Structural and ionization effects on the adsorption behaviors of some anilinic compounds from aqueous solution onto high-area carbon-cloth.
The adsorption of anilinic compounds; aniline, p-toluidine, 1-napthylamine and sodium salt of diphenylamine-4-sulfonic acid from solutions in H2O, in 1 M H2SO4 or in 0.1 M NaOH onto activated carbon-cloth was studied by in situ UV spectroscopy. A specially designed adsorption cell was used for this purpose. The adsorption processes were found to follow first-order kinetics and the rate constants were determined. The pH at the point of zero charge of the carbon-cloth surface was measured as 7.4. The highest rates and extents of adsorption were observed from H2O solutions for aniline, p-toluidine and 1-napthylamine and from solution in 1 M H2SO4 for the sodium salt of diphenylamine-4-sulfonic acid. The adsorption behaviors of these four anilinic compounds in the three solutions (in H2O, in 0.1 M NaOH and in 1 M H2SO4) were explained in terms of electrostatic and dispersion interactions between carbon-cloth surface and the anilinic species. The adsorption isotherm data for the anilinic compounds were derived at 30 degrees C and treated according to Langmuir and Freundlich models. The Freundlich model was found to represent the experimental isotherm data better than Langmuir model.
Duman
Osman
O
Department of Chemistry, Akdeniz University, Antalya, Turkey.
Ayranci
Erol
E
D000327:Adsorption; D000814:Aniline Compounds / Q000737:chemistry* / Q000302:isolation & purification*; D002244:Carbon / Q000737:chemistry*; D007700:Kinetics; D008962:Models, Theoretical; D013057:Spectrum Analysis; D014873:Water Pollutants / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
D000814:Aniline Compounds; D014873:Water Pollutants; D002244:Carbon