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Ali Asghar Ghoreyshi,Fatemeh Gorzin 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.8
Elimination of Cr (VI) from aqueous solution was investigated by a new low cost activated carbon developed from aerobically digested activated sludge (ADAS). The adsorbent demonstrated remarkable characteristics such as high surface area of 760m2·g−1 and large total pore volume of 0.8383 cm3·g−1. The maximum equilibrium uptake of Cr (VI) was 70.15 mg·g−1 at optimum pH 2.0. Interpretation of equilibrium data revealed that the best description was provided by the Freundlich isotherm. The kinetics of Cr (VI) adsorption was well described by the pseudo-second order equation. Calculation of thermodynamic parameters revealed that the adsorption process was endothermic, spontaneous and feasible. The adsorbent was regenerated using NaOH and it was found to be suitable for reuse in successive adsorption-desorption cycles. The desorption efficiency of Cr (VI) ion was up to 78%. Finally, comparison of Cr (VI)adsorption capacity of the developed adsorbent with commercial activated carbon demonstrated its higher performance.
Elaheh Mehrvarz,Ali Asghar Ghoreyshi,Mohsen Jahanshahi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.2
A low-cost activated carbon (AC) was produced from the broom sorghum stalk using KOH as the chemical activating agent, and then the surface of AC was functionalized with diethanolamine to enhance CO2/CH4 selectivity. Characteristics of pristine and DEA-functionalized ACs were determined through different analyses such as Boehm’s method, BET, FT-IR, SEM, and TGA. The adsorption behavior of pure carbon dioxide and pure methane on these adsorbents was investigated in a temperature range of 288-308 K and pressure range of 0-25 bar using an apparatus based on a volumetric method. Results indicated that amine functionalization significantly improved the selectivity of CO2/CH4. The enhancement of CO2 ideal adsorption selectivity over CH4 from 1.51 for the pristine AC to 5.75 for the AC-DEA was attributed to adsorbate-adsorbent chemical interaction. The present DEA-functionalized AC adsorbent can be a good candidate for applications in natural gas and landfill gas purifications.
Nima Nabian,Ali Asghar Ghoreyshi,Ahmad Rahimpour,Mohsen Shakeri 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.11
The performance of gas-liquid membrane contactor for CO2 capture was investigated using a novel polysulfone (PSF) flat membrane prepared via non-solvent phase inversion method. Polyvinyl pyrrolidone (PVP) was used as an additive in the dope solution of PSF membranes. Morphological studies by scanning electron microscopy (SEM) analysis revealed that PSF membrane with PVP has a finger-like structure, but the PSF membrane without PVP has a sponge-like structure. Also, characterization results through atomic force microscopy (AFM) and contact angle measurement demonstrated that the porosity, surface roughness and hydrophobicity of the PSF membrane increased with addition of PVP to the dope solution. Mass transfer resistance analysis, based on CO2 absorption flux, displayed that addition of PVP to the dope solution of PSF membrane decreased membrane mass transfer resistance, and significantly improved CO2 absorption flux up to 2.7 and 1.8 times of absorption fluxes of PSF membrane without PVP and commercial PVDF, respectively.
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.
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.
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).
Aghdas Heidari,Ralph Stahl,Habibollah Younesi,Alimorad Rashidi,Nicole Troeger,Ali Asghar Ghoreyshi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The fast pyrolysis of eucalyptus wood was conducted in a continuous-feed fluidized bed reactor. The effect of pyrolysis temperature, nitrogen flow rate, biomass feed rate and biomass feed size was investigated. The results showed that with increasing nitrogen flow rate, the bio-oil yield firstly increased from 51.9% to 61.1% and then decreased to 59.9%. The maximum percentage of syringol and guaiacol were 16.27 and 8.98 at temperature of 450 and 600 ℃, respectively. The maximum bio-oil yield was 71.1%. The maximum percentage of CO was 44.1 at a flow rate 11.1 L/min, feed size 1.5 and feeding rate 1.7 g/min.
Novel carbon nano-fibers (CNF)/polysulfone (PSf) mixed matrix membranes for gas separation
Mohsen Jahanshahi,Ahmad Rahimpour,Mohsen Jahanshahi,Ali Asghar Ghoreyshi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
Mixedmatrixmembranes (MMM) included of carbon nanofibers (CNFs) fabricated and characterized forgas separation performance. For preparation of MMM, carbon nanofibers content was varied from 0.01 to1 wt% in polysulfone (PSf) casting solution. The fabricated CNFs/PSF MMMs characterized by scanningelectron microscopy (SEM), atomic force microscopy (AFM), ATR–FTIR spectra and pure gas permeationand sorption test. The gas transport properties ofMMMmeasured using single gas permeation set up (N2,O2, CO2, and CH4) at ambient temperature and different feed pressures. Additionally, sorption isothermsformixed matrixmembranesmade for CH4 and CO2. The sorption data were analyzed by the dual-modesorption model. Themorphological studies show that the incorporation of CNFs appreciably changed thesurface properties of membranes. The permeation test showed that the mixed matrix membraneexhibited high permeability. With increasing CNF concentration, CNFs/PSF membrane permeabilityraised from 2.134 to 12.04 Barrer for CO2. The results found that this unique membrane had increasedpermeability and enhanced selectivity. Also it has a great potential to be used practically in gasseparation technology.