Repository of Research and Investigative Information

Repository of Research and Investigative Information

Kurdistan University of Medical Sciences

Retention of phosphorous ions on natural and engineered waste pumice: Characterization, equilibrium, competing ions, regeneration, kinetic, equilibrium and thermodynamic study

(2013) Retention of phosphorous ions on natural and engineered waste pumice: Characterization, equilibrium, competing ions, regeneration, kinetic, equilibrium and thermodynamic study. Applied Surface Science.

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Abstract

Natural and Mg2+ modified pumice were used for the removal of phosphorous. The adsorbents were characterized using XRF, XRD, SEM and FTIR instrumental techniques. In the optimal conditions, namely at equilibrium time (30 min), for a phosphorus concentration of 15 mg/L and pH 6, 69 and 97 phosphorus removals were achieved using 10 g/L of natural and modified pumice adsorbents, respectively. Maximum adsorption capacities were 11.88 and 17.71 mg/g by natural and modified pumice, respectively. Pseudo-second order kinetic model was the most relevant to describe the kinetic of phosphorus adsorption. External mass transfer coefficient decreased for increasing phosphorous concentration and film diffusion was found to be the rate-controlling step. Only a very low dissolution of the adsorbent was observed, leading to a low increase in conductivity and turbidity. Removal efficiency decreased for increasing ionic strength. It also decreased in the presence of competing ions; however modified pumice remained effective, since 67 of phosphorus was removed, versus only 17 for the natural pumice. The efficiency of the modified pumice was confirmed during the regeneration tests, since 96 regeneration yield was obtained after 510 min experiment, while only 22 was observed for the raw pumice. © 2013 Elsevier B.V. All rights reserved.

Item Type: Article
Keywords: Batch modes; External mass transfer coefficient; Instrumental techniques; Phosphorous; Phosphorous concentrations; Phosphorus concentration; Pseudo-second-order kinetic models; Rate-controlling steps, Abrasives; Adsorbents; Adsorption; Ionic strength; Kinetics; Removal, Phosphorus
Page Range: pp. 419-431
Journal or Publication Title: Applied Surface Science
Volume: 284
Identification Number: 10.1016/j.apsusc.2013.07.114
ISSN: 01694332
Depositing User: مهندس جمال محمودپور
URI: http://eprints.muk.ac.ir/id/eprint/1268

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