| Abstract [eng] |
The research project of emerging water pollutants consists of four main stages: fabrication of alginate beads, modification of beads, sorption investigation and UV – Vis spectrophotometric analysis. Four types of alginate beads were used for sorption study: 3% calcium alginate beads, 3% calcium alginate beads with 2g of activated carbon, 3% calcium alginate beads with 2g of silica gel, 3% calcium alginate beads with 1g of activated carbon and 1g of silica gel. Methylene blue dye and antibiotic tetracycline at concentrations of 10 mg/L; 7,5 mg/L; 5 mg/L; 2,5 mg/L were used for sorption study. Sorption was monitored for 180 minutes. After the experiment adsorption capacity and adsorption kinetics equilibrium istotherms were investigated. After analyzing the obtained results, determined that alginate beads fitted well to Freundlich isotherm. The maximum sorption capacity of designed system with methylene blue dyes was found to be 29,10 mg/g of calcium alginate beads encapsulated with active carbon, which is 10,5 times higher as compered to calcium alginate beads. In the study of tetracycline, the maximum sorption capacity was found to be 28,13 mg/g of calcium alginate beads modified with activated carbon and it was 25 times higher as compared to not modified beads. However, calcium alginate beads encapsulated with silica gel enhanced sorption capacity only 10 %. Adsorption kinetics were fitted to pseudo–second–order kinetic model. The highest adsorption reaction rate was found at the highest (10 mg/L) initial pollutant concentration with calcium alginate beads encapsulated with activated carbon. The lowest values of sorption rate were obtained for calcium alginate beads at lowest 2,5 mg/L initial solution concentration. |
