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RISS 인기검색어
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- 저자 : Mahmoud Nasrollahzadeh (검색결과 3 건)
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Synthesis of Au/Pd bimetallic nanoparticles and their application in the Suzuki coupling reaction
Mahmoud Nasrollahzadeh,Abbas Azarian,Mehdi Maham,Ali Ehsani 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
This communication reports on the synthesis and use of Au/Pd bimetallic nanoparticles, as separablecatalysts for ligand-free Suzuki coupling reactions. This method has the advantages of high yields,elimination of homogeneous catalysts, green reaction conditions, simple methodology and easy work up. Catalytic efficiency remains unaltered even after several repeated cycles. The catalyst was characterizedusing the SEM and EDS.
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Ali Ehsani,Mahmoud Nasrollahzadeh,Mohammad Ghasem Mahjani,Reza Moshrefi,Hossein Mostaanzadeh 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
The 3,30-(1,4-phenylene)bis(2-imino-2,3-dihydrobenzo[d]oxazole-5,3-iyl)bis(4-thylbenzenesulfonate)(1,4-Ph(OX)2(Ts)2) was synthesized and its inhibiting action on the corrosion of 1005 aluminum alloy(Al) in sulphuric acid was investigated by means of potentiodynamic polarization and electrochemicalimpedance spectroscopy (EIS). In the potentiodynamic polarization measurements the values of bc hadsmall changes with increasing inhibitor concentration, which indicated that the 1,4-Ph(OX)2(Ts)2 wasadsorbed on the metal surface and the addition of the inhibitor hindered the acid attack on the Alelectrode. In anodic domain, the value of ba decreases with the presence of 1,4-Ph(OX)2(Ts)2. The shift inthe anodic Tafel slope ba might be attributed to the modification of anodic dissolution process due to theinhibitor modules adsorption on the active sites. The inhibition efficiencies were obtained from weightloss measurement and electrochemical tests. The adsorption of 1,4-Ph(OX)2(Ts)2 onto the Al surfacefollowed the Langmuir adsorption model with the free energy of adsorption -△G0ads of -5.13 kJ mol1. Quantum chemical calculations were employed to give further insight into the mechanism of inhibitionaction of 1,4-Ph(OX)2(Ts)2.
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Naghdi, Samira,Sajjadi, Mohaddeseh,Nasrollahzadeh, Mahmoud,Rhee, Kyong Yop,Sajadi, S. Mohammad,Jaleh, Babak Elsevier 2018 JOURNAL- TAIWAN INSTITUTE OF CHEMICAL ENGINEERS Vol.86 No.-
<P><B>Abstract</B></P> <P>The present study reports an efficient, surfactant-free, novel and facile green method for the immobilization of Cu NPs on the surface of the graphene oxide/manganese dioxide (GO/MnO<SUB>2</SUB>) nanocomposite using <I>Cuscuta reflexa</I> leaf extract<I>.</I> In fact the phytochemical content of the plant extract are responsible to biosynthesis of Cu nanoparticles (NPs) and their stabilization by functionalizing the surface of graphene. The Cu NPs were characterized by Fourier transformed infrared spectroscopy (FT-IR) and UV–visible spectroscopy. MnO<SUB>2</SUB> NPs and GO/MnO<SUB>2</SUB> nanocomposite were prepared by using a simple one-step hydrothermal method without using any toxic solvent. The synthesized GO/MnO<SUB>2</SUB> and Cu/GO/MnO<SUB>2</SUB> nanocomposites were characterized using X-ray diffraction analysis (XRD), field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM) images, Brunauer–Emmett–Teller (BET), Thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), energy-dispersive X-ray spectroscopy (EDS), elemental mapping and FT-IR spectroscopy. The synthesized Cu/GO/MnO<SUB>2</SUB> nanocomposite was then successfully used as a reusable catalyst for the reduction of 2,4-dinitrophenilhydrazine (2,4-DNPH), 4-nitrophenol (4-NP), Rhodamine B (RhB), Congo red (CR), methyl orange (MO) and methylene blue (MB) using NaBH<SUB>4</SUB> in water at ambient temperature. This method is clean and environmentally friendly without using any toxic reducing agents.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Green synthesis of the Cu/GO/MnO<SUB>2</SUB> nanocomposite using <I>Cuscuta reflexa</I> leaf extract. </LI> <LI> Reduction of 4-NP, 2,4-DNPH, CR, MO, MB and RhB in water. </LI> <LI> Characterization of the GO/MnO<SUB>2</SUB> and Cu/GO/MnO<SUB>2</SUB> nanocomposites by FT-IR, XRD, FESEM, TEM, HR-TEM, EDS, BET, TGA, VSM and elemental mapping. </LI> <LI> High recycling efficiency of the Cu/GO/MnO<SUB>2</SUB> nanocomposite in reduction reactions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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