Thermodynamics of multi-solute adsorption from dilute aqueous solutions

✍ Scribed by L. Jossens; J.M. Prausnitz; W. Fritz; E.U. Schlünder; A.L. Myers

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 787 KB
• Volume: 33
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(78)85015-5

✦ Synopsis

AbstraceExpertrnental adsorption data at 20°C are gven for SIX dilute aqueous bl-solute systems adsorbmg on activated carbon The three-parameter Toth adsorption isotherm gives good representation of the data for aqueous smgle-solute adsorption Using the thermodynamic Ideal-adsorbed-solution method, total and partial adsorptions are calculated for the tu-solute systems, agreement wtth expenmentai data IS good Prechcfion for total adsorption IS wdun about 2-10% and for adsorpt!on of ntdividual components w&m about 3-20% In the prediction calculations only single-solute data are used A new three-p&rameter adsorption Isotherm IS presented This new Isotherm also represents the smgle-solute data well For bi-solute systems where dissoclatlon IS negbglble. calculated mdlvldual adsorptions agree with experiment within 2% Systematic deurations between calculated and observed results may be due to the acldltles of the solutes In the future. adsorptIon experiments should be done under controlled pH conditions IiWRODUCTlON AdsorptIon onto activated carbon provides a possible technique for punficatlon of mdustnal wastewaters Destgn of a large-scale adsorption column requires, m adchtlon to rate data, mformatlon on eqmhbnum properties, commonly called "adsorptIon Isotherms" We are concerned here with the calculation of adsorptum eqmllbna for multi-solute adsorption, that is, for &lute aqueous solutions contammg two (or more) orgamc solutes that adsorb on the carbon surface We requue that eqmhbrmm adsorption data are avadable for each smgle-solute aqueous