NC State
Nnaji, C. C., and Emefu, S. C. (2017). "Effect of particle size on the sorption of lead from water by different species of sawdust: Equilibrium and kinetic study," BioRes. 12(2), 4123-4145.


Both the effect of particle size and initial concentration on the adsorption of lead by sawdust of two timber species were investigated using batch experimental equilibrium and kinetic studies. A 100% lead removal efficiency was recorded for the optimum particle size of 1.18 mm for Pycnanthus angolensis and 0.85 mm for Khaya ivorensis at an initial lead concentration of 10 mg/L. Freundlich isotherm (0.83 ≤ R2 ≤ 0.96 for Khaya ivorensis and 0.94 ≤ R2 ≤ 1.0 for Pycnanthus angolensis) performed better than Langmuir and Temkin isotherms. The Dubinin-Radushkevich isotherm was used to ascertain the sorption mechanism. Mean sorption energy (12.48 kJ/mol for Pycnanthus angolensis and 13.42 kJ/mol for Khaya ivorensis) indicated that adsorption was by ion exchange. The pseudo-first order kinetic model (0.96 ≤ R2 ≤ 1.0 for Khaya ivorensis and 0.90 ≤ R2 ≤ 1.0 Pycnanthus angolensis) performed better than others with respect to R2 values, while the intraparticle diffusion model performed better than the other kinetic models with respect to absolute mean error (AME).

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