Lead removal from water solutions by natural and Fe(III)-modified zeolite encapsulated with alginate

Abstract

In presented paper removal of lead ions from water solutions by the natural and Fe(III)- modified zeolite encapsulated with alginate was investigated. Experiments were performed for the initial lead concentrations in the range from 330 to 3100 mgPb(II)/dm3 and for three temperatures: 25, 40 and 60oC. Results showed increase of adsorbed amount of lead with increasing temperature and the initial lead concentrations. Much better removal of lead was obtained with Fe(III)-modified zeolite encapsulated with alginate. The maximal removed amounts of lead obtained for highest initial concentration were: 103, 113 and 124 mg/g for NZA and 137, 153 and 173 mg/g for FeA at 30, 40 and 60oC, respectively. Obtained results were fitted with Freundlich and Langmuir model, and for all temperatures the best fits were obtained with Freundlich model (R2>0.97).