泥炭对铀的吸附动力学研究

摘要

采用静态吸附法研究铀酰离子在泥炭上的吸附动力学特征,利用元素分析、红外光谱、比表面积测试以及电子探针扫描对泥炭样品进行表征.研究不同pH和不同初始铀酰质量浓度的条件下,铀酰离子在泥炭上的吸附动力学行为.结果表明:假二级反应动力学模型能够很好地描述铀酰离子在泥炭上的吸附动力学行为,pH越大,初始吸附速率越大,平衡吸附量越大;假二级吸附速率常数随着铀酰离子初始浓度的增大而减小.%A method of static adsorption was used to study the characteristics of adsorption-kinetics of uranyl ion on peat. The peat was separately characterized by means of element analysis, infrared spectrum, specific surface area measurement and electron probe microanalysis. Attentions were focused mainly on studying the adsorption-kinetics of uranyl ion on peat under different pH values and initial uranyl ion concentrations. Research results show that pseudo-second-order model can completely describe adsorption-kinetics of uranyl ion on peat. The higher the pH value is, the higher the adsorption rate of initial concentration is. It is the same to equilibrium adsorption. Adsorption rate constant of pseudo-second-order model decreases with the increase of initial concentration.