb^(2+),Co^(2+) IONS ADSORPTION CAPABILITY OF CA-BENTONITE IN SANTAI,SICHUAN

对四川三台钙基膨润土的基本物化性能和对Pb2+,Co2+离子的吸附性能作了初步的研究。基本物化性能主要包括化学成分、阳离子交换容量、密度、比表面积、孔径、渗透系数及热稳定性。通过实验得出:1)经过钠化改型并酸化处理后的膨润土的阳离子交换容量(CEC)明显高于未经处理的原土;2)膨润土的最佳酸活化条件为在96℃左右以15%的硫酸活化4小时的性能最佳;3)膨润土土的密度为2.11g/cm3,颗粒密度钠化土为1.996g/cm3,原土为2.079g/cm3;渗透系数为0.013cm/s(20℃);体积平均粒径为30.950μm;比表面积为329.7482m2/g,平均孔径为33.238nm;4)膨润土对对重金属离子的吸附实验,得出膨润土对重金属离子Pb2+的吸附性能优于Co2+,Pb2+和Co2+的吸附比(Rd)分别为167.8ml/g及53.3ml/g;Pb2+和Co2+去除率(r)分别为45.87%和21.20%。

The basic physicochemical properties and the Pb^(2+),Co^(2+) ions adsorption capability of Ca-bentonite at the Santai of Sichuan Province are studied.The basic physicochemical properties include chemical composition, the cationic exchange capacity, density, specific surface area, pore diameter, osmosis coefficient and so on .The optimum acid activation conditions for bentonite is treated with the sulphuric acid(15%)activation for 4 hours at 96℃.According to the adsorption experiments on the heavy metal ions(Pb^(2+),Co^(2+)),bentonite adsorbs the heavy metal ions mostly in 20 minutes and the adsorption of Pb^(2+) ion is better than that of Co^(2+) ion.