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Alinezhad, Heshmatollah,Tajbakhsh, Mahmood,Salehian, Fatemeh,Biparva, Pourya Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.10
$TiO_2$ nanoparticles were synthesized and characterized by SEM and XRD techniques. The $TiO_2$ nanoparticles were employed as a recyclable, inexpensive and efficient catalyst for the synthesis of substituted quinoxalines in high to excellent yields and in relatively short duration.
Heshmatollah Alinezhad,Mahmood Tajbakhsh,Fatemeh Salehian,Pourya Biparva 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.10
TiO_2 nanoparticles were synthesized and characterized by SEM and XRD techniques. The TiO_2 nanoparticles were employed as a recyclable, inexpensive and efficient catalyst for the synthesis of substituted quinoxalines in high to excellent yields and in relatively short duration.
Preparation of voltammetric biosensor for tryptophan using multi-walled carbon nanotubes
Majid Kia,Akbar Islamnezhad,Shahab Shariati,Pouria Biparva 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.10
Multi-walled carbon nanotubes (MWCNTs) were grown by chemical vapor deposition. The effect of the composition of carbon paste electrode on its voltammograms was evaluated in basic solution with 5.0×10^(−5) M tryptophan (Trp). It was found that addition of MWCNTs to the carbon paste would generate the peak current of Trp because of its catalytic effect on the redox process. The pH strongly affects the peak potential of Trp. The best analytical response was obtained at pH 13.0. The anodic peak currents were proportional to Trp concentrations in the range of 1.0×10−9-1.0×10^(-4) M under the optimized experimental conditions. The detection limit was 2.2×10^(−10 ) M. The effect of potential scan rate on the peak potential and peak current of tryptophan was investigated. The correlation of the peak currents against v^(1/2) (v is the scan rate) is linear, which is very similar to a diffusion-controlled process. The proposed biosensor was applied to the determination of Trp in pharmaceuticals formulations successfully.
Yaghoubian, Halimeh,Jahani, Shohreh,Beitollahi, Hadi,tajik, Somayeh,Hosseinzadeh, Rahman,Biparva, Pouria The Korean Electrochemical Society 2018 Journal of electrochemical science and technology Vol.9 No.2
A novel carbon paste electrode modified with $Cu-TiO_2$ nanocomposite, 2-(ferrocenylethynyl)fluoren-9-one (2FF) and ionic liquid (IL) (2FF/$Cu-TiO_2$/IL/CPE) was fabricated and employed to study the electrocatalytic oxidation of droxidopa, using cyclic voltammetry (CV), chronoamperometry (CHA) and differential pulse voltammetry (DPV) as diagnostic techniques. It has been found that the oxidation of droxidopa at the surface of modified electrode occurs at a potential of about 295 mV less positive than that of an unmodified CPE. DPV exhibits a linear dynamic range from $5.0{\times}10^{-8}$ to $4.0{\times}10^{-4}M$ and a detection limit of 30.0 nM for droxidopa. Finally this modified electrode was used for simultaneous determination of droxidopa and tryptophan. Also the 2FF/$Cu-TiO_2$/IL/CPE shows excellent ability to determination of droxidopa and tryptophan in real samples.
Mohaddeseh Savasari,Mostafa Emadi,Mohammad Ali Bahmanyar,Pourya Biparva 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
The synthesis, characterization and application of ascorbic acid-stabilized zero valent iron nanoparticles(AAS-ZVIN) for Cd (II) removal from aqueous solution were studied. The removal efficiency wasinvestigated using central composite design under response surface methodology with consideration offour factors including the dosage of AAS-ZVIN, pH, contact time and initial Cd (II) concentration. Thesynthesized nanoparticles were highly stable and efficient for Cd (II) removal. The numericaloptimization revealed that the optimum removal (79.68%) obtained at AAS-ZVIN dosage of 2 g L 1,initial Cd (II) concentration of 15mgL 1, contact time of 60 min and pH of 7.