Study of the adsorption of nickel ions on the sea shells of Mehdia: Kinetic and thermodynamic study and mathematical modelling of experimental data
| Autor: | Omar Dagdag, Jaouad Bensalah, H. Es-sahbany, Mohamed Allaoui, Mohamed Berradi, Said Ibn Ahmed |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Langmuir
020209 energy Thermodynamics chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Endothermic process Isothermal process Metal Nickel Adsorption chemistry Physisorption visual_art 0202 electrical engineering electronic engineering information engineering visual_art.visual_art_medium Freundlich equation 0210 nano-technology |
| Zdroj: | Materials Today: Proceedings. 45:7494-7500 |
| ISSN: | 2214-7853 |
| Popis: | In order to optimize and reduce the rate of inorganic micropollutants discharged by various metal facilities, according to wastewater treatment standards and environmental protection, we have proceeded by studying the adsorption of heavy metals such as nickel using sea shells-Mehdia-Morocco as a natural adsorbent. After the preparation of the support, we are interested in the analysis of the physico-chemical parameters influencing the removal of heavy metals such as the kinetics (6.5 to 50 mg.L-1), the initial concentration of the nickel solutions (10 mg.L-1) and the pH of the solution (5.5 to 9.5). All the results obtained show that the adsorption process is favourable to physisorption and monolayer. First, the adsorption amount was found to be 4.05 mg.g−1. Among others, the adsorption process is expressed by the second order kinetic law (R2 = 0.999, 1 / n = 0.37). Moreover, the thermodynamic parameters after using Van't Hoff's equation showed that the studied process has an endothermic, stable and spontaneous effect (ΔG ° = −0.37 Kj.mol−1, ΔH° = 47.31 Kj.mol−1 et ΔS° = 150.56 J.mol−1). Finally, the linear isothermal models of Langmuir (R2 = 0.925), Freundlich (R2 > 0.96) and Temkin (R2 = 0.891), show that the binding and elimination of nickel by this shell is rapid with the increase of the above-mentioned parameters. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect