|
|||||
|
|
A sorbent concentration-dependent Freundlich isotherm |
|
| Authors: | Ling-Xi Zhao Shu-E Song Na Du Wan-Guo Hou |
| Institution: | 1. Environment Research Institute, Shandong University, Jinan, 250100, People’s Republic of China 2. Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan, 250100, People’s Republic of China 3. State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, People’s Republic of China |
| Abstract: | During study of the adsorption isotherms at solid–liquid interfaces, a sorbent concentration effect (C s-effect) phenomenon was observed. In order to describe the C s-effect, we proposed a new adsorption model, i.e., surface component activity (SCA) model. It supposes that the interaction between the sorbent particles exists in the real adsorption system, which induces the deviation of a real adsorption system from an ideal one. It is the deviation that induces the emerging of the C s-effect. Based on the SCA model, the activity coefficient of adsorption sites should be a function of the sorbent concentration (C s), and a C s-dependent Freundlich equation (Freundlich-SCA equation) was derived. It was confirmed that the Freundlich-SCA equation can describe the C s-effect observed in adsorption experiments. Its parameters (n S and K S) can be simulated with experimental adsorption data and are independent of C s. Thus, these parameters obtained at given C s values can be used to predict the adsorption behavior of the adsorbate at any C s value. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |