Properties of Polysulfone/Halloysite Nanocomposite Membranes: Prepared by Phase Inversion Method

Swapna, Valiya Parambath; Saranya, E P; Nithya, A.; Thomas, Sabu; Stephen, Ranimol

doi:10.1002/masy.201500003

Cited by 8 publications

(6 citation statements)

References 33 publications

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“…The toxicity nature of HNT can be evaluated by conducting cell culture studies. 25 The uptake and release rate of drugs also can be studied similarly. This paves way for the PLA-HNT bionanocomposites to be used in different applications.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Evaluation of intercalation and interaction in in-situ polymerized PLA-HNT bionanocomposites

Manju

Krishnan

Nayak

2020

Polymers and Polymer Composites

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We report the in-situ synthesis of poly(lactic acid)–halloysite nanotubes (PLA-HNT) bionanocomposites, with a perspective to improve the interaction between PLA and HNT. Three PLA-HNT bionanocomposites with different HNT weight percentages were synthesized by polycondensation, followed by azeotropic distillation technique. Fourier transform infrared spectroscopy studies indicated the existence of hydrogen bonding between terminal hydroxyl groups of PLA and Si–O–Si groups present in the outer surface of HNT. Wide-angle X-ray diffraction, 29Si- and 27Al-nuclear magnetic resonance spectroscopy analysis confirmed the intercalation of PLA into HNT. Scanning electron microscopy analysis confirmed that there was no significant agglomeration and PLA matrix was found to be embedded with HNT. Transmission electron microscopy analysis also gave ample proof to substantiate the intercalation of PLA chains into HNT. Studies on zeta potential of PLA-HNT bionanocomposites, as compared with PLA, also confirmed the interactions between PLA and HNT. Single melting peak in differential scanning calorimetry analysis indicated the existence of one form of crystalline structure.

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Section: Introductionmentioning

confidence: 99%

RETRACTED: Evaluation of intercalation and interaction in in-situ polymerized PLA-HNT bionanocomposites

Manju

Krishnan

Nayak

2020

Polymers and Polymer Composites

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“…The band at 1650 cm −1 represents the deformation vibrations of the adsorbed water. The band at 1004 cm −1 can be attributed to the stretching vibrations of Si–O, at 524 cm −1 to the deformation vibrations of Al–O–Si and at 458 cm −1 to the bending vibrations of Si–O–Si [21,41].…”

Section: Resultsmentioning

confidence: 99%

“…The number of literature reports on application of neat halloysite nanotubes for membranes preparation is low. The unmodified HNTs were applied for preparation of polymeric membranes made of PES [10], polyamide (PA) [19,20], polysulfone (PSU) [21], polystyrene (PS) [22], chitosan [23], polyacrylonitrile (PAN) [24] and poly(vinyl chloride) (PVC) [25]. These membranes were applied in MF [22], UF [10,22,25] and reverse osmosis (RO) [19,20] processes.…”

Section: Introductionmentioning

confidence: 99%

“…That was attributed to the more negative surface charge of the membranes upon addition of HNTs [19,20]. To improve the dispersion of HNTs in polysulfone membranes, application of polyetheramine was proposed [21]. An increase of the hydrophilicity of the membranes was observed and, additionally, an enhancement of water uptake in case of membranes containing higher concentration (7–10 wt %) of HNTs was reported.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, a decrease of porosity of the membranes with filler loading up to 5 wt % was found, whereas a higher loading of the nanomaterial led to the porosity increase. However, the authors did not present any data on permeability or separation properties of the membranes [21]. Halloysite nanotubes were also proposed as a modifying agent of polystyrene membranes [22].…”

Section: Introductionmentioning

confidence: 99%

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Investigations on the Properties and Performance of Mixed-Matrix Polyethersulfone Membranes Modified with Halloysite Nanotubes

et al. 2019

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Ultrafiltration (UF) polyethersulfone (PES) membranes were prepared by wet phase inversion method. Commercial halloysite nanotubes (HNTs) in the amount of 0.5–4 wt % vs PES (15 wt %) were introduced into the casting solution containing the polymer and N,N-dimethylformamide as a solvent. The morphology, physicochemical properties and performance of the membranes were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM), zeta potential, porosity and contact angle analyses, as well as permeability measurements. Moreover, the antifouling properties of the membranes were evaluated during UF of a model solution of bovine serum albumin (BSA). The research revealed a positive influence of modification with HNTs on hydrophilicity, water permeability and antifouling properties of the PES membranes. The most significant improvement of permeability was obtained in case of the membrane containing 2 wt % of HNTs, whereas the highest fouling resistance was observed for 0.5 wt % HNTs content. It was found that a good dispersion of HNTs can be obtained only at loadings below 2 wt %. Based on the results a relation between severity of membrane fouling and surface roughness was proved. Moreover, an increase of the roughness of the modified membranes was found to be accompanied by an increase of isoelectric point values.

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Fabrication of green poly (L‐lactic acid) hybrid membrane through incorporation of functionalized natural halloysite nanotubes

Wang

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND Membrane technology has attracted increasing interest in the field of separation and purification. Unfortunately, conventional membrane materials are usually derived from non‐renewable fossil resources that are difficult to degrade at the end of their life. In this work, as a sustainable alternative to the conventional polymer membrane, the biobased ploy (L‐lactic acid) (PLLA) hybrid membrane was successfully fabricated through the incorporation of modified natural halloysite nanotubes (HNTs). RESULTS The PLLA/HNT hybrid membranes were analysed by attenuated total reflectance‐Fourier transform infrared spectroscopy (ATR‐FTIR), X‐ray diffraction (XRD), scanning electron microscopy (SEM), X‐ray diffraction (XRD), and contact angle measurement. The pure water flux of the hybrid membrane increased from 140.3 to 329.7 L.m−3.h−1, while the bovine serum albumin (BSA) rejection ratio decreased from 94.3 to 82.7% with increasing HNT loading content from 0 to 1 wt%. Moreover, the addition of HNTs could also enhance the antifouling performance of the hybrid membrane. CONCLUSION The green PLLA/HNT hybrid membrane was successfully made from the recoverable and biodegradable PLLA and naturally occurring HNTs. Compared with the PLLA‐based membranes reported in the literature, the PLLA/HNT hybrid membranes presented relatively high permeability, moderate BSA rejection, and good antifouling performance. The green poly (L‐lactic acid) hybrid membranes hold great promise for practical application as they can contribute to a circular economy and sustainable development. © 2022 Society of Chemical Industry (SCI).

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Properties of Polysulfone/Halloysite Nanocomposite Membranes: Prepared by Phase Inversion Method

Cited by 8 publications

References 33 publications

RETRACTED: Evaluation of intercalation and interaction in in-situ polymerized PLA-HNT bionanocomposites

RETRACTED: Evaluation of intercalation and interaction in in-situ polymerized PLA-HNT bionanocomposites

Investigations on the Properties and Performance of Mixed-Matrix Polyethersulfone Membranes Modified with Halloysite Nanotubes

Fabrication of green poly (L‐lactic acid) hybrid membrane through incorporation of functionalized natural halloysite nanotubes

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