Immobilization of Zn(II) ions from contaminated biomass using ceramic matrices.

•Residual pine sawdust has the capacity to adsorb Zn(II) ions in a 24 h adsorption system.•The 10 g/L system of sawdust and concentration of 6.5 × 104 mg/L of metal is the most efficient.•The most efficient system is used in the manufacture of lightweight ceramic materials where biomass is the pore maker.•Tests show that the metal remains immobilized within these matrices.•The sintered products have good mechanical properties within the requirements of the market.