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Papers by changiz karami

Research paper thumbnail of Green synthesized fluorescent carbon dots from oak apple for detection of efavirenz

Journal of Materials Science: Materials in Electronics

In this study, a facile synthesis of fluorescence carbon dots (CDs) from local oak apple (O-CDs) ... more In this study, a facile synthesis of fluorescence carbon dots (CDs) from local oak apple (O-CDs) in the mountainous region of Zagros was performed through hydrothermal treatment. The characterization of O-CDs was carried out by SEM, TEM, FTIR, EDX, Mapping, lain scan, and AFM, respectively. In addition, the fluorescence of CDs was quenched by efavirenz with a linear concentration of 10 to 450 lM, associated with the limit of detection of 3 lM. Subsequently, the CDs were successfully applied for efavirenz probing in blood plasma environment.

Research paper thumbnail of Nano-probe for determination of phenobarbital of green synthesized fluorescent carbon dots using Scrophularia striata

Journal of Materials Science: Materials in Electronics

In this study, using a thirsty plant extract and a simple hydrothermal method, a nano-probe was i... more In this study, using a thirsty plant extract and a simple hydrothermal method, a nano-probe was introduced to detect the phenobarbital based on fluorescence. Functional groups, particle size, surface morphology, and types of elements were identified using analysis such as FTIR, TEM, SEM, EDX, respectively. The excitation at 355 nm and emission intensity at 446 nm for nano-probe, the nanoprobe shows that various parameters such as pH, temperature, and time were investigated for optimization conditions. After optimizing the factors affecting the sensor's response, a linear range between 0 and 750 lM with a detection limit of 5 lM was obtained. Then, the effect of interfering with other materials was investigated and finally, the ability of this sensor to measure the phenobarbital in real samples has been studied.

Research paper thumbnail of Determination of phenobarbital in real sample using carbon quantum dots modified with tungsten as a fluorescent nanoprobe

Journal of Materials Science: Materials in Electronics

In this study, a sensitive and selective fluorescence nanoprobe has been designed based on carbon... more In this study, a sensitive and selective fluorescence nanoprobe has been designed based on carbon quantum dots modified by tungsten (WCQDs) for the detection of phenobarbital. Tungsten WCQDs were synthesized via a hydrothermal method using tungsten nitrate and glucose as a carbon source. The fluorescence signal of WCQDs was selectively increased by phenobarbital. The fluorescence increasing signal was applied for phenobarbital sensing at the pH = 8 without the interference of other materials. After optimizing the factors affecting the sensor’s response, a linear range between 25 and 500 µM with a detection limit of 5 µM was obtained. The sensor’s capability in the real-sample analysis was investigated by phenobarbital determination in human blood plasma samples.

Research paper thumbnail of Detection of copper ions using modified gold nanoparticles by two-functional groups

In this study, gold nanoparticles were fabricated using two different functional groups such as c... more In this study, gold nanoparticles were fabricated using two different functional groups such as crown ether and carboxylic acid and evaluated as a sensor to detect copper ions in an aqueous solution. The Au-crown/carboxylic is characterized with TEM, FTIR spectroscopy. To compare the response of the sensor to copper ions, the UV-vis spectrum was characterized before and after the increase of Cu ions. The mechanism to be considered for measuring copper ions in aqueous solutions is that Cu ions can successfully complexation with Au-crown/carboxylic which comes with color changes from red to blue. In the range of 75 nM to 1250 nM, the link between the decrease in adsorption intensity and the concentration of Cu ions at A630/A545 is linear with 0.9814 and 150 nM correlation coefficient and the limit of detection, respectively. In other words, among several other cations, the sensor assay especially measures copper ions and also has very simple and able to measure and detect copper ions ...

Research paper thumbnail of Removal of Methylene blue in Aqueous Solution Using Modified Fe3O4 Magnetic Nanoparticles by Guanidine

In this study, magnetic nanoparticle supported by guanidine was synthesized and its property inve... more In this study, magnetic nanoparticle supported by guanidine was synthesized and its property investigated in adsorption of methylene blue from wastewater samples. Physical and structural characteristics of the adsorbent were investigated by SEM, TEM and FTIR techniques. The effect of pH, initial concentration of methylene blue and adsorbent, contact time, and temperature were investigated to determine equilibrium isotherms, and kinetics of adsorption process. The optimum conditions of adsorbent were: pH=6, contact time=30min, adsorbent dose of 2.5 g/L and room temperature. The equilibrium isotherm study show that the adsorption process was fitted by Langmuir model and the adsorption kinetic a good compliance with pseudo second-order model. The present study showed that the magnetic nanoparticle supported by guanidine has high potential for adsorption of methylene blue, in addition to features like simple and rapid separation. Therefore, it can be used for adsorption and separation o...

Research paper thumbnail of A novel fluorescent turn-on probe for hydrogen peroxide based on carbon dots

Journal of Materials Science: Materials in Electronics

Detection of hydrogen peroxide is of significant importance for biological assays, and fluorescen... more Detection of hydrogen peroxide is of significant importance for biological assays, and fluorescence methods are intensively reported for this purpose. Due to the highly oxidative property of this species, usually fluorescence quenching is obtained during the interactions and decreased signals. Unlike carbon quantum dots (CQD)-based probes, it has been reported so far, adding H2O2 to the probe increases the fluorescence intensity (with excitation/emission maxima at 450/530 nm). The probe has a linear response range in the 3.00 μM to 300 mM with a detection limit of 1.00 µM (at S/N = 3). It was successfully applied to the determination of H2O2 in spiked to serum samples.

Research paper thumbnail of BiOCl/FeOCl/SiO<sub>2</sub> nanocomposite as an efficient novel catalyst toward the synthesis of 2-aryl-1H-benzimidazoles in mild aerobic condition

BiOCl/FeOCl nanorods composited by SiO<sub>2</sub> spherical nanoparticles as a novel... more BiOCl/FeOCl nanorods composited by SiO<sub>2</sub> spherical nanoparticles as a novel nanocatalyst and also it has been synthesized using a co-precipitation procedure. Additionally, its structural along with the catalyst activity have been determined by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, as well as Fourier transforminfrared spectroscopy. In addition, this nanocomposite was utilized efficiently in the synthesis of 2-arylbenzimidazole derivatives, which is described by the condensation of some aldehydes and o-phenylenediamines in the presence of BiOCl/FeOCl/SiO<sub>2</sub> nanocomposite as a novel nanocatalyst. Besides the investigated variables such as the amount of catalyst, reaction temperature, the synergistic effect of BiOCl and FeOCl, and effect of various solvents, the possible reusability of the catalyst is also studied. In conclusion, the synthesized BiOCl/FeOCl/SiO&l...

Research paper thumbnail of Mo-goethite as new composite for the degradation of methylene blue from the water with H2O2

DESALINATION AND WATER TREATMENT, 2020

In this study, a new structure of molybdenum (Mo) doped goethite (Mo-goethite) was synthesized by... more In this study, a new structure of molybdenum (Mo) doped goethite (Mo-goethite) was synthesized by the precipitation method. Next, the morphology of the Mo-goethite surface was characterized by scanning electron microscopy, the energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy, which indicates the presence of Mo in the structure. Moreover, X-ray diffraction indicated the structure and the particle diameter, which was estimated at 20 nm at 35° by Scherrer equation. The catalytic activity of Mo-goethite structure was investigated in methylene blue (MB) degradation in the presence of hydrogen peroxide. The factors studied in the evaluation of MB degradation using the catalyst include Mo/goethite molar ratio, initial H 2 O 2 concentration, initial pH, and Mo-goethite dosage. The results indicate that the catalyst (Mo-goethite) has a high ability to degradation of MB in the presence of H 2 O 2 in a short time. The results show that the optimum conditions for 20 mg L-1 MB solution were pH = 7, 0.1 g L-1 of Mo-goethite, and 21.2 mM of H 2 O 2 in 30 min.

Research paper thumbnail of Tungsten disulfide quantum dots (WS2 QDs) as a fluorescence probe for detection of dopamine (DA)

Journal of Materials Science: Materials in Electronics, 2021

Imbalance in the levels of dopamine as a neurotransmitter has led to several physiological and ps... more Imbalance in the levels of dopamine as a neurotransmitter has led to several physiological and psychological disorders; therefore detection of dopamine in patients is necessary to regulate body functions. A simple, high-performance method for determination of dopamine levels in real samples using a tungsten disulfide compound was employed. Tungsten disulfide(WS2) was synthesized by hydrothermal method using tungsten nitrate and thiourea and characterized by Transmission electron microscopy(TEM), Scanning electron microscopy(SEM), energy-dispersive X-Ray(EDX), energy-dispersive X-ray mapping analysis, and Fourier transform infrared(FTIR). The intensity of fluorescence quenching of this compound was tested in the presence of different molecules, but the amount of fluorescence decreased only with increasing dopamine. Therefore, such a quenching effect can be used to selectively detect dopamine (DA). The probe has a linear response range in the 50 μM to 450 μM with a detection limit of 20 µM (at S/N = 3). It was successfully applied to the determination of dopamine (DA) in spiked to serum samples. The mechanism of dopamine measurement using tungsten is such that WS2 as a catalyst and due to the active sites on its surface converts dopamine to form thin (poly-dopamine), which is placed on the surface of WS2 and causes fluorescence intensity to decrease.

Research paper thumbnail of BiOCl/FeOCl/SiO2 nanocomposite as an efficient novel catalyst toward the synthesis of 2-aryl-1H-benzimidazoles in mild aerobic condition

Inorganic and Nano-Metal Chemistry, 2017

ABSTRACT BiOCl/FeOCl nanorods composited by SiO2 spherical nanoparticles as a novel nanocatalyst ... more ABSTRACT BiOCl/FeOCl nanorods composited by SiO2 spherical nanoparticles as a novel nanocatalyst and also it has been synthesized using a co-precipitation procedure. Additionally, its structural along with the catalyst activity have been determined by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, as well as Fourier transforminfrared spectroscopy. In addition, this nanocomposite was utilized efficiently in the synthesis of 2-arylbenzimidazole derivatives, which is described by the condensation of some aldehydes and o-phenylenediamines in the presence of BiOCl/FeOCl/SiO2 nanocomposite as a novel nanocatalyst. Besides the investigated variables such as the amount of catalyst, reaction temperature, the synergistic effect of BiOCl and FeOCl, and effect of various solvents, the possible reusability of the catalyst is also studied. In conclusion, the synthesized BiOCl/FeOCl/SiO2 nanocomposite has several remarkable advantages like non-toxic nanocatalyst, has a recovering and recycling for three runs minimally without a significant loss of catalytic activity under the aerobic mild condition, short reaction times, and being solvent-free.

Research paper thumbnail of UV-Visible Spectroscopy Detection of Iron(III) Ion on Modified Gold Nanoparticles With a Hydroxamic Acid

Journal of Applied Spectroscopy, 2016

The present work describes the preparation of gold nanoparticles (AuNPs) functionalized with hydr... more The present work describes the preparation of gold nanoparticles (AuNPs) functionalized with hydroxamic acid and the use of them in UV-visible spectroscopy detection of iron(III) ions. The prepared AuNPs were thoroughly characterized by using UV-visible spectroscopy, TEM, and 1 H NMR techniques. The newly synthesized hydroxamic acid-AuNPs are brown in color due to the intense surface plasmon absorption band centered at 527 nm. In the presence of Fe(III), the surface plasmon absorption band is centered at 540 nm. However, the sensitivity of hydroxamic acid-AuNPs towards other metal ions such as Mg(II), Ca(II), Ag(I), Cu(II), Mn(II), Cr(II), Ni(II), Co(II),Fe(II), Hg(II), and Pb(II) can be negligible. This highly selective sensor allows a direct quantitative assay of Fe(III) with a UVvisible spectroscopy detection limited to 45.8 nM.

Research paper thumbnail of Naked Eye Detection of Cr3+ and Co2+ Ions by Gold Nanoparticle Modified with Azomethine

Plasmonics, 2017

azomethine-modified gold nanoparticles with azomethine (azomethine-AuNPs) in aqueous media, which... more azomethine-modified gold nanoparticles with azomethine (azomethine-AuNPs) in aqueous media, which were characterized by FT-IR spectroscopy, ultraviolet-visible spectroscopy (UV-Vis), dynamic light scattering (DLS), thermogravimetric analysis (TGA), and transmission electron microscopy (TEM). The azomethine-AuNPs were employed as colorimetric for Cr 3+ and Co 2+ ions at pH 6.2-7.5 and 8.1-9.1, at room temperature in aqueous solution. In the presence of Cr 3+ and Co 2+ , the azomethine-AuNPs induce aggregation of the nanoparticles. Upon aggregation, the surface plasmon absorption band red-shifts so that the nanoparticle solution appears a blue color. The sensitivity of azomethine-AuNPs towards other metal ions

Research paper thumbnail of Synthesis and In vitro Cytotoxicity of a Novel Efficient Cisplatin-loaded poly N-butyl cyanoacrylate

Indian Journal of Pharmaceutical Education and Research, 2016

Purpose: Typically, drug-loaded polymer colloidal carriers are synthesized by the drug entrapment... more Purpose: Typically, drug-loaded polymer colloidal carriers are synthesized by the drug entrapment during anionic emulsion polymerization. The purpose of this study was to trial the ability of Cisplatin-loaded Poly Butyl Cyanoacrylate (PBCA) nanoparticles. Methods: The cytotoxicity of Cisplatin-loaded PBCA nanoparticles was evaluated by MT assay. The Polymeric nanoparticles have been characterized using TEM, SEM, FTIR and DLS. Results: Polymeric nanoparticles with loaded and unloaded drug prepared by this method, have spherical structure with 350 and 230 nm in diameter and their zeta potentials were-3.2 and-10.7 mv respectively. The average amount of drug loaded on the nanoparticles was 70.88 ± 5.51%. MTT assay was carried out to evaluate the cytotoxicity property of the nanoparticles. Inhibition concentration values (IC 50) for Cisplatin-loaded Nanoparticles were 20.8 and 18.2 μM for 24 and 48 h respectively. Conclusion: It was shown that cisplatin-loaded nanoparticles strongly increased cytotoxicity in comparison to classic drug in the MCF-7 cell line.

Research paper thumbnail of Cobalt Manganese Oxide Nano Catalysts as a Recyclable Catalyst for the Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones-thiones

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry, 2014

Research paper thumbnail of Produce Spherical Nanoparticles of Poly (butyl cyanoacrylate) as Nano Carrier by Emulsion Polymerization Method

"Abstract Purpose: The use of nanotechnology in medicine and more specifically drug delivery... more "Abstract Purpose: The use of nanotechnology in medicine and more specifically drug delivery is set to spread rapidly. Methods: This study aimed at synthesizing and characterization of Poly n-butylcyanoacrylate (PBCA) by anionic emulsion polymerization of monomer butylcyanoacrylate in the presence of Dextran 70 kDa as a stabilizer. The nanosphere have been fully characterized using; TEM, SEM, FTIR and DLS. Polymeric nanoparticles synthesized by this method have spherical structure with 230 nm in diameter and zeta potential -10.7 mV. Cytotoxicity of these nanoparticles was evaluated using MTT assay on the U373MG and C6 cell lines of human and rat brain cancer respectively. Results: The MTT assay showed no statistical difference (p > 0.05) in viability of the cells incubated with empty PBCA nanoparticles. Conclusion: We have shown that PACA nanoparticles have no toxic effects on the U373MG and C6 cell lines. "

Research paper thumbnail of Simple optical determination of silver ion in aqueous solutions using benzo crown-ether modified gold nanoparticles

Research paper thumbnail of A Fast Procedure for the Preparation of Benzimidazole Derivatives Using Polymer-Supported with Trifluoromethanesulfonic Acid as Novel and Reusable Catalyst

Journal of the Chilean Chemical Society, 2013

A highly selective synthesis of benzimidazoles from the reaction of o-phenylenediamines and aroma... more A highly selective synthesis of benzimidazoles from the reaction of o-phenylenediamines and aromatic aldehydes in the presence of PVP-trifluoromethanesulfonic acid is reported, and morphological investigation was reported by FT-IR. The remarkable advantages of this method are the simple experimental procedures, shorter reaction times, high yields of product, and non-toxic catalyst. However, the reactions were performed in solvent-free and the catalyst could be reused for several runs.

Research paper thumbnail of A Fast Procedure for the Preparation of Benzimidazole Derivatives Using Polymer-Supported with Trifluoromethanesulfonic Acid as Novel and Reusable Catalyst

Journal of the Chilean Chemical Society, 2013

A highly selective synthesis of benzimidazoles from the reaction of o-phenylenediamines and aroma... more A highly selective synthesis of benzimidazoles from the reaction of o-phenylenediamines and aromatic aldehydes in the presence of PVP-trifluoromethanesulfonic acid is reported, and morphological investigation was reported by FT-IR. The remarkable advantages of this method are the simple experimental procedures, shorter reaction times, high yields of product, and non-toxic catalyst. However, the reactions were performed in solvent-free and the catalyst could be reused for several runs.

Research paper thumbnail of Determination of trace amounts of chromium ions in water and food samples using ligand-less solid phase extraction-based modified nano-boehmite(AlOOH)

Chromium is one of the hazardous pollutants in industrial effluents. In this study, a new nano-bo... more Chromium is one of the hazardous pollutants in industrial effluents. In this study, a new nano-boehmite modified with sodium dodecyl sulphate is developed for preconcentration trace amounts of chromium ions as a prior step to its determination by flame atomic absorption spectrometry. We investigated the effect of various parameters on the recovery of the analyte ions, including pH of sample solution, amount of sorbent, sample volume on extraction efficiency of the chromium ions. Under the best experimental conditions, the calibration curve was linear in the range of 1.0-700.0 ng.mL-1 of chromium with R 2 = 0.997. Detection limit was 0.6 ng.mL-1 in the original solution (3Sb/m) and the relative standard deviation for seven replicate determination of 0.5 µg.mL-1 chromium was ±2.4%. The developed method was successfully applied to the extraction and determination of chromium in water and food samples with satisfactory results.

Research paper thumbnail of Development of Ag nanoparticle-carbon quantum dot nanocomplex as fluorescence sensor for determination of gemcitabine

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

Research paper thumbnail of Green synthesized fluorescent carbon dots from oak apple for detection of efavirenz

Journal of Materials Science: Materials in Electronics

In this study, a facile synthesis of fluorescence carbon dots (CDs) from local oak apple (O-CDs) ... more In this study, a facile synthesis of fluorescence carbon dots (CDs) from local oak apple (O-CDs) in the mountainous region of Zagros was performed through hydrothermal treatment. The characterization of O-CDs was carried out by SEM, TEM, FTIR, EDX, Mapping, lain scan, and AFM, respectively. In addition, the fluorescence of CDs was quenched by efavirenz with a linear concentration of 10 to 450 lM, associated with the limit of detection of 3 lM. Subsequently, the CDs were successfully applied for efavirenz probing in blood plasma environment.

Research paper thumbnail of Nano-probe for determination of phenobarbital of green synthesized fluorescent carbon dots using Scrophularia striata

Journal of Materials Science: Materials in Electronics

In this study, using a thirsty plant extract and a simple hydrothermal method, a nano-probe was i... more In this study, using a thirsty plant extract and a simple hydrothermal method, a nano-probe was introduced to detect the phenobarbital based on fluorescence. Functional groups, particle size, surface morphology, and types of elements were identified using analysis such as FTIR, TEM, SEM, EDX, respectively. The excitation at 355 nm and emission intensity at 446 nm for nano-probe, the nanoprobe shows that various parameters such as pH, temperature, and time were investigated for optimization conditions. After optimizing the factors affecting the sensor's response, a linear range between 0 and 750 lM with a detection limit of 5 lM was obtained. Then, the effect of interfering with other materials was investigated and finally, the ability of this sensor to measure the phenobarbital in real samples has been studied.

Research paper thumbnail of Determination of phenobarbital in real sample using carbon quantum dots modified with tungsten as a fluorescent nanoprobe

Journal of Materials Science: Materials in Electronics

In this study, a sensitive and selective fluorescence nanoprobe has been designed based on carbon... more In this study, a sensitive and selective fluorescence nanoprobe has been designed based on carbon quantum dots modified by tungsten (WCQDs) for the detection of phenobarbital. Tungsten WCQDs were synthesized via a hydrothermal method using tungsten nitrate and glucose as a carbon source. The fluorescence signal of WCQDs was selectively increased by phenobarbital. The fluorescence increasing signal was applied for phenobarbital sensing at the pH = 8 without the interference of other materials. After optimizing the factors affecting the sensor’s response, a linear range between 25 and 500 µM with a detection limit of 5 µM was obtained. The sensor’s capability in the real-sample analysis was investigated by phenobarbital determination in human blood plasma samples.

Research paper thumbnail of Detection of copper ions using modified gold nanoparticles by two-functional groups

In this study, gold nanoparticles were fabricated using two different functional groups such as c... more In this study, gold nanoparticles were fabricated using two different functional groups such as crown ether and carboxylic acid and evaluated as a sensor to detect copper ions in an aqueous solution. The Au-crown/carboxylic is characterized with TEM, FTIR spectroscopy. To compare the response of the sensor to copper ions, the UV-vis spectrum was characterized before and after the increase of Cu ions. The mechanism to be considered for measuring copper ions in aqueous solutions is that Cu ions can successfully complexation with Au-crown/carboxylic which comes with color changes from red to blue. In the range of 75 nM to 1250 nM, the link between the decrease in adsorption intensity and the concentration of Cu ions at A630/A545 is linear with 0.9814 and 150 nM correlation coefficient and the limit of detection, respectively. In other words, among several other cations, the sensor assay especially measures copper ions and also has very simple and able to measure and detect copper ions ...

Research paper thumbnail of Removal of Methylene blue in Aqueous Solution Using Modified Fe3O4 Magnetic Nanoparticles by Guanidine

In this study, magnetic nanoparticle supported by guanidine was synthesized and its property inve... more In this study, magnetic nanoparticle supported by guanidine was synthesized and its property investigated in adsorption of methylene blue from wastewater samples. Physical and structural characteristics of the adsorbent were investigated by SEM, TEM and FTIR techniques. The effect of pH, initial concentration of methylene blue and adsorbent, contact time, and temperature were investigated to determine equilibrium isotherms, and kinetics of adsorption process. The optimum conditions of adsorbent were: pH=6, contact time=30min, adsorbent dose of 2.5 g/L and room temperature. The equilibrium isotherm study show that the adsorption process was fitted by Langmuir model and the adsorption kinetic a good compliance with pseudo second-order model. The present study showed that the magnetic nanoparticle supported by guanidine has high potential for adsorption of methylene blue, in addition to features like simple and rapid separation. Therefore, it can be used for adsorption and separation o...

Research paper thumbnail of A novel fluorescent turn-on probe for hydrogen peroxide based on carbon dots

Journal of Materials Science: Materials in Electronics

Detection of hydrogen peroxide is of significant importance for biological assays, and fluorescen... more Detection of hydrogen peroxide is of significant importance for biological assays, and fluorescence methods are intensively reported for this purpose. Due to the highly oxidative property of this species, usually fluorescence quenching is obtained during the interactions and decreased signals. Unlike carbon quantum dots (CQD)-based probes, it has been reported so far, adding H2O2 to the probe increases the fluorescence intensity (with excitation/emission maxima at 450/530 nm). The probe has a linear response range in the 3.00 μM to 300 mM with a detection limit of 1.00 µM (at S/N = 3). It was successfully applied to the determination of H2O2 in spiked to serum samples.

Research paper thumbnail of BiOCl/FeOCl/SiO<sub>2</sub> nanocomposite as an efficient novel catalyst toward the synthesis of 2-aryl-1H-benzimidazoles in mild aerobic condition

BiOCl/FeOCl nanorods composited by SiO<sub>2</sub> spherical nanoparticles as a novel... more BiOCl/FeOCl nanorods composited by SiO<sub>2</sub> spherical nanoparticles as a novel nanocatalyst and also it has been synthesized using a co-precipitation procedure. Additionally, its structural along with the catalyst activity have been determined by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, as well as Fourier transforminfrared spectroscopy. In addition, this nanocomposite was utilized efficiently in the synthesis of 2-arylbenzimidazole derivatives, which is described by the condensation of some aldehydes and o-phenylenediamines in the presence of BiOCl/FeOCl/SiO<sub>2</sub> nanocomposite as a novel nanocatalyst. Besides the investigated variables such as the amount of catalyst, reaction temperature, the synergistic effect of BiOCl and FeOCl, and effect of various solvents, the possible reusability of the catalyst is also studied. In conclusion, the synthesized BiOCl/FeOCl/SiO&l...

Research paper thumbnail of Mo-goethite as new composite for the degradation of methylene blue from the water with H2O2

DESALINATION AND WATER TREATMENT, 2020

In this study, a new structure of molybdenum (Mo) doped goethite (Mo-goethite) was synthesized by... more In this study, a new structure of molybdenum (Mo) doped goethite (Mo-goethite) was synthesized by the precipitation method. Next, the morphology of the Mo-goethite surface was characterized by scanning electron microscopy, the energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy, which indicates the presence of Mo in the structure. Moreover, X-ray diffraction indicated the structure and the particle diameter, which was estimated at 20 nm at 35° by Scherrer equation. The catalytic activity of Mo-goethite structure was investigated in methylene blue (MB) degradation in the presence of hydrogen peroxide. The factors studied in the evaluation of MB degradation using the catalyst include Mo/goethite molar ratio, initial H 2 O 2 concentration, initial pH, and Mo-goethite dosage. The results indicate that the catalyst (Mo-goethite) has a high ability to degradation of MB in the presence of H 2 O 2 in a short time. The results show that the optimum conditions for 20 mg L-1 MB solution were pH = 7, 0.1 g L-1 of Mo-goethite, and 21.2 mM of H 2 O 2 in 30 min.

Research paper thumbnail of Tungsten disulfide quantum dots (WS2 QDs) as a fluorescence probe for detection of dopamine (DA)

Journal of Materials Science: Materials in Electronics, 2021

Imbalance in the levels of dopamine as a neurotransmitter has led to several physiological and ps... more Imbalance in the levels of dopamine as a neurotransmitter has led to several physiological and psychological disorders; therefore detection of dopamine in patients is necessary to regulate body functions. A simple, high-performance method for determination of dopamine levels in real samples using a tungsten disulfide compound was employed. Tungsten disulfide(WS2) was synthesized by hydrothermal method using tungsten nitrate and thiourea and characterized by Transmission electron microscopy(TEM), Scanning electron microscopy(SEM), energy-dispersive X-Ray(EDX), energy-dispersive X-ray mapping analysis, and Fourier transform infrared(FTIR). The intensity of fluorescence quenching of this compound was tested in the presence of different molecules, but the amount of fluorescence decreased only with increasing dopamine. Therefore, such a quenching effect can be used to selectively detect dopamine (DA). The probe has a linear response range in the 50 μM to 450 μM with a detection limit of 20 µM (at S/N = 3). It was successfully applied to the determination of dopamine (DA) in spiked to serum samples. The mechanism of dopamine measurement using tungsten is such that WS2 as a catalyst and due to the active sites on its surface converts dopamine to form thin (poly-dopamine), which is placed on the surface of WS2 and causes fluorescence intensity to decrease.

Research paper thumbnail of BiOCl/FeOCl/SiO2 nanocomposite as an efficient novel catalyst toward the synthesis of 2-aryl-1H-benzimidazoles in mild aerobic condition

Inorganic and Nano-Metal Chemistry, 2017

ABSTRACT BiOCl/FeOCl nanorods composited by SiO2 spherical nanoparticles as a novel nanocatalyst ... more ABSTRACT BiOCl/FeOCl nanorods composited by SiO2 spherical nanoparticles as a novel nanocatalyst and also it has been synthesized using a co-precipitation procedure. Additionally, its structural along with the catalyst activity have been determined by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, as well as Fourier transforminfrared spectroscopy. In addition, this nanocomposite was utilized efficiently in the synthesis of 2-arylbenzimidazole derivatives, which is described by the condensation of some aldehydes and o-phenylenediamines in the presence of BiOCl/FeOCl/SiO2 nanocomposite as a novel nanocatalyst. Besides the investigated variables such as the amount of catalyst, reaction temperature, the synergistic effect of BiOCl and FeOCl, and effect of various solvents, the possible reusability of the catalyst is also studied. In conclusion, the synthesized BiOCl/FeOCl/SiO2 nanocomposite has several remarkable advantages like non-toxic nanocatalyst, has a recovering and recycling for three runs minimally without a significant loss of catalytic activity under the aerobic mild condition, short reaction times, and being solvent-free.

Research paper thumbnail of UV-Visible Spectroscopy Detection of Iron(III) Ion on Modified Gold Nanoparticles With a Hydroxamic Acid

Journal of Applied Spectroscopy, 2016

The present work describes the preparation of gold nanoparticles (AuNPs) functionalized with hydr... more The present work describes the preparation of gold nanoparticles (AuNPs) functionalized with hydroxamic acid and the use of them in UV-visible spectroscopy detection of iron(III) ions. The prepared AuNPs were thoroughly characterized by using UV-visible spectroscopy, TEM, and 1 H NMR techniques. The newly synthesized hydroxamic acid-AuNPs are brown in color due to the intense surface plasmon absorption band centered at 527 nm. In the presence of Fe(III), the surface plasmon absorption band is centered at 540 nm. However, the sensitivity of hydroxamic acid-AuNPs towards other metal ions such as Mg(II), Ca(II), Ag(I), Cu(II), Mn(II), Cr(II), Ni(II), Co(II),Fe(II), Hg(II), and Pb(II) can be negligible. This highly selective sensor allows a direct quantitative assay of Fe(III) with a UVvisible spectroscopy detection limited to 45.8 nM.

Research paper thumbnail of Naked Eye Detection of Cr3+ and Co2+ Ions by Gold Nanoparticle Modified with Azomethine

Plasmonics, 2017

azomethine-modified gold nanoparticles with azomethine (azomethine-AuNPs) in aqueous media, which... more azomethine-modified gold nanoparticles with azomethine (azomethine-AuNPs) in aqueous media, which were characterized by FT-IR spectroscopy, ultraviolet-visible spectroscopy (UV-Vis), dynamic light scattering (DLS), thermogravimetric analysis (TGA), and transmission electron microscopy (TEM). The azomethine-AuNPs were employed as colorimetric for Cr 3+ and Co 2+ ions at pH 6.2-7.5 and 8.1-9.1, at room temperature in aqueous solution. In the presence of Cr 3+ and Co 2+ , the azomethine-AuNPs induce aggregation of the nanoparticles. Upon aggregation, the surface plasmon absorption band red-shifts so that the nanoparticle solution appears a blue color. The sensitivity of azomethine-AuNPs towards other metal ions

Research paper thumbnail of Synthesis and In vitro Cytotoxicity of a Novel Efficient Cisplatin-loaded poly N-butyl cyanoacrylate

Indian Journal of Pharmaceutical Education and Research, 2016

Purpose: Typically, drug-loaded polymer colloidal carriers are synthesized by the drug entrapment... more Purpose: Typically, drug-loaded polymer colloidal carriers are synthesized by the drug entrapment during anionic emulsion polymerization. The purpose of this study was to trial the ability of Cisplatin-loaded Poly Butyl Cyanoacrylate (PBCA) nanoparticles. Methods: The cytotoxicity of Cisplatin-loaded PBCA nanoparticles was evaluated by MT assay. The Polymeric nanoparticles have been characterized using TEM, SEM, FTIR and DLS. Results: Polymeric nanoparticles with loaded and unloaded drug prepared by this method, have spherical structure with 350 and 230 nm in diameter and their zeta potentials were-3.2 and-10.7 mv respectively. The average amount of drug loaded on the nanoparticles was 70.88 ± 5.51%. MTT assay was carried out to evaluate the cytotoxicity property of the nanoparticles. Inhibition concentration values (IC 50) for Cisplatin-loaded Nanoparticles were 20.8 and 18.2 μM for 24 and 48 h respectively. Conclusion: It was shown that cisplatin-loaded nanoparticles strongly increased cytotoxicity in comparison to classic drug in the MCF-7 cell line.

Research paper thumbnail of Cobalt Manganese Oxide Nano Catalysts as a Recyclable Catalyst for the Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones-thiones

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry, 2014

Research paper thumbnail of Produce Spherical Nanoparticles of Poly (butyl cyanoacrylate) as Nano Carrier by Emulsion Polymerization Method

"Abstract Purpose: The use of nanotechnology in medicine and more specifically drug delivery... more "Abstract Purpose: The use of nanotechnology in medicine and more specifically drug delivery is set to spread rapidly. Methods: This study aimed at synthesizing and characterization of Poly n-butylcyanoacrylate (PBCA) by anionic emulsion polymerization of monomer butylcyanoacrylate in the presence of Dextran 70 kDa as a stabilizer. The nanosphere have been fully characterized using; TEM, SEM, FTIR and DLS. Polymeric nanoparticles synthesized by this method have spherical structure with 230 nm in diameter and zeta potential -10.7 mV. Cytotoxicity of these nanoparticles was evaluated using MTT assay on the U373MG and C6 cell lines of human and rat brain cancer respectively. Results: The MTT assay showed no statistical difference (p > 0.05) in viability of the cells incubated with empty PBCA nanoparticles. Conclusion: We have shown that PACA nanoparticles have no toxic effects on the U373MG and C6 cell lines. "

Research paper thumbnail of Simple optical determination of silver ion in aqueous solutions using benzo crown-ether modified gold nanoparticles

Research paper thumbnail of A Fast Procedure for the Preparation of Benzimidazole Derivatives Using Polymer-Supported with Trifluoromethanesulfonic Acid as Novel and Reusable Catalyst

Journal of the Chilean Chemical Society, 2013

A highly selective synthesis of benzimidazoles from the reaction of o-phenylenediamines and aroma... more A highly selective synthesis of benzimidazoles from the reaction of o-phenylenediamines and aromatic aldehydes in the presence of PVP-trifluoromethanesulfonic acid is reported, and morphological investigation was reported by FT-IR. The remarkable advantages of this method are the simple experimental procedures, shorter reaction times, high yields of product, and non-toxic catalyst. However, the reactions were performed in solvent-free and the catalyst could be reused for several runs.

Research paper thumbnail of A Fast Procedure for the Preparation of Benzimidazole Derivatives Using Polymer-Supported with Trifluoromethanesulfonic Acid as Novel and Reusable Catalyst

Journal of the Chilean Chemical Society, 2013

A highly selective synthesis of benzimidazoles from the reaction of o-phenylenediamines and aroma... more A highly selective synthesis of benzimidazoles from the reaction of o-phenylenediamines and aromatic aldehydes in the presence of PVP-trifluoromethanesulfonic acid is reported, and morphological investigation was reported by FT-IR. The remarkable advantages of this method are the simple experimental procedures, shorter reaction times, high yields of product, and non-toxic catalyst. However, the reactions were performed in solvent-free and the catalyst could be reused for several runs.

Research paper thumbnail of Determination of trace amounts of chromium ions in water and food samples using ligand-less solid phase extraction-based modified nano-boehmite(AlOOH)

Chromium is one of the hazardous pollutants in industrial effluents. In this study, a new nano-bo... more Chromium is one of the hazardous pollutants in industrial effluents. In this study, a new nano-boehmite modified with sodium dodecyl sulphate is developed for preconcentration trace amounts of chromium ions as a prior step to its determination by flame atomic absorption spectrometry. We investigated the effect of various parameters on the recovery of the analyte ions, including pH of sample solution, amount of sorbent, sample volume on extraction efficiency of the chromium ions. Under the best experimental conditions, the calibration curve was linear in the range of 1.0-700.0 ng.mL-1 of chromium with R 2 = 0.997. Detection limit was 0.6 ng.mL-1 in the original solution (3Sb/m) and the relative standard deviation for seven replicate determination of 0.5 µg.mL-1 chromium was ±2.4%. The developed method was successfully applied to the extraction and determination of chromium in water and food samples with satisfactory results.

Research paper thumbnail of Development of Ag nanoparticle-carbon quantum dot nanocomplex as fluorescence sensor for determination of gemcitabine

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy