The biosorption is a new technology, which can be widely applied for the removal of heavy metals from wastewater. The development of an efficient and low-cost adsorbent is a key in the biosorption technology. The adsorption performance of Pb(Ⅱ) by the fermented sweet sorghum stalks (FSSR) is discussed in this paper. The adsorption process is a chemical one and follows the pseudo-second order kinetics. After fermented, the equilibrium adsorption capacity of the material is increased from 3.32 mg/g to 6.92 mg/g. The isotherm adsorption is fitted well with the linear Langmuir model. When the temperature rises from 10℃ to 40℃, the maximum adsorption capacity of Pb (Ⅱ) is increased from 5.92 mg/g to 7.23 mg/g. In binary and ternary systems, the adsorption capacities are in the order of Pb(Ⅱ) > Cu (Ⅱ) > Zn(Ⅱ). There are more active functional groups on the surface of the stalk after fermentation, and these changes will be beneficial to the adsorption reaction and can improve the adsorption capacity.

sweet sorghum stalk  /  fermentation  /  adsorption  /  heavy metal