Nanoparticle-templated nanofiltration membranes for ultrahigh performance desalination

Wang, Zhenyi; Wang, Zhangxin; Lin, Shihong; Jin, Huile; Gao, Shoujian; Zhu, Yu

doi:10.1038/s41467-018-04467-3

Cited by 512 publications

(348 citation statements)

References 57 publications

(51 reference statements)

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“…The introduction of ferrofluid opens a new avenue in nanoscale flow regulation, by simultaneously providing a shapeable liquid–hydrophilic interface that enables excellent gating performance. The versatility and easy fabrication of the nanofluidic, which may benefit many practical applications such as microfluidic system and seawater desalination devices, hold promise for mass production. This work can be further generalized to other nanoscale pores for the exploitation of smart membrane materials, ranging from nanoscale reactors, chemical separations, and battery membrane to drug delivery, medical devices, and sensors for bioassays.…”

Section: Methodsmentioning

confidence: 99%

A Magnetic Gated Nanofluidic Based on the Integration of a Superhydrophilic Nanochannels and a Reconfigurable Ferrofluid

Wang

Zheng

et al. 2018

Advanced Materials

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gating as a promising candidate has been proposed as it is an easy manipulation and high stability method. [7] However, how to regulate the ion transport in nanoscale with excellent controllability, good stability, and high gating ratio remains a challenge.Ferrofluid as an intelligent liquid, which could reconfigure the surface topography under the magnetic field, could be used as a smart liquid gating to control the ion transport in nanoscale. Herein, we designed a magnetic gated nanofluidic (MGN) based on the integration of superhydrophilic nanochannels and reconfigurable ferrofluid. The reconfigurable shape of the ferrofluid, resembling the biological counterparts of the sebum membrane of the epidermis, is used to control the ion transport. As shown in Figure 1a,b, through manipulating the permanent magnet to change the steric configuration of the ferrofluid, [8] we constructed a switchable gating system with high gating ratio (≈10 000) and excellent stability (130 cycles). And the shapeable ferrofluid not only regulates the ion flow similar to the sebum membrane in immune systems but also realizes fast response to the magnetic field. The experiment and simulation analysis prove that the superhydrophilic surface with bound water is vital to our system, [9] which prevents the ferrofluid from entering the nanochannel of the membrane, and leads to a low oil adhesion further facilitating the high The design of intelligent gating in nanoscale is the subject of intense research motivated by a broad potential impact on science and technology. However, the existing designs require complex modification and are unstable, which restrict their practical applications. Here, a magnetic gated nanofluidic is reported based on the integration of superhydrophilic membranes and reconfigurable ferrofluid, which realizes the gating of the nanochannel by adjusting the steric configuration of the ferrofluid. This system could achieve ultrahigh gating ratio up to 10 000 and excellent stability up to 130 cycles without attenuation. Experiments and theoretical calculations demonstrate that the switch is controlled by the synergy of magnetic force and the interfacial tension. The introduction of ferrofluid and superhydrophilic nanochannels in this work presents an important paradigm for the nanofluidic systems and opens a new and promising avenue to various developments in the fields of materials science, which may be utilized in medical devices, nanoscale synthesis, and environmental analysis. FerrofluidsRegulating substances transport such as ion and water in nanoscale is of great significance in real-world applications, such as biological sensing, [1] drug delivery, [2] species separation, [3] energy harvesting, [4] etc. So far, various functional membranes for ion gating have been widely investigated with external triggers ranging from a single response to multiple responses. [5] Although those gating systems are intelligent and efficient, their applications are plagued with the problem of low stability, slow response, comple...

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Section: Methodsmentioning

confidence: 99%

A Magnetic Gated Nanofluidic Based on the Integration of a Superhydrophilic Nanochannels and a Reconfigurable Ferrofluid

Wang

Zheng

et al. 2018

Advanced Materials

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“…Among recently reported ultrathin membranes, the most promising materials for OSN are the PA and DLC membranes 2,11. It is worth noting that ultrathin PA membranes are also widely used for water filtration 12–19. Other promising ultrathin membranes for water filtration include those constructed by proteins,7 single‐walled carbon nanotubes (SWCNT),21–24 metal oxide nanowires,25,26 metal hydroxide nanostrands,27–30 graphene nanosheets,31,32 graphene oxide (GO) nanosheets,33–38 WS 2 nanosheets,40 and MoS 2 nanosheets 41…”

Section: For Liquid Filtrationmentioning

confidence: 99%

“…Aside from OSN, TFC membranes are also widely used in water desalination and wastewater purification 12–19. Because the PA active layer determines the separation performance of the TFC membrane, the construction of an ultrathin and high‐quality PA active layer is critical for producing an advanced TFC membrane with high water permeance and solute rejection.…”

Section: For Liquid Filtrationmentioning

confidence: 99%

“…For instance, by using a porous nanostrand membrane as a sacrificial layer, polyamide (PA) membranes as thin as 8.4 nm and diamond‐like carbon (DLC) membranes with thickness down to 10 nm were fabricated via interfacial polymerization (IP) reaction and chemical vapor deposition (CVD), respectively 2,11. Moreover, a series of thin‐film composite (TFC) membranes with a PA active layer less than 15 nm were fabricated via IP reaction on porous nanostrands or nanotube support membranes 12–19. 1D (such as nanotubes,20–24 nanowires,25,26 and nanostrands27–30) and 2D nanomaterials (such as graphene nanosheet derivatives31–38 and metal sulfide nanosheets39,40) have also been widely adopted to fabricate ultrathin network or laminar membranes with thickness of tens of nanometers via vacuum filtration.…”

Section: Introductionmentioning

confidence: 99%

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Ultrathin Membranes: A New Opportunity for Ultrafast and Efficient Separation

Gao

Wang

Fang

et al. 2020

Adv Materials Technologies

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membrane thickness L. However, mass transfer in a nonporous membrane is often described by solution diffusion theory, expressed by the integration of Fick's first law [8] J P p L = ∆ /where the permeation flux J of a dense membrane is directly proportional to the membrane permeability P and the net effective pressure difference (the hydraulic pressure difference minus the osmotic pressure difference) Δp, while inversely proportional to the membrane thickness L. Hence, a feasible concept for obtaining a high permeance membrane is to reduce the membrane thickness. This observation has driven much of the development of ultrathin membranes. An ideal ultrathin membrane or active layer should be as thin as possible to reduce the transfer path length and transfer resistance simultaneously without sacrificing its effective pore size. [9,10] Advanced membranes integrating both ultrathin membranes and large effective pore sizes to achieve ultrahigh permeance, excellent selectivity, and good mechanical stability are highly desired and the subject of extensive research.The rapid development of nanomaterials has provided new avenues toward ultrathin membranes construction. For instance, by using a porous nanostrand membrane as a sacrificial layer, polyamide (PA) membranes as thin as 8.4 nm and diamond-like carbon (DLC) membranes with thickness down to 10 nm were fabricated via interfacial polymerization (IP) reaction and chemical vapor deposition (CVD), respectively. [2,11] Moreover, a series of thin-film composite (TFC) membranes with a PA active layer less than 15 nm were fabricated via IP reaction on porous nanostrands or nanotube support membranes. [12][13][14][15][16][17][18][19] 1D (such as nanotubes, [20][21][22][23][24] nanowires, [25,26] and nanostrands [27][28][29][30] ) and 2D nanomaterials (such as graphene nanosheet derivatives [31][32][33][34][35][36][37][38] and metal sulfide nanosheets [39,40] ) have also been widely adopted to fabricate ultrathin network or laminar membranes with thickness of tens of nanometers via vacuum filtration. The thickness and effective pore size of these nanomaterial-based membranes can be controlled to some extent by tuning the filtrated volume of the nanomaterial dispersion solution.In this progress report, some promising ultrathin membranes are highlighted for liquid filtration or gas separation. In each section, the designs, fabrication techniques, and separation performances of these membranes are introduced. The Developing advanced membranes with both high permeance and selectivity to enable ultrafast and efficient separation is a persistent pursuit by materials scientists. In recent years, diverse ultrathin membranes with nanometer-scale thickness and unique membrane structures have been developed. These materials show ultrahigh permeance and excellent selectivity in water desalination, dye rejection, oil-water purification, and gas separation applications. Herein, current state-of-the-art ultrathin membranes are introduced, including polyamide membranes, diamond-like carbon m...

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“…These NF were tested for methyl blue model compound which gave high rejections up to 99.6% with a permeance of 33.0 L m −2 h −1 bar −1 . Wang et al[231] reported the fabrication of PA/CNT NF membranes with ultrahigh permeability and high rejection. The active layer was formed through interfacial polymerization on an UF support embedded with ZIF-8 nanoparticles.…”

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confidence: 99%

Reverse osmosis pretreatment technologies and future trends: A comprehensive review

2019

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Recent progress in reverse osmosis (RO) technology is not limited to RO membrane materials, module designs and RO process optimization. It involves prior feed treatment which directly impacts RO system performance. The ongoing challenges of membrane fouling in RO membranes can be addressed by increasing the operational efficiency through the use of correct pretreatment options which can mitigate organic and inorganic fouling by selectively rejecting contaminants prior to reaching the RO unit. Highly polluted water resources have put critical stress on the existing conventional pretreatment techniques, whereby membrane pretreatment has emerged as a promising alternative. This paper provides an overview of the development and current trends in conventional and nonconventional RO pretreatment techniques whereby the techniques are critically reviewed to 2 inform readers of potential improvements in such areas. This paper addresses the major drawbacks of conventional pretreatment methods which have necessitated the use of membrane pretreatment techniques. Special attention is given to microfiltration, ultrafiltration and nanofiltration methods and their development in terms of advanced membrane materials based on ceramics and self-cleaning membranes. Studies from laboratory scale standalone systems, pilot scale and large scale integrated systems for performance, cost and ecological analysis have been reviewed to familiarize readers with the many factors which need to be analyzed for selection of the appropriate pretreatment method(s). The critical review in this paper will help researchers focus more on the areas which have room for further development for cost-effective and advanced RO pretreatment techniques.

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Nanoparticle-templated nanofiltration membranes for ultrahigh performance desalination

Cited by 512 publications

References 57 publications

A Magnetic Gated Nanofluidic Based on the Integration of a Superhydrophilic Nanochannels and a Reconfigurable Ferrofluid

A Magnetic Gated Nanofluidic Based on the Integration of a Superhydrophilic Nanochannels and a Reconfigurable Ferrofluid

Ultrathin Membranes: A New Opportunity for Ultrafast and Efficient Separation

Reverse osmosis pretreatment technologies and future trends: A comprehensive review

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