School of Material Science and Engineering, Beihang University, Beijing 100191, China.
J Colloid Interface Sci. 2010 May 15;345(2):154-9. doi: 10.1016/j.jcis.2010.01.054. Epub 2010 Feb 6.
The adsorption of antimony acetate (Sb(OAc)(3)) on sodium montmorillonite (Na-MMT) was studied at five different initial concentrations, and data from the adsorption isotherm were modeled using the Langmuir, Freundlich and D-R isotherm equations. The kinetics of adsorption was also discussed using three kinetic models: the pseudo-first-order, the pseudo-second-order and the intraparticle diffusion model. The rate constants of pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetics, and the amount of Sb(OAc)(3) adsorbed at equilibrium were determined. Moreover, the desorption of Sb(OAc)(3) from several kinds of Sb-MMT (Na-MMT was intercalated by antimony acetate) was investigated at room temperature and 180 °C. The results show that according to the maximum amounts of adsorbate and correlation coefficients calculated from the three isotherm equations mentioned above, the corresponding data from adsorption experiments fit fairly well to the Langmuir isotherm. The adsorption data show a good compliance with the pseudo-second-order kinetic model and also follow the intraparticle diffusion model up to 30 min. The equilibrium adsorption capacity of Sb(OAc)(3) on MMT is close to the cation exchange capacity (CEC) of the montmorillonite. The desorption amount of Sb(OAc)(3) is correlated with both the temperature of desorption and the drying temperature of Sb-MMT.
研究了五组不同初始浓度下的醋酸锑（Sb(OAc)(3)）在钠基蒙脱石（Na-MMT）上的吸附情况，并采用 Langmuir、Freundlich 和 D-R 吸附等温线方程对吸附等温线数据进行了拟合。还使用三种动力学模型（准一级、准二级和内扩散模型）讨论了吸附动力学。确定了准一级、准二级和内扩散动力学的速率常数以及平衡时吸附的 Sb(OAc)(3)量。此外，还研究了在室温及 180°C 下从几种 Sb-MMT（Na-MMT 被醋酸锑插层）中解吸 Sb(OAc)(3)的情况。结果表明，根据上述三个等温线方程计算的吸附剂最大吸附量和相关系数，吸附实验数据与 Langmuir 等温线拟合较好。吸附数据很好地符合准二级动力学模型，并且在 30 分钟内也符合内扩散模型。Sb(OAc)(3)在 MMT 上的平衡吸附容量接近蒙脱石的阳离子交换容量（CEC）。Sb(OAc)(3)的解吸量与解吸温度和 Sb-MMT 的干燥温度均有关。
