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The effect of pressure on removal of carbon monoxide in biofilter
Morteza Hosseini 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.2
Solubility of carbon monoxide in water is very important for its biological oxidation or removal process of gaseous pollutants. Present research shows the effect of pressure on solubility of carbon monoxide in liquid phase and its removal process by a biofilter. The results are considered as laboratory research on carbon monoxide elimination. In this method a pressurized trickle-bed biofilter was used to increase pressure in the reactor. The biofilter was filled with Leca-stones and inoculated with microorganisms. When the system’s pressure is increased, the solubility of carbon monoxide will be increased, respectively, and it causes a better reaction of the microorganisms for removing of gaseous pollutants. The efficiency was improved significantly by increasing the pressure in the reactor.
Kazem Alinezhad,Morteza Hosseini,Kamyar Movagarnejad,Mehdi Salehi 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
In many ways, the use of high electrostatic fields in the separation of water-in-oil emulsions is a mature technology, with most developments arising from attempts to improve the process of crude oils, in terms of the separation of water, salt or other hydrophilic impurities. In this way, different mechanisms have been proposed until now and several parameters have been studied to estimate the level of separation. In this work, after a review of the process and its application, new results are presented for AC currents under non-uniform electrical fields (dielectrophoresis)on the water-in-crude oil emulsion. Then the effects of voltage, temperature, volume fraction and API are studied on degree of separation. Finally, a correlation is presented among these parameters by an experimental model.
Fatemeh Banisheykholeslami,Morteza Hosseini,Ghasem Najafpour Darzi,Mohammad Reza Shirzad Kebria 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.4
A novel hyper-branched alumoxane with dendritic structure (Alu-Den) was prepared via a polycondensation reaction between hydroxyl groups of boehmite and carboxylic groups of gallic acid for use as an adsorbent for elimination of cationic Methylene blue from aqueous media. The successful formation of tree-like structure of Alu-Den was confirmed by several analyses, including FTIR, XRD, FE-SEM, BET, DLS and TGA. Adsorption variables, such as adsorbent dosage and pH, were optimized to acquire the maximum efficiency for dye removal. The results indicated that 0.02 g Alu-Den can totally eliminate 10 ml Methylene blue with concentration of 20 mg/l at 288 K and pH=10. In case of visionary investigation, the sorption process conformed to the pseudo-second-order kinetic model for all prepared concentrations. The Langmuir, Freundlich and Sips isotherms were evaluated to define the interaction between dye molecules and dendritic alumoxane structures. The results showed that the empirical data were in agreement with the Sips isotherm. Additionally, the spontaneous and exothermic quiddity of Methylene blue adsorption onto Alu-Den surface was divulged by thermodynamics assessments. Eventually, the Alu-Den was regenerated following four time adsorption-desorption cycles without significant loss in adsorption capacity. Hence, owing to its biocompatibility, simply accessible precursors, and high recyclability, the present novel adsorbent offered superior potential for the elimination of cationic dyes from aqueous phase.
Shiva Dehghan Abkenar,Morteza Hosseini,Zohreh Dahaghin,Masoud Salavati-Niasari,Mohammad Reza Jamali 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.10
A novel method was developed for the speciation of chromium in natural water samples based on homogeneous liquid-liquid extraction and determination by flame atomic absorption spectrometry (FAAS). In this method, Cr(III)reacts with a new Schiff's base ligand to form the hydrophobic complex, which is subsequently entrapped in the sediment phase, whereas Cr(VI) remained in aqueous phase. The Cr(VI) assay is based on its reduction to Cr(III) by the addition of sodium sulfite to the sample solution. Thus, separation of Cr(III) and Cr(VI) could be realized. Homogeneous liquid-liquid extraction based on the pH-independent phase-separation process was investigated using a ternary solvent system (water-tetrabutylammonium ion (TBA+)-chloroform) for the preconcentration of chromium. The phase separation phenomenon occurred by an ion-pair formation of TBA and perchlorate ion. Then sedimented phase was separated using a 100 μL micro-syringe and diluted to 1.0 mL with ethanol. The sample was introduced into the flame by conventional aspiration. After the optimization of complexation and extraction conditions such as pH = 9.5, [ligand] = 1.0 × 10‒4 M, [TBA+] = 2.0 × 10‒2 M, [CHCl3] = 100.0 μL and [ClO4‒] = 2.0 × 10‒2 M, a preconcentration factor (Va/Vs) of 100 was obtained for only 10 mL of the sample. The relative standard deviation was 2.8% (n = 10). The limit of detection was sufficiently low and lie at ppb level. The proposed method was applied for the extraction and determination of chromium in natural water samples with satisfactory results.
Integrating Genetic Data into Electronic Health Records: Medical Geneticists’ Perspectives
Haleh Ayatollahi,Seyedeh Fatemeh Hosseini,Morteza Hemmat 대한의료정보학회 2019 Healthcare Informatics Research Vol.25 No.4
Objectives: Genetic disorders are the main causes of many other diseases. Integrating genetic data into Electronic Health Records (EHRs) can facilitate the management of genetic information and care of patients in clinical practices. The aim of this study was to identify the main requirements for integrating genetic data into the EHR system from the medical geneticists’ perspectives. Methods: The research was completed in 2018 and consisted of two phases. In the first phase, the main requirements for integrating genetic data into the EHR system were identified by reviewing the literature. In the second phase, a 5-point Likert scale questionnaire was developed based on the literature review and the results derived from the first phase. Then, the Delphi method was applied to reach a consensus about the integration requirements. Results: The findings of the first phase showed that data elements, including patients’ and healthcare providers’ personal data, clinical and genetic data, technical infrastructure, security issues and functional requirements, should be taken into account before data integration. In the second phase, a consensus was reached for most of the items (mean ≥3.75). The items with a mean value of less than 2.5 did not achieve a consensus and were removed from the final list. Conclusions: The integration of genetic data into the EHRs can provide a ground for increasing accuracy and precision in the diagnosis and treatment of genetic disorders. Such integration requires adequate investments to identify users’ requirements as well as technical and non-technical issues
Abkenar, Shiva Dehghan,Hosseini, Morteza,Dahaghin, Zohreh,Salavati-Niasari, Masoud,Jamali, Mohammad Reza Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.10
A novel method was developed for the speciation of chromium in natural water samples based on homogeneous liquid-liquid extraction and determination by flame atomic absorption spectrometry (FAAS). In this method, Cr(III) reacts with a new Schiff's base ligand to form the hydrophobic complex, which is subsequently entrapped in the sediment phase, whereas Cr(VI) remained in aqueous phase. The Cr(VI) assay is based on its reduction to Cr(III) by the addition of sodium sulfite to the sample solution. Thus, separation of Cr(III) and Cr(VI) could be realized. Homogeneous liquid-liquid extraction based on the pH-independent phase-separation process was investigated using a ternary solvent system (water-tetrabutylammonium ion ($TBA^+$)-chloroform) for the preconcentration of chromium. The phase separation phenomenon occurred by an ion-pair formation of TBA and perchlorate ion. Then sedimented phase was separated using a $100\;{\mu}L$ micro-syringe and diluted to 1.0 mL with ethanol. The sample was introduced into the flame by conventional aspiration. After the optimization of complexation and extraction conditions such as pH = 9.5, [ligand] = $1.0{\times}10^{-4}\;M$, [$TBA^+$] = $2.0{\times}10^{-2}\;M$, [$CHCl_3$] = $100.0\;{\mu}L$ and [$ClO_4$] = $2.0{\times}10{-2}\;M$, a preconcentration factor (Va/Vs) of 100 was obtained for only 10 mL of the sample. The relative standard deviation was 2.8% (n = 10). The limit of detection was sufficiently low and lie at ppb level. The proposed method was applied for the extraction and determination of chromium in natural water samples with satisfactory results.
Novel Thallium(I)-Selective Membrane Electrode Based on a Podal Ligand
Ganjali, Mohammad Reza,Pourjavid, Mohammad Reza,Mouradzadegun, Arash,Hosseini, Morteza,Mizani, Farhang Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.11
A PVC-based membrane electrode for thallium(I) ions based on 1,21,23,25-tetramethyl-2,20: 3,19-dimetheno-[H, 2] H, 23H, 25H-bis-[1,3] dioxocino[5,4-i:5',4'-i] benzo [1,2-d: 5.4-d'] bis [1,3] benzodioxocin(II) has been prepared. The electrode displays a linear dynamic range of $1.0{\times}10^{-1}-1.0{\times}10^{-5}$ M, with a Nernstian slope of $59.8{\pm}0.2\;mV\;{decad^-1}$, and a detection limit $5.0{\times}10^{-6}$ M. It has a very fast response time of<10 s and can be used for at least ten weeks without a considerable divergence in potentials. This electrode revealed comparatively good selectivity with respect to alkali, alkaline earth, and some transition and heavy metal ions and was effective in a pH range of 2.0-10.0. It was used as an indicator electrode in potentiometric titration of thallium ion with sulfide ion.
Ganjali, Mohammad Reza,Babaei, Leila Hajiagha,Taghvaei-Ganjali, Saeed,Modjallal, Atoosa,Sahmsipur, Mojtaba,Hosseini, Morteza,Javanbakht, Mehran Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.2
A PVC membrane electrode for silver ion based on a new cone shaped calix[4]arene (CASCA) as membrane carrier was prepared. The electrode exhibits a Nernstian response for $Ag^+$ over a wide concentration range ($1.0{\times}10^{-1}-8.0{\times}10^{-6}$M) with a slope of 58.2 {\pm}$ 0.5 mV per decade. The limit of detection of the sensor is $5.0{\times}10^{-6}$M. The sensor has a very fast response time (~5 s) in the concentration range of ${\leq}=1.0{\times}10^{-3}$ M, and a useful working pH range of 4.0-9.5. The proposed sensor displays excellent discriminating ability toward $Ag^+$ ion with respect to common alkali, alkaline earth, transition and heavy metal ions. It was used as an indicator electrode in potentiometric titration of $Ag^+$ with EDTA and in direct determination of silver ion in wastewater of silver electroplating.