Highly water-selective hybrid membrane by incorporating g-C3N4 nanosheets into polymer matrix

Cao, Keteng; Jiang, Zhongyi; Zhang, Xiaoshan; Zhang, Yamin; Zhao, Jing; Xing, Ruisi; Yang, Sen; Gao, Chengyun; Pan, Fusheng

doi:10.1016/j.memsci.2015.04.050

Cited by 205 publications

(56 citation statements)

References 66 publications

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“…The buckled sheets of carbon nitride which self‐assemble to form pillar‐like structure probably facilitates faster Li + ‐ion movement thereby leading to doubling of the specific capacity in the native form. The linear alignment of the pores provides fast transport channels for the movement of Li + ‐ions along the c‐direction, in addition to the conventional transport along the a‐b plane . This phenomenon is coupled to the reduced content of quaternary N groups which generates superior reversibility in the material and thereby improving capacity.…”

Section: Resultsmentioning

confidence: 99%

“…Extensive research has shown that it is even possible to map the exact location of the cations and anions in such pockets . Li‐ions, being the smallest cation, may be housed and transported through these pores within the material . This is contrary to graphite or graphene based carbonaceous materials, where ion conduction predominantly takes place in 2‐D in between the layers.…”

Section: Introductionmentioning

confidence: 99%

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Li–Ion‐Conducting Pillar‐Like Graphitic Carbon Nitrides as Novel Anodes for Li–Ion Batteries

2018

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There is still a sustained effort to explore and develop new electrode materials for Li‐ion rechargeable batteries. Presently, materials exploration not only focuses on the enhancement of Li‐ion battery performance, but also targets to make them cheaper and safer. This expectedly will make them market competitive against established battery chemistries. Graphitic carbon nitride (g‐C3N4), which has emerged as an important photon harvesting material, is demonstrated here as a potential efficient and cost effective alternative anode for Li‐ion cells. The g‐C3N4, synthesized here from pyrolysis of thiourea, possesses both graphitic and amorphous phases (T‐gCN). The intercalation of Li+ ions in the densely packed layered structure of T‐gCN (lithiated T‐gCN) results in an ionic conductivity ≈ 10−7 S/cm compared to the non‐lithiated T‐gCN which shows no ionic conductivity. The ionic transport takes place via both the amorphous and graphitic phases in T‐gCN. The T‐gCN when treated with an acidified dichromate solution disintegrates in to filaments, which on prolonged stirring self‐assemble into pillar‐like g‐C3N4 structures (T‐gCNP). The T‐gCNP exhibited higher crystallinity and an even higher ionic conductivity compared to the T‐gCN. The T‐gCN and T‐gCNP deliver modest specific capacities compared to battery grade graphite and other reported carbonaceous/non‐carbonaceous materials in the half‐cell operation. However, when coupled with cathodes such as LiFePO4 and LiMn2O4 in a full Li‐ion cell, the specific capacity obtained in the 1st discharge cycle for both LiFePO4 and LiMn2O4 are very close to their theoretical capacities. The cells display stable cycling and good current rate capability over widely varying current values. This is remarkable in spite of the fact that the samples are not completely crystalline with an average carbon content of approximately 31%. It is envisaged that a continuous network persists for electron transport for their participation in the reversible redox process.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Li–Ion‐Conducting Pillar‐Like Graphitic Carbon Nitrides as Novel Anodes for Li–Ion Batteries

2018

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“… Hybridmembranen aus 2D‐Materialien: a) Schematische Darstellung des Zusammenbaus von GO‐Nanoblättern in einer Polymerumgebung auf Basis von Wasserstoffbrücken zwischen verschiedenen Gruppen am GO der PEBA‐Kette . b) Hoch wasserselektive Hybridmembran durch Einbau von g‐C 3 N 4 ‐Nanoblättern in eine Polymermatrix . c) Synthese einer ultradünnen ZIF‐8/GO‐Membran: Aufbringen von flexiblen ZIF‐8/GO‐Nanoblättern auf einen porösen Träger (z.…”

Section: Schichtförmige Membranen Aus Zweidimensionalen Materialienunclassified

“…Mithilfe einer Polymermatrix konnten mehrere 2D‐Materialien, die sich bei der Bildung von reinen schichtförmigen Membranen als problematisch erwiesen haben, als MMMs hergestellt werden. Zum Beispiel wurde graphitisches Kohlenstoffnitrid (g‐C 3 N 4 , CN), ein neuartiges graphenanaloges Material mit regelmäßig in der gesamten schichtförmigen Struktur verteilten dreieckigen Nanoporen (geschätzte Größe 0.31 nm), in eine Natriumalginat‐Matrix eingebaut, um seine Wirkung bei der Membrantrennung zu bestimmen (Abbildung b) . Die horizontal ausgerichtete schichtförmige Struktur von in MMMs eingebetteten CNs ergibt geordnete Kanäle für einen Wassertransport, während die nanoporöse Struktur der CNs einen Molekularsiebeffekt bietet.…”

Section: Schichtförmige Membranen Aus Zweidimensionalen Materialienunclassified

Membranen aus zweidimensionalen Materialien: eine neue Familie hochleistungsfähiger Trennmembranen

Liu

Jin

2016

Angewandte Chemie

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Seit einiger Zeit werden zweidimensionale (2D‐)Materialien mit einer Dicke im atomaren Bereich als Nanobaueinheiten verwendet, um hochleistungsfähige Trennmembranen zu entwickeln, die einzigartige Nanoporen und/oder Nanokanäle bieten. Diese 2D‐Material‐Membranen zeigen außergewöhnliche Permeationseigenschaften, was einen neuen Weg zu ultraschnellen und hoch selektiven Membranen für die Wasser‐ und Gastrennung ebnet. In diesem Kurzaufsatz fassen wir die letzten richtungsweisenden Studien zu 2D‐Material‐Membranen in Form von Nanoblättern und schichtförmigen Membranen zusammen, wobei der Schwerpunkt auf den Ausgangsmaterialien, den Nanostrukturen und den Transporteigenschaften liegen wird. Außerdem diskutieren wir kurz Herausforderungen und zukünftige Richtungen der 2D‐Material‐Membran für eine verbreitete Umsetzung in der Praxis.

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“…In the case of positively charged Rh and MB, the effect of the physical absorption increases to $20%, probably due to steric effects with negatively charged g-C 3 N 4 . Two very recent references indicate that g-C 3 N 4 incorporated with graphene oxide 64 or polymer 65 can act as a separation membrane. However, the bare g-C 3 N 4 membrane is unable to separate organic dyes from water under dark conditions.…”

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confidence: 99%

Self-catalytic membrane photo-reactor made of carbon nitride nanosheets

et al. 2016

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Showcasing research from the University of Manchester. Self-catalytic membrane photo-reactor made of carbon nitride nanosheetsA novel membrane photo-reactor (MPR) was made of graphitic carbon nitride (g-C 3 N 4 ) nanosheets. The g-C 3 N 4 MPR is used as both separation layer and catalyst for high effi cient photo-oxidation of organic dyes. As featured in:See Solar-driven photo-oxidation is a very attractive and efficient technique for chemical conversion of organic dyes in water into non-hazardous compounds, but it requires a catalyst in order to overcome the barrier of oxidation degradation. In this study we use a membrane photo-reactor (MPR) made of nanosheets of graphitic carbon nitride (g-C 3 N 4 ), assembled by vacuum filtration. The membrane was characterized by X-Ray Diffraction (XRD), Nuclear Magnetic Resonance (NMR), electron microscopy and IR spectroscopy.Photo-degradation studies show that the membranes are very efficient in the degradation of Sudan orange G, rhodamine 110 and methylene blue. As the catalyst is a porous laminate, the reactant can flow through the pores of the membrane. Because the space between g-C 3 N 4 nanosheets is comparable to the size of the dyes, the probability of the reactants to be close to the catalyst is enhanced, making the reaction very efficient.

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Highly water-selective hybrid membrane by incorporating g-C3N4 nanosheets into polymer matrix

Cited by 205 publications

References 66 publications

Li–Ion‐Conducting Pillar‐Like Graphitic Carbon Nitrides as Novel Anodes for Li–Ion Batteries

Li–Ion‐Conducting Pillar‐Like Graphitic Carbon Nitrides as Novel Anodes for Li–Ion Batteries

Membranen aus zweidimensionalen Materialien: eine neue Familie hochleistungsfähiger Trennmembranen

Self-catalytic membrane photo-reactor made of carbon nitride nanosheets

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