Search published articles


Showing 4 results for Zarabi
Servey  Impact of  Activated Alumina in Fluoride Concentration Peresent in Water and Appointment Adsorption Isotherm and Kinetics
M.t Samadi, R Nourozi, S Azizian, Y Dadban Shahamat, M Zarabi,
Volume 2, Issue 3 (25 2009)
Abstract

Backgrounds and Objectives: Determination of Fluoride in drinking water has received increasing interest, duo to its beneifical and detrimental effects on health. The aim of this research is investigation of Effect of  activated alumina in fluoride concentration reduction in drinking water.
Materials and Methods: Expriment in batch system and with change effective parameters such as pH(5, 7,9), equilibration time (30, 60, 90, 120 minute), initial fluoride concentration(1.4, 2, 2.4 mg/l) and activated Alumina dosage (0.1, 0.2, 0.3 gr/l) was investigated. Also found data of this research were fited with Langmuir and Freundlich models, kinetic data with pseudo- first order, pseudo- second order and modifited pseudo- first order  models.
Results: The results showed that with increasing of pH of solution, removal efficiency was decreased and optimum pH was found to be in the range of 5 to 7. Also removal efficiency of fluoride was increased with increasing of adsorbent dosage and decreasing of initial concentration of fluoride. Adsorption isotherm data show that the fluoride sorption followed the Langmuir model (r2=0.98). Kinetics of sorption of fluoride onto Activated alumina was well described by pseudo- second order model.
Conclusion: The concentration of Activated Alumina had significant effect on the reduction of fluoride ions concentration in water.The higher fluoride removals were observed for batch experiments at pH=5 because no free fluoride ion is present in the solutions, and it could be casued by electrostatic interactions between the surface of alumina and the dominant fluoride species in solution The kinetic model can adequately describe the removal behaviors of fluoride ion by alumina adsorption in the batch system.


 Investigation of Iron Powder, Hydrogen Peroxide and Iron Hydrogen Peroxide for Removal of Acid Yellow  Powder 36 Dye from Aqueous Solutions
A.r Yazdanbakhsh, A Sheikh Mohammadi, M Sardar, H Mohammadi, M Zarabi,
Volume 2, Issue 4 (9 2010)
Abstract

Backgrounds and Objectives: A great part of organic compounds cause more pollution in natural  waters meet, are chemical dye material. Azo dyes have more usage in different industries. Azo dyes not only give undesirable dye to the water but also have mutation potential and carcinogenesis effects in human and cause the production of toxic substances in water environments.The purpose of this study is investigation of iron powder, hydrogen peroxide and iron powder-hydrogen peroxide processes in removal of acid yellow 36 dye from aqueous solutions.
Materials and Methods: This study was conducted in laboratory scale. At this experiment synthetic solution was made from acid yellow 36 dye, and the removal of acid yellow 36 dye was studied by iron powder, hydrogen peroxide and iron powder- hydrogen peroxide processes .Also effect of dye concentration, pH solution, hydrogen peroxide concentration, iron powder concentration and the time of contact on decolorization, were evaluated.
Results: The results showed that iron powder - hydrogen peroxide process, compared to two other  process has high decolorization power. Removal efficacy of iron powder-hydrogen peroxide process with H2O2 =23.33 ml / L, pH =3, iron powder 2000 mg/L and 60 minute ,was about 97.9%
Conclusion:In general this investigation showed that , this method (Iron powder-hydrogen peroxide process) has high efficiency for removal of Azo dyes. But application this method in the industry, should be economically evaluated.


Equilibrium and kinetic investigation of solophenyl dye removal from aqueous solution using cellulose adsorbents
Hanieh Mirbolooki, Shahriar Mahdavi, Eisa Solgi, Babak Razdar, Mahboubeh Zarabi, Davoud Akhzari,
Volume 17, Issue 4 (3-2025)
Abstract
Background and Objective: Dyes are among the most widespread pollutants found in industrial wastewater. The aim of this study is to investigate the potential of vineyard wood waste as a green adsorbent for the removal of polyazo solophenyl dye from aquatic environments.
Materials and Methods: In this laboratory research, two forms of adsorbents modified with H₂SO₄ and NaOH were used. Data obtained from dye adsorption in synthetic solutions were fitted to isotherm, kinetic, and thermodynamic models, with all calculations performed using Excel software. Zeta potential analysis, along with FTIR, BET, and FESEM-EDS instrumental analyses, was conducted to determine the properties of the adsorbent. Additionally, the desorption rates of the adsorbents were analyzed.
Results: The results showed that the highest color removal efficiency for the adsorbent modified with H2SO4 was achieved at a contact time of 180 minutes and a reaction temperature of 50 °C, while for the adsorbent modified with NaOH, the highest efficiency was observed at a contact time of 105 minutes and a reaction temperature of 25 °C. For both adsorbents, the optimal pH was 4, and the optimal adsorbent dosage was 1 g. The adsorption data for both modified adsorbents followed the pseudo-second-order kinetic model, while the equilibrium data aligned with the Freundlich and Temkin isotherm models. The adsorption capacities were found to be 22.27 mg/g and 9.87 mg/g for the adsorbents modified with acid and base, respectively, under optimal conditions.
Conclusion: This study introduces a novel, low-cost adsorbent derived from natural waste for water pollution removal, transforming the current approach into a cost-effective and eco-friendly solution.
 

Assesing the impact of environmental management and integrated methods on controlling Aedes aegypti mosquito abundance in Chabahar, Iran: a field study
Parviz Yarahmadzahi, Fatemeh Momeniha, Abdolreza Mirolyaei, Abbas Balouchi, Mehrdad Zarabi, Danial Raisi, Abdolrasoul Khedmati, Faramarz Mobaraki,
Volume 18, Issue 3 (12-2025)
Abstract
Background and Objective: Aedes aegypti is a significant vector for the transmission of several dangerous arboviral diseases, including dengue fever, Zika, chikungunya, and yellow fever. The present study aimed to investigate the impact of environmental management and integrated methods on the control and reduction of Aedes aegypti mosquito abundance in Chabahar City in 2024.
Materials and Methods: To conduct this field study, a comprehensive environmental improvement program—based on Ministry of Health guidelines—was developed for Chabahar City to enhance integrated management measures for combating Aedes aegypti. This was accomplished by having environmental health, community health, and entomology experts complete relevant checklists during urban block surveys.To conduct this field study, a comprehensive environmental improvement program-based on the guidelines of the Ministry of Health- was developed for Chabahar City to enhance integrated environmental management measures for combating Aedes aegypti. This was accomplished by having environmental health, community health, and entomology experts complete relevant checklists during urban block surveys.
Results: The results of this study demonstrated that, following environmental improvement operations and chemical control measures in Chabahar City—and coinciding with the beginning of the cold season at the end of 1403 (2024)—the number of probable dengue fever cases declined sharply. Cases fell from a peak of 389 in November 2024 to only 8 by March 2025. This decline indicates the effectiveness of the implemented Aedes aegypti control strategies, potentially in conjunction with seasonal temperature changes.
Conclusion: Given the high prevalence of certain arboviral diseases transmitted by Aedes aegypti in neighboring countries and the continuous movement of residents in these regions, it is critical to plan and implement an immediate vector surveillance and control program to prevent the permanent establishment of this invasive mosquito species.
 

Page 1 from 1     

© 2026 , Tehran University of Medical Sciences, CC BY-NC 4.0

Designed & Developed by: Yektaweb