6 documents found, page 1 of 1
Separating Surface and Solvent Effects and the Notion of Critical Adsorption En...
Carrott, PJM; Mourão, PAM; Ribeiro Carrott, MML; Gonçalves, EMA modified form of the Freundlich equation in which the solute equilibrium concentration is normalized with respect to the solute solubility is analyzed and applied to adsorption isotherms of phenol, 4-nitrophenol, 4-chlorophenol, and 2-chlorophenol at different values of pH on commercial activated carbon before and after oxidation. The analysis confirms the importance of normalizing the solute equilibrium conc...
Adsorption of Bovine Serum Albumin onto Mesocellular Silica Foams with Differen...
Sezões, F; Ribeiro Carrott, MML; Mourão, PAM; Carrott, PJMAs a model protein with quite large dimensions, Bovine Serum Albumin (BSA) has been used to evaluate the influence of the distinct pore structural characteristics of three mesocellular foam (MCF) materials prepared with or without the addition of ammonium fluoride and with varying 1,3,5-trimethylbenzene/Pluronic P123 (TMB/P123) ratios. SBA-15 was also studied for comparative purposes. Characterisation by X-ray ...
Competitive naphthalene adsorption on activated carbons. Effect of porosity and...
Cabal, B; Ania, CO; Mourão, PAM; Ribeiro Carrott, MML; Carrott, PJM; Parra, JB; Pis, JJThe goal of this work was to investigate the mechanism of competitive adsorption of naphthalene on activated carbons from diluted solutions. The polarity of the adsorption media was varied, by selecting solvents ranging from high to low dielectric constants (ethanol, cyclohexane and heptane). By altering the hydrophobicity of the adsorption media, the preferential adsorption of the organic probe is changed; the...
Application of different equations to adsorption isotherms of phenolic compound...
Mourão, PAM; Carrott, PJM; Ribeiro Carrott, MMLActivated carbons were prepared from solid cork wastes by physical activation with carbon dioxide or steam, and chemical activation by impregnation with phosphoric acid. In this work we show the possibility of using these activated carbons for the adsorption of phenolic compounds from the aqueous phase. The materials present a different response to the adsorptives used (p-nitrophenol, p-chlorophenol, p-cresol a...
Controlling the micropore size of activated carbons for the treatment of fuels ...
Carrott, PJM; Mourão, PAM; Ribeiro Carrott, MMLExclusively microporous activated carbons have been prepared from cork by physical and chemical activation under different conditions. The results show that it is possible to control the pore size of the activated carbons and to obtain materials with narrow micropore size ( 0.69 nm) and high micropore volume ( 0.64 cm3 g 1) equal to or better than the best activated carbon fibres. Higher micropore volumes are g...
Pore size control in activated carbons obtained by pyrolysis under different co...
Carrott, PJM; Ribeiro Carrott, MML; Mourão, PAMActivated carbons were prepared by the pyrolysis of cork impregnated with potassium and sodium hydroxides and carbonates as well as phosphoric acid and the effect of five experimental parameters, namely method of impregnation, impregnant concentration, mass ratio, precursor particle size and pyrolysis temperature, were studied. It is shown that cork is a versatile precursor and allows us to prepare a wide varie...