Characterization of the process of dye adsorption byadsorbents obtained from tyres and sewage sludges

摘要

The utilisation of different wastes for the production of adsorbent materials is a way of capitalizing on waste and of bringingrndown adsorbent production costs. One option to consider is the use in adsorption processes of residues from the thermolysisrnof tyres (justified by the future industrial trend towards this process) and sewage sludges, as production from wastewaterrntreatment plants is increasing. Here we study the liquid-phase adsorption of industrial dyes by adsorbents produced byrnpyrolysing both the above mentioned materials. Pyrolysis conditions were decided on the basis of devolatilization profilesrnobtained by thermogravimetric analysis. Heating gradients were 40oC/min up to 550oC for the tyres, and up to 650oC for thernsludge and for a mixture of the two. Adsorption equilibrium data plus results of adsorption capacity were obtained,rnequilibrium data were fitted to the Freundlich model, and the quality of the fittings and the characteristic parameters for thernmodel were determined. The influence of temperature on the dye adsorption capacity of the adsorbent materials producedrnwas studied, as were the thermodynamic parameters (DHo, DSo y DGo) for the different adsorption tests.