Adsorption kinetics and isotherms for the removal of rhodamine B dye and Pb+2 ions from aqueous solutions by a hybrid ion-exchanger

• Main Authors: Saruchi, Vaneet Kumar
• Format: Article
• Language: English
• Published: Elsevier 2019-03-01
• Series: Arabian Journal of Chemistry
• Online Access: http://www.sciencedirect.com/science/article/pii/S1878535216302180

The capacity of synthesized hybrid ion exchanger was found for removal of rhodamine B dye and Pb+2 ions from aqueous solution. The effect of different reaction conditions such as sample dosage, pH, ionic strength, contact time and concentration on removal of rhodamine B dye and lead ions was studied. Experimental results of pH and ionic strength showed that hydrophobic-hydrophobic interactions might be the dominant force of attraction for the rhodamine B and lead ions onto synthesized hybrid exchanger system. Adsorption equilibrium isotherms were analyzed by Langmuir, Freundlich, Dubinin-Radushkevich, Tempkin and Redlich-Peterson and Sips models. Langmuir model was found to show the best fit for experimental data and the maximum adsorption capacity was found to be 82.3 and 182.7 mg g−1 for lead ions and 76.4 and 156.8 mg g−1 for rhodamine B at 20 and 50 °C, respectively. The experimental kinetic of the data was analyzed using pseudo-first-order, pseudo-second-order and Weber-Morris intra-particle kinetic models and the results showed that pseudo-second-order kinetic model described the ion exchange kinetics accurately for rhodamine B and lead ions. Thermodynamic activation parameters such as ΔG∗, ΔS∗ and ΔH∗ were also calculated. Keywords: Rhodamine B, Dye, Lead ion, Adsorption, Hybrid ion exchanger