Novel tannin-based adsorbent in removing cationic dye (Methylene Blue) from aqueous solution. Kinetics and equilibrium studies.
Natural tannin-based adsorbent has been prepared on the basis of the gelification of Quebracho bark extract. The resulting product, Quebracho Tannin Gel (QTG) was tested as cationic dye adsorbent with Methylene Blue (MB). Kinetics of adsorption process were studied out and a period of 15 days was determined for reaching equilibrium. The influences of pH and temperature were evaluated. As pH or temperature raise q capacity of QTG increases. Theoretical modelization of dye-QTG adsorption was carried out by multiparametric adjustment according to Langmuir's hypothesis. Values of the k(l1), k(l2) and activation energies were calculated.
Department of Chemical Engineering and Physical Chemistry, University of Extremadura, Avda de Elvas, s/n, 06071 Badajoz, Spain. jsanmar@unex.es
J
J
Sánchez-Martín
M
M
González-Velasco
J
J
Beltrán-Heredia
J
J
Gragera-Carvajal
J
J
Salguero-Fernández
D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry*; D008962:Models, Theoretical; D012996:Solutions; D013634:Tannins / Q000737:chemistry*; D013696:Temperature; D014867:Water
D012996:Solutions; D013634:Tannins; D014867:Water; D008751:Methylene Blue