Novel tannin-based adsorbent in removing cationic dye (Methylene Blue) from aqueous solution. Kinetics and equilibrium studies

• Published in: Journal of hazardous materials Vol. 174; no. 1; pp. 9 - 16
• Main Authors: Sánchez-Martín, J., González-Velasco, M., Beltrán-Heredia, J., Gragera-Carvajal, J., Salguero-Fernández, J.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.02.2010; Elsevier
• Subjects: Adsorption; Applied sciences; Chemical engineering; Dye removal; Exact sciences and technology; Gelification; Hydrogen-Ion Concentration; Kinetics; Methylene Blue; Methylene Blue - chemistry; Models, Theoretical; Natural adsorbents; Pollution; Quebracho; Solutions; Tannin; Tannins - chemistry; Temperature; Water; Methylene Blue; Tannin; Dye removal; Natural adsorbents; Quebracho; Gelification; Discoloration; Dyes; Bark; Extract; Modeling; Adsorption; pH; Physicochemical purification; Kinetics; Aqueous solution; Thermodynamic properties; Activation energy
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2009.09.008

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 l 1 , k l 2 and activation energies were calculated.