Khalid Turki | University of Technology/Iraq (original) (raw)

Papers by Khalid Turki

Engineering and Technology Journal

The inhibition behavior of Dimethylethanolamin (DMEA) on corrosion 7613 Aluminum alloy in 0.6 M N... more The inhibition behavior of Dimethylethanolamin (DMEA) on corrosion 7613 Aluminum alloy in 0.6 M NaCl solution have been investigated using weight loss, polarization techniques .Five different concentrations (2*10-3 , 4*10-3 , 6*10-3 , 8*10-3 and 10*10-3) M of (DMEA) were studded at 25 0 C. Also examine of temperature effect (25, 35, 45) 0 C on the inhibitor efficiency .The results indicated that the inhibition occurs by absorption of inhibitor molecules on the metal surface. The inhibition efficiency (I %) was found to increase with increasing inhibitor concentration and decreasing with increasing temperature. For inhibitor concentration close to (8*10-3 M) maximum inhibition efficiency obtained was 92 %. Above this inhibitor concentration value in the solution the inhibitor efficiency decreases. Polarization measurements showed that the DMEA act as a mixed type inhibitor. The corrosion potential (E corr.) values shifted to less negative values by increasing the concentration of DMEA in the solution up to (8*10-3 M). Adsorption of DMEA on the surface of Aluminum is found to obey the Langmuir isotherm

Water Science and Technology

The preparation, modification and application of green polymers such as poly-lactic acid (PLA), c... more The preparation, modification and application of green polymers such as poly-lactic acid (PLA), chitosan (CS), and cellulose acetate (CA) for oily wastewater treatment is summed up in this review. Due to the low environmental pollution, good chemical resistivity, high hydrophobicity, and good capacity for water-oil emulsion separation of the presented polymers, it then highlights the various membrane production methods and their role in producing effective membranes, with a focus on recent advances in improving membrane properties through the addition of various Nano materials. As a result, the hydrophilic/hydrophobic properties that are critical in the oil separation mechanism are highlighted. Finally, it looks at the predictions and challenges in oil/water separation and recovery. These ideas are discussed with a focus on modern production methods and oil separation proficiency.

International Journal of Food Engineering

In current paper, a comprehensive review to contribute the present insight an implementations and... more In current paper, a comprehensive review to contribute the present insight an implementations and the recent improvements through the diverse endeavor made by the researchers utilizing a membrane technique for degumming, deacidifying, dewaxing and discoloration edible vegetable oils with and without solvent availability and also the solvent recovery has been evaluated. Endeavors made with NF, UF, MF and non-porous membranes, have shown the capability of these membranes to predicate vegetable oil treatment. A membrane technique is noticeably simple and potentially provides many usefulness in vegetable oil purification. It appears that oils treatment with membranes, which carried out at low temperatures that provides saving energy, with real cancellation of stages, provides a promising alternate to conventional procedure, towards the accomplishment of eco-friendly and cost-effective operations that are technically sophisticated. Generally, the solvent (hexane-dilution) technique enhan...

Sustainability

Fuel cells have lately received growing attention since they allow the use of non-precious metals... more Fuel cells have lately received growing attention since they allow the use of non-precious metals as catalysts, which reduce the cost per kilowatt of power in fuel cell devices to some extent. Until recent years, the major barrier in the development of fuel cells was the obtainability of highly conductive anion exchange membranes (AEMs). On the other hand, improvements show that newly enhanced anion exchange membranes have already reached high conductivity levels, leading to the suitable presentation of the cell. Currently, an increasing number of studies have described the performance results of fuel cells. Much of the literature reporting cell performance is founded on hydrogen‒anion exchange membrane fuel cells (AEMFCs), though a growing number of studies have also reported utilizing fuels other than hydrogen—such as alcohols, non-alcohol C-based fuels, and N-based fuels. This article reviews the types, performance, utilized membranes, and operational conditions of anion exchange...

In present work, The corrosion behavior of carbon steel in sodium chloride (NaCl) solution with d... more In present work, The corrosion behavior of carbon steel in sodium chloride (NaCl) solution with different concentrations was studied .Effects of mixing speed (0 to 2220) r.p.m and the solution temperature (25, 35, 45, 55, 65) 0 c on cathodic protection current density were studied, that would provide a full cathodic protection for tube metal specimen of carbon steel immersed in 3.5% NaCl solution by sacrificial anode method using magnesium (Mg) as sacrificial anode. The results show that the concentration of sodium chloride in the electrolyte is an important factor in determining corrosion rate, 3.5 % concentration of sodium chloride gives maximum rate of corrosion. In addition, it has been found that the cathodic protection current density showed sharp increasing with mixing speed. The results have showed also that the cathodic protection current density increased with increasing the solution temperature and shifts the protection potential to high negative value.

International Journal of Research, 2020

The (UF) membrane technologies are very efficient for the treatment of industrial wastewater and ... more The (UF) membrane technologies are very efficient for the treatment of industrial wastewater and solution containing heavy and radioactive elements to reduce water consumption and preserving the environment. After leaching process for phosphogypsum by water deionized and obtain on a solution that contains heavy and radioactive elements (Cu, Zn, Pb, Cd, U, Ni, K, and Th ), were subjected to treatment by UF system in the laboratory. The results showed that Polymers blending have an improvement in the morphological structure of the membranes. The addition of PES has improved the characteristics of the membrane such as the mean pore size, narrower pore size distribution and membrane hydrophilicity. The results showed that, the porosity was (61.31%) for (PPSU 20%-PES 3%) and it was increased to (72.3%) when the concentration was increased to (PPSU 20%-PES 4%) and then decreasing to (51.12%) at the concentration (PPSU 20%-PES 5%). The least value of the porosity was for the membrane pre...

2ND INTERNATIONAL CONFERENCE ON MATERIALS ENGINEERING & SCIENCE (IConMEAS 2019), 2020

Http Dx Doi Org 10 1080 13602008608715970, Mar 20, 2007

Water

This work presents poly(terephthalic-co-glycerol-g-fumaric acid) (TGF) as a novel water-soluble p... more This work presents poly(terephthalic-co-glycerol-g-fumaric acid) (TGF) as a novel water-soluble polymeric nano-additive for the modification of a polyethersulfone ultrafiltration membrane. The TGF was harnessed as a pore former, aiming to improve the membrane surface porosity and hydrophilicity. Modified membranes were characterized to observe the influence of varying the TGF content on their hydrophilicity, porosity, morphological structure, and composition, as well as their entire performance. The results disclosed that porosity and hydrophilicity of the modified membrane prepared using 4 wt.% TGF content recorded an enhancement by 24% and 38%, respectively. Herein, the lower contact angle was mainly a reflection of the improved porosity, but not of the hydrophilic nature of water-soluble TGF. Furthermore, upon increasing the TGF content in the polymeric matrix, a more porous structure with longer finger-like micropores was formed. Moreover, a sponge-like layer clearly appeared ne...

Brazilian Journal of Chemical Engineering, 2021

Herein, we described the synthesis process of highly durable and eco-friendly alkaline anion-exch... more Herein, we described the synthesis process of highly durable and eco-friendly alkaline anion-exchange polyvinyl alcohol/chitosan (PVA–CS) membranes through a casting solution technique for fuel cell application. The blended membranes were then cross-linked with formaldehyde and glutaraldehyde, or plasticized by glycerol. PVA–CS (98/2) % blend, (7% CS) cross-linked with 25% formaldehyde and glutaraldehyde, and (4% CS) plasticized with 25% glycerol, were adopted to prepare four different composite membranes. Characterization tools were implemented to probe the morphology and permeation of the synthesized membranes, including SEM and FTIR. The performance of these membranes was assessed through anion exchange membrane fuel cell applications. The properties of anion exchange membranes including their water uptake, alkaline uptake, swelling ratio, ion exchange capacity (IEC), and ionic conductivity were determined. Membranes cross-linked with glutaraldehyde manifested the higher ionic co...

Chemical Engineering Research and Design, 2022

Phase inversion technique has been utilized to prepare Poly (vinylidene fluoride-co-hexafluoropro... more Phase inversion technique has been utilized to prepare Poly (vinylidene fluoride-co-hexafluoropropylene) PVDF-co-HFP, hollow fiber membranes. Polyvinylpyrrolidone (PVP) with 9 wt. %. added as a pore former additives to the polymer dope solution. Characteristics of the PVDF-co-HFP hollow fiber membrane with / without PVP particles have been studied. It was found that the membrane prepared without PVP additives has a low porosity and a high contact angle. Existence the PVP additives of 9 wt. % causing the increase of the membrane porosity by 28 %.Whilst increase PVP content resulting in decrease of membrane hydrophobicity. MD experiment was done using a direct contact membrane distillation (DCMD) configuration as crucial test to investigate performance of product PVDF-co-HFP hollow fiber membrane. Increase the amount of PVP to 9 wt. % in dope solution, this in turn leads to an increased the permeate flux from of 4.5 to 15.8 Kg/m2.h at 70 oC The effect of operating conditions such as f...

A Poly (vinylidene fluoride-co-hexafluoropropylene), (PVDF-co-HFP) hollow fiber membrane was prep... more A Poly (vinylidene fluoride-co-hexafluoropropylene), (PVDF-co-HFP) hollow fiber membrane was prepared by phase inversion method using different concentrations of PVP as a pore former additives in the dope solution. Surface modification was done using a formic acid through immersion technique. It was observed that the contact angle for all membranes increased due to the surfaces modification (10% of hydrophobicity increment).This study shows that the hydrophobicity of (PVDF-co-HFP) hollow fiber membrane can be enhanced via formic acid surface modification process.

Phase inversion technique has been utilized to prepare Poly (vinylidene fluoride-co-hexafluoropro... more Phase inversion technique has been utilized to prepare Poly (vinylidene fluoride-co-hexafluoropropylene) PVDF- co-HFP, hollow fiber membranes. Polyvinylpyrrolidone (PVP) with 9 wt. %. added as a pore former additives to the polymer dope solution. Characteristics of the PVDF-co-HFP hollow fiber membrane with / without PVP particles have been studied. It was found that the membrane prepared without PVP additives has a low porosity and a high contact angle. Existence the PVP additives of 9 wt. % causing the increase of the membrane porosity by 28 %.Whilst increase PVP content resulting in decrease of membrane hydrophobicity. MD experiment was done using a direct contact membrane distillation (DCMD) configuration as crucial test to investigate performance of product PVDF-co-HFP hollow fiber membrane. Increase the amount of PVP to 9 wt. % in dope solution, this in turn leads to an increased the permeate flux from of 4.5 to 15.8 Kg/m2.h at 70 oC The effect of operating conditions such as ...

Engineering and Technology Journal, 2021

Cancers, 2021

Despite the potential apoptotic functions, the CD95/CD95L system can stimulate survival as well a... more Despite the potential apoptotic functions, the CD95/CD95L system can stimulate survival as well as pro-inflammatory signaling, particularly through the activation of NFκB. This holds true for the TNF/TNFR and the TRAIL/TRAILR systems. Thus, signaling pathways of these three death ligands converge, yet the specific impact of the CD95/CD95L system in this crosstalk has not been well studied. In this study, we show that gemcitabine stimulates the expression of pro-inflammatory cytokines, such as IL6 and IL8, under the influence of the CD95/CD95L system and the pharmacological inhibitor, sCD95Fc, substantially reduced the expression in two PDAC cell lines, PancTuI-luc and A818-4. The stem cell phenotype was reduced when induced upon gemcitabine as well by sCD95Fc. Moreover, TNF-α as well as TRAIL up-regulate the expression of CD95 and CD95L in both cell lines. Conversely, we detected a significant inhibitory effect of sCD95Fc on the expression of both IL8 and IL6 induced upon TNF-α and ...

Sustainability, 2021

Being one of the fastest-growing economies in the world, Bangladesh needs to upgrade its electric... more Being one of the fastest-growing economies in the world, Bangladesh needs to upgrade its electrical network and aim to reduce dependency on fossil fuel-based energy. For the aging and ever-expanding power network, it is necessary to have a smart substation in order to provide reliable, affordable, and sustainable electrical power. As Bangladesh is looking to integrate Distributed Generation (DG) in the power system, it is high time to think about integrating a smart distribution substation into its power network. In this paper, an investigation of the current power generation structure of Bangladesh was conducted and is described. The major focus was given to the upgradation of the existing substation and distribution setup of Bangladesh by providing suitable architectures, technologies, and communication protocols. Detailed studies of Bangladesh’s prospects to incorporate the new technology and renewable energy into its power network are discussed. ETAP was used to simulate the pro...

Water

This work presents poly(terephthalic-co-glycerol-g-fumaric acid) (TGF) as a novel water-soluble p... more This work presents poly(terephthalic-co-glycerol-g-fumaric acid) (TGF) as a novel water-soluble polymeric nano-additive for the modification of a polyethersulfone ultrafiltration membrane. The TGF was harnessed as a pore former, aiming to improve the membrane surface porosity and hydrophilicity. Modified membranes were characterized to observe the influence of varying the TGF content on their hydrophilicity, porosity, morphological structure, and composition, as well as their entire performance. The results disclosed that porosity and hydrophilicity of the modified membrane prepared using 4 wt.% TGF content recorded an enhancement by 24% and 38%, respectively. Herein, the lower contact angle was mainly a reflection of the improved porosity, but not of the hydrophilic nature of water-soluble TGF. Furthermore, upon increasing the TGF content in the polymeric matrix, a more porous structure with longer finger-like micropores was formed. Moreover, a sponge-like layer clearly appeared ne...

Membranes, 2021

In the current work, a Gum, Arabic-modified Graphene (GGA), has been synthesized via a facile gre... more In the current work, a Gum, Arabic-modified Graphene (GGA), has been synthesized via a facile green method and employed for the first time as an additive for enhancement of the PPSU ultrafiltration membrane properties. A series of PPSU membranes containing very low (0–0.25) wt.% GGA were prepared, and their chemical structure and morphology were comprehensively investigated through atomic force microscopy (AFM), Fourier transforms infrared spectroscopy (FTIR), X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM). Besides, thermogravimetric analysis (TGA) was harnessed to measure thermal characteristics, while surface hydrophilicity was determined by the contact angle. The PPSU-GGA membrane performance was assessed through volumetric flux, solute flux, and retention of sodium alginate solution as an organic polysaccharide model. Results demonstrated that GGA structure had been successfully synthesized as confirmed XRD patterns. Besides, all membranes prepa...

Brazilian Journal of Chemical Engineering, 2021

Herein, we described the synthesis process of highly durable and eco-friendly alkaline anion-exch... more Herein, we described the synthesis process of highly durable and eco-friendly alkaline anion-exchange polyvinyl alcohol/chitosan (PVA–CS) membranes through a casting solution technique for fuel cell application. The blended membranes were then cross-linked with formaldehyde and glutaraldehyde, or plasticized by glycerol. PVA–CS (98/2) % blend, (7% CS) cross-linked with 25% formaldehyde and glutaraldehyde, and (4% CS) plasticized with 25% glycerol, were adopted to prepare four different composite membranes. Characterization tools were implemented to probe the morphology and permeation of the synthesized membranes, including SEM and FTIR. The performance of these membranes was assessed through anion exchange membrane fuel cell applications. The properties of anion exchange membranes including their water uptake, alkaline uptake, swelling ratio, ion exchange capacity (IEC), and ionic conductivity were determined. Membranes cross-linked with glutaraldehyde manifested the higher ionic co...

Engineering and Technology Journal

The inhibition behavior of Dimethylethanolamin (DMEA) on corrosion 7613 Aluminum alloy in 0.6 M N... more The inhibition behavior of Dimethylethanolamin (DMEA) on corrosion 7613 Aluminum alloy in 0.6 M NaCl solution have been investigated using weight loss, polarization techniques .Five different concentrations (2*10-3 , 4*10-3 , 6*10-3 , 8*10-3 and 10*10-3) M of (DMEA) were studded at 25 0 C. Also examine of temperature effect (25, 35, 45) 0 C on the inhibitor efficiency .The results indicated that the inhibition occurs by absorption of inhibitor molecules on the metal surface. The inhibition efficiency (I %) was found to increase with increasing inhibitor concentration and decreasing with increasing temperature. For inhibitor concentration close to (8*10-3 M) maximum inhibition efficiency obtained was 92 %. Above this inhibitor concentration value in the solution the inhibitor efficiency decreases. Polarization measurements showed that the DMEA act as a mixed type inhibitor. The corrosion potential (E corr.) values shifted to less negative values by increasing the concentration of DMEA in the solution up to (8*10-3 M). Adsorption of DMEA on the surface of Aluminum is found to obey the Langmuir isotherm

Water Science and Technology

The preparation, modification and application of green polymers such as poly-lactic acid (PLA), c... more The preparation, modification and application of green polymers such as poly-lactic acid (PLA), chitosan (CS), and cellulose acetate (CA) for oily wastewater treatment is summed up in this review. Due to the low environmental pollution, good chemical resistivity, high hydrophobicity, and good capacity for water-oil emulsion separation of the presented polymers, it then highlights the various membrane production methods and their role in producing effective membranes, with a focus on recent advances in improving membrane properties through the addition of various Nano materials. As a result, the hydrophilic/hydrophobic properties that are critical in the oil separation mechanism are highlighted. Finally, it looks at the predictions and challenges in oil/water separation and recovery. These ideas are discussed with a focus on modern production methods and oil separation proficiency.

International Journal of Food Engineering

In current paper, a comprehensive review to contribute the present insight an implementations and... more In current paper, a comprehensive review to contribute the present insight an implementations and the recent improvements through the diverse endeavor made by the researchers utilizing a membrane technique for degumming, deacidifying, dewaxing and discoloration edible vegetable oils with and without solvent availability and also the solvent recovery has been evaluated. Endeavors made with NF, UF, MF and non-porous membranes, have shown the capability of these membranes to predicate vegetable oil treatment. A membrane technique is noticeably simple and potentially provides many usefulness in vegetable oil purification. It appears that oils treatment with membranes, which carried out at low temperatures that provides saving energy, with real cancellation of stages, provides a promising alternate to conventional procedure, towards the accomplishment of eco-friendly and cost-effective operations that are technically sophisticated. Generally, the solvent (hexane-dilution) technique enhan...

Sustainability

Fuel cells have lately received growing attention since they allow the use of non-precious metals... more Fuel cells have lately received growing attention since they allow the use of non-precious metals as catalysts, which reduce the cost per kilowatt of power in fuel cell devices to some extent. Until recent years, the major barrier in the development of fuel cells was the obtainability of highly conductive anion exchange membranes (AEMs). On the other hand, improvements show that newly enhanced anion exchange membranes have already reached high conductivity levels, leading to the suitable presentation of the cell. Currently, an increasing number of studies have described the performance results of fuel cells. Much of the literature reporting cell performance is founded on hydrogen‒anion exchange membrane fuel cells (AEMFCs), though a growing number of studies have also reported utilizing fuels other than hydrogen—such as alcohols, non-alcohol C-based fuels, and N-based fuels. This article reviews the types, performance, utilized membranes, and operational conditions of anion exchange...

In present work, The corrosion behavior of carbon steel in sodium chloride (NaCl) solution with d... more In present work, The corrosion behavior of carbon steel in sodium chloride (NaCl) solution with different concentrations was studied .Effects of mixing speed (0 to 2220) r.p.m and the solution temperature (25, 35, 45, 55, 65) 0 c on cathodic protection current density were studied, that would provide a full cathodic protection for tube metal specimen of carbon steel immersed in 3.5% NaCl solution by sacrificial anode method using magnesium (Mg) as sacrificial anode. The results show that the concentration of sodium chloride in the electrolyte is an important factor in determining corrosion rate, 3.5 % concentration of sodium chloride gives maximum rate of corrosion. In addition, it has been found that the cathodic protection current density showed sharp increasing with mixing speed. The results have showed also that the cathodic protection current density increased with increasing the solution temperature and shifts the protection potential to high negative value.

International Journal of Research, 2020

The (UF) membrane technologies are very efficient for the treatment of industrial wastewater and ... more The (UF) membrane technologies are very efficient for the treatment of industrial wastewater and solution containing heavy and radioactive elements to reduce water consumption and preserving the environment. After leaching process for phosphogypsum by water deionized and obtain on a solution that contains heavy and radioactive elements (Cu, Zn, Pb, Cd, U, Ni, K, and Th ), were subjected to treatment by UF system in the laboratory. The results showed that Polymers blending have an improvement in the morphological structure of the membranes. The addition of PES has improved the characteristics of the membrane such as the mean pore size, narrower pore size distribution and membrane hydrophilicity. The results showed that, the porosity was (61.31%) for (PPSU 20%-PES 3%) and it was increased to (72.3%) when the concentration was increased to (PPSU 20%-PES 4%) and then decreasing to (51.12%) at the concentration (PPSU 20%-PES 5%). The least value of the porosity was for the membrane pre...

2ND INTERNATIONAL CONFERENCE ON MATERIALS ENGINEERING & SCIENCE (IConMEAS 2019), 2020

Http Dx Doi Org 10 1080 13602008608715970, Mar 20, 2007

Water

This work presents poly(terephthalic-co-glycerol-g-fumaric acid) (TGF) as a novel water-soluble p... more This work presents poly(terephthalic-co-glycerol-g-fumaric acid) (TGF) as a novel water-soluble polymeric nano-additive for the modification of a polyethersulfone ultrafiltration membrane. The TGF was harnessed as a pore former, aiming to improve the membrane surface porosity and hydrophilicity. Modified membranes were characterized to observe the influence of varying the TGF content on their hydrophilicity, porosity, morphological structure, and composition, as well as their entire performance. The results disclosed that porosity and hydrophilicity of the modified membrane prepared using 4 wt.% TGF content recorded an enhancement by 24% and 38%, respectively. Herein, the lower contact angle was mainly a reflection of the improved porosity, but not of the hydrophilic nature of water-soluble TGF. Furthermore, upon increasing the TGF content in the polymeric matrix, a more porous structure with longer finger-like micropores was formed. Moreover, a sponge-like layer clearly appeared ne...

Brazilian Journal of Chemical Engineering, 2021

Herein, we described the synthesis process of highly durable and eco-friendly alkaline anion-exch... more Herein, we described the synthesis process of highly durable and eco-friendly alkaline anion-exchange polyvinyl alcohol/chitosan (PVA–CS) membranes through a casting solution technique for fuel cell application. The blended membranes were then cross-linked with formaldehyde and glutaraldehyde, or plasticized by glycerol. PVA–CS (98/2) % blend, (7% CS) cross-linked with 25% formaldehyde and glutaraldehyde, and (4% CS) plasticized with 25% glycerol, were adopted to prepare four different composite membranes. Characterization tools were implemented to probe the morphology and permeation of the synthesized membranes, including SEM and FTIR. The performance of these membranes was assessed through anion exchange membrane fuel cell applications. The properties of anion exchange membranes including their water uptake, alkaline uptake, swelling ratio, ion exchange capacity (IEC), and ionic conductivity were determined. Membranes cross-linked with glutaraldehyde manifested the higher ionic co...

Chemical Engineering Research and Design, 2022

Phase inversion technique has been utilized to prepare Poly (vinylidene fluoride-co-hexafluoropro... more Phase inversion technique has been utilized to prepare Poly (vinylidene fluoride-co-hexafluoropropylene) PVDF-co-HFP, hollow fiber membranes. Polyvinylpyrrolidone (PVP) with 9 wt. %. added as a pore former additives to the polymer dope solution. Characteristics of the PVDF-co-HFP hollow fiber membrane with / without PVP particles have been studied. It was found that the membrane prepared without PVP additives has a low porosity and a high contact angle. Existence the PVP additives of 9 wt. % causing the increase of the membrane porosity by 28 %.Whilst increase PVP content resulting in decrease of membrane hydrophobicity. MD experiment was done using a direct contact membrane distillation (DCMD) configuration as crucial test to investigate performance of product PVDF-co-HFP hollow fiber membrane. Increase the amount of PVP to 9 wt. % in dope solution, this in turn leads to an increased the permeate flux from of 4.5 to 15.8 Kg/m2.h at 70 oC The effect of operating conditions such as f...

A Poly (vinylidene fluoride-co-hexafluoropropylene), (PVDF-co-HFP) hollow fiber membrane was prep... more A Poly (vinylidene fluoride-co-hexafluoropropylene), (PVDF-co-HFP) hollow fiber membrane was prepared by phase inversion method using different concentrations of PVP as a pore former additives in the dope solution. Surface modification was done using a formic acid through immersion technique. It was observed that the contact angle for all membranes increased due to the surfaces modification (10% of hydrophobicity increment).This study shows that the hydrophobicity of (PVDF-co-HFP) hollow fiber membrane can be enhanced via formic acid surface modification process.

Phase inversion technique has been utilized to prepare Poly (vinylidene fluoride-co-hexafluoropro... more Phase inversion technique has been utilized to prepare Poly (vinylidene fluoride-co-hexafluoropropylene) PVDF- co-HFP, hollow fiber membranes. Polyvinylpyrrolidone (PVP) with 9 wt. %. added as a pore former additives to the polymer dope solution. Characteristics of the PVDF-co-HFP hollow fiber membrane with / without PVP particles have been studied. It was found that the membrane prepared without PVP additives has a low porosity and a high contact angle. Existence the PVP additives of 9 wt. % causing the increase of the membrane porosity by 28 %.Whilst increase PVP content resulting in decrease of membrane hydrophobicity. MD experiment was done using a direct contact membrane distillation (DCMD) configuration as crucial test to investigate performance of product PVDF-co-HFP hollow fiber membrane. Increase the amount of PVP to 9 wt. % in dope solution, this in turn leads to an increased the permeate flux from of 4.5 to 15.8 Kg/m2.h at 70 oC The effect of operating conditions such as ...

Engineering and Technology Journal, 2021

Cancers, 2021

Despite the potential apoptotic functions, the CD95/CD95L system can stimulate survival as well a... more Despite the potential apoptotic functions, the CD95/CD95L system can stimulate survival as well as pro-inflammatory signaling, particularly through the activation of NFκB. This holds true for the TNF/TNFR and the TRAIL/TRAILR systems. Thus, signaling pathways of these three death ligands converge, yet the specific impact of the CD95/CD95L system in this crosstalk has not been well studied. In this study, we show that gemcitabine stimulates the expression of pro-inflammatory cytokines, such as IL6 and IL8, under the influence of the CD95/CD95L system and the pharmacological inhibitor, sCD95Fc, substantially reduced the expression in two PDAC cell lines, PancTuI-luc and A818-4. The stem cell phenotype was reduced when induced upon gemcitabine as well by sCD95Fc. Moreover, TNF-α as well as TRAIL up-regulate the expression of CD95 and CD95L in both cell lines. Conversely, we detected a significant inhibitory effect of sCD95Fc on the expression of both IL8 and IL6 induced upon TNF-α and ...

Sustainability, 2021

Being one of the fastest-growing economies in the world, Bangladesh needs to upgrade its electric... more Being one of the fastest-growing economies in the world, Bangladesh needs to upgrade its electrical network and aim to reduce dependency on fossil fuel-based energy. For the aging and ever-expanding power network, it is necessary to have a smart substation in order to provide reliable, affordable, and sustainable electrical power. As Bangladesh is looking to integrate Distributed Generation (DG) in the power system, it is high time to think about integrating a smart distribution substation into its power network. In this paper, an investigation of the current power generation structure of Bangladesh was conducted and is described. The major focus was given to the upgradation of the existing substation and distribution setup of Bangladesh by providing suitable architectures, technologies, and communication protocols. Detailed studies of Bangladesh’s prospects to incorporate the new technology and renewable energy into its power network are discussed. ETAP was used to simulate the pro...

Water

This work presents poly(terephthalic-co-glycerol-g-fumaric acid) (TGF) as a novel water-soluble p... more This work presents poly(terephthalic-co-glycerol-g-fumaric acid) (TGF) as a novel water-soluble polymeric nano-additive for the modification of a polyethersulfone ultrafiltration membrane. The TGF was harnessed as a pore former, aiming to improve the membrane surface porosity and hydrophilicity. Modified membranes were characterized to observe the influence of varying the TGF content on their hydrophilicity, porosity, morphological structure, and composition, as well as their entire performance. The results disclosed that porosity and hydrophilicity of the modified membrane prepared using 4 wt.% TGF content recorded an enhancement by 24% and 38%, respectively. Herein, the lower contact angle was mainly a reflection of the improved porosity, but not of the hydrophilic nature of water-soluble TGF. Furthermore, upon increasing the TGF content in the polymeric matrix, a more porous structure with longer finger-like micropores was formed. Moreover, a sponge-like layer clearly appeared ne...

Membranes, 2021

In the current work, a Gum, Arabic-modified Graphene (GGA), has been synthesized via a facile gre... more In the current work, a Gum, Arabic-modified Graphene (GGA), has been synthesized via a facile green method and employed for the first time as an additive for enhancement of the PPSU ultrafiltration membrane properties. A series of PPSU membranes containing very low (0–0.25) wt.% GGA were prepared, and their chemical structure and morphology were comprehensively investigated through atomic force microscopy (AFM), Fourier transforms infrared spectroscopy (FTIR), X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM). Besides, thermogravimetric analysis (TGA) was harnessed to measure thermal characteristics, while surface hydrophilicity was determined by the contact angle. The PPSU-GGA membrane performance was assessed through volumetric flux, solute flux, and retention of sodium alginate solution as an organic polysaccharide model. Results demonstrated that GGA structure had been successfully synthesized as confirmed XRD patterns. Besides, all membranes prepa...

Brazilian Journal of Chemical Engineering, 2021

Herein, we described the synthesis process of highly durable and eco-friendly alkaline anion-exch... more Herein, we described the synthesis process of highly durable and eco-friendly alkaline anion-exchange polyvinyl alcohol/chitosan (PVA–CS) membranes through a casting solution technique for fuel cell application. The blended membranes were then cross-linked with formaldehyde and glutaraldehyde, or plasticized by glycerol. PVA–CS (98/2) % blend, (7% CS) cross-linked with 25% formaldehyde and glutaraldehyde, and (4% CS) plasticized with 25% glycerol, were adopted to prepare four different composite membranes. Characterization tools were implemented to probe the morphology and permeation of the synthesized membranes, including SEM and FTIR. The performance of these membranes was assessed through anion exchange membrane fuel cell applications. The properties of anion exchange membranes including their water uptake, alkaline uptake, swelling ratio, ion exchange capacity (IEC), and ionic conductivity were determined. Membranes cross-linked with glutaraldehyde manifested the higher ionic co...