Mohammad Enayatzadeh - Academia.edu (original) (raw)
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Papers by Mohammad Enayatzadeh
![Research paper thumbnail of Corrigendum to “Enzymatic degradation of anthracene by the white rot fungus Phanerochaete chrysosporium immobilized on sugarcane bagasse” [J. Hazard. Mater. 161 (2009) 534–537]](https://attachments.academia-assets.com/110002793/thumbnails/1.jpg)
](Journal of Hazardous Materials, 2010
Corrigendum Corrigendum to "Enzymatic degradation of anthracene by the white rot fungus Phaneroch... more Corrigendum Corrigendum to "Enzymatic degradation of anthracene by the white rot fungus Phanerochaete chrysosporium immobilized on sugarcane bagasse" [
Journal of Applied Polymer Science, Mar 23, 2018
In this study, poly(vinylidene fluoride) (PVDF) membranes were prepared using two different solve... more In this study, poly(vinylidene fluoride) (PVDF) membranes were prepared using two different solvents with various polymer concentrations to investigate the predominant kinetic or thermodynamic aspects of membrane preparation in a phase separation process. For this purpose, dimethyl sulfoxide (DMSO) as a weak solvent and N-2-methylpyrrolidone (NMP) as a strong solvent were used with polymer concentrations between 8 and 15 wt %. Scanning electron microscopy and water content, contact angle, and pore size measurements were used to assess the factors affecting the physicochemical properties of the prepared membranes. The results showed that in the case of NMP, the membrane structure is mainly controlled by thermodynamic parameters, while when using DMSO, kinetic parameters are predominant. According to the results, the prepared PVDF-based membranes with DMSO exhibited a relatively denser top layer and less permeation compared to the NMP/PVDF membranes. The difference between the viscosities of the casting solutions with equal polymer concentrations in DMSO and NMP was considered to be the main effective factor in solvent/nonsolvent exchange, resulting in denser top layers in the DMSO/PVDF membranes.
Journal of Applied Polymer Science, 2018
In this study, poly(vinylidene fluoride) (PVDF) membranes were prepared using two different solve... more In this study, poly(vinylidene fluoride) (PVDF) membranes were prepared using two different solvents with various polymer concentrations to investigate the predominant kinetic or thermodynamic aspects of membrane preparation in a phase separation process. For this purpose, dimethyl sulfoxide (DMSO) as a weak solvent and N-2-methylpyrrolidone (NMP) as a strong solvent were used with polymer concentrations between 8 and 15 wt %. Scanning electron microscopy and water content, contact angle, and pore size measurements were used to assess the factors affecting the physicochemical properties of the prepared membranes. The results showed that in the case of NMP, the membrane structure is mainly controlled by thermodynamic parameters, while when using DMSO, kinetic parameters are predominant. According to the results, the prepared PVDF-based membranes with DMSO exhibited a relatively denser top layer and less permeation compared to the NMP/PVDF membranes. The difference between the viscosities of the casting solutions with equal polymer concentrations in DMSO and NMP was considered to be the main effective factor in solvent/nonsolvent exchange, resulting in denser top layers in the DMSO/PVDF membranes.
Journal of Polymer Research, 2019
Influence of the dope solution concentration on final membrane properties, regarding TiO 2 role, ... more Influence of the dope solution concentration on final membrane properties, regarding TiO 2 role, was investigated. For this purpose, blended flat sheet poly(vinylidene fluoride) (PVDF)-based membranes with different proportions of poly(vinyl pyrrolidone) (PVP)/ TiO 2 ratios were prepared via phase inversion process. The final application of the membranes was evaluated, especially in contact with vital microbial mixed liquor, in membrane bioreactors due to antibacterial properties of TiO 2 and environmentally concern of nanoparticles application. Response surface methodology (RSM) was used as a precise and multivariate technique to estimate and navigate the system performance at any experimental point within the investigation domain. Filtration properties, flux recovery ratio and (Protein flux / pure water flux: Jp/Jw) ratio of the membranes were investigated statistically to propose the formulations for the optimal performance. The correlation showed good agreement with the measured pure water flux and flux recovery ratio values of the fabricated membranes, with R 2 values higher than 90%. The findings are significant since demonstrating that the loaded nano TiO 2 particles around 0.5 wt% improve pure water flux, however, based on the Pareto analysis, experimental values and environmental safety concern, nanoparticles loading can be neglected in comparison with the other factors investigated in this study.
Journal of Hazardous Materials, 2010
Corrigendum Corrigendum to "Enzymatic degradation of anthracene by the white rot fungus Phaneroch... more Corrigendum Corrigendum to "Enzymatic degradation of anthracene by the white rot fungus Phanerochaete chrysosporium immobilized on sugarcane bagasse" [
Journal of Applied Polymer Science, Mar 23, 2018
In this study, poly(vinylidene fluoride) (PVDF) membranes were prepared using two different solve... more In this study, poly(vinylidene fluoride) (PVDF) membranes were prepared using two different solvents with various polymer concentrations to investigate the predominant kinetic or thermodynamic aspects of membrane preparation in a phase separation process. For this purpose, dimethyl sulfoxide (DMSO) as a weak solvent and N-2-methylpyrrolidone (NMP) as a strong solvent were used with polymer concentrations between 8 and 15 wt %. Scanning electron microscopy and water content, contact angle, and pore size measurements were used to assess the factors affecting the physicochemical properties of the prepared membranes. The results showed that in the case of NMP, the membrane structure is mainly controlled by thermodynamic parameters, while when using DMSO, kinetic parameters are predominant. According to the results, the prepared PVDF-based membranes with DMSO exhibited a relatively denser top layer and less permeation compared to the NMP/PVDF membranes. The difference between the viscosities of the casting solutions with equal polymer concentrations in DMSO and NMP was considered to be the main effective factor in solvent/nonsolvent exchange, resulting in denser top layers in the DMSO/PVDF membranes.
Journal of Applied Polymer Science, 2018
In this study, poly(vinylidene fluoride) (PVDF) membranes were prepared using two different solve... more In this study, poly(vinylidene fluoride) (PVDF) membranes were prepared using two different solvents with various polymer concentrations to investigate the predominant kinetic or thermodynamic aspects of membrane preparation in a phase separation process. For this purpose, dimethyl sulfoxide (DMSO) as a weak solvent and N-2-methylpyrrolidone (NMP) as a strong solvent were used with polymer concentrations between 8 and 15 wt %. Scanning electron microscopy and water content, contact angle, and pore size measurements were used to assess the factors affecting the physicochemical properties of the prepared membranes. The results showed that in the case of NMP, the membrane structure is mainly controlled by thermodynamic parameters, while when using DMSO, kinetic parameters are predominant. According to the results, the prepared PVDF-based membranes with DMSO exhibited a relatively denser top layer and less permeation compared to the NMP/PVDF membranes. The difference between the viscosities of the casting solutions with equal polymer concentrations in DMSO and NMP was considered to be the main effective factor in solvent/nonsolvent exchange, resulting in denser top layers in the DMSO/PVDF membranes.
Journal of Polymer Research, 2019
Influence of the dope solution concentration on final membrane properties, regarding TiO 2 role, ... more Influence of the dope solution concentration on final membrane properties, regarding TiO 2 role, was investigated. For this purpose, blended flat sheet poly(vinylidene fluoride) (PVDF)-based membranes with different proportions of poly(vinyl pyrrolidone) (PVP)/ TiO 2 ratios were prepared via phase inversion process. The final application of the membranes was evaluated, especially in contact with vital microbial mixed liquor, in membrane bioreactors due to antibacterial properties of TiO 2 and environmentally concern of nanoparticles application. Response surface methodology (RSM) was used as a precise and multivariate technique to estimate and navigate the system performance at any experimental point within the investigation domain. Filtration properties, flux recovery ratio and (Protein flux / pure water flux: Jp/Jw) ratio of the membranes were investigated statistically to propose the formulations for the optimal performance. The correlation showed good agreement with the measured pure water flux and flux recovery ratio values of the fabricated membranes, with R 2 values higher than 90%. The findings are significant since demonstrating that the loaded nano TiO 2 particles around 0.5 wt% improve pure water flux, however, based on the Pareto analysis, experimental values and environmental safety concern, nanoparticles loading can be neglected in comparison with the other factors investigated in this study.