Removal of the herbicide 2,4-dichlorophenoxyacetate from water to zinc–aluminium–chloride layered double hydroxides
| Autor: | Ahmed Legrouri, Allal Barroug, Mohamed Lakraimi, A. De Roy, Jean-Pierre Besse |
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| Rok vydání: | 2005 |
| Předmět: |
Environmental Engineering
Infrared Rays engineering.material Chloride Water Purification Adsorption Chlorides X-Ray Diffraction Hydroxides medicine Waste Management and Disposal Water Science and Technology Civil and Structural Engineering Chromatography Aqueous solution Ion exchange Herbicides Chemistry Spectrum Analysis Ecological Modeling Layered double hydroxides Sorption Hydrogen-Ion Concentration Pollution Ion Exchange Thermogravimetry Zinc engineering Water treatment 2 4-Dichlorophenoxyacetic Acid Water Pollutants Chemical Aluminum medicine.drug Nuclear chemistry |
| Zdroj: | Water Research. 39:3441-3448 |
| ISSN: | 0043-1354 |
| DOI: | 10.1016/j.watres.2005.03.036 |
| Popis: | Batch sorption studies were conducted to investigate the potential of [Zn–Al–Cl] layered double hydroxides (LDHs) for the removal of the herbicide 2,4-dichlorophenoxyacetate (2,4-D) from contaminated aqueous solutions. Experiments were performed at different pH values, initial pesticide concentration, solid/pesticide ratio and anion exchange capacity of LDHs. The LDH samples evaluated had very high retention capacity for 2,4-D whose removal was a rapid process, as a quasi-equilibrium state was reached after 1-h reaction time. The adsorption can be described by Langmuir-type isotherms, with an average affinity constant of 12.5 L mmol−1. At initial 2,4-D concentrations between 0.08 and 4 mmol L−1, the solids removed up to 98% of the pesticide. Physicochemical characterization of the LDH solids, both fresh and after removal of 2,4-D, by X-ray diffraction, infrared spectroscopy and thermogravimetry, indicates that the retention of 2,4-D is done by adsorption on the surface of the solid for low 2,4-D concentrations. However, a combination of surface adsorption and interlayer ion exchange takes place when the 2,4-D concentration is high. |
| Databáze: | OpenAIRE |
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