Research Information System
FRESENIUS ENVIRONMENTAL BULLETIN, vol.26, no.10, pp.6253-6260, 2017 (SCI-Expanded)
Natural clinoptilolite-zeolite is widely used for enhancing crop production potential of soils by improving chemical and physical properties and treating the polluted water sources. The particle size of the adsorbents is of particular significance for manipulating the adsorption desorption characteristics of sorbed ions. Therefore we tested the effect of micronized natural clinoptilolite-zeolites samples on phosphorus (P) adsorption/desorption. Batch adsorption experiments were conducted using 1 g of adsorbent with 20 mL solution containing 0-50 mg P L-1 prepared in 0.01 M CaCl2 background solution. The desorbability of the P was measured by 0.5 M Na-HCO3 solution at pH 8.5. Sorption kinetic was studied at 5 and 25 mg L-1 initial concentrations for 5, 10, 20, 30 min; 1, 2, 4, 8, 16, and 24 h. Both Freundlich and Langmuir sorption models fitted the sorption data well; however Langmuir model described the data with better determination coefficient. The adsorption capacity of Rota zeolite was slightly higher than Gordes zeolite's capacity. The particle size dependency of sorption capacity was apparent for Gordes zeolite. Results of kinetics study indicated that the adsorption data fit the second-order kinetic model better than the Elovich model. The sorption data indicated that these zeolite deposits have different particle size dependent-P sorption behaviour that may be used for different purposes.