Enhanced antifouling performance of halloysite nanotubes (HNTs) blended poly(vinyl chloride) (PVC/HNTs) ultrafiltration membranes: For water treatment

Mishra, Gourav; Mukhopadhyay, Mausumi

doi:10.1016/j.jiec.2018.02.037

Cited by 80 publications

(34 citation statements)

References 57 publications

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“…Water contact angle (WCA) at the membrane surface determines the surface hydrophilicity and wettability of a membrane [81], and this is an important parameter for evaluating the membrane's ability for fouling. An adjacent hydration layer is formed at a hydrophilic membrane surface, which behaves as a physical barrier for foulants to be deposited on the membrane's surface [57,82]. Figure 14a shows the WCA values for PSF and PSF/PVP-based membranes at different HNTs loading.…”

Section: Water Contact Anglementioning

confidence: 99%

“…It could be observed in Figure 14a that HNTs addition to the PSF casting solution notably reduced the WCA value from 78.7 • ± 1.7 • to 64.7 • ± 2.5 • when HNTs loading increased from 0 to 5.0 wt %. The decrease in WCA values for HNTs containing membranes is explained by the hydrophilic nature of HNTs additive, which contains a large number of hydroxylic groups [57].…”

Section: Water Contact Anglementioning

confidence: 99%

“…Despite the great contribution of the above-mentioned studies on inclusion of HNTs into polymeric membrane matrixes, previous studies used raw or modified HNTs embedding with other membrane polymers [40,42,43,[47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65] modified HNTs with PSF [46,66], raw HNT with PSF/PVP matrix for the preparation of porous substrate for thin film nanocomposite membranes [45,67] or used other membrane fabrication methods, such as the electrospinning technique [68,69].…”

Section: Introductionmentioning

confidence: 99%

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Polysulfone Membranes Embedded with Halloysites Nanotubes: Preparation and Properties

et al. 2019

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In the present study, nanocomposite ultrafiltration membranes were prepared by incorporating nanotubes clay halloysite (HNTs) into polysulfone (PSF) and PSF/polyvinylpyrrolidone (PVP) dope solutions followed by membrane casting using phase inversion method. Characterization of HNTs were conducted using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and thermogravimetric (TGA) analysis. The pore structure, morphology, hydrophilicity and mechanical properties of the composite membranes were characterized by using SEM, water contact angle (WCA) measurements, and dynamic mechanical analysis. It was shown that the incorporation of HNTs enhanced hydrophilicity and mechanical properties of the prepared PSF membranes. Compared to the pristine PSF membrane, results show that the total porosity and pore size of PSF/HNTs composite membranes increased when HNTs loadings were more than 0.5 wt % and 1.0 wt %, respectively. These findings correlate well with changes in water flux of the prepared membranes. It was observed that HNTs were homogenously dispersed within the PSF membrane matrix at HNTs content of 0.1 to 0.5 wt % and the PSF/HNTs membranes prepared by incorporating 0.2 wt % HNTs loading possess the optimal mechanical properties in terms of elastic modulus and yield stress. In the case of the PSF/PVP matrix, the optimal mechanical properties were obtained with 0.3 wt % of HNTs because PVP enhances the HNTs distribution. Results of bovine serum albumin (BSA) filtration tests indicated that PSF/0.2 wt % HNTs membrane exhibited high BSA rejection and notable anti-fouling properties.

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Section: Water Contact Anglementioning

confidence: 99%

Section: Water Contact Anglementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polysulfone Membranes Embedded with Halloysites Nanotubes: Preparation and Properties

et al. 2019

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“…All the membranes showed similar porosity percentage of around 79%. The mean pore size of the membrane was increased with the addition of HNTs and f-HNTs due to the hydrophilicity of the membranes because the solution with higher hydrophilicity will lead to a faster exchange rate between the solvent and non-solvent (DI water), resulting in large pore size [27]. The PES membrane showed a mean pore size of 6.67 nm, and the mean pore sizes of the membranes with HNTs were 10.85 nm (HNT0.5), 13.25 nm (HNT1.0), and 15.39 nm (HNT2.0).…”

Section: Intrinsic Propertiesmentioning

confidence: 99%

“…This is because the improved mean pore size helps the water permeate through the membranes. In addition, the formation of interfacial gaps between the HNT and the polymer matrix also enhances the water flux because they act as water channels, and increased hydrophilicity also affects the pure water flux owing to the presence of a large amount of hydrophilic functional groups on the surface of the HNTs and f-HNTs [27]. Also, the porous structure of the HNTs helps the water permeate through capillary action [32].…”

Section: Intrinsic Propertiesmentioning

confidence: 99%

Fabrication of functionalized halloysite nanotube blended ultrafiltration membranes for high flux and fouling resistance

Park

Yang

Park

et al. 2019

Environmental Engineering Research

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Halloysite nanotubes (HNTs) were functionalized using 3-aminopropyltriethoxysilane (APTES) and incorporated into polyethersulfone (PES) membranes to improve the hydrophilicity of the membranes as well as the interfacial interaction between HNTs and the polymer matrix. The intrinsic properties, permeability, and selectivity of the prepared membranes were analyzed to evaluate the membrane performance. In addition, humic acid (HA) fouling experiments were conducted to measure the antifouling properties of the fabricated membranes. As HNTs and functionalized HNTs (f-HNTs) contents are increased, hydrophilicity and mechanical strength were enhanced, and membranes with f-HNTs showed further improved performance. The pure water flux of membranes with 2% HNTs and f-HNT was 7.5 times higher than that of a pristine PES membrane without a trade-off relation between the water flux and HA rejection. The membranes with f-HNTs showed the highest antifouling properties compared to membranes with HNTs because enhanced hydrophilicity played a key role in preventing accumulation of HA.

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Nanotechnology for Environmental Pollution Detection and Remedies

Srivastava

Mishra

2021

Miniaturized Analytical Devices

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Enhanced antifouling performance of halloysite nanotubes (HNTs) blended poly(vinyl chloride) (PVC/HNTs) ultrafiltration membranes: For water treatment

Cited by 80 publications

References 57 publications

Polysulfone Membranes Embedded with Halloysites Nanotubes: Preparation and Properties

Polysulfone Membranes Embedded with Halloysites Nanotubes: Preparation and Properties

Fabrication of functionalized halloysite nanotube blended ultrafiltration membranes for high flux and fouling resistance

Nanotechnology for Environmental Pollution Detection and Remedies

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