Volume 15, Issue 4 (3-2018)
sjsph 2018, 15(4): 389-400 |
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Karimi B, Khanaki S, Ma’mani L, Khezri S M, Karami A. Efficient Removal of Organophosphate Pesticide Imidacloprid from Water Samples by Modified Magnetic-Silica Core-Shell Nanoparticles as a Recoverable Nano-Adsorbent. sjsph 2018; 15 (4) :389-400
URL: http://sjsph.tums.ac.ir/article-1-5591-en.html
URL: http://sjsph.tums.ac.ir/article-1-5591-en.html
1- MS.c. Department of Environment and Energy, Faculty Environmental Engineering, Islamic Azad University, Tehran, Iran
2- Ph.D. Assistant Professor, Department of Nanotechnology, Agricultural Biotechnology Research Institute of Iran(ABRII), Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
3- Ph.D. Associate Professor, Department of Environment and Energy, Faculty Environmental Engineering, Islamic Azad University, Tehran, Iran ,s.m.khezri1@gmail.com
4- MS.c. Department of Chemistry, Industrial Research Organization Sharif, Tehran, Iran
2- Ph.D. Assistant Professor, Department of Nanotechnology, Agricultural Biotechnology Research Institute of Iran(ABRII), Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
3- Ph.D. Associate Professor, Department of Environment and Energy, Faculty Environmental Engineering, Islamic Azad University, Tehran, Iran ,
4- MS.c. Department of Chemistry, Industrial Research Organization Sharif, Tehran, Iran
Abstract: (4068 Views)
Background and Aim: Agricultural poisons are one of the most important groups of pollutants in agricultural industries that cause environmental pollution. The main objective of this research was to remove imidacloprid from contaminated water by using modified magnetic-silica core-shell nanoparticles.
Materials and Methods: This study was conducted at the laboratory scale and batch system. The physical and structural characteristics of the synthesized adsorbent were determined by scanning electron microscopy (SEM). In addition, the effects of various parameters such as pH, initial concentration of imidacloprid, adsorbent dose, and contact time were investigated in order to determine the equilibrium isotherms and adsorption kinetics. The potential of the adsorbent for removal of imidacloprid showed no significant change after four runs of the reaction.
Results: The highest efficiency was found to be 97.85 %, achieved at the following conditions: a contact time of 67 minutes, an adsorbent dose of 0.06 g/l, an initial concentration of 15.6 mg/l and a pH of 6.5. The correlation coefficient of Langmuir isotherm (R2=0.9843) was higher than that of Freundlich (R2=0.8). Therefore, the Langmuir isotherm model is hereby introduced to be used for predicting the adsorption behavior of imidacloprid onto the nano-adsorbent from an aqueous medium. The reaction kinetics fitted well with the pseudo-second-order model.
Conclusion: A modified magnetic-silica core-shell nanoparticle is a cost-effective and recoverable adsorbent for efficient removal of imidacloprid from contaminated water.
Materials and Methods: This study was conducted at the laboratory scale and batch system. The physical and structural characteristics of the synthesized adsorbent were determined by scanning electron microscopy (SEM). In addition, the effects of various parameters such as pH, initial concentration of imidacloprid, adsorbent dose, and contact time were investigated in order to determine the equilibrium isotherms and adsorption kinetics. The potential of the adsorbent for removal of imidacloprid showed no significant change after four runs of the reaction.
Results: The highest efficiency was found to be 97.85 %, achieved at the following conditions: a contact time of 67 minutes, an adsorbent dose of 0.06 g/l, an initial concentration of 15.6 mg/l and a pH of 6.5. The correlation coefficient of Langmuir isotherm (R2=0.9843) was higher than that of Freundlich (R2=0.8). Therefore, the Langmuir isotherm model is hereby introduced to be used for predicting the adsorption behavior of imidacloprid onto the nano-adsorbent from an aqueous medium. The reaction kinetics fitted well with the pseudo-second-order model.
Conclusion: A modified magnetic-silica core-shell nanoparticle is a cost-effective and recoverable adsorbent for efficient removal of imidacloprid from contaminated water.
Keywords: Adsorption, Imidacloprid, Modified Magnetic-Silica Core-Shell Nanoparticles, Water Treatment
Type of Study: Research |
Subject:
Public Health
Received: 2018/03/14 | Accepted: 2018/03/14 | Published: 2018/03/14
Received: 2018/03/14 | Accepted: 2018/03/14 | Published: 2018/03/14
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