Membranes with selective laminar nanochannels of modified reduced graphene oxide for water purification

Liang, Bin; Zhang, Pan; Wang, Jianqiang; Qu, Jin; Wang, Lifang; Wang, Xiuxing; Guan, Chunfeng; Pan, Kai

doi:10.1016/j.carbon.2016.03.001

Cited by 98 publications

(35 citation statements)

References 44 publications

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“…Though the initial smooth surface of GQDs‐TRG‐3 membrane became rough with partial sludge cake after 120 h (Figure S5a, Supporting Information), the cross‐section energy dispersive X‐ray spectroscopy (EDX) analysis (Figure S5b, Supporting Information) demonstrated the EB molecules were effectively washed away. These separation performances are pretty outstanding compared with those reported in graphene‐related membrane in dead‐end module or other separation modules, as well as other commercial membranes with similar rejection (Table S1, Supporting Information) …”

Section: Resultsmentioning

confidence: 65%

Robust GQDs Modified Thermally Reduced Graphene Oxide Membranes for Ultrafast and Long‐Term Purification of Dye‐Wasted Water

Ying

Wei

et al. 2017

Adv Materials Inter

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Graphene‐related membranes have shown promising potential for water purification. However, both high stability and efficient separation performance of graphene‐related membranes for long‐term operation are urgently requested for their real applications. Here, a robust graphene quantum dots (GQDs) modified thermally reduced graphene oxide (TRG) (GQDs‐TRG) membrane is assembled from GQDs modified TRG aqueous dispersion. The GQDs‐TRG membrane demonstrates an excellent long‐term continuous separation performance in cross‐flow module, with a water permeance of 2000 ± 70 L per hour per square meter per bar (LHM bar−1) and 96 ± 0.2% rejection of Evans Blue (EB). The water permeance is 27 times higher than that of graphene oxide membrane and about two orders of magnitude higher than those of commercial filtration membranes with similar rejection. The gravity‐driven separation experiments on a dead‐end setup and nonequilibrium molecular dynamics simulation further confirm the surface cross flow is beneficial to enhancing the durability of GQDs‐TRG membrane on cross‐flow system. On gravity‐driven separation system, under 10 cm liquid column, the GQDs‐TRG membrane (2.34 µm thickness and 12.56 cm2 effective area) exhibits a water permeance of 800 ± 30 LHM bar−1, EB rejection above 95 ± 0.4%, and durability more than 7 month operation. These GQDs‐TRG membranes show the great potential for the long‐term purification of dye‐wasted water with high stability and suitability.

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Section: Resultsmentioning

confidence: 65%

Robust GQDs Modified Thermally Reduced Graphene Oxide Membranes for Ultrafast and Long‐Term Purification of Dye‐Wasted Water

Ying

Wei

et al. 2017

Adv Materials Inter

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“…Such nanochannels have also been found in other 2‐D‐based membranes, such as WS 2 and MoS 2 . Moreover, several modification methods can further improve the water flux of 2‐D‐based membranes by creating additional space or channels . For example, Chen et al created reduced GO membranes with a high water flux by enlarging the interlayer spacing with carbon nanotubes.…”

Section: Introductionmentioning

confidence: 95%

Enhanced water flux through graphitic carbon nitride nanosheets membrane by incorporating polyacrylic acid

et al. 2018

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Membranes assembled from two-dimensional (2-D) layered materials have shown potential use in water purification. Recently, a 2-D graphitic carbon nitride (g-C 3 N 4 ) nanosheets membrane exhibits considerable separation performance in water purification. In this study, to further improve this water separation performance, polyacrylic acid (PAA) was introduced to tune the nanochannels formed between the g-C 3 N 4 nanosheets. The fabricated g-C 3 N 4 -PAA hybrid membranes possessed higher water flux without sacrificing much rejection rate compared with that of the g-C 3 N 4 membrane; however, noticeable fouling was observed upon addition of the PAA into the membrane composite structure. In addition, the effect of PAA on the morphology, surface hydrophilicity, separation performance, and antifouling properties of the g-C 3 N 4 membrane were examined in detail. Overall, incorporating PAA into the g-C 3 N 4 nanosheets membrane was an effective and convenient method to improve the water separation performance, which could promote the application of the 2-D g-C 3 N 4 nanosheets membrane in practical ultrafiltration processes.

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“…Due to good interfacial compatibility with polymeric materials these materials form nanocomposite membranes with high water flux, showed better antifouling performance and high salt rejection properties. As antibacterial agents, these materials find application in water treatment, purification and desalination [143][144][145][146]. Yasin et al [58] fabricated mesoprous carbon nano-composite polyethersulfone membranes and observed high antibacterial ability and protein rejection when these membranes have 0.20 wt % concentration of MCNs.…”

Section: Carbon Based Polymeric Nano-composite Membranesmentioning

confidence: 99%

A Comprehensive Review on Polymeric Nano-Composite Membranes for Water Treatment

Zahid¹,

Rashid²,

Akram³

et al. 2018

J Membr Sci Technol

175

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During last few decades, membrane technology has emerged as an efficient technique over conventional methods due to its high removal capacity, ease in operation and cost effectiveness for wastewater treatment and production of clean water. Membrane based separations are commonly based on polymeric membranes because of their higher flexibility, easily pore forming mechanism, low cost and smaller space for installation as compared to inorganic membranes. Commonly employed membrane fabrication phase inversion method has been shortly reviewed in this article. Major limitation of membrane based separations is fouling and polymeric membranes being hydrophobic in nature are more prone to fouling. Fouling is a deposition of various colloidal particles, macromolecules (polysaccharides, proteins), salts etc. on membrane surface and within pores thus impedes membrane performance, reduces flux and results in high cost. Modification of polymeric membranes due to its tailoring ability with nanomaterials such as metal based and carbon based results in polymeric nano-composite membranes with high antifouling characteristics. Nanomaterials impart high selectivity, permeability, hydrophilicity, thermal stability, mechanical strength, and antibacterial properties to polymeric membranes via blending, coating etc. modification methods. Characterization techniques has also discussed in later section for studying morphological properties and performance of polymer nano-composite membranes. Graphical Abstract

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Membranes with selective laminar nanochannels of modified reduced graphene oxide for water purification

Cited by 98 publications

References 44 publications

Robust GQDs Modified Thermally Reduced Graphene Oxide Membranes for Ultrafast and Long‐Term Purification of Dye‐Wasted Water

Robust GQDs Modified Thermally Reduced Graphene Oxide Membranes for Ultrafast and Long‐Term Purification of Dye‐Wasted Water

Enhanced water flux through graphitic carbon nitride nanosheets membrane by incorporating polyacrylic acid

A Comprehensive Review on Polymeric Nano-Composite Membranes for Water Treatment

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