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Article ; Online: Development of layer-by-layer assembled polyamide-imide membranes for oil sands produced water treatment

Nusrat Helali / Laleh Shamaei / Masoud Rastgar / Mohtada Sadrzadeh

Scientific Reports, Vol 11, Iss 1, Pp 1-

2021 Volume 12

Abstract: Abstract The sustainable expansion of steam-assisted gravity drainage, as one of the most popular enhanced oil recovery methods, strongly depends on the proper management of the produced water. The strict environmental regulations have forced the oil ... ...

Abstract	Abstract The sustainable expansion of steam-assisted gravity drainage, as one of the most popular enhanced oil recovery methods, strongly depends on the proper management of the produced water. The strict environmental regulations have forced the oil sands industry to treat and reuse the produced water for oil extraction. Membrane separation as a single-step water treatment technique has played an important role in removing multiple-sized contaminants from wastewater. However, fouling limits the widespread application of this technology if the membrane is not modified properly to achieve antifouling propensities. Herein, we used the layer-by-layer assembly technique to sequentially coat the hydrophilic poly(diallyl dimethylammonium chloride) and polyacrylic acid on the surface of the polyamide-imide porous membrane to improve its fouling resistance. The effect of the number of bilayers on fouling and permeation properties was examined. The membrane with the highest fouling resistance and reasonable hydrodynamic permeability of 5.2 LMH/psi was achieved by coating four bilayers. This membrane exhibited a low flux decline of 50.2% and a high flux recovery ratio of 100%, while these numbers for the pristine PAI membrane were 75.9% and 97.8% under similar test conditions. The enhanced antifouling characteristics of the modified membranes indicate the viability of these membranes for oil sands produced water treatment with an easy cleaning procedure. The key parameter that contributed to the enhanced fouling resistance of the bilayer-coated membranes was the improved surface hydrophilicity, which manifests through the reduction of water contact angle from 62° ± 3° for the pristine membrane to 52° ± 2° for surface-modified membranes.
Keywords	Medicine ; R ; Science ; Q
Subject code	660
Language	English
Publishing date	2021-04-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Analysis of streaming potential flow and electroviscous effect in a shear-driven charged slit microchannel

Adham Riad / Behnam Khorshidi / Mohtada Sadrzadeh

Scientific Reports, Vol 10, Iss 1, Pp 1-

2020 Volume 14

Abstract: Abstract Investigating the flow behavior in microfluidic systems has become of interest due to the need for precise control of the mass and momentum transport in microfluidic devices. In multilayered-flows, precise control of the flow behavior requires a ...

Abstract	Abstract Investigating the flow behavior in microfluidic systems has become of interest due to the need for precise control of the mass and momentum transport in microfluidic devices. In multilayered-flows, precise control of the flow behavior requires a more thorough understanding as it depends on multiple parameters. The following paper proposes a microfluidic system consisting of an aqueous solution between a moving plate and a stationary wall, where the moving plate mimics a charged oil–water interface. Analytical expressions are derived by solving the nonlinear Poisson–Boltzmann equation along with the simplified Navier–Stokes equation to describe the electrokinetic effects on the shear-driven flow of the aqueous electrolyte solution. The Debye–Huckel approximation is not employed in the derivation extending its compatibility to high interfacial zeta potential. Additionally, a numerical model is developed to predict the streaming potential flow created due to the shear-driven motion of the charged upper wall along with its associated electric double layer effect. The model utilizes the extended Nernst–Planck equations instead of the linearized Poisson–Boltzmann equation to accurately predict the axial variation in ion concentration along the microchannel. Results show that the interfacial zeta potential of the moving interface greatly impacts the velocity profile of the flow and can reverse its overall direction. The numerical results are validated by the analytical expressions, where both models predicted that flow could reverse its overall direction when the interfacial zeta potential of the oil–water is above a certain threshold value. Finally, this paper describes the electroviscous effect as well as the transient development of electrokinetic effects within the microchannel.
Keywords	Medicine ; R ; Science ; Q
Subject code	532
Language	English
Publishing date	2020-10-01T00:00:00Z
Publisher	Nature Publishing Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Investigating fouling at the pore-scale using a microfluidic membrane mimic filtration system

Nandini Debnath / Aloke Kumar / Thomas Thundat / Mohtada Sadrzadeh

Scientific Reports, Vol 9, Iss 1, Pp 1-

2019 Volume 10

Abstract: Abstract The work investigates fouling in a microfluidic membrane mimic (MMM) filtration system for foulants such as polystyrene particles and large polymeric molecules. Our MMM device consists of a staggered arrangement of pillars which enables real- ... ...

Abstract	Abstract The work investigates fouling in a microfluidic membrane mimic (MMM) filtration system for foulants such as polystyrene particles and large polymeric molecules. Our MMM device consists of a staggered arrangement of pillars which enables real-time visualization and analysis of pore-scale phenomena. Different fouling scenarios are investigated by conducting constant-pressure experiments. Fouling experiments are performed with three different types of foulants: polystyrene particle solution (colloidal fouling), polyacrylamide polymer solution (organic fouling) and a mixture of these two solutions (combined fouling). Four major categories of microscopic fouling are observed: cake filtration (upstream), pore blocking (inside the pores), colloidal aggregation (downstream) and colloidal streamer fouling (downstream). Our microfluidic experiments show that downstream colloidal aggregation and streamer fouling have a significant effect on overall membrane fouling which were not studied before.
Keywords	Medicine ; R ; Science ; Q
Subject code	660
Language	English
Publishing date	2019-07-01T00:00:00Z
Publisher	Nature Publishing Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Green Electrospun Membranes Based on Chitosan/Amino-Functionalized Nanoclay Composite Fibers for Cationic Dye Removal

Seyed Abolhassan Hosseini / Shervin Daneshvar e Asl / Manouchehr Vossoughi / Abdolreza Simchi / Mohtada Sadrzadeh

ACS Omega, Vol 6, Iss 16, Pp 10816-

Synthesis and Kinetic Studies

2021 Volume 10827

Keywords	Chemistry ; QD1-999
Language	English
Publishing date	2021-04-01T00:00:00Z
Publisher	American Chemical Society
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Comprehensive Characterization of Commercial Reverse Osmosis Membranes through High-Temperature Cross-Flow Filtration

Pooria Karami / Sadegh Aghapour Aktij / Kazem Moradi / Masoud Rastgar / Behnam Khorshidi / Farshad Mohammadtabar / John Peichel / Michael McGregor / Ahmad Rahimpour / Joao B. P. Soares / Mohtada Sadrzadeh

ACS Omega, Vol 9, Iss 1, Pp 1990-

2023 Volume 1999

Keywords	Chemistry ; QD1-999
Language	English
Publishing date	2023-12-01T00:00:00Z
Publisher	American Chemical Society
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Robust fabrication of thin film polyamide-TiO2 nanocomposite membranes with enhanced thermal stability and anti-biofouling propensity

Behnam Khorshidi / Ishita Biswas / Tanushree Ghosh / Thomas Thundat / Mohtada Sadrzadeh

Scientific Reports, Vol 8, Iss 1, Pp 1-

2018 Volume 10

Abstract: Abstract The development of nano-enabled composite materials has led to a paradigm shift in the manufacture of high-performance nanocomposite membranes with enhanced permeation, thermo-mechanical, and antibacterial properties. The major challenges to the ...

Abstract	Abstract The development of nano-enabled composite materials has led to a paradigm shift in the manufacture of high-performance nanocomposite membranes with enhanced permeation, thermo-mechanical, and antibacterial properties. The major challenges to the successful incorporation of nanoparticles (NPs) to polymer films are the severe aggregation of the NPs and the weak compatibility of NPs with polymers. These two phenomena lead to the formation of non-selective voids at the interface of the polymer and NPs, which adversely affect the separation performance of the membrane. To overcome these challenges, we have developed a new method for the fabrication of robust TFN reverse osmosis membranes. This approach relies on the simultaneous synthesis and surface functionalization of TiO2 NPs in an organic solvent (heptane) via biphasic solvothermal reaction. The resulting stable suspension of the TiO2 NPs in heptane was then utilized in the interfacial (in-situ) polymerization reaction where the NPs were entrapped within the matrix of the polyamide (PA) membrane. TiO2 NPs of 10 nm were effectively incorporated into the thin PA layer and improved the thermal stability and anti-biofouling properties of the resulting TFN membranes. These features make our synthesized membranes potential candidates for applications where the treatment of high-temperature streams containing biomaterials is desirable.
Keywords	Medicine ; R ; Science ; Q
Subject code	620
Language	English
Publishing date	2018-01-01T00:00:00Z
Publisher	Nature Publishing Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Robust Polymer Nanocomposite Membranes Incorporating Discrete TiO 2 Nanotubes for Water Treatment

Najia Mahdi / Pawan Kumar / Ankur Goswami / Basil Perdicakis / Karthik Shankar / Mohtada Sadrzadeh

Nanomaterials, Vol 9, Iss 9, p

2019 Volume 1186

Abstract: Polyethersulfone (PES) is a polymeric permeable material used in ultrafiltration (UF) membranes due to its high thermomechanical and chemical stability. The hydrophobic nature of PES membranes renders them prone to fouling and restricts the practical ... ...

Abstract	Polyethersulfone (PES) is a polymeric permeable material used in ultrafiltration (UF) membranes due to its high thermomechanical and chemical stability. The hydrophobic nature of PES membranes renders them prone to fouling and restricts the practical applications of PES in the fabrication of water treatment membranes. The present study demonstrates a non-solvent-induced phase separation (NIPS) approach to modifying PES membranes with different concentrations of discrete TiO 2 nanotubes (TNTs). Zeta potential and contact angle measurements showed enhanced hydrophilicity and surface negative charge in TNTs/PES nanocomposite membranes compared to unmodified PES membranes. To discern the antifouling and permeation properties of the TNTs/PES membranes, steam assisted gravity drainage (SAGD) wastewater obtained from the Athabasca oil sands of Alberta was used. The TiO 2 modified polymer nanocomposite membranes resulted in a higher organic matter rejection and water flux than the unmodified PES membrane. The addition of discrete TNTs at 1 wt% afforded maximum water flux (82 L/m 2 h at 40 psi), organic matter rejection (53.9%), and antifouling properties (29% improvement in comparison to pristine PES membrane). An enhancement in fouling resistance of TNTs/PES nanocomposite membranes was observed in flux recovery ratio experiments.
Keywords	superhydrophilic nanotubes ; electrochemical anodization ; blend membranes ; asymmetric polysulfone ; Chemistry ; QD1-999
Language	English
Publishing date	2019-08-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Enhanced Electrically Induced Micropatterning of Confined Thin Liquid Films: Thermocapillary Role and Its Limitations

Nazaripoor, Hadi / Charles R. Koch / Mohtada Sadrzadeh

Industrial & engineering chemistry process design and development. 2017 Sept. 27, v. 56, no. 38

2017

Abstract: Electrohydrodynamic (EHD) and thermocapillary (TC) forces are used to destabilize the interface of ultrathin liquid films and create sub-micrometer-sized features. EHD instabilities result from the normal component of Maxwell stress, while TC forces ... ...

Abstract	Electrohydrodynamic (EHD) and thermocapillary (TC) forces are used to destabilize the interface of ultrathin liquid films and create sub-micrometer-sized features. EHD instabilities result from the normal component of Maxwell stress, while TC forces induce shear stress to the interface. In this study, the accuracy of linear stability (LS) analysis for the prediction of final structures which undergo nonlinear stages during pattern evolution is investigated by using new normalizing factors. The reasons for the deviation between LS analysis and nonlinear simulation results are then discussed. It is found that, despite the positive effect of TC in reducing the structure sizes compared to the EHD case, it causes lateral movement of pillars, which results in faster coarsening in later stages of pattern formation. To control the movement of patterns and create well-ordered features, nonuniform electrostatic and TC-induced instabilities of the film are examined by using ridge and square-block-shaped electrodes.
Keywords	electrodes ; liquids ; prediction ; process design ; shear stress
Language	English
Dates of publication	2017-0927
Size	p. 10678-10688.
Publishing place	American Chemical Society
Document type	Article
ZDB-ID	1484436-9
ISSN	1520-5045 ; 0888-5885
ISSN (online)	1520-5045
ISSN	0888-5885
DOI	10.1021/acs.iecr.7b02814
Database	NAL-Catalogue (AGRICOLA)

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Article: Synthesis of thin film composite polyamide membranes: Effect of monohydric and polyhydric alcohol additives in aqueous solution

Khorshidi, Behnam / Babak Soltannia / Mohtada Sadrzadeh / Thomas Thundat

Journal of membrane science. 2017 Feb. 01, v. 523

2017

Abstract: Thin film composite (TFC) polyamide (PA) membranes are the most widely used membranes in current water filtration processes. Over the past decade, extensive efforts have been made to improve the permeation properties of the TFC PA membranes via different ...

Abstract	Thin film composite (TFC) polyamide (PA) membranes are the most widely used membranes in current water filtration processes. Over the past decade, extensive efforts have been made to improve the permeation properties of the TFC PA membranes via different techniques. In the present work, the effect of incorporating monohydric and polyhydric alcohols into the aqueous solution on surface morphology and permeation properties of resulting TFC PA membranes was studied. The TFC PA membranes were prepared by interfacial polymerization (IP) reaction between m-phenylenediamine (MPD)-aqueous and trimesoyl chloride (TMC)-hexane solutions over polyethersulfone (PES) support. Different concentrations of ethanol (C2H6O), ethylene glycol (C2H6O2), and xylitol (C5H12O5) were added into the MPD-aqueous solution. The results showed that addition of alcohols with low molar volumes such as ethanol and ethylene glycol significantly improved water flux of the synthesized membranes. However, in the case of alcohols with larger molar volumes, like polyhydric xylitol, the water flux enhanced by increasing the alcohol concentration up to ~1.0wt%, and then decreased, suggesting the presence of an optimum concentration of xylitol. This observation indicated the presence of a complex interaction between the hydrophilic hydroxyl groups and hydrophobic aliphatic carbon chain in the structure of large alcohol molecules. Furthermore, all the modified membranes showed higher rejection percentage than the original membrane which is highly desirable for fabrication of high-performance TFC membranes. The findings of this study provide insight into the synergistic effects of structural properties and surface characteristics, which are altered by the addition of alcohols, on the permeation properties of the TFC membranes.
Keywords	additives ; aqueous solutions ; artificial membranes ; carbon ; ethanol ; ethylene glycol ; filtration ; hydrophilicity ; hydrophobicity ; polyamides ; polymerization ; synergism ; xylitol
Language	English
Dates of publication	2017-0201
Size	p. 336-345.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	194516-6
ISSN	0376-7388
ISSN	0376-7388
DOI	10.1016/j.memsci.2016.09.062
Database	NAL-Catalogue (AGRICOLA)

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Article: A parametric study on the synergistic impacts of chemical additives on permeation properties of thin film composite polyamide membrane

Khorshidi, Behnam / David Pernitsky / Mohtada Sadrzadeh / Thomas Thundat

Journal of membrane science. 2017 Aug. 01, v. 535

2017

Abstract: Thin film composite (TFC) polyamide (PA) membranes are typically prepared via an interfacial polymerization (IP) reaction between polyfunctional amine and polyacyl chloride monomers, dissolved separately in aqueous and organic solutions, at the surface ... ...

Abstract	Thin film composite (TFC) polyamide (PA) membranes are typically prepared via an interfacial polymerization (IP) reaction between polyfunctional amine and polyacyl chloride monomers, dissolved separately in aqueous and organic solutions, at the surface of a porous support. Since the invention of the TFC membranes, various types of chemical additives were utilized in the monomer-containing solutions to control the IP reaction and thus improve the permeation properties of the synthesized membranes. However, the synergistic effects of utilizing different additives and the optimization of their concentration levels for synthesizing high-performance membranes with the minimum sensitivity to the effect of uncontrollable factors (noise) have not been explored so far. In the present work, different concentrations of sodium dodecyl sulfate (SDS) as a surfactant, triethylamine (TEA) as an acid scavenger, dimethyl sulfoxide (DMSO) as a co-solvent, and camphorsulfonic acid (CSA) as a pH regulator were added into the amine solution. An L9 orthogonal array of Taguchi method was used to investigate the simultaneous effect of these additives at three levels. The results showed that increasing the concentration of CSA, DMSO and TEA improved water permeation of the membranes whereas higher concentrations of SDS led to the formation of less permeable membranes with higher salt rejection. The same level setting of additives was also found to make the fabrication process insensitive to the noise factors. Furthermore, based on the analysis of variance, the contribution of the additives to the variation of the water flux was in the order of SDS (40.8%) > DMSO (37%) > CSA (17.78%) > TEA (4.1%). The results of this study are expected to provide useful guidelines for the development of robust TFC membranes by adjusting the additive concentration in amine aqueous solution.
Keywords	additives ; analysis of variance ; aqueous solutions ; chlorides ; dimethyl sulfoxide ; guidelines ; pH ; polyamides ; polymerization ; sodium dodecyl sulfate ; surfactants ; synergism ; Taguchi method ; thin film composite membranes ; triethylamine
Language	English
Dates of publication	2017-0801
Size	p. 248-257.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	194516-6
ISSN	0376-7388
ISSN	0376-7388
DOI	10.1016/j.memsci.2017.04.052
Database	NAL-Catalogue (AGRICOLA)

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