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Mostafa Rahimnejad,Ghasem Darzi Najafpour,Ali Asghar Ghoreyshi,Farid Talebnia,Giuliano C. Premier,Gholamreza Bakeri,김중래,오상은 한국미생물학회 2012 The journal of microbiology Vol.50 No.4
Microbial fuel cells (MFCs) have been shown to be capable of clean energy production through the oxidation of biodegradable organic waste using various bacterial species as biocatalysts. In this study we found Saccharomyces cerevisiae,previously known electrochemcially inactive or less active species, can be acclimated with an electron mediator thionine for electrogenic biofilm formation in MFC, and electricity production is improved with facilitation of electron transfer. Power generation of MFC was also significantly increased by thionine with both aerated and non-aerated cathode. With electrochemically active biofilm enriched with swine wastewater, MFC power increased more significantly by addition of thionine. The optimum mediator concentration was 500 mM of thionine with S. cerevisae in MFC with the maximum voltage and current generation in the microbial fuel cell were 420 mV and 700 mA/m2, respectively. Cyclic voltametry shows that thionine improves oxidizing and reducing capability in both pure culture and acclimated biofilm as compared to non-mediated cell. The results obtained indicated that thionine has great potential to enhance power generation from unmediated yeast or electrochemically active biofilm in MFC.
Improvement of sediment microbial fuel cell performance by application of sun light and biocathode
Mostafa Rahimnejad,Zahra Najafgholi 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.1
Three series of experiments were conducted to improve sediment microbial fuel cell (SMFC) performance. At first, dissolved oxygen level of catholyte was increased with native seaweed of the Caspian Sea. Power output was improved about 2-fold, and maximum power density of 46.148mW/m2 was produced in the presence of seaweed as biocathode in cathode compartment. Secondly, the best depth to embed anode was then determined. Anode was embedded in 3, 6, 9 and 12 cm below the sediment/water interface. The best depth to bury the anode was finally determined in 3 cm below the sediment/water interface, maximum generated power and current density of 42.156mW/m2 and 282.92 mA/m2, were respectively obtained in this depth. In addition, influence of agitated flow on power generation from SMFC was investigated.
Farid Talebnia,Moein Mighani,Mostafa Rahimnejad,Irini Angelidaki 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.1
Rapeseed straw was utilized as a cheap rawmaterial for ethanol production. Effects of steam explosionon chemical composition, enzymatic hydrolysis (EH) andsimultaneous saccharification and fermentation (SSF) werestudied. Changes in the pretreatment conditions showedstrong effects on digestibility of the resulting straw. Theoptimum results were obtained at 180°C, 10% solid fraction,1% H2SO4, and 10 min retention time. Under optimalcondition, glucose hydrolysis yields of 93 and 89% wereobtained for 5 and 10% solid fractions, respectively. Thecorresponding ethanol yields were 63 and 67% of maximumtheoretical value. Next, data of the experimental runs wereexploited for modeling the processes by artificial neuralnetworks (ANNs) and performance of the developed modelswas evaluated. The ANN-based models showed a greatpotential for time-course prediction of the studied processes. Efficiency of the joint network for simulating the wholeprocess was also determined and promising results wereobtained.
Sanaz Edrisi,Hamid Bakhshi,Mostafa Rahimnejad 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.5
The partitioning of cephalexin monohydrate in aqueous two-phase system (ATPS) of polyethylene glycol (PEG) with different molecular weights (1000, 2000, 6000, and 8000) and sodium tartrate dihydrate salt was investigated. Equilibrium compositions of two liquid phases were obtained in each system. The experimental data were correlated using the extended NRTL and a modified UNIQUAC (UNIQUAC+DH) models by adding a Debye-Hückel term (DH) to original models for taking into account the long range forces term of activity coefficient of components. The results show that the molecular weight of the polymer has a considerable effect on the partition coefficient of cephalexin monohydrate. The comparison of results for presented models with the experimental data demonstrates that the investigated thermodynamic models can correlate the equilibrium composition very well. The extended NRTL model with AARD of 0.099 is superior to UNIQUAC+DH.
Kasra Pirzadeh,Ali Asghar Ghoreyshi,Mostafa Rahimnejad,Maedeh Mohammadi 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.4
The electrochemical route is a promising and environmentally friendly technique for fabrication of metal organic frameworks (MOFs) due to mild synthesis condition, short time for crystal growth and ease of scale up. A microstructure Cu3(BTC)2 MOF was synthesized through electrochemical path and successfully employed for CO2 and CH4 adsorption. Characterization and structural investigation of the MOF was carried out by XRD, FE-SEM, TGA, FTIR and BET analyses. The highest amount of carbon dioxide and methane sorption was 26.89 and 6.63 wt%, respectively, at 298K. The heat of adsorption for CO2 decreased monotonically, while an opposite trend was observed for CH4. The results also revealed that the selectivity of the developed MOF towards CO2 over CH4 enhanced with increase of pressure and composition of carbon dioxide component as predicted by the ideal adsorption solution theory (IAST). The regeneration of as-synthesized MOF was also studied in six consecutive cycles and no considerable reduction in CO2 adsorption capacity was observed.
Development of a model for dimethyl ether non-adiabatic reactors to improve methanol conversion
Gholamreza Bakeri,Fatemeh Nasrollahi,Ahmad Fauzi Ismail,Mostafa Rahimnejad,Mahdi Imanian 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.10
The modeling of adiabatic and non-adiabatic reactors, using three cooling mediums in the shell side of a shell and tube reactor in cocurrent and countercurrent flow regimes has been conducted. The cooling mediums used in this research are saturated water and methanol feed gas to a reactor which is preheated in the shell side and a special type of oil. The results of adiabatic reactor modeling show good compatibility with the data received from a commercial plant. The results of non-adiabatic reactor modeling showed that more methanol conversion can be achieved in a lower length of reactor, even though in some cases the maximum temperature in the tube side of the reactor is more than the deactivation temperature of the catalyst.
CO2 and N2 adsorption and separation using aminated UiO-66 and Cu3(BTC)2: A comparative study
Kasra Pirzadeh,Kourosh Esfandiari,Ali Asghar Ghoreyshi,Mostafa Rahimnejad 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.3
UiO-66 and Cu3(BTC)2, two well-known metal organic frameworks (MOFs), were aminated through insitu modification approach to improve CO2/N2 separation. UiO-66 was synthesized by solvothermal method, while Cu3(BTC)2 was synthesized with two electrochemical and solvothermal approaches for the sake of comparison. NH2- UiO-66 structure was optimized by evaluating the effect of key parameters, such as synthesis temperature, ligand to metal salt molar ratio, and modulator to metal salt molar ratio, on CO2/N2 selectivity. The effect of different weight percentage of 2-aminoterephthalic acid (NH2-BDC) on electrochemical synthesis of NH2-Cu3(BTC)2 was also investigated. Products were characterized by FTIR, BET, FESEM, XRD, and TGA analyses. Single CO2 adsorption experiment for NH2-UiO-66 showed higher capacity compared to UiO-66. However, for NH2-Cu3(BTC)2, an opposite trend was observed. The CO2 adsorption capacity for NH2-UiO-66 and NH2-Cu3(BTC)2 at 1 bar and 25 oC was 3.32 and 3.86 mmol/g, respectively. CO2/N2 selectivity with fixed concentration ratio (15/85 vol%) was also studied for aminated samples, and the values of 120 and 53 were determined for NH2-UiO-66 and NH2-Cu3(BTC)2, respectively. NH2-Cu3(BTC)2 showed the highest isosteric heat of adsorption among all samples (43 kJ/mol).