Iranian Chemical Society
Nanochemistry Research
2538-4279
2423-818X
2
1
2017
01
01
Adsorption of H2S molecule on TiO2/Au nanocomposites: A density functional theory study
1
7
EN
Amirali
Abbasi
Molecular Simulation laboratory (MSL), Azarbaijan Shahid Madani University, Tabriz, Iran
a_abbasi@azaruniv.edu
Jaber
Jahanbin Sardroodi
Molecular Simulation laboratory (MSL), Azarbaijan Shahid Madani University, Tabriz, Iran
jsardrodi@azaruniv.edu
10.22036/ncr.2017.01.001
The adsorption of hydrogen sulfide molecule on undoped and N-doped TiO<sub>2</sub>/Au nanocomposites was investigated by density functional theory (DFT) calculations. The results showed that the adsorption energies of H<sub>2</sub>S on the nanocomposites follow the order of 2N doped (Ti site)>N-doped (Ti site)>Undoped (Ti site). The structural properties including bond lengths, angles<span id="transmark" style="display: none; width: 0px; height: 0px;"></span> and adsorption energies and electronic properties in view of the projected density of states (PDOSs) and molecular orbitals (MOs) were analyzed in detail. The results indicated that the interaction between H<sub>2</sub>S molecule and N-doped TiO<sub>2</sub>/Au nanocomposite is stronger than that between H<sub>2</sub>S and undoped nanocomposite, suggesting that N-doping helps to strengthen the interaction of H<sub>2</sub>S with TiO<sub>2</sub>/Au nanocomposite. Mulliken population analysis was conducted to analyze the charge transfer between the nanocomposite and H<sub>2</sub>S molecule. Although H<sub>2</sub>S molecule has no significant interaction with undoped nanocomposite, it tends to be strongly adsorbed on the N-doped nanocomposite. The results also suggest that the two doped nitrogen atoms in TiO<sub>2</sub> greatly strengthen the adsorption process, being a helpful procedure to help in the design and development of improved sensor devices for H<sub>2</sub>S detection.
Density functional theory,Nanocomposite,H2S,TiO2/Au nanocomposites
http://www.nanochemres.org/article_41808.html
http://www.nanochemres.org/article_41808_08403406beacc1b3e5e1c414366cb145.pdf
Iranian Chemical Society
Nanochemistry Research
2538-4279
2423-818X
2
1
2017
01
01
Green synthesis of gold nanoparticles using plant extract: Mini-review
8
19
EN
Reza
Teimuri-mofrad
Department of Organic and Biochemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
teymouri@tabrizu.ac.ir
Raha
Hadi
Department of Organic and Biochemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
raha.ha.90@gmail.com
Behnam
Tahmasebi
Department of Organic and Biochemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
tahmasei_b@yahoo.com
Sana
Farhoudian
Department of Organic and Biochemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
sana.farhoudian@gmail.com
Maryam
Mehravar
Department of Chemistry, Faculty of Science, University of Zabol, Zabol, Iran
maryammehravar22@yahoo.com
Ramin
Nasiri
Department of Organic and Biochemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
rnasiri@tabrizu.ac.ir
10.22036/ncr.2017.01.002
In this review, we examine the greenest nanoparticles of zero-valent metals, metal oxides and metal salts, with emphasis on recent developments routes. Products from nature or those derived from natural products, such as extracts of several plants or parts of plants, tea, coffee, banana, simple amino acids, as well as wine, table sugar and glucose, have been used as reductants and as capping agents during the present synthesis method. Polyphenols found in plant material often play a key role in the processes mentioned here. The techniques involved are generally one-pot processes, environmentally friendly and simple. Green synthesis of gold nanoparticles using several extracts and spices extracts was conducted, in which aqueous extracts HAuCl4.3H2O reduce to Au° has establishing themselves in specific crystal phase. Synthesized nanoparticles were confirmed by the color change of auric chloride which is yellow. The growth of nanoparticles was monitored by the behavior of surface Plasmon using UV-Vis spectroscopy; also the pH was determined meanwhile. Moreover, this approach is not only of a green rapid synthesis kind and considered as a better alternative to chemical synthesis, but also found to be effective for large scale synthesis of gold nanoparticles.
Gold Nano particle (AuNPs),Green synthesis,Nano metals,plant extract
http://www.nanochemres.org/article_41809.html
http://www.nanochemres.org/article_41809_0459dd0a9899e1e499149a333a10ee8a.pdf
Iranian Chemical Society
Nanochemistry Research
2538-4279
2423-818X
2
1
2017
01
01
The investigation on different light harvesting layers and their sufficient effect on the photovoltaic characteristics in dye sensitized solar cell
20
28
EN
Mohammad
Mazloum-Ardakani
Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran
mazloumardakani@gmail.com
Rezvan
Arazi
Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran
arazi.rezvan@yahoo.com
10.22036/ncr.2017.01.003
Titanium dioxide-based nanofibers (TiO<sub>2</sub> nanofiber) were prepared by an electrospinning technique. The electrospun composite fibers were synthesized at different concentrations of titanium isopropoxide (25.35, 50.69, 76.05 wt%) and calcinated at different temperatures (450 <sup>o</sup>C, 650 <sup>o</sup>C and 850 <sup>o</sup>C) for 2 h. The diameters of nanofibers decreased by increasing the inorganic part of composite nanofibers and principally depicted anatase, anatase- rutile and rutile phases. By increasing temperature from 450 <sup>o</sup>C to 850 <sup>o</sup>C, the anatase phase decreased whereas the rutile phase increased. The different optimized TiO<sub>2</sub> nanofibers were prepared and utilized as a sufficient scattering layer for the photoanode in dye sensitized solar cells. Then, the electron transport and recombination in TiO<sub>2</sub> nanofiber based dye sensitized solar cells (DSSCs) was investigated. It was shown that the electron life time in DSSCs with TiO<sub>2</sub> nanofibers, as a scattering layer, increases in different photoanode electrodes compared to that on DSSCs based on nanoparticles. As a result, conversion efficiency of 5.6% is realized, which is 55.37% higher than TiO<sub>2</sub> photoanodes without addition of nanofibers as a scattering layer.
Dye sensitized solar cell,Electrospinning,Sol–Gel,TiO2 nanofibers,TiO2 nanoparticles
http://www.nanochemres.org/article_41810.html
http://www.nanochemres.org/article_41810_f9c69eefe9c055dc2c30ca47ed217cba.pdf
Iranian Chemical Society
Nanochemistry Research
2538-4279
2423-818X
2
1
2017
01
01
Magnetic amine-functionalized graphene oxide as a novel and recyclable bifunctional nanocatalyst for solvent-free synthesis of pyrano[3,2-c]pyridine derivatives
29
41
EN
Shahnaz
Rostamizadeh
Department of Chemistry, Faculty of Science, K.N.Toosi University of Technology, Tehran, Iran
shrostamizadeh@yahoo.com
Asieh
Hemmasi
Department of Chemistry, Faculty of Science, K.N.Toosi University of Technology, Tehran, Iran
mina_hemasi@yahoo.com
Negar
Zekri
Faculty of Chemistry and Chemical Engineering, Malek-Ashtar University of Technology, Tehran, Iran
negar_zekri@yahoo.com
10.22036/ncr.2017.01.004
The new magnetic amine-functionalized graphene oxide (Fe<sub>3</sub>O<sub>4</sub>-GO-NH<sub>2</sub>) nanocatalyst was prepared through the reaction of 3-aminopropyltriethoxysilane (APTES) with magnetic graphene oxide (Fe<sub>3</sub>O<sub>4</sub>-GO). It was characterized by XRD, TEM, SEM, FT-IR and EDX techniques. The intrinsic carboxylic acids on the edges of Fe<sub>3</sub>O<sub>4</sub>-GO along with the amine groups post grafted to the surface of Fe<sub>3</sub>O<sub>4</sub>-GO led to preparation of an acid-base bifunctional magnetically recyclable nanocatalyst. It proved to be efficient nanocatalyst for solvent-free synthesis of pyrano[3,2-c]pyridine derivatives under mild reaction conditions with good to excellent yields. This heterogeneous catalyst also exhibited higher activities than acid or base functionalized mesoporous silica, magnetic GO or basic Al<sub>2</sub>O<sub>3</sub> an even higher than some basic homogeneous catalysts such as triethylamine and piperazine. More importantly, due to the loaded iron oxide nanoparticles, this catalyst could be easily recovered from the reaction mixture using an external magnet and reused without significant decrease in activity even after 7 runs.<br />
Characterization,Fe3O4-GO-NH2,Magnetically recoverable nanocatalyst,Pyrano[3,2-c]pyridine derivatives,Solvent-free
http://www.nanochemres.org/article_41811.html
http://www.nanochemres.org/article_41811_2d0c68aac4fc3cec0455c183d259be90.pdf
Iranian Chemical Society
Nanochemistry Research
2538-4279
2423-818X
2
1
2017
01
01
Extraction-preconcentration Mercury ion by Ghezeljeh montmorillonite nanoclay as a new native adsorbent from food and water samples
42
59
EN
Zahra
Hassanzadeh Siahpoosh
Department of Chemistry, Imam Khomeini International University (IKIU), Qazvin, Iran
z.hassanzadeh.s@gmail.com
Majid
Soleimani
Department of Chemistry, Imam Khomeini International University (IKIU), Qazvin, Iran
m-soleimani@hotmail.com
10.22036/ncr.2017.01.005
<em>Ghezeljeh</em> montmorillonite nanoclay or “<em>Geleh-Sar-Shoor</em>” (means head-washing clay) used as a native adsorbent to extraction-preconcentration mercury ions from a variety of real water and fish samples have been investigated in a batch system followed by atomic absorption spectroscopy (AAS) with vapor generation accessory (VGA) system. The clay was characterized by using FT-IR, SEM-EDS, XRF, XRD, CEC, Specific surface area and Zeta potential. The results of XRD, FT-IR, Zeta potential and CEC of the Ghezeljeh clay confirm that montmorillonite is the dominant mineral phase. On the basis of on SEM images, the distance between the layers is in nm level. The outcome of varying parameters and interfering ions were studied. Detection and quantification limits, preconcentration factor, and adsorption capacity were calculated. The Langmuir and Freundlich equations showed the finest fit to the equilibrium data. The adsorption procedure follows a pseudo-second-order reaction pattern. Calculation of ΔG<sup>0</sup>, ΔH<sup>0</sup> and ΔS<sup>0</sup> displayed that the nature of Hg(II) ions adsorption is endothermic and favorable at upper temperature.
Adsorption,Clay,food,Mercury,Water
http://www.nanochemres.org/article_41812.html
http://www.nanochemres.org/article_41812_b9f5b087a585233b2f97aac5aa055d11.pdf
Iranian Chemical Society
Nanochemistry Research
2538-4279
2423-818X
2
1
2017
01
01
Dispersive liquid-liquid microextraction coupled with magnetic nanoparticles for extraction of zearalenone in wheat samples
60
70
EN
Mitra
Amoli-Diva
Department of Chemistry, Payam Noor University (PNU), Tehran, Iran
mitraamoli@gmail.com
Zohreh
Taherimaslak
Faculty of Chemistry, Bu-Ali Sina University, Hamadan, Iran
zohreh.taherimaslak@gmail.com
Mehdi
Allahyari
Quality Control Laboratory, ARA Quality Research Co., Tehran, Iran
m.allahyari@araqr.com
Kamyar
Pourghazid
Department of Novel Medical Technologies, Darupakhsh Pharmaceutical Co., Tehran, Iran
kmrpourghazi@gmail.com
10.22036/ncr.2017.01.006
A new, sensitive and fast dispersive liquid-liquid microextraction (DLLME) coupled with micro-solid phase extraction (μ-SPE) was developed for determination of zearalenone (ZEN) in wheat samples. The DLLME was performed using acetonitrile/water (80:20 v/v) as the disperser solvent and 1-octanol as the extracting solvent. The acetonitrile/water (80:20 v/v) solvent was also used to extract ZEN from solid wheat matrix, and was directly applied as the disperser solvent for DLLME process. Additionally, hydrophobic oleic-acid-modified magnetic nanoparticles were used in μ-SPE approach to retrieve the analyte from the DLLME step. So, the method uses high surface area and strong magnetism properties of these nanoparticles to avoid time-consuming column-passing processes in traditional SPE. Main parameters affecting the extraction efficiency and signal enhancement were investigated and optimized. Under the optimum conditions, the calibration curve showed a good linearity in the range of 0.1-500 μg kg<sup>−1</sup> (R<sup>2</sup>=0.9996) with low detection limit of 83 ng g<sup>−1</sup>. The intra-day and inter-day precisions (as RSD %) in the range of 2.6-4.3 % and high recoveries ranging from 91.6 to 99.1 % were obtained. The pre-concentration factor was 3. The method is simple, inexpensive, accurate and remarkably free from interference effects.
Dispersive liquid–liquid microextraction,Magnetic nanoparticles,micro-solid phase extraction,Wheat samples,Zearalenone
http://www.nanochemres.org/article_41813.html
http://www.nanochemres.org/article_41813_5777fe39af62e9f7db44c435ae42970d.pdf
Iranian Chemical Society
Nanochemistry Research
2538-4279
2423-818X
2
1
2017
01
01
Recent Advances in Crystal Engineering from Nanoscience Views: A Brief Review
71
85
EN
Marzieh
Arab Fashapoyeh
Department of Chemistry, Ferdowsi University of Mashhad, Mashhad, Iran
marzieh_arab60@yahoo.com
Masoud
Mirzaei Shahrabi
Department of Chemistry, Ferdowsi University of Mashhad, Mashhad, Iran
mirzaeesh@um.ac.ir
Hossein
Eshtiagh-Hosseini
Department of Chemistry, Ferdowsi University of Mashhad, Mashhad, Iran
heshtiagh@um.ac.ir
10.22036/ncr.2017.01.007
Crystal engineering has recently emerged as a method of choice for the design and construction of organic as well as metal-organic functional materials. Crystal engineering attempts to establish packing trends in whole families of compounds and seeks to establish connections between structure and function. The utility of crystal engineering has also been expanded to the nanoscience and the development of nanomaterials. The crystal engineering of materials on the nanoscale has attracted attention from various fields of research. Using bottom-up assembly strategies, a wide range of functional systems can be accessed. Materials of nanometer-scale dimensions having unique physicochemical properties are of great interest in various fields such as synthetic chemistry, materials science, catalysis and medicine. This review concerns to the recent advances in crystal engineering from nanoscience views. This study was conducted in four categories; nanococrystals, nano metal-organic frameworks, composites of polyoxometalates and also some of the nanocarbons.
Composites of polyoxometalates,Crystal engineering,Nano metal-organic frameworks,Nanocarbons,Nanococrystals,Nanoscience
http://www.nanochemres.org/article_41814.html
http://www.nanochemres.org/article_41814_2e729e7e0477cdc96ae3d2796a2befeb.pdf
Iranian Chemical Society
Nanochemistry Research
2538-4279
2423-818X
2
1
2017
01
01
An efficient method for the synthesis of photo catalytically active ZnO nanoparticles by a gel-combustion method for the photo-degradation of Caffeine
86
95
EN
Rajesha
Bedre Jagannatha
Centre for Nano and Material Sciences, Jain University, India
rajeshabj1972@gmail.com
Swetha
Rani Ramu
Centre for Nano and Material Sciences, Jain University, India
swthrn@gmail.com
Mahesh
Padaki
Centre for Nano and Material Sciences, Jain University, India
sp.mahesh@jainuniversity.ac.in
R. Geetha
Balakrishna
Centre for Nano and Material Sciences, Jain University, India
br.geetha@jainuniversity.ac.in
10.22036/ncr.2017.01.008
In this study, Zinc oxide nanoparticles were synthesized by gel-combustion method using a novel bio-fuel tapioca starch pearls, derived from the tubers of Mannihot esculenta, to investigate the photocatalytic degradation of ccaffeine. The ZnO photocatalyst was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-visible spectroscopy. X-ray diffractometry result for the ZnO nanoparticles exhibit normal crystalline phase features. All observed peaks can be indexed to the pure hexagonal wurtzite crystal structures. There are no other impurities in the diffraction peak. In addition, SEM measurement shows that most of the nanoparticles are spongy and spherical in shape and fairly mono dispersed. A significant degradation of the Caffeine was observed when the catalyst was added into the solution even without the UV light exposure. In addition, the photo degradation increaseds with the photocatalyst loading. Besides the photocatalyst loading, the effect of some parameters on the photo degradation efficiency such as initial concentration and pH were also studied.
tapioca starch,Gel- synthesis,Photocatalysis,Caffeine, Endocrine disrupting compounds
http://www.nanochemres.org/article_47406.html
http://www.nanochemres.org/article_47406_15845dfa773f9f78c88a6b62aaeb93c3.pdf
Iranian Chemical Society
Nanochemistry Research
2538-4279
2423-818X
2
1
2017
01
01
Effect of adding Nanoclay (Cloisite-30B) on the Proton Conductivity of Sulfonated Polybenzimidazole
96
108
EN
Hashem
Ahmadizadegan
Department of Chemistry, Isfahan University of Technology, Isfahan, Iran
h.ahmadizadegan.2005@gmail.com
10.22036/ncr.2017.01.009
A novel sulfonated polybenzimidazole/organoclay (Cloisite-30B) (SPBI/clay) nanocomposite membranes was successfully synthesized based on aromatic diacide (1) and diaminobenzidine. Nanocomposite membranes were fabricated using 1, 4-bis (hydroxymethyl) benzene (BHMB) as cross-linker, and Cloisite-30B organoclay as the pseudo cross-linker. The cross-linked SPBI/clay nanocomposite membranes were prepared via solution intercalation method. Participation of reactive organoclay in the cross-linking process was established from ion exchange capacity (IEC) measurements and FTIR studies. Wide angle X-ray diffraction (WAXD), field emission-scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM) techniques confirmed the presence of a combination of the intercalated and partially exfoliated clay confirmed mixed clay dispersion morphology of intercalation and partial exfoliation of the clay platelets in the cross-linked SPBI/clay nanocomposite membrane. The cross-linked SPBI/clay nanocomposite membranes showed higher tensile strength, modulus and lower elongation at break compared to neat cross-linked SPBI. Water and methanol uptake studies revealed superior barrier properties of cross-linked SPBI/clay nanocomposite membranes compared to cross-linked SPBI. Furthermore, thermal stability, residual solvent in the membrane film, and structural ruination of membranes were analyzed by thermal gravimetric analysis (TGA). TGA data indicated an increase in thermal stability of the SPBI/clay nanocomposite membranes in compared to the pure polymer. The oxidative stability of SPBI improved remarkably with cross-linking and subsequent clay addition. These improvements in the thermo-mechanical, barrier and oxidative stability of the membranes could be achieved without significantly affecting the protonic conductivity.
Ion Exchange,Nanocomposite,Organoclay,Sulfonated Polybenzimidazole
http://www.nanochemres.org/article_48296.html
http://www.nanochemres.org/article_48296_ff867f50c058de43d03f37aa6793b1ce.pdf
Iranian Chemical Society
Nanochemistry Research
2538-4279
2423-818X
2
1
2017
01
01
Highly efficient nitrobenzene photoreduction over the amino acid-modified CdS-TiO2 nanostructures under visible light
109
119
EN
Mohsen
Padervand
Faculty of Science, Department of Chemistry, University of Maragheh, Maragheh, Iran
mohsenpadervand@gmail.com
Atefeh
Rahmani
Department of Chemistry, Sharif University of Technology, Tehran, Iran
rahmani@gmail.com
Sara
Rahimnejad
Department of Chemistry, Islamic Azad University, Shahr-e-Rey Branch, Tehran, Iran
rahimnejad@gmail.com
Mohammad Reza
Gholami
Department of Chemistry, Sharif University of Technology, Tehran, Iran
ghlmi@sharif.ir
10.22036/ncr.2017.01.010
CdS-coupled TiO<sub>2</sub> nanocrystals were prepared by the microemulsion-mediated solvothermal method at pretty low temperatures. The semiconductor nanocrystals were modified with tyrosine, phenyl alanine, glysine and glutamate aminoacids and then were characterized by BET, SEM, EDX, XRD, UV–Vis spectroscopy, and FTIR analysis methods. The specific surface area and the average pore diameter were found to be about 470 m<sup>2</sup> g<sup>−</sup><sup>1</sup> and 2.8 nm, respectively. Moreover, the average size of the CdS-TiO<sub>2</sub> particles was evaluated to be 28 nm. The results showed that the modification process with the aminoacids improves the adsorption capability and photoactivity of the samples. Among them, tyrosine was determined to be the best choice. According to the results, modification of CdS-TiO<sub>2</sub> heterojunction photocatalyst with electron-donating groups is an efficient strategy to increase the photoreduction of nitroaromatic compounds. Reusability experiments were also carried out and confirmed the high capacity of the prepared samples for the photoconversion of nitrobenzene after being repeated for four times.
Amino acid,CdS-TiO2,Microemulsion-mediated solvothermal method,Nitrobenzene
http://www.nanochemres.org/article_49320.html
http://www.nanochemres.org/article_49320_fa88317f708836e422795b17ccf10748.pdf
Iranian Chemical Society
Nanochemistry Research
2538-4279
2423-818X
2
1
2017
01
01
Sonochemical synthesis and characterization of nano-sized zinc(II) coordination complex as a precursor for the preparation of pure-phase zinc(II) oxide nanoparticles
120
131
EN
Maryam
Ranjbar
Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran
marandjbar@gmail.com
Mostafa
Yousefi
Department of Chemical Technologies, Iranian Research Organization for Science and Technology
(IROST), Tehran, Iran
mostafayousefi12@gmail.com
Nasrin
Shahsavan
Department of Chemistry, Faculty of Sciences, Islamic Azad University, Shahr-e-Rey Branch, Tehran, Iran
nasrin.shahsavan@yahoo.com
Mohammad
Yousefi
Department of Chemistry, Faculty of Sciences, Islamic Azad University, Shahr-e-Rey Branch, Tehran, Iran
myousefi50@yahoo.com
Ehsan
Jalilian
Department of Structural Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
ehsanj@yahoo.com
Lars
Eriksson
Department of Structural Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
lars.erikssan@mmk.su.se
10.22036/ncr.2017.01.011
In current study, nanoparticles and single crystals of a Zn(II) coordination complex, [Zn(dmph)I<sub>2</sub>](<strong>1</strong>), {dmph=2,9-dimethyl-1,10-phenanthroline(neocuproine)}, have been synthesized by the reaction of zinc(II) acetate, KI and neocuproine as ligand in methanol using sonochemical and heat gradient methods, respectively. The nanostructure of <strong>1</strong> was characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), FT-IR spectroscopy and elemental analyses, and the structure of compound <strong>1</strong> was determined by single-crystal X-ray diffraction. The thermal stability of nano-sized <strong>1</strong> has been studied by thermogravimetric (TG) and differential thermal analyses (DTA). Structural determination of compound <strong>1</strong> reveals the Zn(II) ion is four-coordinated in a distorted tetrahedral configuration by two N atoms from a 2,9-dimethyl-1,10-Phenanthroline ligand and two terminal I atoms. The effect of supercritical condition on stability, size and morphology of nano-structured compound <strong>1</strong> has also been studied. The XRD pattern of the residue obtained from thermal decomposition of nano-sized compound <strong>1</strong> at 600 <sup>°</sup>C under air atmosphere provided pure phase of ZnO with the average particles size of about 31 nm.
crystal structure,Neocuproine,Sonochemical method,Thermal analyses,Zinc oxide nanoparticles
http://www.nanochemres.org/article_49503.html
http://www.nanochemres.org/article_49503_ea8c57ea10f9378480d99b87d1ee9bd6.pdf
Iranian Chemical Society
Nanochemistry Research
2538-4279
2423-818X
2
1
2017
01
01
Temperature effect on the nucleation and growth of TiO2 colloidal nanoparticles
132
139
EN
Morteza
Sasani Ghamsari
Photonics and Quantum Technologies Research School, NSTRI, Tehran, Iran
msasani@aeoi.org.ir
Hamed
Mehranpour
Department of Material Science and Engineering, Sharif University of Technology, Tehran, Iran
hamed.mehranpour@gmail.com
Masoud
Askari
Department of Material Science and Engineering, Sharif University of Technology, Tehran, Iran
askari@sharif.edu
10.22036/ncr.2017.01.012
The nucleation and growth of sol-gel derived TiO<sub>2</sub> colloidal nanoparticles have been studied using <em>experiment and theory as well</em>. In this study, the temperature effect on the formation of TiO<sub>2</sub> nanoparticles was discussed and some effective parameters such as the supply rate of solute (Q<sub>0</sub>), the mean volumic growth rate of stable nuclei during the nucleation period (u), the diffusion coefficient of [Ti]<sup>+4</sup> ions and the nucleus size were determined. The formation of TiO<sub>2</sub> nanoparticles in three different temperatures (60, 70 and 80°C) was studied. The obtained results showed that the process temperature has a considerable impact on the nucleation and growth of TiO<sub>2 </sub>nanoparticles. It can be concluded that increasing the temperature leads to a decrease of the supersaturation and an increase of the nucleus size, supply rate of monomer, nanoparticles density and growth rate as evident from LaMer diagram.
Colloidal nanoparticles,growth,Nucleation,LaMer diagram,Titanium dioxide
http://www.nanochemres.org/article_49532.html
http://www.nanochemres.org/article_49532_0d9c9a736e1e605e515fd422343b3cd0.pdf
Iranian Chemical Society
Nanochemistry Research
2538-4279
2423-818X
2
1
2017
01
01
TiO2/SiO2 prepared via facile sol-gel method as an ideal support for green synthesis of Ag nanoparticles using Oenothera biennis extract and their excellent catalytic performance in the reduction of 4-nitrophenol
140
150
EN
Bahar
Khodadadi
0000-0001-5848-2530
Department of Chemistry, Faculty of Science, University of Qom, Qom, Iran
bkhodadadi98@yahoo.com
10.22036/ncr.2017.01.013
In the present study, the extract of the plant of Oenothera biennis was used to green synthesis of silver nanoparticles (Ag NPs) as an environmentally friendly, simple and low cost method. And Additionally, TiO<sub>2</sub>/SiO<sub>2</sub> was prepared via facile sol-gel method using starch as an important, naturally abundant organic polymer as an ideal support. The Ag NPs/TiO<sub>2</sub>/SiO<sub>2 </sub>as an effective catalyst was prepared through reduction of Ag<sup>+</sup> ions using Oenothera biennis extract as the reducing and stabilizing agent and Ag NPs immobilization on TiO<sub>2</sub>/SiO<sub>2</sub> surface in the absence of any stabilizer or surfactant. Several techniques such as FT-IR spectroscopy, UV-Vis spectroscopy, X-ray Diffraction (XRD), sScanning eElectron mMicroscopy (FE-SEM), Eenergy dDispersive X-ray sSpectroscopy (EDS), and Ttransmission Eelectron Mmicroscopy (TEM) were used to characterize TiO<sub>2</sub>/SiO<sub>2</sub>, silver nanoparticles (Ag NPs), and Ag NPs/TiO<sub>2</sub>/SiO<sub>2</sub>. Moreover, the catalytic activity of the Ag NPs/ TiO<sub>2</sub>/SiO<sub>2</sub> was investigated in the reduction of 4-nitrophenol (4-NP) at room temperature. On the basis of the results, the Ag NPs/TiO<sub>2</sub>/SiO<sub>2</sub> was found to be high catalytic activity highly active catalyst according to the experimental results in this study. In addition, Ag NPs/TiO<sub>2</sub>/SiO<sub>2</sub> can be recovered and reused several times in the reduction of 4-NP with no significant loss of catalytic activity.
TiO2/SiO2,Ag Nanoparticles,Oenothera biennis,NaBH4,4-NP
http://www.nanochemres.org/article_49675.html
http://www.nanochemres.org/article_49675_9362d94edd4e3b30c539f5ba6e4c4b20.pdf
Iranian Chemical Society
Nanochemistry Research
2538-4279
2423-818X
2
1
2017
01
01
A New Sensor Based on Graphite Screen Printed Electrode Modified With Cu-Nanocomplex for Determination of Paracetamol
151
158
EN
Hadi
Beitollai
Environment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran
h.beitollahi@yahoo.com
Reza
Zaimbashi
Department of Chemistry, Graduate University of Advanced Technology, Kerman, Iran
r.zaim@chmail.ir
10.22036/ncr.2017.01.014
Paracetamol is a non-steroidal anti-inflammatory drug used as an antipyretic agent for the alternative to aspirin. Conversely, the overdoses of paracetamol can cause hepatic toxicity and kidney damage. Hence, the determination of paracetamol receives much more attention in biological samples and also in pharmaceutical formulations. Here, we report a rapid<span id="transmark" style="display: none; width: 0px; height: 0px;"></span> and sensitive detection of the paracetamol based on screen-printed modified electrode (SPE) with Cu nanocomplex (Cu) in pH=7.0. The paracetamol is not stable in strong acidic and strong alkaline media, and is hydrolyzed and hydroxylated. However, it is stable in intermediate pHs due to the dimerization of paracetamol. The kinetics of the paracetamol oxidation was briefly studied and documented in the schemes. In addition, the characterization of Cu nanocomplex was probed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX). Moreover, the voltammetry determined the paracetamol with the linear concentration ranging from 10.0 to 1000.0 μM and the lower detection limit of 1.0 μM. This method was also successfully used to detect the concentration of paracetamol in pharmaceutical formulations and urine samples.
Paracetamol,Cu nanocomplex,Graphite screen printed modified electrode,Voltammetry
http://www.nanochemres.org/article_49677.html
http://www.nanochemres.org/article_49677_626ca94d1acd81c96072074eeb7706cd.pdf