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Site Energy Distribution Analysis of Preloaded Adsorbents

机译:预载吸附剂的现场能量分布分析

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摘要

A methodology relating changes in the isotherm parameters for sorption of one solute by a heterogeneous sorbent to changes in the site energy distributions of that sorbent caused by prior irreversible sorption (preloading) of other solutes is proposed. Approximate site energy distributions underlying three isotherm models commonly used to describe sorption of organic solutes from aqueous solutions are developed using the theory of heterogeneous surfaces. It is demonstrated that, regardless of the type of initial site energy distribution assumed, preloading by a non-desorbable solute results in a loss of surface heterogeneity. The loss occurs preferentially across sites having the highest energies, with the number of sites in the lowest energy ranges actually increasing in some cases. Activated carbon is used to demonstrate the methodology, but the approach is generally applicable to other heterogeneous adsorbents in both natural and engineered systems.
机译:提出了一种将异质吸附剂吸附一种溶质的等温线参数的变化与其他溶质先前不可逆的吸附(预加载)所导致的该吸附剂的位能分布变化相关的方法。使用非均质表面理论,开发了三种等温线模型下的近似位点能量分布,这些模型通常用于描述从水溶液中吸附有机溶质。结果表明,无论假定初始位置能量分布的类型如何,通过不可吸收的溶质进行预加载都会导致表面异质性的损失。损耗优先发生在具有最高能量的位置上,而在某些情况下,处于最低能量范围内的位置数实际上会增加。活性炭用于证明该方法,但是该方法通常适用于天然和工程系统中的其他非均质吸附剂。

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