Analytical Survey of the Kinetics and Thermodynamics of Phosphate Adsorption From Aqueous Solutions using Bone Charcoal

Document Type : Original Research

Authors

1 Department of Environmental Health Engineering. School of health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran

2 Department of Environmental Health Engineering, International Branch of Shahid Sadoughi University of Medical Sciences, Yazd, Iran

3 Health Research Center, Baqiyatallah University of Medical Sciences, Tehran, Ira

Abstract

Aims: Phosphorous (P) is one of the military wastewater pollutants which has a key role in water resource eutrophication. The aim of this study was to analyze the kinetics and thermodynamics of the P adsorption by using bone charcoal (BC).

Methods: BC was prepared in 400 °C and 2 h and pulverized via ASTM standard sieves in the range of 35-100 mesh. The structure of BC was analyzed using X-Ray Diffraction (XRD) and Scanning Electronic Microscopy (SEM). The concentration of P was analyzed by spectrophotometer methods. Analysis of data was performed with pseudo first -order and pseudo second -order kinetic models, Langmuir, Freundlich, Elovich and Dubinin-Radushkovich (D-R) models.

Results: The main component of BC is calcium hydroxyl apatite. The adsorption of P for the preliminary concentrations of 10 and 20 mg/l complies with the pseudo first- order kinetic model but for 50 and 100 mg/l complies with the pseudo second-order kinetic model. The energy of the adsorption reaction is 6.24 J/molºK which implies physical sorption. Based on the Langmuir model the adsorption capacity is 13.2 mg/g.

Conclusion: Based on the BC adsorption capacity for P removal, it can be said that this absorbent could be utilized for the elimination of phosphorous and similar pollutants from water and wastewater.

 

Keywords

Journal of Military Medicine
Volume 16, Issue 4 - Serial Number 58
March and April 2015
Pages 183-189

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