Adsorption of As and Pb by Stone Powder/Chitosan/Maghemite Composite Beads (SCM Beads): Kinetics and Column Study

Adsorption kinetics of As and Pb onto composite beads synthesized with stone powder, chitosan, maghemite (SCM beads) weight ratio 1:1:0.5 were investigated in batch mode. Several kinetic models such as pseudo-first order model (PFOKM), pseudo-second (PSOKM), two compartment first (TCFOKM), modified (MTCFOKM) utilized to analyze the kinetics. Although had low specific surface area pore volume, MTCFOKM, one models, could predict most accurately because adsorbed at least kinds adsorption sites functional groups chitosan Fe maghemite. In both fast fraction (f1’) constant (k1’) for higher than those As. Therefore, equilibrium time (teq) was shorter that adsorption, indicating more affinitive SCM (especially maghemite). Column study a bed column reactor packed also conducted. For study, effect flow rate volume on removal efficiency investigated. Three Thomas, Adams-Bohart (A-B), Yoon-Nelson (Y-N) used fit experimental data breakthrough curves saturation time. Both Thomas Y-N appropriate. Conclusively, are suitable treatment from contaminated groundwater particularly effective removal.