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3 results on '"Somayeh Shahsavan"'

1. Optimization of Aqueous Phenol Treatment with Persulfate in the Presence of Iron

Author

somayeh shahsavan, Mehraban Sadeghi, Abdolmajid Fadae, Morteza Sedehi, and Tahere razavi

Subjects
Persulfate/iron Process, Free radicals, Aqueous Environment, phenol, Organic Materials, Technology, Water supply for domestic and industrial purposes, TD201-500, Sewage collection and disposal systems. Sewerage, TD511-780
Abstract

Phenolic compounds are among the priority pollutants due to their adverse effects on human health and other living organisms. Advanced Oxidation Processes (AOPs) offer promising prospects for the removal of pollutants in water and wastewater due to their high efficiency as well as acceptable health and environmental effects. Persulfate, especially when used with iron, is far stronger than many other oxidants with respect to oxidation properties since it produces sulfate radicals which create a higher oxidation potential. In this research, efforts have been made to achieve the best conditions for phenol removal from aqueous environments by activating persulfate with iron ions. The experimental design was accomplished using the Taguchi statistical method and the Minitab 16 software. For the purposes of this study, four factors, each with five levels, were considered to determine the optimal conditions for phenol removal. The optimum conditions for phenol removal by integrated persulfate/iron ions were found to comprise a contact time of 120 minutes, a persulfate/iron molar ratio of 5/4, and PH=3. Phenol removal efficiencies of 94.93%±0.708 and 58.21%±0.675 were obtained under the optimum conditions for the experimental minimum (50 mg/l) and maximum (750 mg/l) phenol concentrations, respectively. The results revealed that among the parameters affecting the process, environmental pH with 54.80% and persulfate concentration with 11.05% have the highest and lowest effects, respectively. It is expected that this process is also capable of removing phenol from industrial wastewaters with removal efficiencies in the range of 59‒95%.

Published
2016

2. Evaluation of sulfadiazine (SDZ) removal from wastewater by persulfate activated with iron sulfate

Author

Mohsen Arbabi, Abdolmajid Fadae, Sara Hemati, Mehraban Sadeghi, and Somayeh Shahsavan

Subjects
Iron sulfate, chemistry.chemical_compound, Sulfadiazine, chemistry, Wastewater, Advanced oxidation process, medicine, Water treatment, Sulfate, Persulfate, High-performance liquid chromatography, Nuclear chemistry, medicine.drug
Abstract

In this study, removal of an antibiotic (SDZ) from wastewater using an advanced oxidation process of persulfate (PS) in the presence of iron sulfate (S2O8 –2/Fe+2) was investigated. The operational variables such as; the effect of pH, contact time, iron and PS ion concentrations and initial concentration of SDZ on the efficiency of SDZ removal was studied. High performance liquid chromatography (HPLC) was used for the analysis and monitoring of SDZ concentration. It was found that the highest rates of SDZ removal were found to be 95.83±1.342%, 87.15±0.929% and 69.09±0.848%, respectively, for initial SDZ concentration of 0.08, 0.2 and 0.4 mmol. The results showed that the S2O8 –2/Fe+2 system would be optimized by contact time of 60 min, pH 4 and iron to PS molar ratio of 1. Therefore, these findings would help to better apply the AOPs to remove recalcitrance pollutants such as SDZ from wastewater.

Published
2018
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3. Study of the impact of combination of ZnO nanoparticles with ultraviolet radiation (photocatalytic process) on the removal of anionic surfactant linear alkyl benzene sulfonate (LAS) from aqueous solutions using Taguchi statistical method

Author

Mehraban Sadeghi, Abdolmajid Fadaei, Tahereh Razavi, and Somayeh Shahsavan markadeh

Subjects
chemistry.chemical_classification, Active ingredient, Aqueous solution, Radical, Inorganic chemistry, chemistry.chemical_element, Ocean Engineering, 02 engineering and technology, Zinc, 010501 environmental sciences, 021001 nanoscience & nanotechnology, 01 natural sciences, Pollution, chemistry, Pulmonary surfactant, Photocatalysis, 0210 nano-technology, Dissolution, Alkyl, 0105 earth and related environmental sciences, Water Science and Technology
Abstract

Surfactants or surface-active agents are molecules with hydrophilic head and hydrophobic tail. They have been widely used as active ingredient in soap and detergent formulations. Detergents are synthetic, organic materials with cleansing and dissolution properties. Among the anionic surfactants, linear alkyl benzene sulfonate (LAS) has the highest consumption and is used in high concentrations in household detergents as washing powders, dishwashing liquids, and other household cleaners. LAS can have an impact of inhibiting the biological activity in the soil, which plays an important role in soil fertility and nutrient cycles. Removing pollutants in advanced oxidation processes is mainly based on producing the hydroxyl free radicals with potential high oxidation as well as the fact that many organic compounds can be converted into minerals. In the past two decades, photocatalyzing by semiconducting materials such as zinc oxide (ZnO) has received much attention due to its high sensitivity, high sta...

Published
2016
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