Masoud Fouladgar - Academia.edu (original) (raw)

Papers by Masoud Fouladgar

Frontiers in Chemistry, 2021

The aim of this topic was presentation of several features of electrochemical methods for analysi... more The aim of this topic was presentation of several features of electrochemical methods for analysis of real samples. In the last few decades, with the technical progress of electrochemical devices, much attention has been paid to electrochemical methods for analysis of different species. However, like other analytical methods, there has been the challenge of analyzing real samples with complex matrices and several interferences. Several techniques have been presented to improve selectivity and other figures of merit. Most of them are based onmodification of electrodes and creating selective electoactive sites on the surface of electrodes (Fouladgar, 2016). In addition, the modifiers may have electrocatalytic effect on the redox of analyte. On the other hand, application of nanomaterials has become popular because of increasing the active surface area of electrodes and consequently increasing sensitivity (Negahban et al., 2017). Papers in this research topic, present various aspects o...

ECS Solid State Letters, 2015

Bulletin of Materials Science

Russian Journal of Electrochemistry, 2022

Abstract In the present work, the synthesis of SnO 2 –Zn 2 SnO 4 nanocomposite was fulfilled acco... more Abstract In the present work, the synthesis of SnO 2 –Zn 2 SnO 4 nanocomposite was fulfilled according to solid-state technique followed by calcination. The SnO 2 –Zn 2 SnO 4 nanocomposites were specified by X-ray diffraction and scanning electron microscopy. Then, oxidation response of cabergoline (Cab) was investigated on the surface of SnO 2 –Zn 2 SnO 4 modified carbon paste electrode (SnO 2 –Zn 2 SnO 4 /CPE), exhibiting a well-defined single oxidation peak at +0.84 V vs . Ag/AgCl, NaCl (3 M) in an irreversible process. In oxidation reaction of Cab, equal number of protons and electrons are participated and the oxidation reaction rate is controlled by an adsorption step. The calibration curve from differential pulse voltammetry showed linearity in the concentration range of 3.0 to 155.0 µM ( R 2 = 0.9936) and detection limit was calculated to be 0.01 µM. The analysis results certified that SnO 2 –Zn 2 SnO 4 /CPE possess considerable potential to detect Cab in biological fluids.

Nano, 2022

A selective and sensitive method was proposed for the determination of hydrazine by electrochemic... more A selective and sensitive method was proposed for the determination of hydrazine by electrochemical deposition of Au nanodendrites (AuNDs) on the electropolymerized-2-(3,4-dihydroxybenzaldehyde) malononitrile (AuNDs/HBM/GCE). Deposition of AuNDs on the surface of HBM modified electrode effectively increased the electron transfer and active surface area. The surface analysis techniques substantiated the deposition of AuNDs and HBM molecules at the electrode surface. As-prepared modified electrode produced a sharp peak for hydrazine oxidation at [Formula: see text] versus Ag/AgCl, with a significant negative potential shift (about 0.43[Formula: see text]V) compared with unmodified glassy carbon electrode (GCE). The proposed electrode showed a linear response over 0.2[Formula: see text][Formula: see text]M–2.4[Formula: see text]mM with the detection limit of 0.08[Formula: see text][Formula: see text]M ([Formula: see text]. Moreover, AuNDs/HBM/GCE exhibited appropriate stability, select...

Journal of Molecular Liquids, 2020

Abstract Combination of the features of graphene and CuO nanoparticles has been applied for simul... more Abstract Combination of the features of graphene and CuO nanoparticles has been applied for simultaneous determination of two anti-cancer drugs, raloxifene and tamoxifen. Graphene and CuO nanoparticles were synthesized and pencil graphite electrode was modified by graphene-CuO-polypyrrole nanocomposite (GO-CuO-PP/PGE). Raloxifene and tamoxifen had distinguished peaks current on modified electrode. The electrochemical behavior of raloxifene on the GO-CuO-PP/PGE was study using electrochemical approaches and analytical features were obtained. Using first–principles calculation, we systematically examine the adsorption mechanism of raloxifene molecule by employing van der Waals corrections to investigate the adsorption behavior of raloxifene molecule on GO-CuO surface, focusing on the work function, energetics, charge transfer, structural and electronic properties. Raloxifene molecule acting as charge donors was strongly chemisorbed (−4.542 to −8.813 eV) on the GO-CuO surface. We observed a drop in the work function after raloxifene molecule adsorption. A comprehensive analysis of the charge density difference and the projected density of states demonstrate a strong chemical bonding.

Journal of The Electrochemical Society, 2018

Russian Journal of Electrochemistry, 2018

A simple and sensitive method was used to develop a novel sensor for determination of dacarbazine... more A simple and sensitive method was used to develop a novel sensor for determination of dacarbazine on the surface of multi-walled carbon nanotubes/CuFe 2 O 4 nanoparticles modified carbon paste electrode (MWCNTs/CuFe 2 O 4 /CPE). Cyclic voltammetry, differential pulse voltammetry, chronoamperometry, and electrochemical impedance spectroscopy were used to investigate the electrochemical behavior of dacarbazine at the chemically modified electrode. According to the results, MWCNTs/CuFe 2 O 4 /CPE showed high electrocatalytic activity for dacarbazine oxidation, producing a sharp oxidation peak current at about +0.80 vs. Ag/AgCl reference electrode at pH 5.0. The peak current was linearly dependent on dacarbazine concentration over the range of 0.10-76.0 μmol L-1 with the detection limit (3σ) of 0.08 μmol L −1. In addition, chronoamperometry was also used to determine diffusion coefficient of dacarbazine at MWCNTs/CuFe 2 O 4 /CPE.

Journal of the Taiwan Institute of Chemical Engineers, 2017

Dobutamine (DB) is a commonly used drug for treating heart failure specially in coronary care uni... more Dobutamine (DB) is a commonly used drug for treating heart failure specially in coronary care units. In this work, MnZnFe 2 O 4 nanoparticles were synthesized using chemical co-precipitation method, without subsequent calcination steps in high temperature. A new sensor was prepared for determination of dobutamine by improvement of performance of carbon paste electrode using MnZnFe 2 O 4 and ionic liquid. Investigation of electrochemical behavior of DB on the modified electrode showed that dobutamine was oxidized in lower potentials and oxidation current was increased dramatically in comparison with unmodified electrode. The sensor had two linear dynamic range in the range of 4.0-148.0 and 148.0-740.0 μmol/L DB with limit of detection 1.0 μmol/L DB. The proposed method was successfully applied to determine DB in urine and pharmaceutical samples.

Food Analytical Methods, 2016

Rapid analysis of health hazardous materials is necessary to prevent foodborne illness in food co... more Rapid analysis of health hazardous materials is necessary to prevent foodborne illness in food control science. Bisphenol A (BPA) is one of the potentially hazardous materials that may potentially create adverse health effects, if its concentration level in food is not controlled. In this work, carbon paste electrode has been modified with CdO nanoparticles and ionic liquid (IL/CdO/CPE) for determination of BPA in food samples. In addition, vitamin B 6 (B6) has separated oxidation peak at modified electrode and simultaneous determination of BPA and B6 is possible. The square wave voltammetric peak currents of BPA and B6 at IL/CdO/CPE have linear relation to their concentrations in the range of 0.01 to 800 μmol L −1 BPA and 0.4 to 500 μmol L −1 B6. Selectivity of the modified electrode was studied, and it was successfully applied for analysis of food samples.

Measurement, 2016

In this work, ZnO nano particles were synthesized and their characteristics were investigated by ... more In this work, ZnO nano particles were synthesized and their characteristics were investigated by scanning electron microscopy and X-ray powder diffraction. ZnO nano particles and a synthesized ionic liquid (1-Methyl-3-butylimidazolium bromide) were applied to modification of carbon paste electrode. Electrochemical behavior of benserazide (BA) was studied at modified electrode. Under optimum pH of 6.0, the relation between oxidation current and concentration of BA was linear in the range of 0.1-430.0 lmol L À1 BA. Detection limit of method was calculated to be 0.06 lmol L À1 BA. Effects of potential interferences on determination of BA were investigated and proposed method was used for determination of BA in biological samples.

Journal of The Electrochemical Society, 2015

Journal of Molecular Liquids, 2014

ABSTRACT The direct electrochemistry of diclofenac (DCF) at a surface of modified carbon paste el... more ABSTRACT The direct electrochemistry of diclofenac (DCF) at a surface of modified carbon paste electrode (CPE) was described. The electrode was modified with multiwall carbon nanotubes (MWCNTs) and 1-butyl-3-methylimidazolium hexafluoro phosphate as a binder. The oxidation peak potential of the DCF at a surface of the ionic liquid carbon nanotubes paste electrode (IL/CNTPE) appeared at 750 mV that was about 70 mV lower than the oxidation peak potential at the surface of the traditional carbon paste electrode under similar condition. Under the optimized conditions at pH 7.0, the peak current was linear to DCF concentrations over the concentration range of 03-750 mu mol L-1, using square wave voltammetry (SWV). The detection limit was 0.09 mu mol L-1. The proposed method was successfully applied to the determination of DCF in both pharmaceutical and patient urine samples.

Ionics, 2012

A carbon paste electrode chemically modified with multiwall nanotubes and ethynylferrocene (ETFc)... more A carbon paste electrode chemically modified with multiwall nanotubes and ethynylferrocene (ETFc) was used as a selective and sensitive electrochemical sensor for the determination of minor amounts of N-acetylcysteine (N-AC) in the presence of a high concentration of tryptophan (Trp). Square wave voltammetry (SWV) of N-AC at the modified electrode exhibited linear dynamic range with a detection limit (3 s) of 0.08 μmolL −1. The separations of anodic peak potentials of N-AC and Trp reached 400 mV using SWV. With good selectivity and sensitivity, the present method provides a simple method for selective detection of N-AC in real samples such as drug and urine.

A carbon paste electrode modified with multiwall carbon nanotubes (MWCNTPE) was prepared to study... more A carbon paste electrode modified with multiwall carbon nanotubes (MWCNTPE) was prepared to study the electrocatalytic activity of dopamine (DP) in the presence of homocysteine (HCy) and it was used for the deter- mination of HCy. The diffusion coefficient of HCy (D = 6.79×10 -6 cm 2 s -1 ), and the kinetic parameters of its oxidation, such as electron transfer coefficient (α = 0.46), and rate constant (kh = 7.44×10 2 dm 3 mol -1 s -1 ) were also determined using electrochemical approaches. Under the optimum pH of 5.0, the peak current of oxidation of HCy at MWCNTPE in the presence of DP occurred at a potential of about 530 mV and the results showed that the oxidation peak current of HCy at the modified carbon nanotubes electrode was higher than on the unmodified electrode. The peak current of differential pulse voltammograms of HCy solutions increased linearly in the range 3.0-600 μM HCy with a detection limit of 2.08 µM HCy. This method was also examined for determination of HCy i...

Water Science and Technology, 2020

This study aimed to find biosurfactant producing and crude oil-degrading bacteria able to deconta... more This study aimed to find biosurfactant producing and crude oil-degrading bacteria able to decontaminate crude oil from wastewater. The bacteria that were isolated from contaminated sites in an oil refinery plant in Isfahan, Iran, were identified by 16S rDNA sequencing as Achromobacter kerstersii strain LMG3441, Klebsiella pneumonia strain SKBA6, and Klebsiella variicola strain SKV2. According to the results obtained from different tests for the production of biosurfactant among three strains, only Achromobacter kerstersii strain LMG3441 was selected for further study. The pattern of residual hydrocarbons was analyzed by high-resolution gas chromatography-mass spectrometry (GC-MS). This novel and indigenous strain was capable of producing the highest amount of a glycolipid biosurfactant (7.81 g/L) in MSM (mineral salt medium) with 1% (v/v) crude oil as the only source of carbon and energy. The compound showed high surface activation capacity with reduction of surface tension from 40 ...

Acta Chimica Slovenica, 2020

Analysis of anticancer drugs is very important and necessary for the correct administration of th... more Analysis of anticancer drugs is very important and necessary for the correct administration of them in the human body. Electrochemical behavior of 6-thioguanine (6-TG) has been studied using a carbon paste electrode modified by 1-ethyl-3-methylimidazolium tetrafluoroborate (ionic liquid) (1E3MIBF4) and CuO nanoparticles (CuO/1E3MIBF4/ CPE). Using square wave voltammetry showed the linear relation between net anodic current and concentration of 6-TG in the range of 70 nmol L −1 to 520 µmol L −1 6-TG with the detection limit of 20 nmol L −1 6-TG. The proposed modified electrode had excellent repeatability (RSD = 1.31%, n = 5) and long term stability (2.9% deviation in 25 days). The diffusion coefficient of 6-TG on the CuO/1E3MIBF4/CPE was found to be 1.54 × 10 −5 cm 2 s −1 .The CuO/1E3MIBF4/ CPE was successfully applied for the determination of 6-TG in real samples. In addition, the anodic peaks of 6-TG and fluorouracil (5-FU) in their mixture can be well separated using CuO/1E3MIBF4/CPE and simultaneous determination of them was studied.

Nano, 2020

Mg-Al-LDH@MgFe2O4 nanocomposite was synthesized and was applied to enhance efficiency of gold mic... more Mg-Al-LDH@MgFe2O4 nanocomposite was synthesized and was applied to enhance efficiency of gold micron-dendrites/glassy carbon electrode (Mg-Al-LDH@MgFe2O4/AuNDs/GCE) for oxidation of ethanol. Based on the results, Mg-Al-LDH@MgFe2O4/AuNDs showed a current density of 29.4[Formula: see text]mA cm[Formula: see text], which was 1.6 times higher than that on the surface of AuNDs/GCE. Also, long-term stability of the studied electrode showed that the nanocomposite improves CO-poisoning tolerance of the AuNDs. Accordingly, the Mg-Al-LDH@MgFe2O4/AuNDs catalyst exhibits an excellent potential for application in alkaline ethanol fuel cells.

Journal of Experimental Nanoscience, 2016

This paper describes the development of 1-methyl-3-butylimidazolium chloride ionic liquid/cobalt ... more This paper describes the development of 1-methyl-3-butylimidazolium chloride ionic liquid/cobalt hexacyanoferrate nanoparticle modified multi-walled carbon nanotubes nanocomposite paste electrode for the electrocatalytic and adsorptive stripping voltammetric and impedimetric determination of diclofenac (DIC) in real samples. The nanocomposite was prepared by a simple chemical method and was characterised by scanning electron microscopy, Fourier transform infrared spectroscopy and atomic absorption spectroscopy. Also, the electrochemical behaviours of the modified electrode and the electrocatalytic oxidation of DIC were investigated in detail by cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy techniques. The kinetic parameters such as electron transfer coefficient, and apparent rate constant for the redox reaction between DIC and the modified electrode were also determined using electrochemical approaches. It was found that the modified electrode exhibited excellent electrocatalytic activity toward the oxidation of DIC, and under the optimised conditions, the linear response range and detection limit were found to be 1.0-100.0 and 0.3 mM, respectively using the differential pulse voltammetry method. The proposed method was applied for the sensitive and selective determination of diclofenac in the urine samples and pharmaceutical formulations with satisfactory results.