Adsorption Performance of Raw Water Lily (Nymphaea lotus) Leaves for Methyl Violet Removal: Kinetics, Isotherms and Thermodynamic Studies
DOI:
https://doi.org/10.56919/usci.2651.036Keywords:
Methyl Violet, Thermodynamics, Adsorption, Kinetics, IsothermsAbstract
The Discharge of methyl violet effluents from textile and other related industries poses serious environmental and health problems due to its toxicity, non-biodegradable and it persistent in water bodies. Adsorption is considered as an effective and economical method for dye removal. However, the development of efficient, low cost and sustainable adsorbents is still a challenge. In this study, raw water lily (Nymphaea lotus) leaves powder was prepared and used as adsorbent for the adsorption of methyl violet (MV) dye from aqueous solution. A Batch adsorption experiment was conducted to investigate the effect of contact time (15-150min), dosage (20-200mg), initial concentration (30-180mg/L) and pH (3-13) respectively. The adsorbent was characterised using scanning electron microscope (SEM) and Fourier transform infrared (FT-IR) spectroscopic methods. Langmuir, Fruendlich, Temkin and DRK isotherm models, as well as pseudo-first order, pseudo-second order, elovich and intraparticles diffusion models were studied and applied. And finally thermodynamic parameters were also evaluated. The results showed that the best adsorption of MV onto RWL was at 90min contact time, 100mg adsorbent dosage, concentration of 90.00mg/L and the pH of 13 were taken as the optimised conditions. The equilibrium data generated shows that Temkin model best fitted/described the adsorption process with regression value (R2 =0.9586) close to unity. The heat of adsorption was estimated from Temkin isotherm model to be 0.240kJ/mol and mean free energy was estimated from Dubinin-Rudushkevich (DRK) model to be 0.121kJ/mol indicating the adsorption process to obey chemisorption mechanism. The kinetic data generated revealed that the adsorption process of MV onto the RWL adsorbent followed pseudo-second-order kinetics, with R2 values of 0.9978. The experimental qe (241.80mg/g) and calculated adsorption capacity qcal (232.56mg/g) were in agreement. The thermodynamics studies conducted revealed that the adsorption was spontaneous and feasible with Gibbs' free energy change (∆G) values ranging from -10.37 to -11.30kJ/mol, exothermic in nature with enthalpy change (ΔH) value of -1.03kJ/mol and entropy change (ΔS) during transfer of molecules between the solid and liquid phase with entropy to be 30.8J/mol. This study reveals the potentials of RWL as a promising adsorbent for the removal of MV dye from aqueous solutions.
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