Micaceous minerals are the natural materials that can block radioactive strontium (Sr) released in the environment, and their adsorption capacity and mechanism are highly divergent owing to the different properties of micas. In this work, we comparatively studied the adsorption of Sr(II) on three typical micas, muscovite, biotite and phlogopite. The effects of pH, contact time, ionic strength, and background electrolyte were evaluated. It was found that phlogopite and muscovite had the largest solid-liquid distribution coefficient (K_d) for a reaction time of 48 h under acidic and alkaline conditions, respectively. Under alkaline conditions, as the reaction time increased to 44 days, phlogopite and muscovite showed the highest and lowest K_d, respectively. The K_d for Sr(II) adsorption on biotite and phlogopite increased with increasing pH but decreased with increasing pH for muscovite. X-ray diffraction analysis revealed that the interlayer weathering of phlogopite (a new diffraction peak appeared at 2-theta of ~6.1°) occurred along with the adsorption of Sr(II) below pH 9.0 under 0.01 mol/L NaCl. Furthermore, the adsorption of Sr(II) was significantly inhibited in the presence of 10⁻⁵ and 10⁻² mol/L Cs⁺, resulting in similar adsorption capacity for phlogopite and muscovite at pH ~4.1. Consequently, the difference in Sr(II) adsorption on muscovite, biotite and phlogopite mainly came from the synergistic process of adsorption and weathering, which induced the differences in availability of interlayer sites among micas over a certain time.

云母类矿物是可以阻挡环境中释放的放射性锶（Sr）的天然材料，由于云母的不同性质，它们的吸附能力和机理差异很大。在这项工作中，我们比较研究了Sr（II）在三种典型的云母，白云母，黑云母和金云母上的吸附。评估了pH，接触时间，离子强度和背景电解质的影响。结果表明，在酸性和碱性条件下，金云母和白云母在48 h的反应时间内具有最大的固液分配系数（K _d）。在碱性条件下，随着反应时间增加到44天，金云母和白云母分别显示出最高和最低的K _d。的Sr（II）在黑云母和金云母上的吸附K _d随pH值的增加而增加，但随pH值的增加而降低。X射线衍射分析表明，在0.01 mol / L NaCl下，金云母的层间风化（在〜6.1°的2θ处出现新的衍射峰）与pH 9.0以下的Sr（II）的吸附有关。此外，在10 ^-5和10 ^-2  mol / L Cs ⁺的存在下，Sr（II）的吸附被显着抑制。，在pH〜4.1时对金云母和白云母的吸附能力相似。因此，白云母，黑云母和金云母对Sr（II）的吸附差异主要来自吸附和风化的协同作用，从而导致一定时期内云母层间位点有效性的差异。