Abstract This paper examines sorption of Pd(II) onto illite, MX-80 bentonite, and Queenston shale in Na–Ca–Cl solutions of varying ionic strength (IS) from 0.01 to 6.0 mol/L (M) and pHc ranging from 3 to 9 under atmospheric conditions. A 2-site protolysis non-electrostatic surface complexation and cation exchange model was applied to the Pd sorption onto illite and MX-80 using PHREEQC, and the model results were compared to the experimental ones obtained in this work. Surface complexation and cation exchange constants were estimated for both illite and MX-80 through the optimization process to bring the predicted distribution coefficients from the model into alignment with the experimentally derived values. These optimized surface complexation constants were compared to existing linear free energy relationships (LFER).

中文翻译：

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Na-Ca-Cl 溶液中伊利石、MX-80 膨润土和页岩对 Pd 的吸附

摘要 本文研究了在离子强度 (IS) 从 0.01 到 6.0 mol/L (M) 和 pHc 从 3 不等的 Na-Ca-Cl 溶液中，Pd(II) 对伊利石、MX-80 膨润土和昆斯顿页岩的吸附到 9 在大气条件下。使用 PHREEQC 将 2 位点质子分解非静电表面络合和阳离子交换模型应用于伊利石和 MX-80 上的 Pd 吸附，并将模型结果与本工作中获得的实验结果进行比较。通过优化过程估计伊利石和 MX-80 的表面络合和阳离子交换常数，使模型的预测分布系数与实验得出的值保持一致。这些优化的表面络合常数与现有的线性自由能关系 (LFER) 进行了比较。