Removal of Methylene Blue from Aqueous Solution Using Typha Stems and Leaves

Raymundo Sánchez Orozco, Miriam Martínez-Juan, José Juan García-Sánchez, Fernando Ureña-Núñez

Abstract


The aim of this study was to investigate the potential of Typha latifolia L. stem and leaf powder (T-SLP) to remove methylene blue (MB), a cationic dye, from aqueous solutions. The T-SLP was used without any modification. The batch adsorption experiments were carried out at 25 °C under varying operating parameters, namely pH, initial concentration, contact time, and adsorbent dose. Equilibrium isotherms and kinetics were used for data analysis. The surface morphology of the adsorbent and the possible interactions between the T-SLP and MB were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR), respectively. The experimental data fitted well to the Langmuir model, with a maximum adsorption capacity of 126.6 mg g-1. The efficiency of dye removal in the substrate was high, reaching a maximum value of 98.69%. Intra-particle diffusion was involved in the adsorption process, and the pseudo-second-order kinetics was the best fit for the adsorption of MB onto T-SLP, with a high correlation (R2 ≥ 0.9993) for all initial MB concentrations studied. The results of this work revealed that T-SLP can be used as a potential alternative for the rapid removal of MB from aqueous solutions.

Keywords


Typha latifolia; Methylene blue; Equilibrium; Adsorption isotherms; Kinetics

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