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Esrafily A, Farzadkia M, Jonidi Jafari A, Izanloo M. Removal of 2,4-Dichlorophenoxyacetic acid herbicide from aqueous solutions by Functionalization nanoparticles magnetic: Equilibrium, kinetic and thermodynamic studies. North Khorasan University of Medical Sciences 2018; 9 (4) :1-8
URL: http://journal.nkums.ac.ir/article-1-1306-en.html
URL: http://journal.nkums.ac.ir/article-1-1306-en.html
1- Associate Professor, Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
2- MSc Student, Department of Environmental Health Engineering, Iran University of Medical Sciences, Tehran, Iran , maryam.izanloo@gmail.com
2- MSc Student, Department of Environmental Health Engineering, Iran University of Medical Sciences, Tehran, Iran , maryam.izanloo@gmail.com
Abstract: (4977 Views)
Introduction: Today, toxic organic pollutants are considered as the most serious environmental problems in water resources worldwide. To cope with the problem, different wastewater treatment techniques are developed. In recent years, one of the methods welcomed by researchers is the adsorption of contaminants with magnetic nanoparticles. Therefore, the current study aimed at investigating the removal of 2,4-dichlorophenoxyacetic acid (2,4-D) herbicide from aqueous solutions by Fe3O4@SiO2-NH2 synthesized nanoparticles.
Methods: The Fe3O4@SiO2-NH2 was prepared using a co-precipitation method. The characteristics of the prepared adsorbent were determined based on scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and edX results. In the current study, the effect of pH, initial concentration of pollutant, and absorbent dose in the contact time of 0-120 minutes on the removal efficiency of 2,4-D from aqueous solutions was evaluated. Also, the kinetic equations and equilibrium isotherm studies were conducted.
Results: In the current study, the optimum pH and contact time were 6 and 30 minutes, respectively. Also, by increasing the contact time from 0 to the balance time of 60 minutes, the absorption capacity of 2,4-D was also increased to 65.3%. The results of the kinetic equations and isotherms showed that the adsorption process of 2,4-D followed the second-order kinetic equation and Langmuir isotherm (R2> 0.99). Also, thermodynamic parameters assessment showed that the adsorption was an endothermic and spontaneous procedure.
Conclusions: The results of the current study showed the application of Fe3O4@SiO2-NH2, synthesized nanoparticles as a good method for the removal of 2,4-D from aqueous solutions due to its advantages such as quick and easy separation of contaminants and no secondary pollution of the solution
Methods: The Fe3O4@SiO2-NH2 was prepared using a co-precipitation method. The characteristics of the prepared adsorbent were determined based on scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and edX results. In the current study, the effect of pH, initial concentration of pollutant, and absorbent dose in the contact time of 0-120 minutes on the removal efficiency of 2,4-D from aqueous solutions was evaluated. Also, the kinetic equations and equilibrium isotherm studies were conducted.
Results: In the current study, the optimum pH and contact time were 6 and 30 minutes, respectively. Also, by increasing the contact time from 0 to the balance time of 60 minutes, the absorption capacity of 2,4-D was also increased to 65.3%. The results of the kinetic equations and isotherms showed that the adsorption process of 2,4-D followed the second-order kinetic equation and Langmuir isotherm (R2> 0.99). Also, thermodynamic parameters assessment showed that the adsorption was an endothermic and spontaneous procedure.
Conclusions: The results of the current study showed the application of Fe3O4@SiO2-NH2, synthesized nanoparticles as a good method for the removal of 2,4-D from aqueous solutions due to its advantages such as quick and easy separation of contaminants and no secondary pollution of the solution
Keywords: Absorption, Fe3O4@SiO2-NH2 nanoparticles, 2, 4-dichlorophenoxy acetic acid, kinetic, isotherm
Type of Study: Orginal Research |
Subject:
Public Health
Received: 2018/03/18 | Accepted: 2018/03/18 | Published: 2018/03/18
Received: 2018/03/18 | Accepted: 2018/03/18 | Published: 2018/03/18
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