Termodynamická a kinetická studie sorpce zinku a kadmia z vodného prostředí pomocí popela ze spalování biomasy

Abstract

The thesis deals with the thermodynamic and kinetic study of the sorption of cadmium and zinc from the aquatic environment by means of fly ash from plant biomass, including the experiment. Bearing ash from the combustion of plant biomass in a thermal power plant was used as adsorbent. XRD, XRF, physisorption, FTIR and SEM/EDX methods were used to characterize it. The adsorption of zinc and cadmium was tested in the adsorption mode. The concentration of the model solutions was 100 mg l-1. The effect of particle size on the adsorbent efficiency as well as the pH value of the model solution as a function of the contact time between the adsorbent and adsorbate was investigated as part of the kinetics study. Langmuir and Freundlich adsorption isotherms were used to test the adsorbent as part of the thermodynamic equilibrium study. Neither model was suitable for describing the adsorption data obtained for zinc. In the case of cadmium, the Langmuir adsorption isotherm could be used. The studied untreated adsorbent is not suitable for zinc removal, but it can be used for the treatment of industrial wastewater.