Application of linear free energy relationships to characterizing the sorptive characteristics of organic contaminants on organoclays from water
| Autor: | Jianxi Zhu, Hongping He, Runliang Zhu, Wangxiang Chen, Fei Ge, Yun Liu |
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| Rok vydání: | 2011 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis Water Purification symbols.namesake chemistry.chemical_compound Adsorption Environmental Chemistry Organoclay Organic matter Taft equation Organic Chemicals Waste Management and Disposal chemistry.chemical_classification Cetrimonium Sorption Pollution Montmorillonite Chemical engineering chemistry Environmental chemistry symbols Bentonite Cetrimonium Compounds Water treatment van der Waals force Water Pollutants Chemical |
| Zdroj: | Journal of hazardous materials. |
| ISSN: | 1873-3336 |
| Popis: | Linear free energy relationships (LFERs) were applied to investigate the sorptive characteristics of organic contaminants (OCs) on organoclays from water. Three cetyltrimethylammonium modified montmorillonites (C-Mts) were selected as representative organoclays. The sorption coefficients (logK(oc)) of OCs on the C-Mts were calculated according to the results of batch sorption experiments. Then the LFER equations for OC sorption on C-Mts from water were developed. The results of this study showed that compared with bulk water, water saturated C-Mts are more polarizable, less polar and cohesive, and have stronger H-bond acceptor capacities and weaker H-bond donor capacities. The primary driving forces for the sorption of OCs from water to C-Mts can be ascribed to the weaker cohesive characteristics of C-Mts as well as the stronger nonspecific Van der Waals interaction between OCs and C-Mts. With increasing CTMA loading amount, the interaction between OCs and C-Mts increases whereas the C-Mts become more cohesive. Consequently, the sorption capacity of C-Mts first increases with CTMA loading amount and then decreases with further increased loading amount. |
| Databáze: | OpenAIRE |
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