Keywords: FSDM, film-solid diffusion model, metal ions, adsorbent mass, kinetics, external mass transfer, diffusivity, modelling, batch adsorption, sago waste, lead ions, copper ions, zinc ions, solid diffusivity values
Modelling of batch adsorption of metal ions onto sago waste
Adsorption kinetics of lead, copper and zinc ions onto sago waste were investigated in batch system. A two-resistance mass transfer model, namely the Film-Solid Diffusion Model (FSDM) which consisted of an external resistance and intra-particle resistance was applied to describe the experimental data successfully. The external mass transfer coefficient (kƒ) values were 1.85 ×10−2 ± 4.74% cm/s for Pb/sago waste system, 9.06 × 10−3 ± 4.14% cm/s for Cu/sago waste, and 6.08 × 10−3 ± 2.43% cm/s for Zn/sago waste system. Solid diffusivity values (Ds) were found to increase with increasing initial metal concentration and decreasing adsorbent mass.