Pb(II) adsorption by KOH-modified rice straw biochar from battery wastewater
Description
This data is for FTIR spectroscopy, RSM modelling, the influence of factors on adsorption, isotherm, kinetic and thermodynamic modelling, and all tables and figures. FTIR spectra derived from FTIR-RSB (pristine biochar), KRSB (KOH-modified biochar) and KRSB-Pb (modified biochar after Pb adsorption). The FTIR spectra revealed oxygen-containing functional groups (-OH, -COO⁻, C–O–C) that facilitated complexation and precipitation. Five factors (Dose, initial Pb(II) concentration, contact time, temperature, and pH) were used in RSM modeling and optimisation. The resulting model was adequate with high R2 and low p-value. The adsorption followed dual Langmuir-Temkin isotherm models and pseudo-second-order kinetic model. The Pb(II) adsorption was endothermic with negative gibb's free energy.