Thermo-responsive adsorption-desorption of perfluoroorganics from water using PNIPAm hydrogels and pore functionalized membranes

Saad, Anthony; Mills, Rollie; Wan, Hongyi; Mottaleb, M. Abdul; Ormsbee, Lindell; Bhattacharyya, Dibakar

doi:10.1016/j.memsci.2020.117821

Cited by 53 publications

(63 citation statements)

References 49 publications

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“…Numerous applications of MMM are possible due to the versatility of modifying PNIPAM particles 2,4,5 . The transfer of thermo‐responsive MMM flat membranes to hollow fiber geometry represents an important step in this context, to make them usable for real applications.…”

Section: Discussionmentioning

confidence: 99%

Thermo‐responsive mixed‐matrix hollow fiber membranes

Götz

Landzettel

Schiestel

2021

J of Applied Polymer Sci

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Up to date, preparation of thermo‐responsive mixed‐matrix membranes (MMM) has only be described as small scale flat membranes or multi‐step processes for hollow fiber membranes. In this work, the development of thermo‐responsive MMM hollow fibers composed of polyethersulfone as membrane polymer and poly(N‐isopropylacrylamide) (PNIPAM) microgel particles via the wet spinning process is presented. PNIPAM particles are synthesized with (NP‐S, zavg 20°C = 105 nm) and without (NP‐L, zavg 20°C = 250 nm) sodium dodecyl sulfate and their thermo‐responsive behavior is characterized by dynamic light scattering. Particle size (NP‐S, NP‐L), particle content (10%, 15%) and the extrusion pressure in the wet spinning process (1.0–3.0 bar) are investigated as experimental parameters. Reversible thermo‐responsive behavior of the hollow fibers is demonstrated by water permeability measurements at different temperatures (20 and 50°C). The largest switching factors (R) are observed for the hollow fibers containing NP‐L. For 15% NP‐L and 1 bar extrusion pressure, water permeances between 0.5 and 6.0 L m−2 h−1 bar−1 are observed, corresponding to R = 12 and a dextran (500 kDa) rejection of 91% at 25°C.

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Section: Discussionmentioning

confidence: 99%

Thermo‐responsive mixed‐matrix hollow fiber membranes

Götz

Landzettel

Schiestel

2021

J of Applied Polymer Sci

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“…The concentration of PFOA was determined using an liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for per-/polyfluoroalkyl substances from water, according to the one used by Saad et al [ 39 , 51 ]. Essentially, we employed our previously developed and reported the LC-MS/MS method for per-/polyfluoroalkyl substance (PFAS) analysis.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, a temperature-responsive membrane composed of poly-N-isopropylacrylamide (PNIPAAm) on polyvinylidene difluoride (PVDF) membranes acted as polymeric adsorber to remove PFOA successfully [ 39 ]; however, PFOA was not destroyed. Therefore, there is a critical need for safe and efficient remediation methods for PFAS, particularly in drinking water.…”

Section: Introductionmentioning

confidence: 99%

Dual-Functional Phosphorene Nanocomposite Membranes for the Treatment of Perfluorinated Water: An Investigation of Perfluorooctanoic Acid Removal via Filtration Combined with Ultraviolet Irradiation or Oxygenation

et al. 2020

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Nanomaterials with tunable properties show promise because of their size-dependent electronic structure and controllable physical properties. The purpose of this research was to develop and validate environmentally safe nanomaterial-based approach for treatment of drinking water including removal and degradation of per- and polyfluorinated chemicals (PFAS). PFAS are surfactant chemicals with broad uses that are now recognized as contaminants with a significant risk to human health. They are commonly used in household and industrial products. They are extremely persistent in the environment because they possess both hydrophobic fluorine-saturated carbon chains and hydrophilic functional groups, along with being oleophobic. Traditional drinking water treatment technologies are usually ineffective for the removal of PFAS from contaminated waters, because they are normally present in exiguous concentrations and have unique properties that make them persistent. Therefore, there is a critical need for safe and efficient remediation methods for PFAS, particularly in drinking water. The proposed novel approach has also a potential application for decreasing PFAS background levels in analytical systems. In this study, nanocomposite membranes composed of sulfonated poly ether ether ketone (SPEEK) and two-dimensional phosphorene were fabricated, and they obtained on average 99% rejection of perfluorooctanoic acid (PFOA) alongside with a 99% removal from the PFOA that accumulated on surface of the membrane. The removal of PFOA accumulated on the membrane surface achieved 99% after the membranes were treated with ultraviolet (UV) photolysis and liquid aerobic oxidation.

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Section: Introductionmentioning

confidence: 99%

“…In addition to all above, poly-(N-isopropylacrylamide) (PNIPAM) is a temperature-sensitive hydrogel that can be classified as a subcategory of smart hydrogels and has been studied by researchers according to different aspects (Saad et al, 2020; Warren et al, 2020). In particular, constitutive modeling of these materials was examined and some models were presented for their coupled thermo-mechanical behavior (Birgersson et al, 2008; Cai and Suo, 2011; Chester and Anand, 2011; Ding et al, 2013, 2016; Drozdov, 2015; Keller et al, 2011; Mazaheri et al, 2016a).…”

Section: Introductionmentioning

confidence: 99%

Fluid-structure interaction simulations for a temperature-sensitive functionally graded hydrogel-based micro-channel

Ghasemkhani

Mazaheri

Amiri

2020

Journal of Intelligent Material Systems and Structures

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The behavior of a temperature-sensitive micro-channel have been investigated in this study which mainly includes a functionally graded (FG) hydrogel as a sensor or an actuator. In order to achieve this goal, both fluid-structure interaction (FSI) and non-FSI simulations are conducted for hydrogel with homogeneous property distribution as well as FG hydrogels with different number of layers (2–16 layers). Moreover, this study investigates the FG hydrogel cross-linking density that obeys a general exponential form. In addition to all mentioned, the FG hydrogels are considered in both ascending and descending states with vertically and horizontally functionally graded property distributions (VFG and HFG hydrogels). Subsequently, the importance of the difference between the FG and homogenous hydrogels has been highlighted in the findings of the study. Besides, the FSI influence has a vital role in these structures especially once an FG material is utilized. According to the findings, the ascending and descending distributions of the hydrogel properties may significantly affect the micro-channel behavior, especially in horizontally graded type. This process can be done in a way that for descending distribution of HFG there exist no closing state for the micro-channel.

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Thermo-responsive adsorption-desorption of perfluoroorganics from water using PNIPAm hydrogels and pore functionalized membranes

Cited by 53 publications

References 49 publications

Thermo‐responsive mixed‐matrix hollow fiber membranes

Thermo‐responsive mixed‐matrix hollow fiber membranes

Dual-Functional Phosphorene Nanocomposite Membranes for the Treatment of Perfluorinated Water: An Investigation of Perfluorooctanoic Acid Removal via Filtration Combined with Ultraviolet Irradiation or Oxygenation

Fluid-structure interaction simulations for a temperature-sensitive functionally graded hydrogel-based micro-channel

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