Thin film composite membranes combining carbon nanotube intermediate layer and microfiltration support for high nanofiltration performances

Wu, Ming-Bang; Lv, Yan; Yang, Hao; Liu, Lifen; Xi, Zengzhe; Xu, Zhi‐Kang

doi:10.1016/j.memsci.2016.05.056

Cited by 267 publications

(98 citation statements)

References 32 publications

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“…The salt rejection and water permeance of the as-prepared NFMs were even comparable to some of the high-flux polyamide NFMs fabricated throughc onventionali nterfacialp olymerization. [44,45] We suggest the high performance of the TFC NFMs was derived from the defect-free ultrathin selectivel ayers, combined with the strongb inding between the selective layers and the substrate surfaces.…”

Section: Performance Of the Alginate Tfc Nfmsmentioning

confidence: 97%

Ultrathin Alginate Coatings as Selective Layers for Nanofiltration Membranes with High Performance

Zhang

Zhong

et al. 2017

ChemSusChem

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It is highly desirable to develop environmentally friendly processes for fabricating thin-film composite (TFC) nanofiltration membranes (NFMs) from natural materials. However, the nanofiltration performance of such TFC NFMs is not satisfactory for practical applications owing to the lack of efficient methods for constructing ultrathin, uniform, stable coatings as selective layers. In this study, a contra-diffusion strategy is used to fabricate TFC NFMs with ultrathin cross-linked alginate coatings as selective layers without the use of any organic solvents. The as-prepared NFMs show a water permeation flux that is nearly one order of magnitude higher than that of other alginate-based TFC NFMs with similar salt rejection, and represents the best performance among all TFC NFMs from natural materials. These NFMs also demonstrate excellent mono-/divalent ion selectivity, as well as good long-term operation stability and antifouling properties. Furthermore, this strategy maximizes the reactant usage rate, minimizes the waste discharge and provides new insight into environmentally friendly fabrication of TFC NFMs.

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Section: Performance Of the Alginate Tfc Nfmsmentioning

confidence: 97%

Ultrathin Alginate Coatings as Selective Layers for Nanofiltration Membranes with High Performance

Zhang

Zhong

et al. 2017

ChemSusChem

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“…This variation trend of salt rejection indicates that Donnan exclusion plays an important role in controlling the separation performance of the TFC NF membranes. 28,29 The zeta potential results in Fig. 7 show that the TFC NF membranes are negatively charged, which means that there is much stronger electrostatic repulsive interaction between divalent anions (SO 4 2À ) and the membrane surface, thus the rejections for both Na 2 SO 4 and MgSO 4 are higher than that for MgCl 2 and NaCl.…”

Section: Separation Performance Of Tfc Membranesmentioning

confidence: 99%

Modification of polyamide TFC nanofiltration membrane for improving separation and antifouling properties

et al. 2018

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In this work, a dendrimer trimesoyl amide amine (TMAAM) monomer was proposed to be used as a key functional monomer to modify the conventional aromatic polyamide thin-film composite (TFC) nanofiltration (NF) membrane, and a new kind of TMAAM-based semi-aromatic polyamide composite NF membrane was thus prepared by interfacial polymerization. The effects of the PIP/TMAAM ratio (PIP ¼ piperazine) on the membrane chemical structure, surface properties and separation performances were investigated systematically. With the increase in TMAAM content loaded in the membrane, the water flux strongly increased but the salt rejection decreased only slightly. When the PIP/TMAAM ratio was 1, the membrane NF-2 exhibited a smoother and more hydrophilic surface, as a result of which it displayed an optimum separation performance for different valent salts. In addition, the TMAAM modified TFC membrane presented an extremely high rejection to negatively charged dye molecules and high permeation for monovalent salts, leading to good prospects for dye/salt separation application. Moreover, both the water flux and salt rejection of the TMAAM-based membrane were stable in a longterm running process, and the membrane showed a favourable anti-fouling property and efficient cleaning recovery. Therefore, this work provides a new type of semi-aromatic polyamide composite NF membrane fabricated by a facile and straightforward method via interfacial polymerization with high hydrophilicity, good stability and strong anti-fouling property.

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“…However, this approach was hindered by CNTs agglomeration and CNTs/polymer incompatibility. As reported [24][25][26][27], a CNTs interlayer between the support layer with large pores and the PA layer can fine-tune the surface properties of support layer and control the IP reaction. Zhang et al deposited graphene oxide and multiwall CNTs (GO/MWCNT) composite as an interlayer on polyethersulfone (PES) MF substrate for fabricating TFC membrane with water flux of 26.7 L m −2 h −1 using 1 M NaCl as a draw solution and DI water as a feed solution [20].…”

Section: Introductionmentioning

confidence: 74%

“…The pure water permeability was carried out using a dead-end filtration system to evaluate the permeability of SWCNTs interlayers. The surface zeta potential was evaluated using 0.005 mol L −1 KCl aqueous solution at pH 7.0 at room temperature by an electrokinetic analyzer (SF-SA, Saifei, Hangzhou, China) [26]. The mechanical properties including tensile strength, Young's modulus and elongation at break were measured with a sample size of 1 cm × 0.5 cm by the tensile testing equipment (QJ210, Aike Technology, Shanghai, China) according to an ASTM method.…”

Section: Characterizationmentioning

confidence: 99%

Thin Film Composite Forward Osmosis Membrane with Single-Walled Carbon Nanotubes Interlayer for Alleviating Internal Concentration Polarization

Tang

et al. 2020

Polymers

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This study reported a series of thin film composite (TFC) membranes with single-walled nanotubes (SWCNTs) interlayers for the forward osmosis (FO) application. Pure SWCNTs with ultrahigh length-to-diameter ratio and without any functional group were applied to form an interconnect network interlayer via strong π-π interactions. Compared to the TFC membrane without SWCNTs interlayer, our TFC membrane with optimal SWCNTs interlayer exhibited more than three times the water permeability (A) of 3.3 L m−2h−1bar−1 in RO mode with 500 mg L−1 NaCl as feed solution and nearly three-fold higher FO water flux of 62.8 L m−2 h−1 in FO mode with the deionized water as feed solution and 1 M NaCl as draw solution. Meanwhile, the TFC membrane with SWCNTs interlayer exhibited significantly reduced membrane structure parameters (S) to immensely mitigate the effect of internal concentration polarization (ICP) in support layer with micro-sized pores in favor of higher water flux. It showed that the pure SWCNTs interlayer could be an effective strategy to apply in FO membranes.

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Thin film composite membranes combining carbon nanotube intermediate layer and microfiltration support for high nanofiltration performances

Cited by 267 publications

References 32 publications

Ultrathin Alginate Coatings as Selective Layers for Nanofiltration Membranes with High Performance

Ultrathin Alginate Coatings as Selective Layers for Nanofiltration Membranes with High Performance

Modification of polyamide TFC nanofiltration membrane for improving separation and antifouling properties

Thin Film Composite Forward Osmosis Membrane with Single-Walled Carbon Nanotubes Interlayer for Alleviating Internal Concentration Polarization

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