Removal and recovery of methylene blue dye from aqueous solution using avena fatua seed husk

الملخص EN

In present investigation, removal mechanism of methylene blue (MB) dye from aqueous solution by using Avena fatua seed husk was investigated at 308K by batch method.

Effect of float/dry time, contact time, adsorbent dose, MB initial concentration, pH and temperature was achieved to get the adsorption optimum condition.

Equilibrium data were tested by Langmuir and Freundlich isotherms and the data fitting well with Freundlich model .

Kinetic data analysis by pseudo-first order, pseudo-second order and intraparticle diffusion model and the result shows better fit with pseudo-second order.

Arrhenius equation at 298, 308, 318 and 328K was used to get the activation energy and found to be 23.57kJ.

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The thermodynamic values of standard free energy, enthalpy and entropy show negative sign exhibit spontaneous, exothermic and decrease the randomness respectively.

The pH at point of zero charge, specific surface area and FTIR spectra was measured for adsorbent and the desorption process which achieved to regenerate the adsorbent after adsorption process.