Preparation of organic–inorganic hybrid membranes with superior antifouling property by incorporating polymer-modified multiwall carbon nanotubes

Zhu, Kai; Wang, Guibin; Zhang, Shuling; Du, Yinlong; Lu, Yaning; Na, Ruiqi; Mu, Yongfeng; Zhang, Yunhe

doi:10.1039/c7ra04248e

Cited by 18 publications

(11 citation statements)

References 43 publications

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“…The modification layer of pDA-f-TiO2 significantly reduced the membrane pore size according to the SEM analysis and remarkably improved the membrane selectivity. The hydrophilicity and permeate flux have been improved after coating for different intervals (15,30,60 and 120 min).…”

Section: Discussionmentioning

confidence: 99%

“…A variety of membranes including reverse osmosis (RO), nanofiltration (NF), and ultrafiltration (UF) membranes have been modified with pDA coating through hydrogen bonding, π-π stacking, the action of van der Waals forces and chelation [28]. This allows the grafting of different polymeric functional groups with their antifouling moieties such as zwitterionic polymers, hyper-branched polyglycerol and nanomaterials [29][30][31][32][33][34]. Kasemset et al.…”

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confidence: 99%

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Reduced Fouling Ultrafiltration Membranes via In-Situ Polymerisation Using Polydopamine Functionalised Titanium Oxide

Al-Shaeli¹,

Hegab²,

Fang³

et al. 2020

Preprint

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The trade-off phenomenon between selectivity and permeation flux is a major challenge in pressure-driven membranes, and specifically for ultrafiltration membranes. Currently, many research studies have been performed to try to increase permeability while maintaining the rejection at a high level. However, in most of these studies, the improvement of permeability was accompanied by a decrease in rejection or vice versa. To tackle this problem, TiO2 nanoparticles were attached on the surface of PES membranes using polydopamine as adhesive agent. In general, it is quite challenging to attach/bind TiO2 on the surface of membranes due to agglomeration of nanoparticles. Therefore, we developed a practical, simple and a scalable method to attach TiO2 nanoparticles (NPs) on the top surface of membrane using one-step dip coating. Experimental results revealed that the modified layer enhanced the hydrophilicity of the PES UF membranes as confirmed by the decrease of contact angle from. As a result, the modified membranes exhibited a significant improvement in anti-fouling properties, with 12 times higher water permeation flux (962 LMH for pDA-f-TiO2-PES30) as compared to the pristine PES membranes (79.9 LMH). The static adsorption of BSA on the surface of membranes was reduced from (60 µg/cm2 for pristine PES to 21 µg/cm2 for pDA-f-TiO2- PES120). Furthermore, the modified PES membranes displayed a higher flux recovery ratio (97%) and fouling reversibility (98.62%) than pristine PES membrane (37.63%). Also, the coated PES membranes bestowed a good antibacterial property relative to the pristine one. Besides, the membranes showed better physical and chemical stability as compared with unmodified PES membranes. Thus, this study provided a facile approach for enhancing the anti-fouling performance of PES ultrafiltration membranes.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Reduced Fouling Ultrafiltration Membranes via In-Situ Polymerisation Using Polydopamine Functionalised Titanium Oxide

Al-Shaeli¹,

Hegab²,

Fang³

et al. 2020

Preprint

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“…As shown from the Figure 2e,f, as expected, the morphology of the top layer of both membranes were similar, due to the absence of carbon fibers in this layer. The permeability of membrane materials is closely related to its morphology, porosity and wetability [32]. Thus, we compared the difference in roughness between a Car-PES membrane and a PES membrane using the AFM technique.…”

Section: Characterization Of the Car-pes Membranementioning

confidence: 99%

“…The permeability of membrane materials is closely related to its morphology, porosity and wetability [32]. Thus, we compared the difference in roughness between a Car-PES membrane and a PES membrane using the AFM technique.…”

Section: Characterization Of the Car-pes Membranementioning

confidence: 99%

Mitigation of Membrane Fouling Using an Electroactive Polyether Sulfone Membrane

et al. 2020

Membranes

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Membrane fouling is the bottleneck limiting the wide application of membrane processes. Herein, we adopted an electroactive polyether sulfone (PES) membrane capable of mitigating fouling by various negatively charged foulants. To evaluate anti-fouling performance and the underlying mechanism of this electroactive PES membrane, three types of model foulants were selected rationally (e.g., bovine serum albumin (BSA) and sodium alginate (SA) as non-migratory foulants, yeast as a proliferative foulant and emulsified oil as a spreadable foulant). Water flux and total organic carbon (TOC) removal efficiency in the filtering process of various foulants were tested under an electric field. Results suggest that under electrochemical assistance, the electroactive PES membrane has an enhanced anti-fouling efficacy. Furthermore, a low electrical field was also effective in mitigating the membrane fouling caused by a mixture of various foulants (containing BSA, SA, yeast and emulsified oil). This result can be attributed to the presence of electrostatic repulsion, which keeps foulants away from the membrane surface. Thereby it hinders the formation of a cake layer and mitigates membrane pore blocking. This work implies that an electrochemical control might provide a promising way to mitigate membrane fouling.

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“…This process was operated at 0.10 MPa for 90 min. Permeation flux (J) and rejection (R) can be calculated according to Equations (2) and (3) [37]:…”

Section: Filtration Experimentsmentioning

confidence: 99%

Highly Dual Antifouling and Antibacterial Ultrafiltration Membranes Modified with Silane Coupling Agent and Capsaicin-Mimic Moieties

et al. 2020

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Dual antifouling and antibacterial polysulfone(PSf)/polyethersulfone(PES) hybrid membranes were developed by the synergy of capsaicin-mimic N-(5-methyl acrylamide-2,3,4 hydroxy benzyl) acrylamide (AMTHBA) and vinyl triethylene (b-methoxy ethoxy) silane (VTMES). First, AMTHBA as a natural antimicrobial agent was incorporated into a casting solution via "microwave-assistance (MWA) in situ polymerization-blending" process to construct a hydroxyl-rich environment. Then, VTMES crosslinked to a hydroxyl-rich polymer matrix via hydrolytic condensation, and the influence of VTMES content on the hybrid membrane properties was systematically investigated. When the VTMES added amount was 1.0 wt %, the hybrid membrane achieved an optimal separation performance including a steady-state humic acid (HA) (5 mg/L) permeation flux of 326 L·m −2 ·h −1 and a rejection percentage of 97%. The antibacterial tests revealed that the hybrid membranes exhibited sustained bactericidal activity and effective inhibition of bacterial adhesion. Besides, the dual-functional membranes were clean as new after two-cycles filtration (with a cleaning efficiency of~90%), indicating that the network silicone film on the surface benefits the foulant repellence. Hopefully, the dual-functional membranes constructed in this study can be applicable to the pretreatment stage of water treatment.Polymers 2020, 12, 412 2 of 17 attachment of organic fouling and bacteria; (ii) bactericidal membranes for killing attached bacteria and preventing the formation of viable biofilm, which is principally against biofouling; and (iii) dual-functional bactericidal membranes for reducing both organic fouling and biofouling [13][14][15][16]. Among these, dual-functional bactericidal modification combining two strategies into one system is considered an ideal method. For example, Zhang et al.[17] designed a dual-functional antibacterial surface with a two-step surface modification strategy, aiming to acquire the properties of fouling resistance and antibacterial performance. Besides, Xie et al. [18] co-deposited polydopamine (PDA) and a zwitterionic polymer onto a polyethersulfone (PES) substrate and then immersed the surface in a AgNO 3 solution, leading to satisfactory antibacterial and antibiofouling properties. More recently, Wu et al. [19] synthesized a bifunctional membrane by incorporating silver-polydopamine nanohybrid (Ag-PDA) nanocomposites in a polysulfone membrane matrix. These results indicated the obvious advantages of dual functionality. However, due to the absence of strong bonding with surrounding polymers, active particles can be gradually leached out during operation, which could deteriorate the membrane antifouling efficiency [20]. In addition, the release of additional agents may have some potential impacts on the environment and human health [21].Capsaicin-mimic materials used as natural antifungal and antibacterial agents exhibit strong inhibition effects on various microbes and have been widely applied to resist marine or biomedical bacterial attachmen...

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Preparation of organic–inorganic hybrid membranes with superior antifouling property by incorporating polymer-modified multiwall carbon nanotubes

Abstract: Schematic illustration of (a) the polymerization of dopamine, and (b) preparation of the PVP-modified MWCNTs.

Cited by 18 publications

References 43 publications

Reduced Fouling Ultrafiltration Membranes via In-Situ Polymerisation Using Polydopamine Functionalised Titanium Oxide

Reduced Fouling Ultrafiltration Membranes via In-Situ Polymerisation Using Polydopamine Functionalised Titanium Oxide

Mitigation of Membrane Fouling Using an Electroactive Polyether Sulfone Membrane

Highly Dual Antifouling and Antibacterial Ultrafiltration Membranes Modified with Silane Coupling Agent and Capsaicin-Mimic Moieties

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