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Showing 5 results for Sadeghi

Nahid Nabavi, Mazyar Peyda, Gholamreza Sadeghi,
Volume 2, Issue 3 (6-2017)

Background: In the present study, the photocatalytic (TiO2/UV) batch process has been used for the methyl orange (MO) degradation.
Methods: In the catalyst range from 0.25 to 1.5 g/L, the optimum concentration of TiO2 was found to be 0.5 g/L. The kinetic behavior of MO degradation has been evaluated using the non-linear form of pseudo-first order and pseudo-second order models.
Results: The goodness of the fit was evaluated using the correlation coefficient R2 value and the mean square error (MSE) function.
Conclusion: The kinetic studies revealed that the pseudo-first order model (k1 = -0.0593 min-1) is more suitable to fit the experimental data (R2 = 0.957, MSE = 0.00271) of MO degradation.


Mojtaba Raeisi , Mohammad Hashemi , Ali Reza Sadeghi , Majid Aminzare , Mahdi Khodadadi, Amir Mahmoud Ahmadzadeh , Asma Afshari,
Volume 2, Issue 4 (9-2017)

Background: Zataria multiflora boiss is a member of Lamiaceae family with antibacterial, antifungal, and antioxidant activity. The aim of this study was to evaluate chemical composition and antibacterial effect of Zataria multiflora essential oil against two foodborne pathogens in meat.
Methods: The inhibitory effect of Zataria multiflora essential oil (Minimum inhibitory concentration and Minimum bactericidal concentration) was evaluated against Salmonella  typhimurium and Listeria monocytogenes, inoculated in ground beef meat after 3, 5, 7 and 9 days of storage.
Results: Result revealed 26 various compounds, representing 96.27% of total oil. Thymol was the most abundant compound among all constituents (29.2%). A significant reduction was observed in Salmonella typhimurium when adding 1 and 2% Zataria multiflora (p<0.05) compared with 0.5% and 1% concentrations during 9 days of storage. Listeria monocytogenes significantly decreased in treatments with 0.5%, 1 and 2% of Zataria multiflora essential oil.
Conclusion: Zataria multiflora has an inhibitory effect on the growth of L. monocytogenes and in higher concentrations on the growth of S. typhimurium and can be used as a natural preservative in order to retard the growth of food-borne pathogens.

Davoud Balarak, Mohadeseh Dashtizadeh, Mohadeseh Zafariyan, Masomeh Sadeghi,
Volume 4, Issue 4 (12-2018)

Background: Nowadays, the development of new materials is emergent that can be used in the adsorption process to remove dyes from the aquatic environment. Therefore, in this study, the performance of raw Kaolin as a low cost adsorbent was evaluated in removing Direct Blue 71 (DB71) dye from aqueous solutions.
Methods: For investigating the adsorption, various parameters were optimized and data were adjusted to four isotherm models: Freundlich, Dubinin–Radushkevich, Langmuir and Temkin, in order to determine the one presenting the best adjustment to the experimental data. Moreover, the kinetics study for adsorption was evaluated using diffusion, pseudo-first-order kinetic and pseudo-second-order kinetic models.
Results: The results revealed that at the DB71 concentration of 10 mg/L, adsorbent dose of 2.5 g/L, and contact time of 75 min, the DB71 removal reached 98.5%. Adsorption data fitted best into the Langmuir and D-R adsorption isotherms. The maximum monolayer adsorption capacity was 36.41 mg/g. The pseudo second order kinetics best described the kinetics of the adsorption system.
Conclusion: It was revealed that Kaolin could be applied for DB71 dye removal from solution samples with the adsorption capacity of 36.41 mg/g and thus could be used as a low-cost and effective adsorbent.

Mahdi Sadeghi, Mojtaba Raeisi, Mina Ghahrechi, Narges Rezaie, Bagher Pahlevanzadehe,
Volume 5, Issue 2 (6-2019)

Background: With the growing use of bottled water, the continuous research and monitoring of the quality of these products are crucial. The present study aimed to assess the chemical quality of the bottled water distributed in Gorgan, Iran.
Methods: This cross-sectional, descriptive-analytical study was conducted on the samples of bottled water distributed in Gorgan city. Sampling was performed during four months (one sample of each brand obtained every month; total: 36). The chemical quality of the samples was measured using standard methods.
Results: The mean concentrations of nitrate, fluoride, and iron and mean pH of the samples were 12.92 ± 11.05, 0.33 ± 0.12, and 0.64 ± 2.9 mg/l and 6.89 ± 0.39, respectively. Only the physicochemical parameters of pH and iron were significantly higher than the standard values, and the mean levels of the chemical factors were significantly lower than the standard values (P < 0.05).
Conclusion: Consumers expect bottled water to have higher quality as they perceive the product to be a healthier choice than the water supplied by urban distribution networks. High levels of some chemical parameters could adversely affect the health of consumers, especially vulnerable populations, which should be taken into consideration by custodians and authorities.

Mehrdad Inanloo, Gholamreza Sadeghi,
Volume 5, Issue 4 (12-2019)

Background: Chemical industries and facilities pose the risk of potential hazards in case of accidents, which lead to injuries and financial losses due to the spread of materials in the surroundings of the accident. These materials often have harmful properties (e.g., toxicity or flammability), and their release could cause secondary accidents (e.g., fire, poisoning, and explosion). The present study aimed to assess the effects of toxic sulfur dioxide (SO2) in a suffocation unit.
Methods: A possible scenario of SO2 emission was selected using the matrix presented by the researchers. Afterwards, the hazard and operability study method was used to analyze the conditions. The modeling and evaluation of the outcomes of the selected scenario for SO2 gas emission from the gas pipeline were carried out using the PHAST7.11 software.
Results: The worst scenario was observed in the employees within the approximate distance of 10 meters and height of two meters from the gas leakage (100 mm leakage diameter) and gas diffusion angled from horizontal impingement.
Conclusion: About 1.84 seconds after the leakage of toxic SO2 (distance: 10 meters, height: 1.39 m), the concentration was approximately 39,339 ppm, which was the worst scenario in August, with the possible mortality risk of 49%.

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