List of Articles پلاسمای سرد فشار اتمسفری

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  1 - Degradation rate of Methyl Orange organic dye by high voltage spark plasma
  faezeh rahimi mahdi momeni mansour arab chamjangali
  10.30495/jest.2022.59963.5364
  Background and Objective: One of the most important problems of modern society is water pollution.  Among these pollutants are organic dyes pollutant in industrial factories effluent, which the removal them is very important. The purpose of this study is to provide More

  Background and Objective: One of the most important problems of modern society is water pollution.  Among these pollutants are organic dyes pollutant in industrial factories effluent, which the removal them is very important. The purpose of this study is to provide a solution to eliminate the methyl orange organic dye in industrial factories wastewater by Spark plasma. Material and Methodology: In this study, the decolorization and degradation of methyl orange solution were investigated by electrical discharge plasma method at the water-gas interface. The electrical discharge device used in the present work is spark type plasma with needle-plate electrode structure, with effective voltage 1-12 KV and constant frequency 13 KHz. Findings: The results show that decolorization and degradation of methyl orange dye solution begins at the air-gas-air interface, which can be due to ultraviolet radiation and production of OH radical and highly reactive species H2O2 at the air-gas interface. The effects of the discharge device parameters such as the applied voltage, electrode gap, treatment time and also chemical effects of the solution such as the concentration of the dye have a significant role on decolorization. The results showed that with increasing voltage and increasing treatment time, the amount of decolorization increases, and also by keep the electrical power of the device constant, the amount of decolorization decreases with increasing concentration. Selecting a distance of 2 cm between the electrodes, the highest amounts of decolorization in solution have been observed.    Discussion and Conclusion: In this reactor, the initial pH has no significant effect on decolorization efficiency. Also, the highest decolorization rate of 99.8% occurred at a concentration of 30 ppm, effective voltage 10 KV, electrode gap of 2 cm, initial pH = 3 and in 30 minutes treatment time.   Manuscript profile
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  2 - Investigating the effect of atmospheric pressure cold plasma on oxidation indices and microbial quality of red pepper
  Samaneh Khodabandeh shahraki Mohammad Goli Sharifeh Shahi
  10.30495/jfm.2024.1994234.1829
  Spices are popular worldwide for increasing appetite and adding flavor and color to food, but they also carry a high microbial load. Cold plasma is a non-thermal technology and a suitable alternative to the conventional thermal methods used in the food industry, which, More

  Spices are popular worldwide for increasing appetite and adding flavor and color to food, but they also carry a high microbial load. Cold plasma is a non-thermal technology and a suitable alternative to the conventional thermal methods used in the food industry, which, with its antimicrobial properties, increases the shelf life of food without negatively affecting its quality. The purpose of this research was to investigate some qualitative and microbial properties of red pepper by a cold plasma method. The results showed that the plasma voltage had a greater effect on improving and maintaining the total phenolic content of red pepper than the duration of irradiation, so the use of cold plasma treatment with medium voltage (16.66 kV) increased the total phenolic content of red pepper compared to the voltages lower and higher were superior. The acid value, peroxide value, thiobarbituric acid, and anisidine index of the treatments were significantly higher than the control sample (p<0.05), and the control sample had the lowest oxidation indices. The total count of microorganisms, Staphylococcus aureus, and E. coli in the treated samples was significantly less than the control sample (p<0.05). According to the obtained results, the cold plasma method is suggested for food processing because it can maintain the quality of food at an acceptable level. Manuscript profile