The role of support layer properties on the fabrication and performance of thin-film composite membranes: The significance of selective layer-support layer connectivity

Mokarizadeh, Hadi; Moayedfard, Sareh; Maleh, Mohammad Salehi; Mohamed, Syed Ibrahim Gnani Peer; Nejati, Siamak; Esfahani, Milad Rabbani

doi:10.1016/j.seppur.2021.119451

Cited by 34 publications

(12 citation statements)

References 157 publications

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“…When MXene nanosheets are added to the aqueous phase, in Figure e, due to their hydrophilic nature, they promoted the PIP transport toward the IP reaction interface, causing more PA to form on the surface rather than inside the pores, which possibly enhances the water permeability due to the alleviated mass transport resistance. However, as seen in Figure e, the higher amount of MXene resulted in agglomeration on the surface of the support layer, acting as dense films blocking the pores with PIP inside them and therefore preventing the formation of PA inside and on the mouth of the pore . EDAX measurement, shown in Figure S4, displays MXene nanosheets in the PA layer, indicating successful functionalization of the outer selective layer.…”

Section: Resultsmentioning

confidence: 94%

“…However, as seen in Figure 4e, the higher amount of MXene resulted in agglomeration on the surface of the support layer, acting as dense films blocking the pores with PIP inside them and therefore preventing the formation of PA inside and on the mouth of the pore. 49 EDAX measurement, shown in Figure S4, displays MXene nanosheets in the PA layer, indicating successful functionalization of the outer selective layer.…”

Section: Resultsmentioning

confidence: 99%

“…The support layer properties such as pore size and porosity and amine diffusion at the aqueous−organic interface determine the morphology and structure of the PA layer. 49 In general, smaller support pore sizes lead to increased PA film heterogeneity due to greater nanobubble (CO 2 ) confinement. The reaction between PIP and TMC in the IP process generates heat and HCl (strong acid) as a byproduct, which results in the reduction of dissolved gasses such as CO 2 and therefore the degassing of CO 2 during the IP process (Figure S1).…”

Section: Resultsmentioning

confidence: 99%

“…At higher concentrations of MXene (0.025–0.050%), dark regions began to form, which could be a sign of agglomeration of MXene nanosheets. The support layer properties such as pore size and porosity and amine diffusion at the aqueous–organic interface determine the morphology and structure of the PA layer . In general, smaller support pore sizes lead to increased PA film heterogeneity due to greater nanobubble (CO 2 ) confinement.…”

Section: Resultsmentioning

confidence: 99%

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Functionalized-MXene Thin-Film Nanocomposite Hollow Fiber Membranes for Enhanced PFAS Removal from Water

Jamshidi

Beidaghi

et al. 2022

ACS Appl. Mater. Interfaces

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Due to adverse health effects and the broad sources of per-and polyfluoroakyl substances (PFAS), PFAS removal is a critical research area in water purification. We demonstrate the functionalization of thin-film composite (TFC) hollow fiber nanofiltration (HFN) membranes by MXene nanosheets during the interfacial polymerization (IP) process for enhanced removal of perfluorooctane sulfonic acid (PFOS) from water. A MXenepolyamide (PA) selective layer was fabricated on top of a polysulfone (PSF) hollow fiber support via IP of trimesoyl chloride (TMC) and a mixture of piperazine (PIP) and MXene nanosheets to form MXene-PA thin-film nanocomposite (TFN) membranes. Incorporating MXene nanosheets during the IP process tuned the morphology and negative surface charge of the selective layer, resulting in enhanced PFOS rejection from 72% (bare TFC) to more than 96% (0.025 wt % MXene TFN), while the water permeability was also increased from 13.19 (bare TFC) to 29.26 LMH/bar (0.025 wt % MXene TFN). Our results demonstrate that both electrostatic interaction and size exclusion are the main factors governing the PFOS rejection, and both are determined by PA selective layer structural and chemical properties. The lamella structure and interlayer of MXene nanosheets inside the PA layer provided different transport mechanisms for water, ions, and PFAS molecules, resulting in enhanced water permeability and PFAS rejection due to traveling through the membrane by both diffusions through the PA layer and the MXene intralayer channels. MXene nanosheets showed very promising capability as a 2D additive for tuning the structural and chemical properties of the PA layer at the permeability-rejection tradeoff.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Functionalized-MXene Thin-Film Nanocomposite Hollow Fiber Membranes for Enhanced PFAS Removal from Water

Jamshidi

Beidaghi

et al. 2022

ACS Appl. Mater. Interfaces

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“…This hinders the formation of the polyamide layer in a TFC membrane as the support should be hydrophilic enough to uptake monomers from the aqueous phase. 32 In addition, the loosened stacked fibers may lead to defects in the final TFC membranes. To tackle this problem, an interlayer is added when using electrospun nanofibers as TFC supports.…”

Section: Introductionmentioning

confidence: 99%

Biobased thin-film composite membranes comprising priamine–genipin selective layer on nanofibrous biodegradable polylactic acid support for oil and solvent-resistant nanofiltration

et al. 2022

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Development of braid reinforced hollow fiber membranes as both ultrafiltration and nanofiltration membranes: Effect of pore forming additive on structure and performance

Tuncay

Keskin

Türken

et al. 2022

J of Applied Polymer Sci

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Hollow fiber membranes have higher surface area and are easy to be applied in systems. Because of theirs self‐supporting construction, they have limited mechanical durability. By reinforcing these membranes with a braid, the mechanical strength can be improved. In this study, the impact of polyvinyl pyrrolidone (PVP) as a pore‐forming additive with different contents on the fabrication of polysulfone braid reinforced hollow fiber membranes was investigated both as a ultrafiltration membrane and as a support for the fabrication of thin film composite (TFC) nanofiltration membranes. Characterization and filtration studies of all membranes were performed to examine membrane performance. It was discovered that the porosity and hydrophilicity of the ultrafiltration membranes were enhanced by enhancing PVP concentration, thus increasing the pure water flux in the membranes. As regards to results of fabricated TFC membranes, salt rejections were increased with increasing PVP ratios. The rejection efficiency of magnesium sulfate and sodium chloride was found to be approximately 80% and 49%, respectively, when a PVP ratio of 8% was used.

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The role of support layer properties on the fabrication and performance of thin-film composite membranes: The significance of selective layer-support layer connectivity

Cited by 34 publications

References 157 publications

Functionalized-MXene Thin-Film Nanocomposite Hollow Fiber Membranes for Enhanced PFAS Removal from Water

Functionalized-MXene Thin-Film Nanocomposite Hollow Fiber Membranes for Enhanced PFAS Removal from Water

Biobased thin-film composite membranes comprising priamine–genipin selective layer on nanofibrous biodegradable polylactic acid support for oil and solvent-resistant nanofiltration

Development of braid reinforced hollow fiber membranes as both ultrafiltration and nanofiltration membranes: Effect of pore forming additive on structure and performance

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