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Comparison of nano zerovalent iron particles and manganese compounds efficiency in cadmium ion removal from aqueous environments
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Mohamad Malakootian *   1, Abbas Khazaei2 |
1- Kerman University of Medical Sciences , m.malakootian@yahoo.com
2- Kerman University of Medical Sciences |
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Abstract: (8245 Views) |
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Introduction: Cadmium is dangerous due to the properties such as persistence and accumulation in the environment. The aim of study was the survey of cadmium ions removal in various conditions by nano zerovalent iron (nZVI) particles and manganese compounds.
Material & Methods: Absorbents were prepared according to used methods in literatures. After batch study of cadmium adsorption in synthetic solution by nZVI particles and manganese compounds (under various conditions of pH, concentration, and contact time), removal efficiency of cadmium from industrial wastewater sample was studied.
Findings: The average size of the nanoparticles was 78 nm (by Dynamic Light Scattering analysis). Maximum Cadmium ion adsorption capacity from synthetic solution by nZVI particles in optimal conditions (pH = 7, the initial cadmium ions concentration= 20 mg/L, and contact time =60 min) was 58.1 mg/g, with hydrated manganese dioxide and the its composition with ferric hydroxide in optimal conditions (pH = 9, the initial cadmium ions concentration= 1 mg/L and contact time = 10 min) was 13.5 and 12.8 mg/g, respectively. Maximum efficiency of cadmium removal in the industrial wastewater by nZVI particles, hydrated manganese dioxide and its combine with ferric hydroxide were 91 %, 28 % and 27.8 % respectively.
Discussion & Conclusion: Results showed that nZVI particle is more effective than manganese compounds in cadmium removal from synthetic solution and industrial wastewater with provide optimal conditions. Therefore it is more effective for removal of cadmium in contaminated aqueous environments. |
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| Keywords: Nano zerovalent iron particles, Manganese compounds, Cadmium |
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Full-Text [PDF 669 kb]
(2775 Downloads)
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Type of Study: Research |
Subject:
Environmental health
Received: 2013/07/16 | Accepted: 2014/01/5 | Published: 2014/06/15
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