Dynamic adsorption of aniline in water on modified sawdust

Sawdust modified by β-cyclodextrin was used as an adsorbent for aniline removal in a fixed bed. The effects of some parameters such as, bed height (10 to 30 mm), feed flow rate (2.7 to 8.1 mL·min^-1), and initial aniline concentration (50 to 200 mg·L^-1) were studied and the corresponding breakthrough curves were obtained. The bed depth service time (BDST) model was applied to simulate the column adsorption data, and the results indicated that the modified sawdust was efficient in aniline adsorption. The increasing filler height resulted in an extension of the breakthrough time and higher removal efficiency, which both decrease with an elevated influent flow rate and initial concentration. The BDST model was suitable for describing the kinetics of fixed-bed adsorption (C_t/C₀=0.7, R²= 0.999 0), and growing running times result in a lower rate constant (K_a) and higher adsorption capacity (N₀). When the influent flow rate is changed, the breakthrough time can also be forecasted by the BDST model.