eng
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
2020-06-01
27
3
1207
1215
10.24200/sci.2020.54123.3607
21723
N-(2-pyridylmethyl)-L-histidine functionalized Fe3O4 magnetic nanoparticles as an efficient catalyst for synthesis of β-amino ketones
M. Zirak
m.zirak@pnu.ac.ir
1
Z. Bahrami
z.bahrami.chemist@gmail.com
2
O. Buyukgungor
orhanb@omu.edu.tr
3
B. Eftekhari-Sis
eftekharisis@maragheh.ac.ir
4
Department of Chemistry, Payame Noor University, Tehran 9395-3697, Iran
Department of Chemistry, University of Maragheh, Maragheh 55181-83111, Iran
Department of Physics, Ondokuz Mayis University, TR-55139, Samsun, Turkey
Department of Chemistry, University of Maragheh, Maragheh 55181-83111, Iran.; Department of Chemistry, Sharif University of Technology, Tehran, Iran.
N-(2-Pyridylmethyl)-L-histidine functionalized Fe3O4 magnetic nanoparticles (PMHis@Fe3O4 MNPs) efficiently catalyzed three-component Mannich-type reaction of ketones, aromatic aldehydes and anilines, to synthesize β-amino ketones in good to high yields. Mannich adducts were obtained in moderate to high diastereoselectivity, favoring anti isomer. The imidazole moiety of PMHis residue on catalyst plays an important role in the diastereoselectivity. PMHis@Fe3O4 MNPs were prepared via simple coprecipitation from an aqueous solution of Fe2+ and Fe3+ ions using NH4OH in the presence of L-histidine, followed by reductive amination with 2-pyridine carbaldehyde in the presence of NaBH4. Obtained PMHis@Fe3O4 MNPs were characterized by FT-IR, XRD, VSM, BET, TGA, SEM, EDX and TEM analysis.
https://scientiairanica.sharif.edu/article_21723_bdb02f6a18ecef097e6471cf3371999b.pdf
Fe3O4
magnetic nanoparticles
Mannich-type reaction
β-Amino ketones
Histidine
eng
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
2020-06-01
27
3
1216
1225
10.24200/sci.2020.54203.3646
21790
Green one-pot three-component synthesis of 4H-chromenes in the presence of nano-kaoline/BF3/Fe3O4 as a super paramagnetic nanocatalyst
R. Mohammadipour
chemazn@yahoo.com
1
A. Bamoniri
bamoniri@kashanu.ac.ir
2
B.F. Mirjalili
fmirjalili@yazd.ac.ir
3
Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, I.R. Iran
Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, I.R. Iran
Department of Organic Chemistry, Faculty of Chemistry, Yazd University, Yazd, I.R. Iran
Fused benzo-4H-pyran, namely, 4H-chromene moiety is the leading formation block of several heter-ocyclic natural products with biological activity such as, antioxidant, antibacterial, antiviral, antifun-gal, hypotensive, diuretic, and antiallergenic, antileishmanial, anticoagulant and antitumor. Herein, one-pot three components of aldehyde, malononitrile and enolizable compounds in the presence of nano-kaoline/BFn/Fe3O4 catalytic system to improve the 4H-chromenes via domino Knoevenagel-Michael-cyclization coupling reaction is reported. The advantages of this protocol involve high yield of products, use of solvent-free condition, easy experimental work-up system, low reaction times, re-cyclable catalyst and green process which privilege it as an alternative for other analogous synthetic procedures. The structure of synthesized 4H-chromenes were elucidated by FT-IR, 1H NMR and 13C NMR.
https://scientiairanica.sharif.edu/article_21790_4293ac3a255d7b809057a61fc2fc5776.pdf
One-pot three components
Nano-kaoline/BFn/Fe3O4
4H-chromenes
Solvent-free condition
eng
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
2020-06-01
27
3
1227
1233
10.24200/sci.2019.52442.2719
21665
Modeling the CO gas response of PEDOT:PSS/Fe(salen) thin film for a gas sensor
N. Anjabin
anjabin@shirazu.ac.ir
1
F. Arabloo
f.arabloo.1369@gmail.com
2
S. Javadpour
javadpor@shirazu.ac.ir
3
Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, P.O. Box: 71348-51154, Iran
Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, P.O. Box: 71348-51154, Iran
Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, P.O. Box: 71348-51154, Iran
Abstract. A thin film carbon monoxide (CO) gas sensor based on PEDOT:PSS/Fe (salen) has been developed using the spin coating technique on several glass pieces with interdigitated Au electrodes. The change in electrical resistance of the sensors with various content of dopants was measured in different CO gas concentrations and temperatures. It is found that Fe (salen) as a dopant can significantly improve the performance of PEDOT:PSS based gas sensors. Least square support vector regression (LSSVM) method was applied to predict the gas response characteristics of the films for different testing conditions. Modeling results show a satisfactory agreement with experimental findings.
https://scientiairanica.sharif.edu/article_21665_62d493413ca56ee3e24709ccc626f8e1.pdf
LSSVM
Gas sensor
PEDOT:PSS/Fe(salen)
thin film
Carbon monoxide
eng
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
2020-06-01
27
3
1234
1242
10.24200/sci.2020.53013.3006
21721
A kinetic study of acetone acidic oxidation with KMnO4 in the absence and presence of CuO/γAl2O3 as a heterogeneous nano-catalyst
M.T. Badri
tahabadri67@gmail.com
1
M. Barati
barati.m@kashanu.ac.ir
2
S.H. Rasa
rasa@kashanu.ac.ir
3
Department of Physical Chemistry, Faculty of Chemistry, University of Kashan, Kashan, Iran
Department of Applied Chemistry, Faculty of Chemistry, University of Kashan, Kashan, Iran
Department of Physical Chemistry, Faculty of Chemistry, University of Kashan, Kashan, Iran
The kinetic studies for acetone acidic oxidation with potassium permanganate in the absence and presence of CuO based nanocatalysts were carried out. The rate law and activation energy as kinetic parameters were evaluated for reaction with no catalyst and with 0, 2.5, 5 and 10 weight percentages of CuO on γ-Al2O3. Catalysts were prepared with impregnation method and were characterized using ICP-OES, XRD, BET, and TEM techniques. Products were analyzed with UV-VIS technique and examinations were performed with changing in concentration of a reactant and keeping constant the others to determine the order of the reaction for targeted one. Results showed that in the absence and presence of nano-catalysts, the order of reaction for all KMnO4, (CH3)2CO and H2SO4 were one. The rate constants for the reaction in the absence of catalyst and the presence of 0, 2.5, 5 and 10 wt% CuO were 0.0022, 0.0023, 0.0025, 0.0026 and 0.0029 L2.mole-2.min-1 as well as the relationship between the rate constants and temperature was investigated for each experiment and the activation energies for them were 56.767, 56.807, 53.978, 50.075 and, 46.774 kJ.mol-1, respectively. Also it was demonstrated that there was no relationship between the products concentrations and the rate of reaction.
https://scientiairanica.sharif.edu/article_21721_5409430057bee5982ab042be749b2068.pdf
Acetone oxidation
Reaction kinetics
Heterogeneous nano-catalyst
CuO
γ-Al2O3
Reaction rate law
eng
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
2020-06-01
27
3
1243
1252
10.24200/sci.2019.52832.2905
21700
Preparation of Pt-ZSM-5 zeolite membrane catalysts for the isomerization of linear alkane
B. Bayati
b.bayati@ilam.ac.ir
1
C. Algieri
c.algieri@itm.cnr.it
2
A.A. Babaluo
a.babaluo@sut.ac.ir
3
M. Haghighi
haghighi@sut.ac.ir
4
A. Ghorbani
asmaghorbani94@gmail.com
5
E. Drioli
e.drioli@itm.cnr.it
6
Nanostructure Materials Research Center (NMRC), Sahand University of Technology, Tabriz, P.O. Box 51335/1996, Iran.; Department of Chemical Engineering, Ilam University, Ilam, P.O. Box 69315/516, Iran.
Institute on Membrane Technology (ITM), Italian National Research Council (CNR), Via P. Bucci CUBO 17/C, 87030 Arcavacata di Rende (CS), Italy
Nanostructure Materials Research Center (NMRC), Sahand University of Technology, Tabriz, P.O. Box 51335/1996, Iran.; Department of Chemical Engineering, Sahand University of Technology, P.O. Box 51335/1996, Tabriz, Iran.
Department of Chemical Engineering, Sahand University of Technology, P.O. Box 51335/1996, Tabriz, Iran.; Reactor and Catalyst Research Center (RCRC), Sahand University of Technology, Tabriz, P.O. Box 51335/1996, Iran.
Department of Chemical Engineering, Ilam University, Ilam, P.O. Box 69315/516, Iran.
Institute on Membrane Technology (ITM), Italian National Research Council (CNR), Via P. Bucci CUBO 17/C, 87030 Arcavacata di Rende (CS), Italy
A ZSM-5 supported membrane was synthesized by secondary growth method. The Pt-ZSM5 membrane was prepared by impregnation method. The membrane was characterized by single gas permeation step at room temperature. The isomerization of n-pentane was chosen as a probe reaction for evaluating the catalytic performance of the membrane. In particular, the effect of the space velocity and the time on stream were considered. After the catalytic tests, the membrane was characterized by SEM, EDX and XRD. N2 permeance for the membrane, after calcination, was equal to 2.9 × 10-7 mol/m2.s.Pa indicating a coverage of the larger support pores by the zeolite crystals. This results was also confirmed by the SEM investigation. In addition, XRD analysis showed as the ZSM-5 was the desired zeolite-type. During the catalytic tests, it was observed a decrease of the nC5 conversion and an increase of the iC5 selectivity with WHSV. The nC5 conversion was decreased from 2.5 to less than 0.5, with an enhancement in weight hourly space velocity (WHSV), while the selectivity increases from 30 to over 70. On the other hand, it's conversion on catalyst enhanced from 10% to approximately 38%, with an increase in the reaction temperature from 250 to 450°C.
https://scientiairanica.sharif.edu/article_21700_2f1fc9e2bd617abc7f03f9b3ccf9cca4.pdf
catalytic zeolite membrane
ZSM-5
Pentane
Isomerization
eng
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
2020-06-01
27
3
1253
1263
10.24200/sci.2020.53396.3220
21752
Improvement of acrylic-urethane paint adhesion to PP-EPDM surface by mediated electrochemical oxidation
Sh. Mokhtari
sh.mokhtari@ippi.ac.ir
1
F. Mohammadi
f.mohammadi@ippi.ac.ir
2
M. Nekoomanesh Haghighi
m.nekoomanesh@ippi.ac.ir
3
Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran
Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran
Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran
Adhesion improvement of an acrylic-urethane paint on a bumper surface made from polypropylene/ethylene-propylene-diene monomer was investigated at long term after electrochemical treatment by 2N nitric acid and 0.6M Silver (II)-nitrate /2N nitric acid. The stability of the electrochemically treated samples was examined at different aging times by ATR and SEM. The results were also compared to those of the untreated and flame-treated samples. Accelerated UV weathering analysis along with morphology study by SEM approved the effectiveness of the Ag (II) treatment technique in long term particularly at curvature area of the bumper. For the Ag (II) treated samples, the increase in adhesion strength was sustained even after 650 hours exposure to UV irradiation in wet condition prior to bonding. In addition, the stability of the Ag (II)-treated surface was maintained for at least three months. In case of the flame-treated surface, hydrophobic recovery during aging in environment was found to reduce the polarity of the PP-EPDM surface. The pull-off test showed Ag (II) treatment can enhance adhesion strength of the acrylic-urethane coating on to PP-EPDM in comparison with the flaming method by 20.7%. Moreover the results of zeta potential analysis for Ag (II) treated blend showed a typical acidic surface.
https://scientiairanica.sharif.edu/article_21752_f369c68074fa90786275bb939b05f635.pdf
PP-EPDM bumper
MEO by Ag (II)
Adhesion improvement
eng
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
2020-06-01
27
3
1264
1274
10.24200/sci.2019.50700.1825
21663
Gas separation properties of polyacrylonitrilepolysulfone-iron oxide nanocomposite membrane
S. Homayoon
spphomayoon@yahoo.com
1
N. Esfandiari
n.esfandiari.2013@gmail.com
2
Department of Chemical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, 73711-13119, Iran
Department of Chemical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, 73711-13119, Iran
Gas separation process by the membrane is performed without changing the phase. For this reason, the costs are decreased. This study examined gas separation in Polyacrylonitrile (PAN) and Polysulfone (PSF) blend membranes. The ratio of polymers to mixed matrix membranes was considered 100% PAN, 100% PSF, (95% PAN -5% PSF), (90% PAN-10% PSF), (85% PAN-15% PSF). The best combi-nation of mixture was determined. Then, iron oxide nanoparticles with different weight percentages were placed on the membrane. The impact of adding different values of iron oxide nanoparticles in membrane was examined on separation of gas. Adding iron oxide nanoparticles to the membrane by 10% weight and measuring the value of permeability, it was observed that the permeability of this membrane for carbon dioxide, oxygen, nitrogen, and methane gases increased by 117%, 137%, 95%, and 53% compared to membranes without iron oxide nanoparticles. Examining the findings, it was re-vealed that the optimal value of adding iron oxide to improve the membrane properties was 10% by weight.
https://scientiairanica.sharif.edu/article_21663_2d19e08b33b266b866fc5867fee3a92c.pdf
Membrane
Gas separation
Iron oxide
Polysulfone
Polyacrylonitrile
eng
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
2020-06-01
27
3
1275
1292
10.24200/sci.2020.52681.2837
21776
Drinking water softening with electrocoagulation process: Influence of direct and alternating currents as inductive with different arrangement rod electrodes and polarity inverter
K. Yaghmaeian
kyaghmaeian@gmail.com
1
A. H. Mahvi
ahmahvi@yahoo.com
2
S. Nasseri
naserise@tums.ac.ir
3
M. Hooshangi Shayesteh
hoshangi_67@yahoo.com
4
H. Jafari Mansoorian
h.mansoorian@yahoo.com
5
N. Khanjani
narges.khanjani@gmail.com
6
- Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran - Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
- Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran - Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
- Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran - Center for Water Quality Research (CWQR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran
Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
Environmental Health Engineering Research Center, Kerman University of Medical Sciences, Kerman, Iran
Electrocoagulation process with direct and alternative current as inductive by using Fe and Al rods with different arrangements and polarity inverter and the factors related to the efficacy of the process. EC process efficacy was investigated in a batch mode under different conditions. Also the amount of energy and electrode consumption and the amount of sludge produced were determined. The highest efficiency of decreasing total hardness (98.26%) and calcium hardness (87.69%) was obtained by using alternative current with Fe-Al electrode arrangement under optimal conditions (pH of 9, current density of 9 mA/cm2 and reaction time of 12 min). Optimum charge loading was 0.54 F/m3. The maximum energy and electrode were consumed in optimum current density by using direct current, which was 2.47 kwh/m3 and 2.12 kg/m3, respectively. The maximum sludge production was in optimum current density by using alternative current of 0.098 kg/m3 and with the settleability of 0.075 L/g and by using direct current with disposing capacity of 0.063 L/g. This study showed that EC technology by using alternative current and using Fe electrodes can be used as an alternative and new method for decreasing water hardness with high efficiency and low energy consumption.
https://scientiairanica.sharif.edu/article_21776_51192e8b3620b6076274fa00b3f5fb9f.pdf
Water softening
Electrocoagulation
Operating current
Rod electrode
Polarity inverter
eng
Sharif University of Technology
Scientia Iranica
1026-3098
2345-3605
2020-06-01
27
3
1293
1299
10.24200/sci.2020.53151.3080
21779
Computational analysis of the slow invariant manifold for single and multi-route reaction mechanisms
M. Shahzad
shahzadmaths@hu.edu.pk
1
M. Ali
mehboob_maths@hu.edu.pk
2
F. Sultan
faisal_maths@hu.edu.pk
3
W. Azeem Khan
waqar_qau85@yahoo.com
4
Department of Mathematics and Statistics, Hazara University, Mansehra 21300, Pakistan
Department of Mathematics and Statistics, Hazara University, Mansehra 21300, Pakistan
Department of Mathematics and Statistics, Hazara University, Mansehra 21300, Pakistan
School of Mathematics and Statistics, Beijing Institute of Technology, Beijing 100081, China.; Department of Mathematics, Mohi-ud-Din Islamic University, Nerian Sharif, 12010 Azad Jammu & Kashmir, Pakistan
The complexity behavior lies in many natural phenomena’s, such as our ecosystems, the earth’s climate, the behavior of the animal group, living cells and our brain. Therefore, a new field of “systems chemistry” is emerging, which aims to capture the complexity observed in natural systems within a synthetic chemical framework. To understand the physical behavior of the chemical components in a reaction mechanism (system), we need to understand the overall (complete) reactions network as well as different available reaction-paths. We propose the development of a multi-route reaction mechanism for a complex chemical reaction mechanism which is unsolvable through a common way. Further, invariant manifold approximation has been constructed through the Quasi Equilibrium Manifold. The numerical results have been tabulated along with the graphical view through MATLAB
https://scientiairanica.sharif.edu/article_21779_509d3f41fb6daeb23b1c79eccfee9962.pdf
Reaction Mechanism
Reaction-Routes
Invariant Manifold