Kinetics of liquid phase batch adsorption experiments
Kinetics of liquid phase batch adsorption experiments
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DOI：
10.1007/s10450-020-00258-9
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发表时间：
2020-09-11
影响因子：
3.3
通讯作者：
Brandani, Stefano
中科院分区：
文献类型：
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作者：
Brandani, Stefano
通过将已知量的吸附剂以已知的初始浓度加入到液体溶液中并跟踪吸附物浓度随时间的变化来进行分批吸附实验。这是获得液体系统平衡和动力学信息的一种非常常见的方法，但在大多数情况下，动力学结果是根据经验模型进行分析的。两个唯象模型的基础上大孔扩散珠和收缩核动力学被用来产生的数据，然后解释与广泛使用的unconstrainedlinear回归方法。结果表明，在这两种情况下，R（2）值接近1，导致不正确的解释机制的质量传输。建议应使用现象学模型分析批量吸附实验，以获得适用于其他系统的物理参数，并减少吸附动力学分析所需的实验。
Batch adsorption experiments are carried out by adding a known amount of adsorbent to a liquid solution at a known initial concentration and following the evolution in time of the concentration of the adsorbate. This is a very common method to obtain equilibrium and kinetic information in liquid systems, but in most cases kinetic results are analysed on the basis of empirical models. Two phenomenological models based on macropore diffusion in beads and shrinking core kinetics are used to generate data that are then interpreted with the widely usedunconstrainedlinear regression methods. The results show that for both cases R(2)values close to unity are obtained leading to the incorrect interpretation of the mechanism of mass transport. It is recommended that batch adsorption experiments should be analysed using phenomenological models to obtain physical parameters that are applicable to other systems and to reduce the experiments required to characterise fully the kinetics of adsorption.