Adsorption kinetic, equilibrium and thermodynamic studies for the removal of Acid Blue 25 from wastewater by using modified sugarcane bagasse

In this work, batch adsorption of Acid Blue 25 from wastewater onto sugarcane bagasse (SCB) at room temperate was illustrated. The SCB was characterized in term of morphology, Fourier-transform infrared spectroscopy and X-ray diffraction tests. The percentage removal of Acid Blue 25 was increased with contact time, adsorbent (SCB) mass, and temperature while declined with initial concentration of dye in solution and pH. Experimental data of Acid Blue 25 adsorption was subjected to linear and non-linear pseudo-first-order and pseudo-second-order kinetic models. Results showed that Acid Blue 25 adsorption onto SCB from wastewater fitted to linear and non-lin -ear pseudo-second-order model. Two, three and four parameters non-linear adsorption isotherms models were used to demonstrate adsorption of Acid Blue 25 onto SCB. Attained results showed that adsorption of Acid Blue 25 followed non-linear Langmuir isotherm model. Results of adsorp-tion thermodynamics study represented that adsorption of Acid Blue 25 from wastewater onto SCB was an endothermic because the value of change in enthalpy was positive (Delta H degrees = 7.455 kJ/mol). In addition, adsorption of Acid Blue 25 onto SCB was feasible and spontaneous process. In addition, the regeneration of adsorbent is also reported.