Search published articles


Showing 2 results for Jonidi Jafari
Evaluation the number of cases of mortality and hospitalization due to cardiovascular disease and Chronic Obstructive Pulmonary Disease (COPD) Attributed to ozone in the air of Tehran Megacity During past decade (2005-2015)
M Kermani , M Dowlati , A Jonidi Jafari , R Rezaeikalantari ,
Volume 9, Issue 1 (7-2017)
Abstract

Background & objectives: Ozone is one of the most important gaseous pollutants in the air, which is necessary to be evaluated in the case of its harmful effects on human health. The present study was performed to assess the rate of mortality and hospitalization due to cardiovascular disease and Chronic Obstructive Pulmonary Disease (COPD) which are attributed to ozone in the air of Tehran during last decade (2005-2015).

Materials and Methods: This study was a descriptive–analytic. Firstly, hourly data of ozone pollutant were taken from Tehran environmental protection agency and air quality control. Data were validated according to the WHO guidelines. Required statistical parameters were calculated for health effect quantifying. Finally, processed data were converted to required inputs for the AirQ software and health effects quantifying were performed.

Results: Results showed that the number of total mortality due to Ozone exposure was 8222 cases in the past decade. The total number of cardiovascular mortality attributed to ozone in the past decade was 5951 people and the total number of respiratory mortality attributed to ozone in the past decade was 2947 people between 2005-2015.

Conclusions: According to the results, ozone has adverse effects on human health. Regarding the high levels of air pollution in Tehran and mortality and its related health consequences, appropriate measures should be taken to reduce the air pollution.


Removal of 2,4-Dichlorophenoxyacetic acid herbicide from aqueous solutions by Functionalization nanoparticles magnetic: Equilibrium, kinetic and thermodynamic studies
Ali Esrafily, Mahdi Farzadkia, Ahmad Jonidi Jafari, Maryam Izanloo,
Volume 9, Issue 4 (3-2018)
Abstract
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

Page 1 from 1     

© 2025 CC BY-NC 4.0 | Journal of North Khorasan University of Medical Sciences

Designed & Developed by: Yektaweb