Removal of Cobalt from Contaminated Water Using Magnetic Iron Oxide Nanoparticles

Document Type : Research Article

Authors

1 null

2 birjand university, birjand, iran.

3 Associate Professor, Faculty of Engineering, Civil-Environmental Department of Birjand University

Abstract

In the present study, the removal of cobalt ions from water by magnetic nanoparticles of Fe3O4 was investigated as a function of pH, time, cobalt ions concentration, and temperature. The design of experiments was performed using Taguchi fractional factorial method to study the effect of these factors at 4 levels on the performance of the nanoparticles synthesized by the co-precipitation technique. Data were analyzed by Coalition software and adsorption experiments were described based on Langmuir and Freundlich equilibrium isotherms. The highest adsorption rate (81%) was achieved at a cobalt initial concentration of 7 mg/l, a temperature of 60 °C, pH of 9, and residence time of 15 minutes. Considering the results of data analysis the optimum process conditions were found to be as follows: pH 9, residence time 10 minutes, cobalt initial concentration 25 mg/ L, and temperature 20 °C. The efficiency of cobalt adsorption was estimated to be 86/383%. The results of experiments on real industrial wastewater containing 36 mg/l cobalt 60 obtained under optimal conditions showed an adsorption efficiency of 71.6%. This indicates a drop of 17.11% that is attributed to the difference between experimental and actual conditions. The data obtained from adsorption isotherms were consistent with the two systems in question and best fitted to the Freundlich model.

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References

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Amirkabir Journal of Civil Engineering
Volume 53, Issue 1
April 2021
Pages 213-228

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