| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 625103 | Desalination | 2011 | 9 Pages |
The objective of this work was to determine the optimum conditions for adsorption/desorption of reactive dyes, using both batch experiments and fixed bed columns with humin immobilized on silica. Results of batch experiments showed that adsorption of Reactive Orange 16 and Reactive Red 120 by humin was most effective at pH 1.0. Adsorption equilibrium was achieved rapidly for all initial dye concentrations employed. Temperature measurements indicated that the process was exothermic, and described by a pseudo-second order kinetic model for both dyes, while the Freundlich and Langmuir isotherms best described the adsorptions of RO 16 and RR 120, respectively. Column experiments showed adsorption efficiencies of 62.1 to 39.6% and 96.2 to 74.8%, and desorption efficiencies of 81.4 to 51.3% and 66.8 to 36.8% for RO 16 and RR 120, respectively, over three cycles. The biosorbent presents excellent performance in removal of reactive dyes, with the advantage that it can be regenerated and reused.
Research highlights► Humin immobilized on silica is an effective adsorbent of the dyes RO 16 and RR 120. ► Pseudo-second order kinetic models can be used to describe dye adsorption. ► The Freundlich and Langmuir isotherms described adsorption of the dyes. ► Adsorption efficiencies were 62.1–39.6% (RO 16) and 96.2–74.8% (RR 120). ► The technique offers potential for large reductions in waste generation.
