Equilibrium, kinetic and thermodynamic study of cesium adsorption onto nanocrystalline mordenite from high-salt solution
| Autor: | Eil-Hee Lee, Dong-Yong Chung, Keun-Young Lee, Jimin Kim, Kwang-Wook Kim, Maeng-Kyo Oh, Minsung Park, Jei-Kwon Moon |
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| Rok vydání: | 2016 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis Inorganic chemistry Cesium 02 engineering and technology Sodium Chloride 010501 environmental sciences 01 natural sciences Chemical reaction Mordenite symbols.namesake Adsorption Reaction rate constant Monolayer Nano Environmental Chemistry 0105 earth and related environmental sciences Chemistry Public Health Environmental and Occupational Health Langmuir adsorption model General Medicine General Chemistry 021001 nanoscience & nanotechnology Pollution Solutions Kinetics symbols Thermodynamics Aluminum Silicates 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Chemosphere. 150:765-771 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2015.11.072 |
| Popis: | In this study, the equilibrium, kinetics and thermodynamics of cesium adsorption by nanocrystalline mordenite were investigated under cesium contamination with high-salt solution, simulating the case of an operation and decommissioning of nuclear facilities or an accident during the processes. The adsorption rate constants were determined using a pseudo second-order kinetic model. The kinetic results strongly demonstrated that the cesium adsorption rate of nano mordenite is extremely fast, even in a high-salt solution, and much faster than that of micro mordenite. In the equilibrium study, the Langmuir isotherm model fit the cesium adsorption data of nano mordenite better than the Freundlich model, which suggests that cesium adsorption onto nano mordenite is a monolayer homogeneous adsorption process. The obtained thermodynamic parameters indicated that the adsorption involved a very stable chemical reaction. In particular, the combination of rapid particle dispersion and rapid cesium adsorption of the nano mordenite in the solution resulted in a rapid and effective process for cesium removal without stirring, which may offer great advantages for low energy consumption and simple operation. |
| Databáze: | OpenAIRE |
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