2024-03-29T09:15:53Z
https://scientiairanica.sharif.edu/?_action=export&rf=summon&issue=1112
Scientia Iranica
Scientia Iranica
1026-3098
1026-3098
2019
26
6
Synthesis and structure-activity relationship of 1-[(E)-3-phenyl-2-propenyl] piperazine derivatives as suitable antibacterial agents with mild hemolysis
M.A.
Abbasi
M.
Nazir
Aziz-ur-Rehman
Aziz-ur-Rehman
S.Z.
SIDDIQUI
S.A.A.
Shah
M.
Shahid
A new series of 1-[(E)-3-phenyl-2-propenyl]piperazine derivatives (5a-m) as antibacterial agents was designed and synthesized. The synthetic strategy was initiated by coupling different anilines (1a-m) with bromoacetyl bromide (2) in aqueous basic medium to acquire different electrophiles, 3a-m, with good yields. These electrophiles were further reacted with 1-[(E)-3-phenyl-2-propenyl]piperazine (4) to yield the desired compounds, N-(substituted)-2-{4-[(E)-3-phenyl-2-propenyl]-1-perazinyl}acetamides (5a-m). The structures of these compounds were established from their IR, 1H-NMR, 13C-NMR, EI-MS and CHN analysis data. The bacterial biofilm inhibitory potential of these piperazine derivatives was tested against two pathogenic strains, Bacillus subtilus and Escherichia coli. Two compounds, 5d and 5h were identified as suitable antibacterial agents. The cytotoxicity of these molecules was profiled through hemolytic assay and it was inferred that all the compounds were nearly harmless for membrane of red blood cells.
1-[(E)-3-phenyl-2- propenyl]piperazine
Bromoacetyl bromide
Amides
Biofilm inhibition
Hemolysis
2019
12
01
3375
3386
https://scientiairanica.sharif.edu/article_21565_39b39656641af9ef0d875858813f90ad.pdf
Scientia Iranica
Scientia Iranica
1026-3098
1026-3098
2019
26
6
A 3D polyoxoniobate-based framework showing performance in dye removal from aqueous solution
B.
safarKoopayeh
A.
Abbasi
A.H.
Mokarizadeh
A.
Shayesteh
M.
Najafi
A polyoxoniobate-based 3D framework [K8H30Nb6O31] (1), was prepared through hydrothermal method and characterized by single crystal X-ray diffraction, powder X-ray diffraction (PXRD), solid state UV-visible and thermogravimetric analysis (TGA). Structure and properties of 1 were investigated with various computational methods. QTAIM and NBO studies together with thermogravimetric analysis suggest strong interactions between potassium ion, Lindqvist hexaniobate and water molecules. Hirshfeld surfaces around the Nb6O198- reveal that the Lindqvist ion acts as a ɳ3 ligand for the alkali cations. One remarkable detail about the structure is the presence of an encaged potassium ion, surrounded by six water molecules and four potassium ions. The prepared polyoxoniobate (PONb) was tested in the removal of diazo dye pollutant in water. The result shows that 1 has good activity and stability during the dye removal process and can be recovered and reused at least for five cycles.
Polyoxoniobate
Dye Removal
X-ray structure
water pollutant
DFT Calculations
QTAIM
2019
12
01
3387
3399
https://scientiairanica.sharif.edu/article_21592_cb7db4cacff0c398b481579395bc3cb8.pdf
Scientia Iranica
Scientia Iranica
1026-3098
1026-3098
2019
26
6
A hybrid model of multi-objective differential evolution algorithm and various decision-making methods to optimize the batch ABE fermentation process
M.H.
Khademi
S.
Zandi Lak
In recent years, biofuels have attracted considerable attention as renewable and clean source of energy and have been playing the role of suitable alternatives to fossil fuels. One of the most attractive types of biofuels is Acetone-Butanol-Ethanol (ABE) which is produced in a batch fermentation process by the anaerobic bacterium Clostridium acetobutylicum and sugar-based substrate as feedstock. In this paper, optimization of this process was carried out according to a bi-objective function. A hybrid model of Multi-Objective Differential Evolution (MODE) algorithm and distinguished decision-making methods, namely Linear programming technique for Multidimensional Analysis of Preference (LINMAP), Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) and Shannon's entropy were applied to find the final optimal operating point. The initial concentration of substrate and the final operating time of the process were selected as decision variables to maximize two main objectives in terms of solvents yield and productivity. A Pareto optimal set presents a wide range of optimal operating points and a proper operating condition can be selected based on the necessities of the applicant. The best optimal point obtained by TOPSIS, according to the lowest value of deviation index, was also compared with the results of economic-based optimization.
ABE fermentation
Clostridium acetobutylicum
optimization
Multi-objective differential evolution
Decision-making method
2019
12
01
3401
3414
https://scientiairanica.sharif.edu/article_21583_68bb1230a5436dcff836e82f706846c4.pdf
Scientia Iranica
Scientia Iranica
1026-3098
1026-3098
2019
26
6
Electrochemical energy conversion realized through Ag@Pt/rGO nano-catalyst enhancing activity of the ORR process in a PEMFC
A.
Esfandiari
M.
Kazemeini
Core-Shell structures of Ag@Pt nanoparticles (NPs) dispersed upon reduced graphene oxide (rGO) support containing different Ag:Pt mass ratios synthesized through the ultrasonic treatment method. These applied to the oxygen reduction reaction (ORR) process in a Proton Exchange Membrane Fuel Cell (PEMFC). The morphology of as-prepared catalysts characterized through High Resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and induced coupled plasma atomic emission spectroscopy (ICP-OES) analyses. The ORR activities and stabilities of catalysts studied through electrochemical measurements of Cyclic Voltammetry (CV) and single cell tests, respectively. The results revealed, prepared Ag@Pt/rGO catalysts possessed a Core-Shell nanostructure and the one with the Ag:Pt mass ratio of 1:3 displayed the largest electrochemical surface area (of 77.6 m2 g-1) as well as; provided the highest stability compared with prepared electrodes containing other Ag:Pt ratios and the obtained commercial Pt/C material. The maximum power density for the MEA prepared with this electrocatalyst determined to be 55% higher than that of the commercial Pt/C evaluated through single cell techniques. Thus, the understudied material seemed to be a very promising cathode for utilizing in PEM fuel cells.
Core-Shell
Electrocatalyst
Oxygen Reduction
PEMFC
reduced graphene oxide
2019
12
01
3415
3430
https://scientiairanica.sharif.edu/article_21560_790799234f4115f8f60b4d1f951212f7.pdf
Scientia Iranica
Scientia Iranica
1026-3098
1026-3098
2019
26
6
Simulation optimization of water-alternating-gas process under operational constraints: A case study in the Persian Gulf
S.
Sadeghnejad
M.
Manteghian
H.
Ruzsaz
Optimizing the efficiency of WAG flooding projects can guarantee the success of these projects. Many operational constraints can indirectly affect the flooding efficiency. Their effects is not normally considered during routine optimizations. The main aim of this study is to find the influence of these constraints (e.g., maximum water-cut, maximum GOR, and minimum BHP during WAG process). Implementing a reservoir simulator coupled with a simulating-annealing (SA) enables us to discover the effects of these constraints during simulation optimizations. The developed optimizer is applied into a case study from an Iranian formation located in the Persian Gulf. The recovery factor of WAG flooding is compared with that of the conventional waterflooding and gas injection. Moreover, the optimization of individual and simultaneous WAG parameters are analyzed. Results indicate that a) operational constraints not also can alter the production mechanism but also they directly affect the ultimate recovery factor; b) the recovery factor of simultaneous optimization of all WAG parameters is higher than that of individual parameter optimization; c) irrespective to the manner of parameter optimization, WAG ratio (or the volume fraction of injected water to gas) remains almost constant during all optimizations, showing the influence of this parameter during WAG flooding scenarios.
Water-Alternating-Gas
EOR
optimization
Simulated annealing
Operational Constraints
2019
12
01
3431
3446
https://scientiairanica.sharif.edu/article_21475_d0d567887e4065f4e245d6a86d7df10c.pdf
Scientia Iranica
Scientia Iranica
1026-3098
1026-3098
2019
26
6
Activated nanoporous carbon from walnut shell as a promising adsorbent for methane storage in adsorbed natural gas technology
A.
Nouralishahi
M.
Bahaeddini
A.
Rashidi
Sh.
Mahinnezhad
A.
Fazeli
AbstractActivated carbon from walnut shell is studied for methane storage in this research. The samples are synthesized by zinc chloride and phosphoric acid, as activating agents. The effect of physical activation, after chemical activation steps, on the final structure of the samples and their total methane storage is examined. The results show that physical activation has an improving effect on the total capacity of the samples activated by phosphoric acid, however; it has a reverse effect on the capacity of zinc chloride activated ones. The experimental data show that the best capacity is obtained at impregnation ratios of 0.7 and 1.2 in the case of phosphoric acid and zinc chloride activated samples, respectively. The best sample is the one activated by phosphoric acid with impregnation ratio of 0.7 and subsequently physically activated by carbon dioxide. It has the BET surface area of 1479 m2/g, average pore diameter of 4.2 nm, total pore volume of 0.84 cm3/g and methane adsorption capacity of 159 cm3/g. The sample shows high stability during successive adsorption/desorption cycles experiment.
ANG
Activated Carbon
Methane
Nano-porous adsorbents
Wallnut shell
2019
12
01
3447
3455
https://scientiairanica.sharif.edu/article_21553_b3c8e4f2eb7a4f6d144ff7f83d55332c.pdf
Scientia Iranica
Scientia Iranica
1026-3098
1026-3098
2019
26
6
Reactive extraction of lactic acid using environmentally benign green solvents and a synergistic mixture of extractants
A.
Kumar
A.
Thakur
An environment-friendly reactive extraction method as a novel phase separation technique was postulated to extract lactic acid (LA) from aqueous solution by means of environmentally benign green solvents along with the synergistic mixture of extractants. Reactive extraction of LA has been carried by using synergistic mixture of extractants (trioctylamine (TOA), Aliquat336, and tridodecylamine (TDDA)), organic solvents, and non-toxic and biocompatible green solvents. From the different LA reactive extraction systems investigated, the system having sunflower oil, synergist extractant (TOA and Aliquat336) and Butan-2-ol were found to be the most favourable system. The LA distribution coefficient (KD=27.75±0.22) and extraction efficiency (η=97.17±0.54%) were obtained by a system consisting of LA concentration (0.05 [M]), TOA (15%, v/v), Aliquat336 (15%, v/v), solvent ratio (2.5, v/v), phase ratio (1:1, v/v), agitation speed (100 rpm), and stirring time (120 min). The main driving force for this research work on the LA reactive extraction from aqueous solution was to develop a suitable combination of extractants, organic solvents and natural solvents which possesses high affinity towards LA and also has less toxicity towards LA producing microbes.
Green solvents
Synergistic mixture of extractant
Distribution coefficient (KD)
Reactive extraction
Lactic acid
2019
12
01
3456
3467
https://scientiairanica.sharif.edu/article_21554_ba3d5c959cb42b003997c2b02a3b1812.pdf