Nanofiltration membranes with narrowed pore size distribution via pore wall modification

Du, Yong; Lv, Yan; Qiu, Wen‐Ze; Wu, Jian; Xu, Zhi‐Kang

doi:10.1039/c6cc03842e

Cited by 70 publications

(43 citation statements)

References 33 publications

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“…Recent years have witnessed an increase in the application of nanofiltration processes in wastewater treatment, seawater desalination, food engineering, chemical synthesis, and compound purification . Nanofiltration membranes (NFMs) play a critical role in these processes, with several celebrated advantages, such as satisfactory rejection of multivalent ions and low molecular weight organic compounds (200–1000 Da), acceptable water or solvent permeation flux, and relatively low cost . In addition, nanofiltration is generally considered as more sustainable than other separation processes, including distillation, adsorption, and reverse osmosis owing to its energy‐saving, low‐carbon nature .…”

Section: Introductionsupporting

confidence: 68%

“…The selectivity of solute A to solute B,

α \binom{A}{B}

is defined as in previous reports [Eq. ]:,

true α_{normalB}^{A} = \frac{100 - R_{A}}{100 - R_{B}}

…”

Section: Methodsmentioning

confidence: 99%

“…The TFC NFMs displayed moderate rejectiono f MgSO 4 because of charges creening by divalent metal ions to reduce the membrane surface charge. [34] The TFC NFMs showedl ow rejection to NaCl, MgCl 2 ,a nd CaCl 2 as the hydrated Cl À ions were too small, [6] and the cationsc ould be hardly rejected purely based on steric hindrance. The molecular weightc ut-off (MWCO) of the TFC NFMs was estimated to be 540 Da, whichi st ypical for nanofiltration, [24] by measuring the rejectiono fo ligo(ethyleneg lycol) (OEG) with different molecular weights (Figure 5b).…”

Section: Performance Of the Alginate Tfc Nfmsmentioning

confidence: 99%

“…PANu ltrafiltration substrates were hydrolyzed according to our previous study. [6] Briefly,t he membranes were first incubated in 1.5 m sodium hydroxide solution for 1h at 50 8C, and then transferred into a1m hydrochloric acid solution for protonation for 1h at 25 8C. The hydrolyzed PANs ubstrates were washed several times with 50 mL ultrapure water each time and used as the pristine substrate.…”

Section: Membrane Fabricationmentioning

confidence: 99%

“…[4,5] Nanofiltration membranes (NFMs) play ac riticalr ole in these processes, with severalc elebrated advantages, such as satisfactory rejection of multivalent ions and low molecular weight organic compounds (200-1000 Da), acceptablew ater or solventp ermeation flux, and relatively low cost. [1,6] In addition, nanofiltration is generally considered as more sustainable than other separationp rocesses, including distillation, adsorption, and reverse osmosis owing to its energy-saving, low-carbon nature. [7][8][9][10] Amonga ll NFMs,t hinfilm composite (TFC) NFMs exhibit the best performance in both scientificr esearch and industrial application in terms of salt rejection and permeation flux.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionsupporting

confidence: 68%

“…The selectivity of solute A to solute B,

α \binom{A}{B}

is defined as in previous reports [Eq. ]:,

true α_{normalB}^{A} = \frac{100 - R_{A}}{100 - R_{B}}

…”

Section: Methodsmentioning

confidence: 99%

Section: Performance Of the Alginate Tfc Nfmsmentioning

confidence: 99%

Section: Membrane Fabricationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Zhang

Zhong

et al. 2017

ChemSusChem

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Photocatalytic Nanofiltration Membranes with Self‐Cleaning Property for Wastewater Treatment

Zhang

et al. 2017

Adv Funct Materials

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277

104

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Membrane fouling is one of the most severe problems restricting membrane separation technology for wastewater treatment. In this work, we report a photocatalytic nanofiltration membrane (NFM) with self-cleaning property via a facile biomimetic mineralization process. In our strategy, a polydopamine (PDA)/polyethyleneimine (PEI) intermediate layer was fabricated on an ultrafiltration membrane via a co-deposition method followed by mineralization of a photocatalytic layer consisting of β-FeOOH nanorods. The PDA-PEI layer acts as both a nanofiltration selective layer and an intermediate layer for anchoring the β-FeOOH nanorods via strong coordination complexes between Fe 3+ and catechol groups. In visible light, the β-FeOOH layer exhibits efficient photocatalytic activity for degrading dyes through the photo-Fenton reaction in the presence of H 2 O 2 , endowing the NFM concurrently with effective nanofiltration performance and self-cleaning capability. Moreover, the mineralized NFMs exhibit satisfactory stability under simultaneous filtration and photocatalysis processing, showing great potential in advanced wastewater treatment.

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Dopamine: Just the Right Medicine for Membranes

Yang

Waldman

et al. 2018

Adv Funct Materials

249

162

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Mussel-inspired chemistry has attracted widespread interest in membrane science and technology. Demonstrating the rapid growth of this field over the past several years, substantial progress has been achieved in both mussel-inspired chemistry and membrane surface engineering based on musselinspired coatings. At this stage, it is valuable to summarize the most recent and distinctive developments, as well as to frame the challenges and opportunities remaining in this field. In this review, we present recent advances in rapid and controllable deposition of mussel-inspired coatings, dopamine-assisted co-deposition technology and photo-initiated grafting directly on mussel-inspired coatings. Some of these technologies have not yet been employed directly in membrane science. Beyond discussing advances in conventional membrane processes, we discuss emerging applications of mussel-inspired coatings in membranes, including as a skin layer in nanofiltration, interlayer in metalorganic framework based membranes, hydrophilic layer in Janus membranes and protective layer in catalytic membranes. Finally, we raise some critical unsolved challenges in this field and propose some potential pathways to address them.

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Nanofiltration membranes with narrowed pore size distribution via pore wall modification

Cited by 70 publications

References 33 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

Photocatalytic Nanofiltration Membranes with Self‐Cleaning Property for Wastewater Treatment

Dopamine: Just the Right Medicine for Membranes

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