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

SIMÓN, DAIANA; QUARANTA, NANCY; MEDICI, SANDRA; COSTAS, AGUSTÍN; CRISTÓBAL, ADRIÁN

JOURNAL OF HAZARDOUS MATERIALS.

ELSEVIER SCIENCE BV

Año: 2019 vol. 373 p. 687 - 697

0304-3894

This article describes the adsorption of zinc ions from synthetic solutions using residual pine sawdust as anadsorbent and, subsequently, the use of clay ceramic pieces and contaminated biomass as metal immobilizers.The process of adsorption was carried out with a synthetic solution of ZnCl2 in contact with sawdust for afixed time of 24 h. The mixture was stirred continually. The mixture was then filtered, and the metal ions notadsorbed by the biomass and present in the liquid phase were quantified. The physicochemical characteristics ofthe sawdust were determined by thermogravimetric and differential thermal analysis, infrared Fourier transformspectroscopy, fluorescence and X-ray diffraction, among others.The adsorption kinetics shows that the equilibrium was reached at 24 h. The most efficient ratio of theamount of biomass and the concentration of Zn(II) was 10 g/L of sawdust and 6.5×104 mg/L of metal, whichwas used to analyse the capacity of metal immobilization in the designed bricks.The values obtained for the apparent porosity, the loss of weight by ignition, the mechanical properties andthe efficiency of retention, indicate that these bricks are suitable for use in civil construction.