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进行了U(VI)在粘土上吸附的批实验 ,其中 ,粘土样采自我国南方某大型铀尾矿库库底。实验结果表明 ,U(VI)在粘土上的吸附与浸泡液的pH值呈强烈的非线性关系 ,在pH值近中性时 ,U(VI)在粘土上的吸附达到了一个最大值 ,而在偏酸性或偏碱性条件下 ,U(VI)在粘土上的吸附迅速减少 ;运用表面络合理论建立了U(VI)在粘土上吸附的表面络合模型(DLM) ,该模型很好地拟合了实验数据。模型检验表明 ,它可以精确预测U(VI)在不同热力学条件下的吸附行为 ;此外 ,模拟结果表明 ,U(VI)的粘土上吸附在酸性条件下受固液比 (M/V)影响明显 ,而在碱性条件下主要受浸泡液中HCO3- 和CO32 - 的控制。
The batch experiment of adsorption of U (VI) on clay was carried out, in which clay samples were collected from the bottom of a large uranium tailings reservoir in South China. The experimental results show that the adsorption of U (VI) on clay is strongly nonlinear with the pH value of the soaking solution. At nearly neutral pH, the adsorption of U (VI) on clay reaches a maximum, and Under acidic or alkaline conditions, the adsorption of U (VI) on clay decreased rapidly. The surface complexation model (DLM) of U (VI) adsorbed on clay was established by surface complexation theory. The model is very good Fitting the experimental data. The model test shows that it can accurately predict the adsorption behavior of U (VI) under different thermodynamic conditions. In addition, the simulation results show that the sorption of clay on U (VI) is obviously affected by the solid / liquid ratio (M / V) , Whereas under alkaline conditions it is mainly controlled by HCO3- and CO32- in the soaking solution.