Adsorptive removal of methylene blue dye by melon husk: Kinetic and isothermal studies. | [Pakistan Journal of Scientific and Industrial Research (Series A: Physical Sciences) • 2013]

Author(s):

1. Abass Abiola Olajire: Industrial and Environmental Chemistry Unit, Department of Pure and Applied Chemistry, Ladoke Akintola University of Technology, Ogbomoso, Nigeria

2. Abdur-Rahim Adebisi Giwa: Industrial and Environmental Chemistry Unit, Department of Pure and Applied Chemistry, Ladoke Akintola University of Technology, Ogbomoso, Nigeria

3. Isa Adewale Bello: Physical Chemistry Unit, Department of Pure and Applied Chemistry, Ladoke Akintola University of Technology, Ogbomoso, Nigeria

Abstract:

The adsorption capacity of methylene blue (MB) dye from aqueous solution onto raw melon husk (RMH) was investigated under various experimental conditions. Surface studies of RMH were investigated by fourier transform infrared (FTIR) and scanning electron microscopy (SEM). Batch studies were performed to evaluate the effect of various experimental parameters such as contact time, initial concentration of MB dye and dosage of RMH on the efficiency of the sorption process. Optimum conditions for MB dye removal were found to be at an adsorbent dosage of 8.0 g/L of solution for an equilibrium time of 120 min. Lagergren, Elovich and Morris – Weber equations were employed to study kinetics of sorption process. The sorption process was very rapid at the initial stage as 80% of the dye was removed within the first 5 mins. The kinetics of the adsorption followed pseudo second order model with R2 values ranging from 0.999 to 1 for all initial dye concentrations studied. Equilibrium isotherms for the adsorption of MB dye on RMH were analysed by Freundlich, Langmuir and Temkin isotherm models and the goodness of fittings were inspected using linear regression analysis (R2) and sum of square error (SSE). The equilibrium data were well described by Langmuir and Temkin equation at all range of operating parameters.

Page(s): 151-164

DOI: DOI not available

Published: Journal: Pakistan Journal of Scientific and Industrial Research (Series A: Physical Sciences), Volume: 56, Issue: 3, Year: 2013

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