Adsorption Mechanisms of Carbofuran on Silica: Structure, Kinetics, and Solubility Influence

Coadsorption of carbofuran and lead at the water/silica interface. Possible impact on environment

“…The adsorption isotherm obtained in this study and displayed on Fig. 3 is consistent with our previous experimental data [7,8]. The finding of a very low adsorption due to the negative Gibbs relative adsorption does not mean that the surface layer is devoid of carbofuran, but indicates that this layer is richer in water than bulk.…”

“…Adsorption of a single solution of carbofuran is rather well-known [6][7][8]. The adsorption isotherm obtained in this study and displayed on Fig.…”

“…A certain quantity of known weight and estimated to be less than the soluble one was, first, mixed with the chosen weight of purified water, then gently agitated in a thermoregulated oven for 15 days, the duration required for a complete dissolution of crystals [7,8]. All the prepared solutions were stored in the dark to prevent carbamate decomposition.…”

“…http://france.elsevier.com/direct/CRAS2C/ C. R. Chimie 9 (2006) [1476][1477][1478][1479][1480][1481] This report deals with the adsorption of carbofuran and lead on a model of soil, namely silica suspension. Indeed, carbofuran adsorption has been extensively studied [6][7][8], but its coadsorption with salts has been considered only at the solution/air interface [2,9]. Thus, besides the layout of ions, our concern, here, will be the very specific behaviour of water.…”

Sorption of Hydrophobic Molecules by Organic/Inorganic Mesostructures

“…Then a saturation plateau is observed for phenol and chlorophenol, whereas paratoluidine and dichlorophenol sorption isotherms show a change of concavity, with a strong increase in sorbed amount for equilibrium concentrations above 20 mmol · L −1 . This strong sorption increase is due to the vicinity of the solubility limit: theory and experiments (20,21) show that close to a bulk phase change, local concentration fluctuations occur, making the nucleation of the new phase possible at the interface before exactly reaching the solubility limit. This phenomenon is not observable for phenol and 3-chlorophenol.…”