Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Abstract

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 ≤ R 2 ≤ 0.96 for Khaya ivorensis and 0.94 ≤ R 2 ≤ 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 ≤ R 2 ≤ 1.0 for Khaya ivorensis and 0.90 ≤ R 2 ≤ 1.0 Pycnanthus angolensis) performed better than others with respect to R 2 values, while the intraparticle diffusion model performed better than the other kinetic models with respect to absolute mean error (AME).

Adsorption Of Cd(II) Ions From Aqueous Solution By A Low-Cost Biosorbent Prepared From Ipomea Pes-Caprae Stem

“…Consequently, the BIPS-A (less than 0.063 mm) had the highest adsorption capacity, the adsorption capacity of BIPS-B was higher than the BIPS-B and BIPS-C, and the BIPSC had the smallest adsorption capacity. This finding was also reinforced by the previous study for lead ion adsorption by sawdust biosorbent in a size range of 1.18-2.36 mm (Nnaji and Emefu, 2017). The adsorption of Cd, Pb, and Cr ions by eucalyptus activate carbon in a size range of 0.063 to 1,2 mm (Gebretsadik et al, 2020) with the maximum adsorption capacity at the size of 0.063 mm, which was the same size as the BIPS-A.…”

Reuse of Sawdust in Developing Countries in the Light of Sustainable Development Goals

“…Adsorption, a Physico-chemical process, has been found to respond markedly to the particle size of the adsorbent. A study of sawdust generated from two commonly wood species (Khaya Ivorensisand Pycanthus Angolensis) showed that optimum adsorption of lead was achieved at respective particle sizes of 0.85 mm and 1.18 mm with 100% efficiency of removal for an initial concentration of 10 mg/l [143]. Freundlich isotherms performed much better than Langmiur, Temkin, and Dubinin-Radushkevich isotherms for Khaya ivorensis and Pycnanthus angiogenesis with R 2 of 0.83 to 0.96 and 0.94 to 1.0 respectively.…”