Využití křídlatky pro sorpci olovnatých iontů

The article deals with possibility of knotweed (Fallopia Bohemica) utilization as a cheap and renewable biosorbent for purifying of wastewaters containing Pb(II) ions. Material was characterized from the sight of structural homogeneity. It was found out that differences among particular samples were small. The time dependence of sorption was studied. It was found that sorption process is fast (maximal adsorbed amount was reached already after 2 hours). Adsorption isotherm of Pb(II) ions at knotweed corresponds to Langmuir model, maximal adsorbed amount was 53.5 mg Pb/g of knotweed. Mechanism of sorption seems to be mainly complexation of Pb(II) ions with multiple (π) bonds of molecules contained in the material. It was found by comparison with natural bentonite that sorption capacity of knotweed is approximately half of sorption capacity of used bentonite.