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镉溶液污染黏土微观结构演化规律

Keywords: 污染黏土,微观结构,孔隙,比表面积

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Abstract:

镉溶液在压实黏土中迁移会引起黏土微观结构的变化。通过一系列扫描电子显微镜与低温氮吸附实验,观察了镉溶液污染黏土的表面微观形貌与孔隙结构的演化规律。扫描电子显微镜观察结果显示,受镉溶液污染严重的土柱上表面孔隙明显,土颗粒之间主要以点-点排列方式为主;而受镉溶液污染较弱的下表面,土颗粒之间主要以片-片状排列为主。低温氮吸附实验结果表明,Z=0cm、Z=10cm、Z=20cm、Z=30cm处,污染黏土吸附量分别为682.65、631.72、583.25和523.36cm3/g。随土柱中土层深度的增大,黏土颗粒间微孔增多,二次孔减少,孔隙体积与比表面积减小。镉溶液污染黏土孔隙主要集中在10nm以下。

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