Performance of novel biosorbents prepared using native and NaOH treated Peltophorum pterocarpum fruit shells for the removal of malachite green

The Peltophorum pterocarpum fruit shells were treated with sodium hydroxide, employed for the malachite green biosorption. Biosorbents characterization conducted using the Environmental Scanning Electron Microscopy and X-ray Diffractometer. The MG removal performance was evaluated in a batch biosorption system by varying the process parameters. The biosorption data modeled using the Langmuir, Freundlich, Tempkin, Halsey and Jovanovic isotherm models. The Langmuir model superior explained the equilibrium data among the isotherms considered in the current investigation. The maximum uptake capacity of 62.50 mg/g was observed for sodium hydroxide treated biomass, whereas native biosorbent showed 40.00 mg/g. The kinetic modeling of the experimental data revealed that the better fit of the pseudo-second-order kinetic model and suggested the mechanism of chemisorption. MG biosorption using sodium hydroxide treated biomass of enthalpy with positive values indicates endothermic and Gibbs free energy of negative values represented spontaneous nature.