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RISS 인기검색어
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- 저자 : Esmaeil Babanezhad (검색결과 3 건)
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( Meysam Sadeghi ),( Sina Yekta ),( Esmaeil Babanezhad ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.5
Magnetite nanoparticles (Fe3O4 NPs) were synthesized by co-precipitating method under optimized condition. The Fe3O4 NPs coated with sodium dodecyl sulfate-thenoyltrifluoroacetone (Fe3O4 NPs-SDS-TTFA) were then exerted as the magnetic solid phase extraction (MSPE) adsorbent for the extraction process prior to introducing to a flame atomic adsorption spectrometry (FAAS). The synthesized Fe3O4 NPs-SDS-TTFA were applied for the extraction of Pb(II) ions from different water samples. The characterization studies of nanoparticles were performed via scanning electron microscopy-energy dispersive micro-analysis (SEM-EDAX), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM) techniques. The substantial parameters affecting the extraction efficiency were surveyed and optimized. A dynamic linear range (DLR) of 10-400 μg L-1 was obtained and the limit of detection (LOD, n=7) and relative standard deviation (RSD%, n= 6, C=20 μg L-1) were found to be 2.3 μg L-1 and 1.9%, respectively. According to the results, the proposed method successfully applied for the extraction of Pb(II) ions from different environmental water samples and satisfactory results achieved.
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Mohammad Ali Zazouli,Zabihollah Yousefi,Esmaeil Babanezhad,Alireza Ala 대한환경공학회 2023 Environmental Engineering Research Vol.29 No.3
This study evaluated a novel municipal solid waste leachate (MSWL) treatment system called the Batch flow leachate treatment system (BFLTS). This process uses a combination of coagulation/flocculation (C-F), advanced oxidation (sulfate-hydroxyl radical), and extended aeration of activated sludge (EAAS) to treat MSWL. The results indicated that the primary treatment phase using coagulation/flocculation with 0.8 g L<SUP>-1</SUP> FeCl₃ at pH 6 achieved 67% turbidity and 63% chemical oxygen demand (COD) reduction. The secondary treatment phase with the presence of both K₂S₂O<SUB>8</SUB> and H₂O₂ peroxides was more efficient than single peroxide processes. While PS-based or H₂O₂-based single peroxide processes are less effective (UV-PS 65.7%, UV-H₂O₂ 43.2%, Heat-PS 58.6%, Heat-H₂O₂ 34.5%, and Heat-PS/H₂O₂ 74.8%). The UV-PS/H₂O₂ system achieved the highest COD removal rate of 89.4%. In the third treatment phase, the efficient removal of COD and Biochemical oxygen demand (BOD) under optimal operating conditions was 87.3% and 94.7% respectively. Overall, the BFLTS treatment system has demonstrated high efficiency in removing COD, BOD, TSS, Turbidity, TKN, and Heavy metals by 99%, 98%, 97%, 89%, 86%, and 98%, respectively. This hybrid process has potential for reducing organic load in MSWL and can be used for various leachates.
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The potential of common duckweed (Lemna minor) in phytoremediation of phenanthrene and pyrene
Mohammad Ali Zazouli,Somayeh Asghari,Roshanak Tarrahi,Seyed Yahya Salehi Lisar,Esmaeil Babanezhad,Nafise Dashtban 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.1
The distribution of polycyclic aromatic hydrocarbons (PAHs) as a group of toxic and persistent aromatic pollutants in the environment is rapidly enhancing. These compounds have adverse impacts on the health of living organisms. Hence, in the present study, we investigated the potential of duckweed (Lemna minor) as an aquatic plant species for uptake, accumulation, and biodegradation of phenanthrene and pyrene under controlled conditions. L. minor plants were treated with 10 and 20 mg L<SUP>-1</SUP> concentrations of phenanthrene and pyrene at the experimental duration of ten days. According to the results obtained, the toxicity of phenanthrene and pyrene contaminants on L. minor was influenced by the different initial PAHs concentrations. An increase in phenanthrene and pyrene concentration significantly decreased all studied growth parameters such as fresh weight, dry weight, and RFN and also photosynthetic pigment contents of the plant. Phenanthrene and pyrene concentrations were measured using high-performance liquid chromatography (HPLC) technique after 10 days of exposure to the PAHs. The results revealed that L. minor species could bioaccumulate effectively both typical PAHs. Furthermore, the gas chromatography-mass spectroscopy (GC/MS) technique explained the biological degradation of phenanthrene and pyrene by L. minor in the present research, and accordingly, several intermediate by-products were identified.
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