Ultrathin Polyamide Nanofiltration Membrane Fabricated on Brush-Painted Single-Walled Carbon Nanotube Network Support for Ion Sieving

Gao, Shoujian; Zhu, Yu; Gong, Yuqiong; Wang, Zhenyi; Fang, Wangxi; Jin, Jian

doi:10.1021/acsnano.8b09761

Cited by 307 publications

(168 citation statements)

References 55 publications

Supporting

Mentioning

168

Contrasting

Order By: Relevance

“…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%

“…Compared with conventional ultrafiltration membrane support layers, the nanomaterial‐based networks have higher porosity, more uniform pores, and smoother surfaces, which enable a more homogeneous distribution and diffusion of monomers during the IP reaction, allowing more precise control over PA layer formation. The development of TFC NF membranes with ultrathin PA active layers break through the longstanding “tradeoff” relationship between permeance and salt rejection in TFC membranes and bring NF membrane performance to a new level 14,18,19. TFC forward osmosis (FO) membranes with ultrathin PA active layers can also be fabricated using a PD‐SWCNT network membrane as a support layer 16.…”

Section: For Liquid Filtrationmentioning

confidence: 99%

“…Recently, brush‐painting and spraying techniques have proven efficient in fabricating large‐area nanomaterial‐based networks. By painting a dispersion solution of sodium dodecyl benzene sulfonate modified SWCNT (SDBS‐SWCNT) onto a polymeric MF membrane with specific cycles, a uniform SWCNT network membrane can be easily fabricated ( Figure ) 14. The pore size and thickness of the membrane is also controlled by the painting cycles.…”

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%

See 4 more Smart Citations

Ultrathin Membranes: A New Opportunity for Ultrafast and Efficient Separation

Gao

Wang

Fang

et al. 2020

Adv Materials Technologies

Self Cite

View full text Add to dashboard Cite

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...

show abstract

Section: For Liquid Filtrationmentioning

confidence: 99%

Section: For Liquid Filtrationmentioning

confidence: 99%

Section: For Liquid Filtrationmentioning

confidence: 99%

Section: For Liquid Filtrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Ultrathin Membranes: A New Opportunity for Ultrafast and Efficient Separation

Gao

Wang

Fang

et al. 2020

Adv Materials Technologies

Self Cite

View full text Add to dashboard Cite

show abstract

Ultraselective and Highly Permeable Polyamide Nanofilms for Ionic and Molecular Nanofiltration

Sarkar

Modak

Karan

2020

Adv Funct Materials

220

144

View full text Add to dashboard Cite

Membranes with ultrahigh ion selectivity and high liquid permeance are needed to produce high-quality product water with increased recovery and process efficiency in water desalination. The narrow pore size distribution and controlled surface charge in the separation layer of nanofiltration membranes significantly improve the ion selectivity through molecular sieving and Donnan exclusion of co-ions. Here, the ultraselective and yet highly water permeable polyamide nanofilm composite nanofiltration membranes developed by precisely controlling the kinetics of the interfacial polymerization reaction by maintaining the stoichiometric equilibrium at the interface is reported. The kinetically favorable stoichiometric equilibrium condition prohibits the formation of aggregate pores in the nanofilm and leads to the formation of narrow network pores with a high surface negative charge. Nanofilms are designed with a controlled degree of crosslinking and made as thin as ≈7 nm to achieve increased water permeance. The ultraselective membranes exhibit up to 99.99% rejection of divalent salt (Na 2 SO 4) and demonstrate monovalent to divalent ion selectivity of >4000. The selectivity of these nanofilm composite membranes is beyond the permeance-selectivity upper-bound line of the state-of-the-art nanofiltration membranes and one to two orders of magnitude higher than the commercially available membranes with pure water permeances of up to 23 L m −2 h −1 bar −1. The fabrication process is scalable for membrane manufacturing.

show abstract

A Nano‐Heterogeneous Membrane for Efficient Separation of Lithium from High Magnesium/Lithium Ratio Brine

Peng

Zhen

2021

Adv Funct Materials

219

View full text Add to dashboard Cite

Lithium extraction from salt lake brines is highly demanded to circumvent the lithium supply shortage. However, polymer nanofiltration membranes suffer from low lithium permeability while nanofluidic devices are hindered by complicated preparation and miniaturized scales despite high permeability. Here, the authors report a facile strategy to prepare positively charged nanofiltration membranes for ultrapermeable and selective separation of lithium ions from concentrated magnesium/lithium mixtures. A new electrolyte monomer (diaminoethimidazole bromide, DAIB) containing bidentate amine groups is designed to modify pristine polyamide composite membranes. Structure characterizations and simulations show that the DAIB modification brings about nano-heterogeneity that not only improves surface hydrophilicity, but also reduces water transport resistance through the ≈100 nm thick separation layer. Water permeance of the modified membrane improves fivefold and is coupled with good stability in 200-h continuous nanofiltration. It exhibits high lithium flux (0.7 mol m −2 h −1) for brines (Mg 2+ /Li + ratio 20) at 6 bar operation pressure.

show abstract

Ultrathin Polyamide Nanofiltration Membrane Fabricated on Brush-Painted Single-Walled Carbon Nanotube Network Support for Ion Sieving

Cited by 307 publications

References 55 publications

Ultrathin Membranes: A New Opportunity for Ultrafast and Efficient Separation

Ultrathin Membranes: A New Opportunity for Ultrafast and Efficient Separation

Ultraselective and Highly Permeable Polyamide Nanofilms for Ionic and Molecular Nanofiltration

A Nano‐Heterogeneous Membrane for Efficient Separation of Lithium from High Magnesium/Lithium Ratio Brine

Contact Info

Product

Resources

About