مقالات رزومه دکتر صادق قاسمی

Due to its low cost, simplicity and speed of separation and high efficiency, the magnetic separation method widely used to remove contaminants and to solve the problems of the environment. The aim of this study was synthesis of magnetic activated carbon by Fe3O4 and investigating its efficiency in adsorption of Cadmium from aqueous solutions.  

Magnetic adsorbent prepared by the method of sequestration and physical characteristics and structure of synthesized absorbent were determined by XRD, SEM and TEM. To remove the Cadmium from aqueous solutions, the Box-behnken design (BBD) of response surface methodology (RSM) was employed for optimizing all parameters affecting the adsorption process. The studied parameters were pH (5-9), temperature (25-45 0C) and the amount of adsorbent (0.5-2 g). 15 experimental runs were calculated by using BBD.

The optimal condition for removal Cadmium by synthesis of magnetic activated carbon by Fe3O4 nanoparticles were pH=7, 450C temperature and the 2 g of adsorbent.

The study showed that magnetic activated carbon has a high potential for removing cadmium. Therefore, it is believed that magnetized active carbon by keeping its physical and surface properties could be a suitable method to solve some related problems including separation and filtration.

One of the serious issues in recent years, the role of sulfur and its various combinations like sulfate as part of pollutants in output waste. Given that today, the use of nano substances for treatment of environment pollutants is highly under attention. The purpose of this study is to use of magnetic iron oxide nanoparticles (Fe3O4) under UV irradiation for sulfate removal.
The experiments were conducted in batch system and the effect of pH, the amount of nanoparticles, contact time and the initial concentration of sulfate under UV irradiation (8w) were examined. The most common isotherms and kinetics of adsorption were applied to analyze sulfate removal and the reaction rate.
According to the results, the maximum efficiency of sulfate adsorption was 77.92% which was obtained in pH of 7 and contact time of 90 minutes and 2 g/L of nano substances. Data for this study indicated a good correspondence with isotherms of Longmire. The analysis of kinetic indicated that nitrate removal is consistent with the second-degree kinetic adsorption model.
Finally, it should be noted that the process of photocatalytic magnetic iron oxide nanoparticles and ultraviolet (UV - C) could lead to a significant reduction in emissions of sulfate from sewage.