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:: Volume 5, Number 4 (winter 2015) ::
j.health 2015, 5(4): 275-288 Back to browse issues page
Adsorption of Cyanide from Aqueous Solutions Using Magnetic Hydroxyapatite Nanoparticles Synthesized by Hydrothermal Method: Equilibrium and Kinetic Study
R Nourozi, M NooriSepehr, M Zarrabi
Albourz University of Medical Sciences
Abstract:   (5978 Views)

Background & Objectives: Cyanide is a toxic compound widely used in different industries (e.g. metal extraction) and enters into the environment through such activities. Methods: In present work magnetic hydroxyapatite nanoparticles were synthesized hydrothermally and used for removal of cyanide from aqueous solutions. Experimental parameters influencing the process such as solution pH, initial cyanide concentration, nanoparticle concentrations, and contact time were studied. In addition Langmuir and Freundlich isotherm models, pseudo-first-order, pseudo-second-order, and modified pseudo-first-order kinetic models were applied for describing the process. Restoration of used sorbent was also investigated. Results: Maximum removal efficiency was observed at 10 mg/L of cyanide concentration, 0.8 g/L adsorbent mass, 120 min contact time, and pH=4. Under these conditions more than 92% of cyanide ions were removed. Results of isotherm study showed that trend of cyanide ion sorption to follow Langmuir model (r2=0.998). In addition, kinetic of cyanide sorption was best described by pseudo-second-order kinetic model (r2=0.999). 70% of the used sorbent can be conditioned by 1 N NaOH solution. Conclusion: The results of present work well demonstrate that nano magnetic adsorbent to have high ability to remove cyanide pollutant.

Keywords: Adsorption, Nanoparticle, Magnetic Hydroxyapatite, Cyanide, Aqueous Solution
Full-Text [PDF 494 kb]   (2233 Downloads)    
Type of Study: Research | Subject: Special
Received: 2015/01/31 | Accepted: 2015/01/31 | Published: 2015/01/31
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Nourozi R, NooriSepehr M, Zarrabi M. Adsorption of Cyanide from Aqueous Solutions Using Magnetic Hydroxyapatite Nanoparticles Synthesized by Hydrothermal Method: Equilibrium and Kinetic Study. j.health. 2015; 5 (4) :275-288
URL: http://healthjournal.arums.ac.ir/article-1-472-en.html
Volume 5, Number 4 (winter 2015) Back to browse issues page
مجله سلامت و بهداشت Journal of Health
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