REMOVAL OF METHYL ORANGE DYE FROM AQUEOUS SOLUTION USING GROUNDNUT (Arachis hypogaea) SHELL AS ADSORBENT
Keywords:
Groundnut shell, Methylorange dye, ThermodynamicsAbstract
This work was conducted to determine the ability and effectiveness of groundnut shell to remove methyl orange dye from aqueous solution. The biomass (groundnut shell) was characterized for some physico-chemical properties, before it was used for adsorption studies. The results obtained indicated that the biomass has a positive surface charge with pH of 6.80 at point of zero charge. The results from fourier transform infra- red spectroscopy (FTIR) revealed that the biomass (GS) contain O- H, C-H, C-O, CH2, C-O-C and C=O functional groups. The results from proximate analysis of the biomass showed that the groundnut shell has high content of fibre
(cellulose, hemicellulose and lignin) as well as low moisture content. The GSA, was further used for the removal of methyl orange dye from aqueous under the influence of some adsorption variables. Data obtained revealed that increase in the Initial dye concentrations, increased the methyl orange removal efficiency. The optimum percentage color removal efficiency was obtained as 72% at 100gldm 3 of the initial dye concentration. However increase in PH increased color (methyl orange) removal efficiency. At pH 2-6, 3.653-6.738 mg/g of methyl orange was removed. The process was favoured by increase in adsorbent dosage evident to the (45.3 - 69.5%) of color
removal efficiency when the adsorbent was varied (0.2g – 11.0g). Similarly, variations in temperature enhanced color removal. Optimum temperature for color removal was obtained at 50OC with 69.6% color removal efficiency. Contact time (20 – 100) mins variations revealed 46.1 – 64.8% color removal efficiency. The experimental data were further subjected to some adsorption kinetics and isotherms to understand the mechanism of the process. The process was found to follow the Pseudo-second order kinetic model with a correlation coefficient of 0.9887 and K 2 of 0.0358 g/mg-1. Also the Langmuir adsorption isotherm was better suited to describe
the adsorption mechanism with a correlation coefficient of 0.9763, K L of 0.051 and qmof 2.96 mg/g. The free energy change ΔG from the thermodynamic studies revealed that the process is feasible and spontaneous, negative value of enthalpy change (ΔH) indicates an exothermic adsorption process and the positive and large value of entropy change (ΔS) reflects a high rate of disorderliness. The groundnut shell is a good adsorbent for the removal of methyl orange dye from aqueous solution.
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