细颗粒泥沙吸附铜离子后表面孔隙变化的实验研究  

Experiments on fine sediment surface porosity changes after copper ion adsorption

作　　者：陈志和[1,2] 方红卫[2] 陈明洪[3] 

机构地区：[1]中山大学水资源与环境系水资源与环境研究中心,广东广州510275 [2]清华大学水利水电工程系水沙科学与水利水电工程国家重点实验室(筹),北京100084 [3]中国农业大学水利与土木工程学院,北京100083

出　　处：《泥沙研究》2010年第1期25-29,共5页Journal of Sediment Research

基　　金：国家重大科技专项"水专项"(2008ZX07209-02);国家青年自然科学基金(50909107)

摘　　要：细颗粒泥沙的表面形貌十分丰富,研究其表面的复杂结构对泥沙的吸附、输移具有重要的理论意义。本文通过镶嵌制样观察泥沙颗粒的孔隙结构,采用物理化学吸附仪对重金属离子吸附后的实验沙进行孔径分布分析与孔隙特征变化研究。结果表明细颗粒泥沙为多孔性固体,微孔与中孔是吸附作用的重要因素。铜离子在吸附量由低到高的过程,首先聚集在孔隙入口处,再逐渐填满孔隙内部空间。伴随这一过程,泥沙的形貌特征也发生了相应的改变。This paper applies electron microscopy analysis and inlay and sample preparation to observe the pore structure of sediment particles.Fine sediment tends to have a very complex surface morphology.The complex surface morphology promises to have a deep theoretical significance for sediment adsorption,transportation and chemical dynamics.The pore diameter distribution and pore characteristics of sample sand after adsorbing heavy metal ions are analyzed using physisorption/chemisorption instruments.The results indicate that fine sediment is a kind of porous solid.Micropores and mesopores are major factors in their adsorption.The ions gather in the pore entrance at the start of the adsorption process.Then the ions move into the inner pores and gradually fill the pore space.The complex surface morphology follows the law of copper ions in the adsorption process.

关 键 词：细颗粒泥沙 孔隙吸附作用 铜离子 

分 类 号：TV141.2[水利工程—水力学及河流动力学]