Showing 8 results for Akbari
Z Akbari Jonoush, M Farzadkia, S Naseri, H.r Mohajerani, A Esrafili Dizaji, Y Dadban Shahamat,
Volume 7, Issue 4 (1-2015)
Abstract
Background and Objectives: Increased growing nuclear industry has increased the researchers concerns on uranium presence in the environment and its effects on human health. Uranium is a dangerous radioactive heavy metal with high half-life and chemical toxicity. Therefore, the main objective of this study was to removal uranium (VI) from aqueous solution by uranium benzamide complex using AC_Fe3O4 nanocomposite. Materials and Methods: AC_Fe3O4 nanocomposite was synthesized using co-precipitation method. The experiments were designed as one factor at the time method. The optimum range of pH, contact time, amounts of adsorbent, and concentration of benzamide were determined. Then, kinetic and isotherm of uranium adsorption were studied. In addition, the properties of this adsorbent were characterized using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR). Results: The SEM and FTIR analysis confirmed that activated carbon is coated with Fe3O4 nanoparticles and the magnetic property of AC-Fe2O3 was approved. According to the results, the optimum conditions were pH =6, contact time =30 min, and 0.06 g of adsorbent dose. The adsorption of uranium on the AC_Fe3O4 nanocomposite fitted to Langmuir isotherm and pseudo-second order kinetic model. The removal of U(VI) was increased about 6% with increasing in benzamide concentration to 50 mg/L. The best percentage removal of uranium in aqueous solution was 95%. Conclusion: The removal of U(VI) on AC_Fe3O4 nanocomposite with the aid of benzamide is a rapid and highly pH depended process. The maximum sorption capacity (15/87 mg/g) of AC_Fe3O4 nanocomposite shows that this method is a suitable method for Uranium removal.
E Aseman, Gh.r Mostafaii, H Sayyaf, H.a Asgharnia, H Akbari, L Iranshahi,
Volume 8, Issue 3 (12-2015)
Abstract
Background and Objectives: In the field of environmental risk assessment, the earthworms are considered as the major component of the soil, and are important bio- indicators to measure the environmental health and quality of the soil. Hence, the present study aimed to prove the biological effectiveness of Eisenia fetida earthworms in Bioremediation the soils contaminated with chromium and cadmium.
Methods and Materials: The study batch experiments were conducted on the soil samples contaminated with chromium and cadmium. The initial concentration of chromium and cadmium in soil was 0.04 and 0.08 mg/g. 30 worms were added to each 500 g soil samples. Chromium and cadmium concentration in soil and in the body of worms was measured at two time periods of 21 and 42 days. ICP spectrometry we used to measure the concentration of chromium and cadmium. The data were analyzed using SPSS version 11.5 software.
Results: There was a significant correlation between the reduction of chromium and cadmium metals in the soils and the accumulation of chromium and cadmium metals in the worm’s body. A significant decline of chromium levels of the soil was observed in the days 21 and 42 during the study compared to the initial amount of 0.1 mg/g. On the other hand, chromium concentration of the soil decreased from 0.14 to 0.1 mg/g after 42 days.
Conclusion: said the research indicated that increased mortality of worms in the soil at a concentration of 0.08 mg/g of chromium, using the worms for bioremediation is not recommended. Although, this method is effective to remove cadmium from the soils having cadmium with concentrations of 0.04 and 0.08 mg/g but it needs further investigation.
Somaye Akbari, Gholamreza Moussavi, Stefanos Giannakis,
Volume 14, Issue 4 (3-2022)
Abstract
Background and Objective: Imidacloprid, a neonicotinide plant toxin, is used as an insecticide in agriculture. Due to its high degradation resistance and water solubility it is of highly concerns. Therefore, the aim of this study was to investigate the degradation of imidacloprid by modified magnesium oxide catalyst under irradiation of light and peroxymonosulfate.
Materials and Methods: In this study, modification of magnesium oxide with nitrogen was made by sol-gel method and then iron oxide nanoparticles was used as a magnetic source. Operational parameters were catalyst loading, peroxymonosulfate concentration, reaction time and common anions (nitrate, bicarbonate and chloride). Residual concentration of contaminant was measured by high performance liquid chromatography (HPLC) and mineralization rate was evaluated by measuring TOC.
Results: The results of the study showed that the photocatalytic degradation of the pollutant in the optimal condition was as following: catalyst concentration= 150 mg/L, peroxymonosulfate = 75 mg/L and reaction time= 60 min was 88%. Moreover, at optimum condition, the rate of mineralization was obtained 52%. Results comparison for prepared catalyst under light and dark condition indicated that the as-made catalyst is photocatalytic.
Conclusion: The as-prepared catalyst can be activated as a photocatalyst under LED light and proxymonosulfate for removal of organic pollutants.
Zohreh Akbari Jonoush, Abbas Rezaee, Ali Ghaffarinejad,
Volume 15, Issue 2 (8-2022)
Abstract
Background and Objective: This study aimed to provide an effective electro-catalytic system for the simultaneous reduction of nitrate and disinfection of contaminated water by the electro-catalytic performance of Ni-Fe/Fe3O4 cathode.
Materials and Methods: At first, the Ni-Fe electrode was synthesized by the electro-deposition process. Then its physical properties were analyzed by scanning electron microscopy (FESEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, and photoelectron X-ray spectroscopy (XPS). Simultaneous disinfection and reduction of nitrate were performed under the following conditions: 15 mg Fe3O4 nanoparticles, pH 6.5, NaCl 10 mM, 50 mg/L nitrate, 105 CFU/mL and current density 4 mA/cm2.
Results: According to the results obtained in the absence of nitrate, 100 % of Escherichia coli bacteria were disinfected after 12 minutes. In the presence of nitrate, the time of complete disinfection increased to 120 minutes. In the absence of bacteria, 83% of nitrate was removed in 240 minutes, and in the presence of bacteria, the nitrate reduction efficiency increased slightly to 88%. In the nitrate reduction process, nitrite (0.22 mg/L) and ammonium (3.6 mg/L) were produced. In the presence of bacteria, the amounts of nitrite and ammonium produced increased to 0.42 mg/L and 7.3 mg/L.
Conclusion: The results show the outstanding ability of Ni-Fe/Fe3O4 electrode in electro-catalytic reduction of nitrate and disinfection of contaminated water separately and simultaneously with high efficiency and high selectivity to nitrogen.
Hossein Masoumbeigi, Davood Motalebi Peykani, Ghader Ghanizadeh, Hamed Akbari Jour, Maryam Esmaeili,
Volume 16, Issue 4 (3-2024)
Abstract
Background and Objective: The health and safety of the employees of any industry is one of the most important issues to prevent the occurrence of accidents. This study aimed to identify and assess related risks in a battery-manufacturing industry using FMEA method and estimate the ratio of the cost of accidents to prevention.
Materials and Methods: In this descriptive and analytical study, the production activities of the industry were first identified. Then the work process, employee duties, and Potential risks were determined by the HAZID method. Evaluation and prioritization of risks were done using FMEA method. Risks whose RPN was higher than 145 were determined as important risks and the ratio of incident cost to accident prevention was calculated.
Results: In 62 active units of this industry, 716 risks were identified and prioritized, 16 of which (2.23%) had RPN above 145 with the highest priority. The financial pulp unit with falling and fire hazards and the assembly unit with the risk of fumes and lead dust leakage with RPN 245 were among the most dangerous units and hazards identified in the industry. In all units except one unit, the ratio of the cost of accidents to prevention varied from 1.2 to 25.
Conclusion: The results showed that it is necessary to consider the correction of the important risks by the industry officials, according to the set priorities so that potential accidents caused by these risks are minimized. This prioritization can play an effective role in optimal risk management and reduce related costs.
Alireza Bakhtiyari, Behrouz Akbari-Adergani, Parisa Shavli-Gilani, Liela Karami, Najmeh Yazdanfar, Parisa Sadighara,
Volume 17, Issue 1 (6-2024)
Abstract
Background and Objective: Given the crucial role of milk and its products in human diets, it is imperative to implement effective measures to ensure the safety of milk by minimizing the presence of hazardous pollutants. This study aims to assess the concentration and potential risks associated with lead in raw milk produced in Tehran province.
Materials and Methods: This cross-sectional descriptive study involved the collection of raw milk samples from 24 diverse livestock farms in Tehran province during the winter season of 1401. The samples were analyzed for lead contamination using flame atomic absorption spectrometry. Statistical tests were applied to compare the results with international standards, and subsequent risk assessment was conducted based on the average amounts.
Results: The study revealed that none of the samples exceeded the permissible limit for lead. The mean and standard deviation of lead concentration in the samples was 7 ± 5.8 (ppb), well below the international standard. There was no significant variation in lead levels among the tested livestock farms. The Hazard Quotient (HQ) values for both children and adults were calculated to be less than 1.
Conclusion: The concentration of lead in all samples remained below the permissible limits set by Codex and the Iran Standards Organization, indicating no non-carcinogenic risks associated with milk consumption in terms of lead contamination, as suggested by the calculated HQ values.
Yeganeh Mazaheri, Farangis Marboutian, Saeed Aghebat-Bekheir, Alireza Bakhtiari, Behrouz Tajdar-Oranj, Behrouz Akbari-Adergani,
Volume 18, Issue 1 (5-2025)
Abstract
Background and Objective: Benzoate and sorbate are utilized to prevent the growth of microorganisms and to extend the shelf life of most food products. However, according to national hygienic regulations, the use of these two preservatives in kefir is not permitted. In this study, the concentration of these preservatives in kefir was determined using high-performance liquid chromatography. Additionally, due to the importance of this issue and compliance with national regulations—which specify a maximum ethanol limit of 0.5% in kefir—the ethanol content of this product was also determined using the gas chromatography method.
Materials and Methods: In this descriptive-cross-sectional study, 88 samples of industrially produced kefir from different brands were randomly collected from various regions of Iran and sent to the laboratory at 4 °C. Statistical analysis of the data was performed using SPSS software, and one-way ANOVA was applied to compare the mean values. In all tests, a significance level of 0.05 was considered.
Results: Sorbate was not detected in any of the samples, while benzoate was observed in only 11 samples, with an average concentration of 0.6763 mg/L. The average concentration of ethanol was 0.2997%, and in 10 samples, the ethanol content exceeded 0.5%, which is in violation of national regulations.
Conclusion: The presence of trace amounts of sorbate in the product may be attributed to the activity of lactic acid bacteria. The increase in alcohol percentage could also be due to insufficient control over the fermentation process during production. To improve nutritional quality and safeguard consumer health, it is recommended that limits be established for preservatives in this product.
Kiandokht Ghanati, Amirali Aghamohammadi, Nader Akbari, Gazal Mirzaei, Mahsa Karimi-Sarzameleh, Mohammad Hadi Dehghani, Parisa Sadighara,
Volume 18, Issue 2 (9-2025)
Abstract
Background and Objective: A large amount of waste is generated from shrimp farming, primarily consisting of shrimp heads and shells. These wastes are often discharged into aquatic environments, where they act as pollutants and threaten the survival of other aquatic organisms. Therefore, reusing shrimp waste can help reduce water pollution and mitigate its environmental impact.
Material and Methods: In this study, carotenoids from shrimp waste were extracted using three methods: acidic, enzymatic, and alkaline. The amount of carotenoids was quantified for each extraction method. Their antioxidant effects on crude sunflower oil, in the presence of copper sulfate, were then evaluated using the TBARS assay. In this method, malondialdehyde levels are measured as an indicator of lipid oxidation. For this purpose, equal amounts of the extracted carotenoids were added to crude sunflower oil along with copper sulfate and placed on a shaker for 24 hours. Subsequently, the malondialdehyde content was measured.
Results: The highest carotenoid yield was obtained using the alkaline extraction method. In the TBARS assay, the alkaline method also demonstrated the greatest inhibition of lipid peroxidation in the presence of copper sulfate.
Conclusion: It can be concluded that the alkaline method is a simple and cost-effective approach for extracting carotenoids from shrimp waste. These carotenoids are bioactive and valuable compounds with potential applications in the pharmaceutical and food industries.
