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Evaluation of antioxidant enzymes activities and identification of intermediate products during phytoremediation of an anionic dye(C.I. Acid Blue 92) by pennywort(Hydrocotyle vulgaris)

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Journal of Environmental Sciences 2013年第11期25卷 2214-2222页

作者： fatemeh Vafaei Ali Movafeghi Alireza Khataee Department of Plant Biology Faculty of Natural Sciences University of Tabriz Research Laboratory of Advanced Water and Wastewater Treatment Processes Department of Applied ChemistryFaculty of Chemistry University of Tabriz

The potential of pennywort （Hydrocotyle vulgaris） for phytoremediation of C.I. Acid Blue 92 （AB92） was evaluated. The effects of various experimental parameters including pH, temperature, dye concentration and plant weight on dye removal efficiency were investigated. The results showed that the optimal condition for dye removal were pH 3.5 and temperature 25~C. Moreover, the absolute dye removal enhanced with increase in the initial dye concentration and plant weight. Pennywort showed the same removal efficiency in repeated experiments （four runs） as that obtained from the first run （a 6-day period）. Therefore, the ability of the plant in consecutive removal of AB92 confirmed the biodegradation process. Accordingly, a number of produced intermediate compounds were identified. The effect of treatment on photosynthesis and antioxidant defense system including superoxide dismutase, peroxidase and catalase in plant roots and leaves were evaluated. The results revealed a reduction in photosynthetic pigments content under dye treatments. Antioxidant enzyme responses showed marked variations with respect to the plant organ and dye concentration in the liquid medium. Overall, the increase in antioxidant enzyme activity under AB92 stress in the roots was much higher than that in the leaves. Nevertheless, no significant increase in malondialdehyde content was detected in roots or leaves, implying that the high efficiency of antioxidant system in the elimination of reactive oxygen species. Based on these results, pennywort was founded to be a capable species for phytoremediation of AB92-contaminated water, may be effective for phytoremediation dye-contaminated polluted aquatic ecosystems.

关键词： phytoremediation anionic dye Hydrocotyle vulgaris antioxidant enzymes photosynthetic pigments

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Impact of modified electrodes on boosting power density of microbial fuel cell for effective domestic wastewater treatment:A case study of Tehran

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燃料化学学报 2017年第7期45卷 871-879页

作者： fatemeh Nourbakhsh Mohammad Pazouki Mohsen Mohsennia Department of Chemistry University of Kashan Department of Energy Institute of Materials and Energy (MERC) Nanoscience and Nanotechnology Institution University of Kashan

Utilizing microbial fuel cells( MFCs) is a promising technology for energy-efficient domestic wastewater treatment,but it still faces practical barriers such as low power generation. In this study,the LaMnO_3 perovskite-type oxide nanoparticles and nickel oxide/carbon nanotube/polyaniline( NCP) nanocomposite( the cathode and anode catalysts,respectively) have been prepared and used to enhance power density of MFC. The prepared La-based perovskite oxide catalysts were characterized by X-ray diffraction( XRD) and scanning electron microscopies( SEM). The electrocatalytic properties of the prepared catalysts were investigated through cyclic voltammetry( CV) and electrochemical impedance spectroscopy( EIS) and Tafel plot at ambient temperature. Results show the exchange current densities of LaMnO_3/carbon cloth cathode and NCP nanocomposite/carbon cloth anode were 1.68 and 7 times more compared to carbon cloth cathode,respectively. In comparison to the bare carbon cloth anode,the MFC with the modified electrodes shows 11 times more enhancement in power density output which according to electrochemical results,it can be due to the enhancement of the electron transfer capability. These cathodic and anodic catalysts were examined in batch and semicontinuous modes to provide conditions close to industrial conditions. This study suggests that utilizing these low cost catalysts has promising potential for wastewater treatment in MFC with high power generation and good COD removal efficiency.

关键词： carbon nanotube nickle oxide La-based perovskite oxide semi-continuous mode

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Improved CO2 capture performances of ZIF-90 through sequential reduction and lithiation reactions to form a hard/hard structure

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Frontiers of Chemical Science and Engineering 2020年第3期14卷 425-435页

作者： Mahboube Ghahramaninezhad fatemeh Mohajer Mahdi Niknam Shahrak Department of Chemical Engineering Quchan University of TechnologyQuchan 94771-67335Iran

Post-synthetic functionalization or modification has been regarded as a promising strategy to treat surfaces of adsorbents for their applications in targeted adsorption and separation *** this work,a novel microporous adsorbent for carbon capturing was developed via functionalization of zeolitic imidazolate framework-91(ZIF-91)to generate a hard/hard(metal-oxygen)structure named as lithium-modified ZIF-91(ZIF-91-OLi compound).To this purpose,the ZIF-91 compound as an intermediate product was achieved by reduction of ZIF-90 in the presence of NaBH4 as a good reducing ***,acidic hydrogen atoms in the hydroxyl groups of ZIF-91 were exchanged with lithium cations via reaction of n-BuLi compound as an organo lithium agent through an appropriate *** particular,the as-synthesized ZIF-91-OLi operated as an excellent electron-rich center for CO2 adsorption through trapping the positive carbon centers in the CO2 *** calculations revealed that the presence of lithium over the surface of ZIF-91-OLi adsorbent plays an effective role in double enhancement of CO2 storage via creating a strong negative charge center at the oxygen atoms of the imidazolate linker as a result of the lithium/hydrogen exchange ***,the selectivity of CO2/N2 was investigated at different temperatures,revealing the ZIF-91-OLi as a selective adsorbent for industrial application.

关键词： hard/hard structure acidic hydrogen ZIF-91 carbon capture ZIF-91-OLi

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Microstructures, hardening and tribological behaviors of tin matrix composites reinforced with SiC and Zn particles

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Rare Metals 2021年第9期40卷 2584-2592页

作者： fatemeh Ghasemi Mohammad Moazami-Goudarzi Hamidreza Najaﬁ Department of Materials Engineering Science and Research BranchIslamic Azad UniversityTehran ***Iran

In order to strengthen pure tin and improve its dry sliding resistance, Sn/SiC and Sn/Zn composites were fabricated via a powder metallurgy route. Microstructure,hardness and pin-on-disk wear resistance of pure tin and the fabricated composites were compared to those of Sn–7.5 Sb–3.5 Cu Babbitt alloy. The dominant wear mechanism at different applied loads was determined by analyzing worn surfaces and wear debris in each case. The results showed that the hardening effect of Zn was much higher than that of SiC. The hardening role of Zn in the tin matrix was ascribed to the direct load transfer mechanism. Microscopic studies of the worn surfaces revealed that the pure tin was susceptible to surface fatigue wear and plowing damage, depending on the normal load applied during the wear test. In the case of Sn/SiC composite and the Babbitt alloy, delamination wear mechanism resulting from subsurface crack propagation controlled the wear rate. While the highest hardness and the lowest coefficient of friction were obtained for the Babbitt alloy, the Sn/Zn composite exhibited the highest wear resistance at a constant applied load, indicating the importance of asperity contact type in the wear process.

关键词： Tin matrix composites Babbitt alloy Microstructure Hardening mechanisms Wear behavior

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H_3PMo_(12)O_(40) catalyzed three-component one-pot synthesis of 4,6-diarylpyrimidin-2(1H)-ones under solvent-free conditions

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Chinese Chemical Letters 2010年第3期21卷 269-272页

作者： Zeinab Pourghobadi fatemeh Derikvand Department of Chemistry Islamic Azad University-Khorram Abad Branch

4,6-Diarylpyrimidin-2(1H)-one derivatives have been synthesized from three-component one-pot condensation of acetophe-none derivatives,aldehydes and urea in the presence of trimethylsilyl chloride and a catalytic amou... 详细信息

关键词： 4 6-Diarylpyrimidin-2(1H)-ones H_3PMo_(12)O_(40) Solvent-less reactions Biginelli like reactions Heteropolyacids

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The SBA-15/SO_3H nanoreactor as a highly efficient and reusable catalyst for diketene-based,four-component synthesis of polyhydroquinolines and dihydropyridines under neat conditions

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Chinese Chemical Letters 2013年第5期24卷 401-403页

作者： Sadegh Rostamnia fatemeh Pourhassan Organic and Nano Group(ONG) Department of ChemistryFaculty of ScienceUniversity of Maragheh

An efficient diketene ring-opening synthesis of polyhydroquinoline derivatives using SBA-15 sulfonic acid modified mesoporous substrates a green and reusable catalyst in a single-pot four-component coupling reaction of diketene,alcohol,enamine,and aldehydes is *** derivatives based on neat adduct of diketene,alcohols and aldehydes using SBA-15/SO_3H nanoreactor as catalyst via a four-component reactions are also *** advantages of the present method include the use of a small amount catalyst,simple procedure with an easy filterable work-up,waste-free,green and direct synthetic method with an excellent yield of products with efficient use of catalyst and a short reaction time.

关键词： SBA-15/SO3H Nanoreactor Diketene Polyhydroquinoline

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Sediment pattern&rate of bathymetric changes due to construction of breakwater extension at Nowshahr port

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Journal of Ocean Engineering and Science 2021年第1期6卷 70-84页

作者： Farhad Sakhaee fatemeh Khalili School of Engineering Parks College of EngineeringAviation and TechnologySaint Louis UniversityUSA Saroyeh Institute of Higher Education Civil Engineering Dept.MazandaranSariIran

Erosion,scour and sedimentation are the most common phenomena which should be considered in the design of marine *** and oceans are dynamic environments,hence studying them in more details,gathering more information about their bathymetric changes and pursuing their historical evolution could be beneficial in the efficient design of marine structures such as:jetties,groins and *** achieve this goal one desperately needs to know about currents and waves and the effects of their interactions as well as the rate of sedimentation(Net Gain),and erosion(Net Loss)in the *** the other hand,to obtain a sufficient depth to facilitate marine traffics in the harbors the rate of sediment deposition must be calculated,offering effective annual dredging *** this research the pool of Nowshahr port and some parts to the east and west were *** transport direction was compatible with the counter-clock-wise circulation of the Sothern part of Caspian *** data,water surface elevation,and hydrographic points from the bathymetric surveys applied in the hydrodynamic module of Mike 21 and the output of the hydrodynamic module(HD)were used as inputs for sediment transport module(ST).The result of the ST module shows that the main direction considering dominant waves is from northwest of the Caspian Sea to the ***,net rate of sediment transfer is from west to *** approaching to the main breakwater arms from the west side sediment transport rate decreases which means deposition occurs behind the western arm.

关键词： Numerical modeling Sediment pattern Wave and currents Erosion Nowshahr port

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A review of design considerations in glass buildings

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Frontiers of Architectural Research 2016年第2期5卷 171-193页

作者： fatemeh Pariafsai Department of Sheikh Sadough Islamic Azad University of Shahr Rey Tehran Iran

In the past few decades, the use of glass in buildings has remarkably increased. As a result, several transparent buildings have been constructed, in which the materials have almost disappeared. Given that the advancement of architecture is inextricabty tinked to the acquisition of general knowledge on future developments, this study was conducted to predict the paths of development that glass structures are likely to take in the future. Investigations such as this increase the possibility of advancing both design and construction at the same speed as technology. To achieve this goal, this study evaluates the present situation by investigating new possibilities and assessing their effect on the development of glass buildings. The findings of this study show that the durability, safety, appearance, and efficiency of transparent buildings can be improved through continuous refinement of designs, replacement of aged elements, prompt repair of damaged protective coatings, and greater exploitation of double-sided screens.

关键词： Transparent building Grass structure Shell Adhesive Setf-heating

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Evaluation of Different Predictor Models for Detailed Soil Particle-Size Distribution

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Pedosphere 2018年第1期28卷 157-164页

作者： fatemeh MESKINI-VISHKAEE Naser DAVATGAR Soil and Water Research Department Khuzestan Agricultural and Natural Resources Research and Education Center Agricultural Research Education and Extension Organization (AREEO) Soil and Water Research Institute Agricultural Research Education and Extension Organization (AREEO)

An accurate mathematical representation of soil particle-size distribution(PSD) is required to estimate soil hydraulic properties or to compare texture measurements using different classification systems. However, many databases do not contain full PSD data,but instead contain only the clay, silt, and sand mass fractions. The objective of this study was to evaluate the abilities of four PSD models(the Skaggs model, the Fooladmand model, the modified Gray model GM(1,1), and the Fredlund model) to predict detailed PSD using limited soil textural data and to determine the effects of soil texture on the performance of the individual PSD *** mean absolute error(MAE) and root mean square error(RMSE) were used to measure the goodness-of-fit of the models, and the Akaike's information criterion(AIC) was used to compare the quality of model fits. The performance of all PSD models except the GM(1,1) improved with increasing clay content in soils. This result showed that the GM(1,1) was less dependent on soil *** Fredlund model was the best for describing the PSDs of all soil textures except in the sand textural class. However, the GM(1,1) showed better performance as the sand content increased. These results indicated that the Fredlund model showed the best performance and the least values of all evaluation criteria, and can be used using limited soil textural data for detailed PSD.

关键词： Akaike's information criterion Fredlund model Gray model mean absolute error root mean square error soil texture

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Density,refractive index and liquid–liquid equilibrium data of polyethylene glycol 3000 + potassium formate + water at different pH values

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Chinese Journal of Chemical Engineering 2018年第1期26卷 168-174页

作者： fatemeh Ahmadi Mohsen Pirdashti Abbas Ali Rostami Chemical Engineering Department Faculty of EngineeringShomal University

New liquid-liquid equilibrium data for polyethylene glycol （PEG） 3000 ＋ CHO2K ＋ H20 systems were measured at 298.15 K and pH values of 7.95, 8.40 and 9.98. It was found that an increase in pH caused the binodal curve to be displaced downward and the two-phase region to expand. Accordingly, the binodal curve was adjusted to the Pirdashti equation and the tie-line compositions were correlated using the Othmer-Tobias, Bancroft and Hand equations. The study measured the refractive index and densities of several homogeneous binary and ternary solutions. The solutions were used for calibration within a range of 0% to 30% of the mass of the PEG and potassium formate. The density and refractive index data show a linear variation with the mass fraction of the polymer and the salt. The effect of pH on the binodal, tie-line lengths （TLL） and slope of the tie-line （STL） in the systems was exam- ined. It was found that an increase in pH increased the TLL and decreased the STL It was observed that the density of the aqueous two-phase system was influenced by the TLL The difference in density between phases （△p） increased as the TLL and pH increased. It was found that the TLL and Ap showed a linear relationship. The effective excluded volume （EEV） of the PEG was obtained and it was found that EEV also increased as the pH increased.

关键词： Liquid-liquid equilibrium data Density Polyethylene glycol Potassium formate

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