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In this work, dried leaves of Typha angustifolia (TA), also known as the  common cattail, were used as an adsorbent in kinetic studies of Pb(II)  adsorption from synthetic aqueous solutions. Batch adsorption studies with  dried TA leaves were conducted and they were able to adsorb Pb(II) from 100  mL of a 25 mg L-1 Pb(II) solution effectively with the optimized dosage of  0.6 g. Adsorption equilibrium was achieved within 8 hours with an effective  removal percentage of 86.04 %. Adsorption kinetics was further evaluated  using four kinetic models, i.e., the pseudofirst order, pseudo-second order,  intraparticle diffusion and Elovich model. Fitting of the data was performed  based on linear regression analysis. The sorption kinetic data fitted best to  the pseudo-second order model with an R2 of 0.9979, followed closely by the  Elovich model with an R2 of 0.9952. The obtained results showed the  adsorption of Pb(II) by TA leaves, which is an abundant biological material,  is feasible, cheap and environmentally friendly.

Biosorption of lead contaminated wastewater using cattails (Typha angustifolia) leaves: Kinetic studies