Copper and nitrophenol pollutants removal by Na-montmorillonite/alginate microcapsules

Autor: Michel Baudu, Jean-Philippe Basly, Abdellahi Ely, Mohamed Ould Sid’Ahmed Ould Kankou
Přispěvatelé: Groupement de Recherche Eau, Sol, Environnement (GRESE), Université de Limoges (UNILIM)
Jazyk: angličtina
Rok vydání: 2009
Předmět:
Environmental Engineering
Alginates
Health
Toxicology and Mutagenesis
chemistry.chemical_element
Capsules
02 engineering and technology
010501 environmental sciences
Waste Disposal
Fluid
01 natural sciences
Water Purification
Diffusion
Nitrophenols
chemistry.chemical_compound
symbols.namesake
Nitrophenol
Adsorption
Glucuronic Acid
[CHIM.ANAL]Chemical Sciences/Analytical chemistry
Spectroscopy
Fourier Transform Infrared
Environmental Chemistry
Thermal analysis
Waste Management and Disposal
0105 earth and related environmental sciences
Chromatography
Hexuronic Acids
Sodium
Temperature
Langmuir adsorption model
Sorption
[CHIM.MATE]Chemical Sciences/Material chemistry
021001 nanoscience & nanotechnology
Pollution
Copper
Kinetics
Montmorillonite
chemistry
Chemical engineering
13. Climate action
[SDE]Environmental Sciences
Bentonite
symbols
Water treatment
0210 nano-technology
Water Pollutants
Chemical
Zdroj: Journal of Hazardous Materials
Journal of Hazardous Materials, Elsevier, 2009, 171 (1-3), pp.405-9. ⟨10.1016/j.jhazmat.2009.06.015⟩
ISSN: 0304-3894
1873-3336
DOI: 10.1016/j.jhazmat.2009.06.015⟩
Popis: International audience; The use of renewable bioresources allows the development of low cost adsorbents that are versatile. In the present paper, the affinity and the removal capacity of montmorillonite/alginate microcapsules for a hydrophobic organic pollutant (4-nitrophenol) and an inorganic pollutant (copper) were evaluated. The physicochemical processes through sorption and kinetic experiments under different ratios of montmorillonite vs. alginate and initial contaminant concentrations were investigated. The total weight loss and diameter decrease during the drying process were 90-96% and 64%, respectively. A significant decrease in beads diameter, related to water elimination, has been observed during the first 24h. Structural modifications that occur during the drying process were evaluated using thermal analysis. From correlation coefficients, the second-order equation depicts properly the adsorption of copper by the microbeads adsorption capacity increases to saturation with time; 3 and 6h were needed to reach equilibrium on wet and dry mixed microcapsules. The pseudo-second order model properly depicts the adsorption process of 4-NP onto Na-mont and (Na-mont/SA) mixed microcapsules but failed to reproduce the data observed for the alginate beads. Isotherms data were fitted with good correlation using the Langmuir model; alginate and montmorillonite adsorption capacities (q(m)/wet beads) agree with those obtained by various studies.
Databáze: OpenAIRE
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