E. Álvarez-Ayuso

TL;DR: It was found that synthesised geopolymer matrixes were only effective in the chemical immobilisation of a number of elements of environmental concern contained in fly ashes, reducing (especially for Ba), or maintaining their leachable contents after the geopolymisation process, but not for those elements present as oxyanions.

TL;DR: The results show that the zeolitic material considerably decreases the leaching of Cd, Co, Cu, Ni, and Zn, and the sorption of metals in soil clay minerals (illite) proved to be the main cause contributing to the immobilization of these pollutants.

TL;DR: The sorption characteristics of palygorskite with respect to cadmium were studied, showing the effectiveness of this mineral to purify down to the legal limit of waste moderate volumes of Cd-containing solutions with a similar concentration to those mostly found in the upper range of concentrations usually present in industrial wastewaters.

TL;DR: The low solubility of scorodite, the relatively low content of AFA and the formation of compounds of variable charge, mostly of amorphous nature, with high capacity to adsorb As attenuate importantly the dispersion of this element into the environment from these arsenopyrite-bearing wastes.