This article describes kinetic modeling of the reduction of barium sulfate by methane based on ex... more This article describes kinetic modeling of the reduction of barium sulfate by methane based on experimental data obtained by thermogravimetric technique. The conversiontime data have been interpreted by using the grain model for gas-solid reactions and the effect of catalyst on ...
The potential use of novel iron based mineral catalysts as an effective and available material fo... more The potential use of novel iron based mineral catalysts as an effective and available material for electrocatalytic oxidation of refractory contaminants by heterogeneous electro-Fenton (HEF) process was studied for the first time. For this purpose, four natural catalysts, namely ilmenite (FeTiO3), pyrite (FeS2), chromite (FeCr2O4), and chalcopyrite (CuFeS2) were selected as the source of ferrous iron (Fe2+) ions. The catalyst samples were appropriately characterized by X-ray diffraction (XRD) and RAMAN analysis. The degradation kinetics and mineralization rate of 0.2 mM antibiotic cefazolin (CFZ), as a contaminant of emerging concern, were comparatively investigated by HEF using the catalysts mentioned above. The effect of important experimental parameters such as catalysts loading and current on the process efficiency was investigated. Moreover, the performance of these new mineral catalysts was compared in term of CFZ degradation kinetics, mineralization power, mineralization curr...
To stay competitive in a business environment, continuous performance evaluation based on the tri... more To stay competitive in a business environment, continuous performance evaluation based on the triple bottom line standard of sustainability is necessary. There is a gap in addressing the computational expense caused by increased decision units due to increasing the performance evaluation indices to more accuracy in the evaluation. We successfully addressed these two gaps through (1) using principal component analysis (PCA) to cut the number of evaluation indices, and (2) since PCA itself has the problem of merely using the data distribution without considering the domain-related knowledge, we utilized Analytic Hierarchy Process (AHP) to rank the indices through the expert’s domain-related knowledge. We propose an integrated approach for sustainability performance assessment in qualitative and quantitative perspectives. Fourteen insurance companies were evaluated using eight economic, three environmental, and four social indices. The indices were ranked by expert judgment through an ...
A new nanocomposite was synthesized by curing of diglycidyl ether of bisphenol A (DGEBA)/polyprop... more A new nanocomposite was synthesized by curing of diglycidyl ether of bisphenol A (DGEBA)/polypropylenimine octaamine dendrimer (PPOD) involving various percentages of Fe2O3 nanoparticles using ultrasonic dispersion protocol. DSC and DMTA studies revealed that high percentage of the nanofiller, i.e., 10%, results in improved cross-link density as evidenced by increasing in the glass transition temperature. Morphology studies using AFM and TEM showed that the nanoparticles were homogeneously dispersed into the entire volume of the resin. From the experimental data, the nanocomposite exhibited increase in storage modulus and degradation temperature from the neat epoxy system. The isoconversional method was utilized to describe the isothermal curing reaction of epoxy nanocomposite. Kinetics of DGEBA/PPOD/nano-Fe2O3 cure was studied by DSC measurements at isothermal mode. Isothermal kinetic parameters, including k1, k2 and n, were determined and it was shown that the reaction kinetics could be described well by the Horie model.
Vancomycin crystalline degradation products (CDPs) have been introduced as one of the newest and ... more Vancomycin crystalline degradation products (CDPs) have been introduced as one of the newest and most interesting derivatives of vancomycin for enantiomer separation of a wide variety of chiral compounds. In this attempt, a chiral stationary phase (CSP) has been prepared using diol silica gel based on vancomycin CDPs which led to a new chiral selector with new functionality of functional groups on a microcolumn LC. Different kinds of mobile phases were examined to realize the behavior of the chiral selector in separation of atropine, fluoxetine, amlodipine, mandelic acid, alanine, and phenylalanine which were separated successfully on this column. Good results were obtained by using a polar mobile phase containing water, methanol, and acid additives for separation of chiral acidic compounds and amino acid samples. Considerable results were obtained for analysis of basic compounds by using polar organic mobile phase (POP) containing methanol, acid and base additives. These results ca...
Development of inexpensive and simple culture media is always favorable for recombinant protein o... more Development of inexpensive and simple culture media is always favorable for recombinant protein over-expression in E. coli. The effects of medium composition on the production of recombinant human granulocyte-colony stimulating factor (rh-GCSF) were investigated in batch culture of E. coli BL21 (DE3) [pET23a-hgcsf]. First, the optimum medium for production of rh-GCSF was determined; and, then it was shown that mixture of amino acid addition at induction time, which was determined on the basis of amino acids frequency in the recombinant protein, increases recombinant protein expression level significantly. Furthermore, the effect of glucose concentration on productivity of rh-GCSF was investigated; 20 g/l of glucose will result in maximum attainable biomass and rh-GCSF in this process. At optimum conditions, a cell dry weight of 10.5 g/l, an expression level of about 35% of total cellular protein, rh-GCSF concentration of 1.75 +/- 0.1 g/l, and overall rh-GCSF yield of 165 +/- 5 mg/g were obtained.
This article describes kinetic modeling of the reduction of barium sulfate by methane based on ex... more This article describes kinetic modeling of the reduction of barium sulfate by methane based on experimental data obtained by thermogravimetric technique. The conversiontime data have been interpreted by using the grain model for gas-solid reactions and the effect of catalyst on ...
The potential use of novel iron based mineral catalysts as an effective and available material fo... more The potential use of novel iron based mineral catalysts as an effective and available material for electrocatalytic oxidation of refractory contaminants by heterogeneous electro-Fenton (HEF) process was studied for the first time. For this purpose, four natural catalysts, namely ilmenite (FeTiO3), pyrite (FeS2), chromite (FeCr2O4), and chalcopyrite (CuFeS2) were selected as the source of ferrous iron (Fe2+) ions. The catalyst samples were appropriately characterized by X-ray diffraction (XRD) and RAMAN analysis. The degradation kinetics and mineralization rate of 0.2 mM antibiotic cefazolin (CFZ), as a contaminant of emerging concern, were comparatively investigated by HEF using the catalysts mentioned above. The effect of important experimental parameters such as catalysts loading and current on the process efficiency was investigated. Moreover, the performance of these new mineral catalysts was compared in term of CFZ degradation kinetics, mineralization power, mineralization curr...
To stay competitive in a business environment, continuous performance evaluation based on the tri... more To stay competitive in a business environment, continuous performance evaluation based on the triple bottom line standard of sustainability is necessary. There is a gap in addressing the computational expense caused by increased decision units due to increasing the performance evaluation indices to more accuracy in the evaluation. We successfully addressed these two gaps through (1) using principal component analysis (PCA) to cut the number of evaluation indices, and (2) since PCA itself has the problem of merely using the data distribution without considering the domain-related knowledge, we utilized Analytic Hierarchy Process (AHP) to rank the indices through the expert’s domain-related knowledge. We propose an integrated approach for sustainability performance assessment in qualitative and quantitative perspectives. Fourteen insurance companies were evaluated using eight economic, three environmental, and four social indices. The indices were ranked by expert judgment through an ...
A new nanocomposite was synthesized by curing of diglycidyl ether of bisphenol A (DGEBA)/polyprop... more A new nanocomposite was synthesized by curing of diglycidyl ether of bisphenol A (DGEBA)/polypropylenimine octaamine dendrimer (PPOD) involving various percentages of Fe2O3 nanoparticles using ultrasonic dispersion protocol. DSC and DMTA studies revealed that high percentage of the nanofiller, i.e., 10%, results in improved cross-link density as evidenced by increasing in the glass transition temperature. Morphology studies using AFM and TEM showed that the nanoparticles were homogeneously dispersed into the entire volume of the resin. From the experimental data, the nanocomposite exhibited increase in storage modulus and degradation temperature from the neat epoxy system. The isoconversional method was utilized to describe the isothermal curing reaction of epoxy nanocomposite. Kinetics of DGEBA/PPOD/nano-Fe2O3 cure was studied by DSC measurements at isothermal mode. Isothermal kinetic parameters, including k1, k2 and n, were determined and it was shown that the reaction kinetics could be described well by the Horie model.
Vancomycin crystalline degradation products (CDPs) have been introduced as one of the newest and ... more Vancomycin crystalline degradation products (CDPs) have been introduced as one of the newest and most interesting derivatives of vancomycin for enantiomer separation of a wide variety of chiral compounds. In this attempt, a chiral stationary phase (CSP) has been prepared using diol silica gel based on vancomycin CDPs which led to a new chiral selector with new functionality of functional groups on a microcolumn LC. Different kinds of mobile phases were examined to realize the behavior of the chiral selector in separation of atropine, fluoxetine, amlodipine, mandelic acid, alanine, and phenylalanine which were separated successfully on this column. Good results were obtained by using a polar mobile phase containing water, methanol, and acid additives for separation of chiral acidic compounds and amino acid samples. Considerable results were obtained for analysis of basic compounds by using polar organic mobile phase (POP) containing methanol, acid and base additives. These results ca...
Development of inexpensive and simple culture media is always favorable for recombinant protein o... more Development of inexpensive and simple culture media is always favorable for recombinant protein over-expression in E. coli. The effects of medium composition on the production of recombinant human granulocyte-colony stimulating factor (rh-GCSF) were investigated in batch culture of E. coli BL21 (DE3) [pET23a-hgcsf]. First, the optimum medium for production of rh-GCSF was determined; and, then it was shown that mixture of amino acid addition at induction time, which was determined on the basis of amino acids frequency in the recombinant protein, increases recombinant protein expression level significantly. Furthermore, the effect of glucose concentration on productivity of rh-GCSF was investigated; 20 g/l of glucose will result in maximum attainable biomass and rh-GCSF in this process. At optimum conditions, a cell dry weight of 10.5 g/l, an expression level of about 35% of total cellular protein, rh-GCSF concentration of 1.75 +/- 0.1 g/l, and overall rh-GCSF yield of 165 +/- 5 mg/g were obtained.
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