Abstract The present study describes the calcium adsorption behavior of clays exhibiting distinct mineralogical composition. The adsorption characteristics were determined using conventional batch-equilibrium sorption method, and different theoretical models were applied to describe the equilibrium sorption isotherms. The variation in calcium adsorption capacity was determined as a function of clay mineralogy, temperature and pore fluid chemistry. Further, the thermodynamic parameters were also calculated to describe the nature of adsorption mechanisms. Significant variation in calcium adsorption potential was observed among the clays, primarily attributed to their mineralogical diversities and related unique surface charge properties. The adsorption density escalated with rise in calcium concentration, temperature and pH of the adsorption system. These observations can be attributed to surface charge modifications and mineral dissolution properties of the clays, which in turn resulted in higher electro-negativity of the clay surface and thereby enhancing the affinity for calcium ions.

中文翻译：

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粘土上的钙吸附：矿物学、孔隙流体化学和温度的影响

摘要 本研究描述了具有不同矿物组成的粘土的钙吸附行为。吸附特性是使用传统的批量平衡吸附方法确定的，并应用不同的理论模型来描述平衡吸附等温线。钙吸附能力的变化被确定为粘土矿物学、温度和孔隙流体化学的函数。此外，还计算了热力学参数以描述吸附机制的性质。在粘土中观察到钙吸附潜力的显着变化，主要归因于它们的矿物多样性和相关的独特表面电荷特性。吸附密度随着吸附系统钙浓度、温度和pH值的升高而升高。