A desorption study was also performed to determine the possibility of adsorbent regeneration.įigure 6 illustrates the variation of adsorption capacity with the contact time at different adsorbent doses. The contact time was the factor with the highest influence on the process, while the temperature had the lowest influence. The Taguchi method and the ANOVA analysis were used to optimize the adsorption conditions. The maximum adsorption capacity was 244.6 (mg g −1) higher compared to other adsorbents based on plant leaves. Equilibrium, kinetic, and thermodynamic studies have shown that the adsorption is best described by the Sips isotherm and pseudo-second-order kinetic model and that the process is spontaneous, favorable, and endothermic, involving physisorption as the main mechanism. The effects of pH, ionic strength, contact time, adsorbent dose, initial deconcentration, and temperature on adsorption capacity were investigated.
Different techniques (FTIR, SEM, color analysis, and pH PZC determination) were applied for adsorbent characterization. In this work, raspberry ( Rubus idaeus) leaves were converted to powder and used as a new natural lignocellulosic low-cost adsorbent for methylene blue removal from aqueous solutions.
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