Removal of mercury ions by Salsola Vermiculata-based activated carbon

International audienc

The use of wood-based activated carbon for organic pollutants removal.

International audienc

Lead Biosorption Using a Dairy Sludge-Thermodynamic Study and Competition Effects

International audienceLocal diary sludge as a biosorbent was used in this study for lead ion adsorption from aqueous solution. Batch experiments were carried out as a function of temperature, initial concentration, and ionic strength. Lead uptake was significantly enhanced from 149 to 224 mg/g of dairy sludge by a temperature increase at pH 5. Equilibrium data for metal ion adsorption were analyzed using model equations, namely Langmuir and Freundlich isotherms, and the best fit to the experimental data was provided by the first isotherm model. Brunauer-Emett-Teller and Fourier transform infrared analyses were also performed to characterize the biosorbent. Ionic strength using NaCl, NaNO3, and Ca(NO3)(2) did not affect Pb+2 sorption, while there was a 20% decrease using CaCl2. A limited effect of Cd+2 ions present in the binary system on lead sorption was observed. This study shows that this local dairy sludge can be an alternative to the commercially available adsorbents for the removal of heavy metals from liquid effluents

Adsorbents preparation from solid waste and their application to pollutants removal by adsorption: Thermodynamic and Kinetics study.

International audienc

Adsorption of methylene blue onto a new activated carbon prepared from artichoke leaves

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TG3-528F9WW-2&_user=1085808&_coverDate=02%2F26%2F2011&_rdoc=1&_fmt=high&_orig=gateway&_origin=gateway&_sort=d&_docanchor=&view=c&_searchStrId=1680843738&_rerunOrigin=google&_acct=C000047619&_version=1&_urlVersion=0&_userid=1085808&md5=8424a4cadc62c34d7172ff42f6bb2c8e&searchtype=aActivated carbons were prepared by the pyrolysis of artichoke leaves impregnated with phosphoric acid at 500 °C for different impregnation ratios: 100, 200, 300 wt.%. Materials were characterized for their surface chemistry by elemental analysis, “Boehm titrations”, point of zero charge measurements, infrared spectroscopy, as well as for their porous and morphological structure by Scanning Electron Microscopy and nitrogen adsorption at 77 K. The impregnation ratio was found to govern the porous structure of the prepared activated carbons. Low impregnation ratios (~ 100 wt.%) led to essentially microporous and acidic activated carbons whereas high impregnation ratios (> 100 wt.%) gave essentially microporous–mesoporous carbons with specific surface areas as high as 2038 m2·g− 1, pore volume as large as 2.47 cm3·g− 1, and a slightly acidic surface. The prepared activated carbons were studied for their adsorption isotherms of Methylene Blue at pH = 3 and pH = 9. The supermicroporous structure of the material produced at 200 wt.% H3PO4 ratio was found to be appropriate for an efficient adsorption of this dye controlled by dispersive and electrostatic interactions depending on the amount of oxygen at the surface

KINETIC AND THERMODYNAMIC STUDY OF THE ADSORPTION OF MANGANESE (II) ON ACTIVATED CARBON

International audienc

Adsorption of methylene blue onto a new activated carbon prepared from artichoke leaves

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TG3-528F9WW-2&_user=1085808&_coverDate=02%2F26%2F2011&_rdoc=1&_fmt=high&_orig=gateway&_origin=gateway&_sort=d&_docanchor=&view=c&_searchStrId=1680843738&_rerunOrigin=google&_acct=C000047619&_version=1&_urlVersion=0&_userid=1085808&md5=8424a4cadc62c34d7172ff42f6bb2c8e&searchtype=aActivated carbons were prepared by the pyrolysis of artichoke leaves impregnated with phosphoric acid at 500 °C for different impregnation ratios: 100, 200, 300 wt.%. Materials were characterized for their surface chemistry by elemental analysis, “Boehm titrations”, point of zero charge measurements, infrared spectroscopy, as well as for their porous and morphological structure by Scanning Electron Microscopy and nitrogen adsorption at 77 K. The impregnation ratio was found to govern the porous structure of the prepared activated carbons. Low impregnation ratios (~ 100 wt.%) led to essentially microporous and acidic activated carbons whereas high impregnation ratios (> 100 wt.%) gave essentially microporous–mesoporous carbons with specific surface areas as high as 2038 m2·g− 1, pore volume as large as 2.47 cm3·g− 1, and a slightly acidic surface. The prepared activated carbons were studied for their adsorption isotherms of Methylene Blue at pH = 3 and pH = 9. The supermicroporous structure of the material produced at 200 wt.% H3PO4 ratio was found to be appropriate for an efficient adsorption of this dye controlled by dispersive and electrostatic interactions depending on the amount of oxygen at the surface

Characterization of flexible foam modified with activated carbon

National audienc

Modeling of the sorption of crude oil on a polyurethane foam-powdered activated carbon composite

International audienc