Showing papers by "Masoud Salavati-Niasari published in 2015"
TL;DR: In this paper, pomegranate juice was used not only as reductant but also as capping agent to form graphene nanosheets, and the results obtained from the characterization techniques proved high purity of the final products.
183 citations
TL;DR: In this article, the first successful attempt for the synthesis of nanocrystalline praseodymium oxide by using poly ethylene glycol (PEG) via a simple precipitation route in the presence of Trien was made.
Abstract: Nanocrystalline praseodymium oxide was prepared by a novel facile precipitation route via reaction of praseodymium nitrate and triethylenetetramine (Trien) as a new precipitating agent in the presence of poly ethylene glycol (PEG). To the best of our knowledge, this work is the first successful attempt for the synthesis of nanocrystalline praseodymium oxide by using PEG via a simple precipitation route in the presence of Trien. To investigate the effect of the amount of Trien on the morphology and particle size of praseodymium oxide, several experiments were carried out. Based on the experimental findings of this research, it was found that this parameter has an important impact on the morphology and particle size of the products. The structural, morphological and optical properties of the as-obtained products were characterized by techniques such as Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), energy dispersive X-ray microanalysis (EDX), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible (UV-vis) spectroscopy, and photoluminescence (PL) spectroscopy. To evaluate the catalytic properties of nanocrystalline praseodymium oxide, the photocatalytic degradation of 2-naphthol under ultraviolet light irradiation was carried out.
162 citations
TL;DR: In this paper, Kerium oxide (CeO2) nanoparticles have been synthesized from (NH4)2Ce(NO3)6, ethylenediamine and hydrazine by a hydrothermal method.
149 citations
TL;DR: In this article, a cost efficient NiO nanoparticles were synthesized by hydrothermal production of nano-scale Ni(OH) 2, using Ni(NO 3 ) 2 ·6H 2 O and NaOH as precursors, in the presence of H 2 acacen ligand.
149 citations
TL;DR: In this article, a new simple solvent-less route was used to synthesize Pr6O11 nanostructures via a heat treatment in air at 600 °C for 5 h, using [Pr L(NO3)2]NO3 (L = bis-(2-hydroxy phenyl methyl ketone)-dipropylene triamin Schiff base ligand), as a precursor, which was obtained by a solvent-free solid-solid reaction from different molar ratios of praseodymium nitrate and a Schiff bases ligand.
Abstract: Praseodymium oxide (Pr6O11) nanostructures were prepared via a new simple solvent-less route. The nanostructures were synthesized by a heat treatment in air at 600 °C for 5 h, using [Pr L(NO3)2]NO3 (L = bis-(2-hydroxy phenyl methyl ketone)-dipropylene triamin Schiff base ligand), as a precursor, which was obtained by a solvent-free solid–solid reaction from different molar ratios of praseodymium nitrate and a Schiff base ligand. The as-prepared nanostructures were characterized by means of several techniques including X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), scanning electron microscopy (SEM), energy dispersive X-ray microanalysis (EDX), photoluminescence (PL) spectroscopy, transmission electron microscopy (TEM), nuclear magnetic resonance spectroscopy (1H NMR) analysis, UV-vis diffuse reflectance spectroscopy and Fourier transform infrared (FT-IR) spectroscopy. The obtained results showed that the morphology and particle size of the final Pr6O11 could be dramatically affected via the molar ratio of praseodymium nitrate and the Schiff base ligand. The photocatalytic activity of the as-synthesized nanostructures was also investigated by the degradation of 2-naphthol as an organic contaminant under ultraviolet light irradiation.
140 citations
TL;DR: In this paper, pure holmium oxide ceramic nanostructures were synthesized by heat treatment in air at 600°C for 5h, utilizing [Ho L(NO3)2]NO3 (L=bis-(2-hydroxy-1-naphthaldehyde)-butanediamine Schiff base ligand), as a precursor, which was prepared via a solvent-free solid-solid reaction from different molar ratios of Holmium nitrate and Schiff base l ligand.
137 citations
TL;DR: The effect of various parameters such as temperature, time and molar ratio on the size and morphology of the product was investigated in this paper, where nanostructures appropriately enhanced flame retardant property of the cellulose acetate (CA) matrix.
137 citations
TL;DR: In this article, the effect of the polymeric capping agent on the morphology and size of praseodymium oxide precipitated from poly(ethylene glycol) in the presence of ethylenediamine (en) as precipitator was investigated.
70 citations
TL;DR: In this paper, the effect of shape and size control on the morphology and size of nanostructured Nd2O3 was studied by using anionic shape-and size controller.
Abstract: The effect of the anionic shape- and size-controller on the morphology and size of Nd2O3 prepared by a new simple approach was studied. Nanostructured Nd2O3 was synthesized by heat treatment in air at 900 °C for 5 h, employing powder, which was prepared by a solvent-free solid-state reaction from [NdL(NO3)2]NO3 (L = bis-(2-hydroxy-1-naphthaldehyde)-ethanediamine Schiff base compound), as a new precursor, in the presence of sodium dodecyl sulfate (SDS) as shape- and size-controller. The structural, morphological and optical properties of the as-obtained nanostructured Nd2O3 were characterized by thermo-gravimetric analysis (TGA), X-ray diffraction (XRD), energy dispersive X-ray microanalysis (EDX), UV-vis diffuse reflectance spectroscopy, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and Fourier transform infrared (FT-IR) spectroscopy. The obtained results demonstrated that the amount of SDS plays a key role in the morphology and particle size control of the neodymium oxide. Furthermore, the catalytic properties of the as-prepared nanostructures were evaluated by the photocatalytic degradation of the erythrosine (anionic dye) as water contaminant.
67 citations
TL;DR: The selenium nanostructures exhibited enhanced photocatalytic activity in the degradation of methylene blue (MB) under visible light irradiation and was characterized by XRD, SEM, TEM, EDS, and DRS.
66 citations
TL;DR: PbFe12O19 nanostructures were prepared in an aqueous solution by the sol-gel auto-combustion method using Pb(NO3)2 and Fe(NO 3)3 as starting materials and various carboxylic acids, including oxalic acid, malonic acid, succinic acid and maleic acid as fuel and reducing and capping agents as mentioned in this paper.
TL;DR: In this paper, a controllable hydrothermal method with FeSO4⋅7H2O and SeCl4 as precursors was proposed to synthesize FeSe2 nanoparticles.
TL;DR: In this paper, a core-shell Ag@organic (organic = 2-nitroaniline, 4-choloroanilines, PVA, and PVP) core shell nanoparticles (CSNPs) were introduced into dye-sensitized solar cells (DSSCs).
TL;DR: In this paper, the as-prepared nickel chromite nanostructures were characterized by energy dispersive X-ray microanalysis (EDX), transmission electron microscopy (TEM), TEM, FESEM, and Fourier transform infrared (FT-IR) spectroscopy.
TL;DR: In this article, tetramethylethylenediamine (TMED) was used as a new precipitating and co-capping agent in presence of poly ethylene glycol (PEG) as starting materials, and water as the solvent.
Abstract: Pr6O11 nanostructures were successfully prepared by new facile precipitation strategies that employed Pr(NO3)3·6H2O and a novel precipitating agent in presence of poly ethylene glycol (PEG) as starting materials, and water as the solvent. The novelty of this study is the application of tetramethylethylenediamine (TMED) as a new precipitating and co-capping agent in presence of PEG for the synthesis of praseodymium oxide nanostructures. The formation of as-produced nanostructures and their structure, shape and elemental composition were analyzed by means of several techniques including FT-IR, EDAX, XRD, TEM and FESEM. The optical properties of the samples were characterized by (UV–Vis) absorption and (PL) spectroscopy. In addition, the photocatalyst activity of as-prepared Pr6O11 nanostructures was evaluated by degradation of 2-naphthol under ultraviolet light irradiation. Based on the experimental findings in this work, it was found that particle size and shape of the final praseodymium oxide could be dramatically affected via the dosage of TMED. Furthermore, the mechanism effect of TMED in presence of PEG for formation of nanostructures discussed preliminarily.
TL;DR: In this article, the influence of nano-Fe2O3 magnetic nanoparticle on lysozyme activity and thermal stability was investigated by UV-vis spectrophotometry at 35°C in pH=725 using sodium phosphate as a buffer.
TL;DR: In this article, a novel technique for preparing cobalt(II) acetyl acetonate [Co(acac)2] nanostructures has been developed by using the sublimation process.
Abstract: For the first time, a novel technique for preparing cobalt(II) acetyl acetonate [Co(acac)2] nanostructures has been developed by using the sublimation process. It is found that the sublimation temperature has a main role in creating the special morphology and size of [Co(acac)2] and Co3O4 nanostructures. The nano-sized Co3O4 were obtained by thermal decomposition of [Co(acac)2] nanostructures at 400 °C for 120 min. The produced nanostructures were characterized by powder X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS) analysis, Raman spectroscopy, transmission and scanning electron microscopy (TEM, SEM). Magnetic and optical properties of the final product were measured at room temperature by a vibrating sample magnetometer (VSM) and UV-vis spectroscopy, respectively. The Co3O4 nanostructures were anchored onto the graphene sheets and the Co3O4/graphene (Co3O4/GR) nanocomposite was synthesized through pre-graphenization successfully. To investigate the catalytic properties of Co3O4/G nanocomposites, photooxidation of methyl orange (MO) was performed. The performed photocatalytic test shows that the methyl orange degradation was about 54.9% after 75 min irradiation of UV light.
TL;DR: In this paper, the effect of ball milling duration and calcination temperature on the morphology and size of pure copper chromite (CuCr2O4) nanostructures was investigated.
Abstract: Pure copper chromite (CuCr2O4) nanostructures were prepared via a new simple route. Nanostructures were synthesized by heat treatment in air at 900 °C for 5 h, using powder, which was obtained by a solvent-free solid-state reaction (using ball milling) from 1:2 molar ratio of [Cu(en)2(H2O)2]Cl2 and [Cr(en)3]Cl3·3H2O as novel precursors. The effect of ball milling duration and calcination temperature on the morphology and size of copper chromite was investigated. It was found that these parameters have significant influence on the morphology and size of the CuCr2O4. The as-synthesized CuCr2O4 nanostructures were characterized by means of several techniques such as X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, energy dispersive X-ray microanalysis, transmission electron microscopy and UV–Vis diffuse reflectance spectroscopy. Furthermore, the photocatalytic degradation of anionic dyes such as eosin Y, erythrosine and phenol red as water pollutants was performed to study the catalytic properties of as-prepared nanostructures.
TL;DR: In this article, a two-step sol-gel method was used in order to synthesize PbTiO3 nanoparticles with aid of Pb(CH3COO)2·2H2O, and Ti(OC4H9)4 (TNBT) as the starting reagents in the presence of ethanol as the solvent.
Abstract: A novel two-step sol–gel method was used in order to synthesize PbTiO3 nanoparticles with aid of Pb(CH3COO)2·2H2O, and Ti(OC4H9)4 (TNBT) as the starting reagents in the presence of ethanol as the solvent. To the best of authors knowledge, it is first time that benzene-1,3,5-tricarboxylic acid [C6H3(COOH)3] (trimesic acid) use as a chelate agent in produce lead titanate nanoparticles. Besides, to examine the effect of some reaction parameters such as surfactants, reaction temperature, and molar ratio of TNBT to trimesic acid on the morphology and chemical structure of final products several tests were performed. The as-synthesized PbTiO3 nanoparticle was utilized as photo-anode material for the fabrication of FTO/PbTiO3/CdS/Pt–FTO and photocatalyst for decolonization of rhodamine-B (RhB) and methylene blue (MB) to investigation its light harvesting applications. Furthermore, according to the XRD results, only in the presence of trimesic acid as the chelate agent pure PbTiO3 nanoparticle was synthesized. The photocatalyst results reveal that the maximum decolorization of 88 and 82 % for RhB and MB occurred with PbTiO3 nanoparticles catalyst in 40 min of stirring under ultraviolet light irradiation, respectively.
TL;DR: In this article, the plasmonic enhancement of photocurrent in dye-sensitized solar cells with deposition of Ag NPs between different TiO2 layers was examined and the results indicated that time treatment of AgNO3 and KBH4 is a key parameter which has effect on the PCE of the device.
TL;DR: In this paper, 1,3,5-benzenetricarboxylic acid (trimesic acid) was used as chelate agent for synthesis of NiTiO3 nanoparticles through a two-step sol-gel method.
Abstract: In this work, 1,3,5-benzenetricarboxylic acid (trimesic acid) was used as chelate agent for synthesis of NiTiO3 nanoparticles through a two-step sol–gel method. In this study, nickel acetate tetrahydrate [Ni(CH3COO)2·4H2O] and tetra-n-butyl titanate (TNBT) were used as starting reagents to fabricate NiTiO3 nanoparticles at different conditions. On the other hand, the effects of different surfactants such as cetyltrimethylammonium bromide, sodium dodecyl sulfate, and ethylene glycol, as well as reaction temperature, and the molar ratios of TNBT to 1,3,5-benzenetricarboxylic acid (trimesic acid) on the morphology and particle size of the products were investigated. It was found out that the size and morphology of the products were extremely influenced by the aforementioned parameters. XRD results indicate the effect of 1,3,5-benzenetricarboxylic acid on purity of NiTiO3 nanoparticles. A CdS/NiTiO3 heterojunction is also produced onto an ITO glass substrate to evaluate the photovoltaic property of the NiTiO3.
TL;DR: In this paper, a carminic acid-based quantum dot was successfully synthesized with the aid of thioglycolic acid (TGA) as capping agent, sulfide source, and reducing agent in order to reduce Cu 2+ to Cu + by a hydrothermal method.
TL;DR: In this paper, a solvent-free solventless route was used to synthesize Nd2O3 nanostructures via a novel facile solvent-less route, which was obtained by a solvent free solid-solid reaction from different molar ratios of neodymium nitrate and Schiff base ligand.
Abstract: Neodymium oxide (Nd2O3) nanostructures were synthesized via a novel facile solvent-less route. Nanostructures were prepared by heat treatment in air at 900 °C for 5 h, using [Nd L(NO3)2]NO3 (L = bis-(2-hydroxy-1-naphthaldehyde)-butanediamine Schiff base ligand), as precursor, which was obtained by a solvent-free solid–solid reaction from different molar ratios of neodymium nitrate and Schiff base ligand. The as-obtained nanostructures were characterized by means of techniques such as scanning electron microscopy, X-ray diffraction, transmission electron microscopy, thermo-gravimetric analysis, UV–Vis diffuse reflectance spectroscopy, energy dispersive X-ray microanalysis, and Fourier transform infrared spectroscopy. It was found that purity, morphology and particle size of the final Nd2O3 could be dramatically affected via the calcination temperature and molar ratio of neodymium nitrate and Schiff base ligand. The photocatalyst activity of as-prepared nanostructured Nd2O3 was also examined by degradation of rhodamine B as cationic dye under ultraviolet light irradiation.
TL;DR: In this article, a simple hydrothermal method using pomegranate marc peel (PMP) dyes-Cu(II) as a new copper precursor and sodium sulfite (Na2SO3) as reducing agent.
TL;DR: In this paper, various morphologies of tin dioxide nanostructures were synthesized via chemical reaction between tin chloride and different capping agents and the effect of different parameters such as precursors and temperature on the morphology of SnO2 was investigated.
Abstract: In this work various morphologies of tin dioxide nanostructures were synthesized via chemical reaction between tin chloride and different capping agents. The effect of different parameters such as precursors and temperature on the morphology of SnO2 nanostructures was investigated. Photo-catalytic property of tin oxide was examined by degradation of methyl orange as organic pollutant in water under UV light irradiation. Nanostructures were characterized by X-ray diffraction, photo luminescence, Fourier transform infra-red, diffuse reflectance spectroscopy, scanning electron microscopy and transmission electron microscopy. For preparation of nanocomposite tin dioxide was added to poly carbonate and poly styrene and results show that the SnO2 nanostructure can improve both thermal stability and flame retardant property of the polymeric matrixes. The enhancement is due to suitable dispersion and compatibility between polymeric chains and inorganic additive.
TL;DR: In this paper, the effectiveness of different additives on improving the thermal stabilities of phenolic composite was investigated by incorporating of graphene oxide sheets (GO) into the carbon/phenolic (PR), and then the ZrB2 nanoparticles into the GO/PR composite.
Abstract: The effectiveness of different additives on improving the thermal stabilities of phenolic composite was investigated by incorporating of graphene oxide sheets (GO) into the carbon/phenolic (PR), and then the ZrB2 nanoparticles into the GO/PR composite. The GOs dissipate heat throughout the sample thereby reducing thermal gradients and the intensity of heating at the surface exposed to flame. Also, at higher exposure time, the resistance to oxidation of the nanocomposite begins taking advantage of the ongoing formation of an oxide coating layer (ZrO2) on the exposed face. This protected the underlying unoxidized material from the structural damage caused by thermal shocks and high shear forces.
TL;DR: In this article, the photocatalytic activity of the synthesized products has been compared in the photodegradation activity of methylene blue using X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectrum, electron dispersive Xray spectroscopy and ultraviolet-visible.
Abstract: TiO2@SiO2 core/shell nanoparticles have been synthesized by sol–gel method from tetraethylorthotitanate and tetraethylorthosilicate. The synthesized products were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectrum, electron dispersive X-ray spectroscopy and ultraviolet–visible. The results revealed that compared to SiO2 and TiO2, TiO2@SiO2 core/shell nanoparticles display smaller crystal size and greater band gap energy. The photocatalytic activity of the synthesized products has been compared in the photodegradation activity of methylene blue.
TL;DR: Using the hydrothermal method, lanthanum hydroxide nanorods were synthesized by the reaction of LaCl3·7H2O, ethylenediamine, and hydrazine.
TL;DR: In this paper, a coprecipitation approach using ammonium heptamolybdate (NH4)6Mo7O24·4H2O) as starting materials in water as solvent was used to obtain octahedral and hierarchical self-assemblies.
TL;DR: In this article, NiCr2O4 normal spinel nanostructures were prepared via hydrothermal treatment at 180 °C for 12 hours in the presence of cetyltrimethylammonium bromide (CTAB), sodium dodecyl sulphate (SDS) and poly vinylpyrrolidone-25000 (PVP25000) as capping agents and subsequent calcination process at 500°C for 3 hours.
Abstract: NiCr2O4 normal spinel nanostructures were prepared via hydrothermal treatment at 180 °C for 12 h in the presence of cetyltrimethylammonium bromide (CTAB), sodium dodecyl sulphate (SDS) and poly vinylpyrrolidone-25000 (PVP-25000) as capping agents and subsequent calcination process at 500 °C for 3 h . In this method, [Ni(en)2(H2O)2](NO3)2 and [Cr(en)3]Cl3.3H2O used as precursors and not utilized any alkaline or precipitating agent. Detailed characterization of the as-prepared nanostructures were carried out by Fourier transform infrared (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance spectroscopy (DRS). XRD revealed the formation of pure nickel chromite spinel phase and SEM showed the formation of uniform sphere-like nanoparticles. Furthermore, the photocatalytic degradation of acid black 1 as diazo dye used in textile and dyeing water pollutants was Investigated.