Showing 5 results for Iravani
Elnaz Iravani, Mohammadhadi Dehghani, Amirhossein Mahvi, Noushin Rastkari,
Volume 6, Issue 2 (9-2013)
Abstract
Background and objectives: Bisphenol A (BPA) is an endocrine disrupting chemical that releases to the environment through effluents of its producing factory, pulp and paper mill factories, and plastics industry. The purpose of this study was to investigate adsorption isotherms of removing BPA from aqueous solutions using single walled carbon nanotubes (SWCNTs).
Materials and methods: This study was an empirical investigation. Our experiments were conducted discontinuously using 50 mL of sample in each test. The variables of this study were the contact time (5, 15, 30, 60, 90, 120 min), the initial concentration of BPA (2, 5 , 20, 50 mg/L), and pH (3, 5, 6, 9, 11). The concentrations of BPA were measured using UV-Vis spectrophotometer.
Results: The maximum adsorption capacity was found to be 71.42 mg/g. The results of our experiments showed that maximum adsorption capacity at equilibrium was achieved at t = 60 min and pH = 9. Moreover, increasing the initial concentration is associated with an increase in adsorption capacity until it becomes constant.
Conclusion: The BPA adsorption on SWCNT follows Freundlich-Langmuir isotherm.
N Golchinpour, N Rastkari, R Nabizadeh Nodehi, M Abtahi, A Azari, E Iravani, K Yaghmaeian,
Volume 10, Issue 4 (3-2018)
Abstract
Background and Objective: Triclosan is one of the substances as anti-microbial that is used in many of these pharmaceutical products. This compound can affect human such as reduction of thyroid hormone levels, antibiotic resistant, and increasing skin cancer. This study evaluated the performance nanophotocatalysis process UV/Xe/TiO2-GO on triclosan removal from aqueous solutions.
Materials and Methods: Synthesis of TiO2@GO and its structure was analyzed by SEM, EDX and FTIR. The effects of pollutant concentration, catalyst dosage, and contact time on the removal of Triclosan were studied by DOE software according to response surface methodology. Analysis of variance test was considered for the influence of parameters. Optimum process condition was determined by desirability factor.
Results: Optimum conditions regarding concentration of pollutant, contact time, and catalyst dosage were determined as 0.205 g/L, 14.898 min, and 0.487 mg/L, respectively. Maximum removal efficiency in optimum condition was 97.542 percent. The catalyst dosage was the most effective parameter in removal of Triclosan.
Conclusion: Using of TiO2@GO and xenon lamp had acceptable efficiency for the removal of Triclosan. The use of Xenon lamps alone was economically affordable.
Ar Mesdaghinia, S Nasseri, M Hadi, E Iravani, M Askari,
Volume 10, Issue 4 (3-2018)
Abstract
Background and Objective: Supply of safe drinking water to each community is one of the most important challenges in improving the general community’s health. Considering the importance of the research on water quality, identification of water quality research gaps was performed by reviewing the relevant studies through a systematic review for Iran.
Materials and Methods: In this study 638, 166, 300 and 1000 relevant articles were found on Scopus, SID, Magiran and Iranmedex databases, respectively. Out of 2104 articles, 1394 articles were excluded from the study. Finally, 710 articles were further reviewed.
Results: Monitoring of pollutants by a descriptive study was the main objective of the most studies (36.62%). Around 13% of the studies were performed on a laboratory scale. Organic pollutants in Iran have been concerned only in 17 provinces, and other provinces have not participated in this regard. Nitrate is studied in around one fifth of the total studies. Heavy metals were also considered as a parameter of concern in the studies carried out on monitoring drinking water resource quality.
Conclusion: This study reflects the research gaps and provides a basis for prioritizing water quality research in Iran. More actions and sound planning should be taken to monitor organic and inorganic pollutants. Chemical and microbial risk assessment, tracing the fate of pollutants and assessment of their ecological effects, investigations on advanced water purification processes, the use of bioremediation methods, identification of biological contaminant using biomarkers and molecular identification techniques are the most important research priorities that require more investigations.
Mahdi Hadi, Alireza Mesdaghinia, Simin Nasseri, Elnaz Iravani,
Volume 13, Issue 4 (2-2021)
Abstract
Background and Objective: The bibliometric analysis is the most effective way to study the scientific output and trend of research. The purpose of this study is to analyze the scientific output of the Institute of Environmental Research (IER) at Tehran University of Medical Sciences using bibliometric technique.
Materials and Methods: All related IER articles that have been indexed in Scopus and WoK were retrieved from the beginning of 2009 till November 23, 2019. The bibliometric data were extracted and analyzed using R software.
Results: The document production follows an increasing exponential trend with a rate of 10% per year. 807 documents were retrieved with an average citations of 19.26 per each document. The documents per author and authors per document were obtained 0.196 and 5.1, respectively. The highest citations to documents was in 2017 (35.5 citations). The most frequent keywords were found “Adsorption”, “Drinking water”, “Air pollution”, “Particulate matter”, “Risk assessment” and “Response surface methodology”. Thus, engineering-based studies are more prominent in the published studies. Health-based studies, including risk assessment studies, accounted for the most area of research. The largest numbers of international research collaboration were recorded with the United States, Switzerland, Canada and India. While, in the national scale, Shahid Beheshti University of Medical Sciences’ collaboration was prominent.
Conclusion: It is still necessary to promote the level of the IER’s international collaborations to raise its regional status. In addition, more attention should be paid to health-based topics like risk assessment studies. These studies need to be given higher priority in the action plan of the IER’s centers and research groups.
Mahdi Hadi, Maryam Hashemkhani, Elnaz Iravani,
Volume 15, Issue 2 (8-2022)
Abstract
Background and Objective: Researchers investigate and identify the gaps and frequency of studies related to specific knowledge by using scientometrics. The purpose of this study was to analyze the trend of scientific research in the field of climate change in Iran.
Materials and Methods: All articles affiliated with Iran in the field of climate change have been cited in Scopus databases from 1991 to December 9, 2019, and were retrieved by using keywords like "climate change", "global warming", "global change", "climate variability", "greenhouse gas". The data were analyzed using R software.
Results: The total number of documents was 2253. The trend of document production in the field of climate change in Iran follows an increasing exponential trend. Iran's collaboration with other countries in the field of climate change studies was significant so around 25% of scientific productions have been produced jointly with other countries. Keywords analysis showed a greater frequency for keywords including “downscaling”, “energy”, “global warming” and “uncertainty”. However, despite the importance of issues such as “adaptation” and “vulnerability” concerning climate change in Iran, the frequency of these keywords in climate change studies in Iran is low.
Conclusion: Based on the results of this study and considering the importance of climate change and its effects on the country, also the importance of greenhouse gases including CO2, and the rank of Iran as the eighth country in the emission of these gases, it is recommended to pay more attention to issues such as “vulnerability”, “adaptability”, analysis of “greenhouse gases production”, “management of energy consumption” and the use of “renewable energies” in future studies.
