SITE ENERGY-DISTRIBUTION ANALYSIS OF PRELOADED ADSORBENTS
SITE ENERGY-DISTRIBUTION ANALYSIS OF PRELOADED ADSORBENTS
复制标题
DOI：
10.1021/es00007a013
复制
发表时间：
1995-07-01
影响因子：
11.4
通讯作者：
WEBER, WJ
中科院分区：
文献类型：
--
作者：
CARTER, MC;KILDUFF, JE;WEBER, WJ
提出了一种方法，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吸附（预加载）引起的该吸附剂的位点能量分布的变化联系起来。使用非均相表面理论开发了通常用于描述水溶液中有机溶质吸附的三种等温线模型的近似位点能量分布。事实证明，无论假设的初始位点能量分布类型如何，不可解吸溶质的预加载都会导致表面异质性的损失。损失优先发生在具有最高能量的位点上，在某些情况下，最低能量范围内的位点数量实际上会增加。活性炭用于演示该方法，但该方法通常适用于天然和工程系统中的其他异质吸附剂。
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 surf:aces. 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.