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RISS 인기검색어
- 검색키워드
- 저자 : Elena Niculina Dragoi (검색결과 3 건)
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Mohsen Pirdashti,Silvia Curteanu,Kamyar Movagharnejad,Elena Niculina Dragoi,Farshad Rahimpour 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
The complex problem of determining the partition coefficient of the guanidine hydrochloride in aqueoustwo-phase systems has been less studied. For this reason, an artificial neural network was developed topredict the partition coefficients of guanidine hydrochloride in poly (ethylene glycol) 4000/phosphate/guanidine hydrochloride/water system. The neural model (topology and internal structure) wasdetermined using a neuro-evolutionary technique based on differential evolution algorithm, designed indifferent variants. This model was able to predict the guanidine hydrochloride concentrations in eachphase with a mean relative error of 1.4%, which closely matched the experimental data.
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Reza Mostafazadeh,Yasamin Hamidian,Nevin Erk,Elena Niculina Dragoi 한국탄소학회 2023 Carbon Letters Vol.33 No.6
In this work, norepinephrine (NE) was determined by an electrochemical sensor represented by a carbon paste electrode boosted using nitrogen-doped porous carbon (NDPC) derived from Spirulina Platensis microalga anchored CoFe2O4@ NiO and 1-Ethyl-3-methylimidazolium acetate (EMIM Ac) ionic liquid. The morphological characteristics of the catalyst were recorded by field emission scanning electron microscope (FE-SEM) images. Moreover, the electrochemical behavior of norepinephrine on the fabricated electrode was checked using various voltammetric methods. All tests were done at pH 7.0 as the optimized condition in phosphate buffer solution. The results from linear sweep voltammetry revealed that the electro-oxidation of norepinephrine was diffusion, and the diffusion coefficient value was obtained by chronoamperometry (D⁓6.195 × 10– 4). The linear concentration of the modified electrode was obtained from 10 to 500 μM with a limit of detection of 2.26 μM using the square wave voltammetry (SWV) method. The sensor selectivity was investigated using various species, and the results from stability and reproducibility tests showed acceptable values. The sensor's efficiency was tested in urine and pharmaceutical as real samples with recovery percentages between 97.1% and 102.82%.
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Masoud Moradi,Yasser Vasseghian,Alireza Khataee,Mehmet Kobya,Hossein Arabzade,Elena-Niculina Dragoi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.87 No.-
In recent years, novel advanced oxidation processes (AOPs) based on electrochemical technology knownas electrochemical advanced oxidation processes (EAOPs) have been applied to the degradation of a widerange of persistent organic pollutants (POPs). EAOPs produce in situ hydroxyl radicals ( OH) capable ofdegrading POPs and their mineralization by producing stable electrode materials (e.g., boron-dopeddiamond (BDD), doped-SnO2, PbO2, and substoichiometric- and doped-TiO2). Moreover, ozone andsulfate radicals could be produced, based on electrolyte type, which cause the degradation of POPs. Although EAOPs are promising novel technologies, various parameters related to the types of electrodesin the POPs oxidation have not been fully addressed. In order to provide a full and comprehensive pictureof the current state of the art, and improve the treatment efficiency and motivate new researches in theseareas, this study analyzed the research covering EAOPs aspects, with a focus on the comparison ofstability, lifetime and service life of electrodes. Electro-chemical stability and longer life are the majorconcerns in the EAOPs. Since electrodes must be highly efficient for long periods of time, thedetermination of their lifetime is essential. On the other hand, in real-life situations, lifetimedetermination is difficult. The oxidation ability and durability of electrodes during the reactionsdepended on the structural properties of them. Electrodes composed of intermediate compounds had ahigher lifetime than binary oxides. Another factor affecting the stability of the electrodes was thestructure of the expanded mesh style anodes to better control the bubble growth through a polygonizedstructure. Anodes with irregular shapes at the surface were more likely to discharge the bubbles andreduce the negative effects of the high pressure on the surface of the electrode. The electrodes havinghigh oxidation strength and stability, had a shorter service life value. Furthermore, the calcinationtemperature and the amount of applied current directly affected the lifetime of the electrodes. On theother hand, the electrical resistance of the synthesized electrode was effective in the lifetime. Coating ofelectrodes with noble metals such as tantalum, titanium, niobium, zirconium, hafnium, vanadium,molybdate and tungsten improved the electrode stability.
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