Ceramic bricks containing Ni ions from contaminated biomass used as an adsorbent

Abstract

This article shows how pine sawdust residues can be used to adsorb nickel ions from synthetic solutions and then to produce porous bricks for civil construction using a mixture of natural clay and biomass containing the adsorbed metals. The adsorption tests were performed by mixing NiCl2 solutions with pine sawdust during a fixed stirring period of 24 h. The set was filtered and the filtrate was analysed. Highest efficiency adsorbate/adsorbent ratio was 1 mol L-1 of NiCl2 solution and 20 g L-1 of pine sawdust. This was the contaminated biomass sample used in the manufacture of the bricks. This paper analyses the properties of the bricks achieved and compares them with bricks without added biomass, porous bricks containing zinc and commercial bricks. The obtained values ​​of bulk density (apD), apparent specific weight (aspW), apparent porosity (apP), water absorption (H2OAbs), apparent volume (apV), weight loss on ignition (LOI), compression fracture stress (σstr), flexural modulus of rupture (MOR) and retention efficiency (RE), demonstrate that the ceramic pieces obtained are optimal for construction.