An Eco-sustainable Green Approach for Biosorption of Methylene Blue Dye from Textile Industry Wastewater by Sugarcane Bagasse, Peanut Hull, and Orange Peel: A Comparative Study Through Response Surface Methodology, Isotherms, Kinetic, and Thermodynamics

The present work focuses on the feasibility of elimination of Methylene Blue dye from the textile wastewater with the use of economical organic biosorbents like Sugarcane Bagasse (SCB), Peanut Hull (PHB) and Orange peel (OPB). Batch adsorption tests were performed based on pH, temperature, contact time, initial adsorbate concentration, and dose of biosorbents as independent variables by employing a central composite design (CCD) approach of response surface methodology (RSM). After 90 min of contact time, the dye adsorption equilibrium was reached. It was explained with the help of Langmuir and Freundlich adsorption isotherms for the full concentration ranges of 20-100 mg/L. RSM combined with CCD is used to optimize the experiments for achieving the optimum conditions for the removal of dye. The adsorption data are used for the kinetic modeling from the pseudo-first- and pseudo-second-order kinetic equations. Thermodynamic parameters such as changes in entropy ( increment S), enthalpy ( increment H), and free energy ( increment G) were investigated, also showed that the adsorption was natural and endothermic by removing the randomness of color at the solid and liquid interface. Biosorbent characterization was additionally performed by Fourier-transform infrared spectroscopy (FTIR) to study the adsorption of Methylene Blue before and after the tests. The dimensionless separation factor (RL) and expected results illustrated that SCB, PHB, and OCB could be used to substitute commercially available biosorbents for aqueous solutions and eliminate Methylene Blue dye from textile wastewater.

Automated summary

This study investigates the feasibility of using economical organic biosorbents (such as sugarcane bagasse, peanut hull, and orange peel) for the elimination of methylene blue dye from textile wastewater. The results show that under suitable conditions, these biosorbents can effectively remove the dye from the wastewater.