Orderly stacked ultrathin graphene oxide membranes on a macroporous tubular ceramic substrate

Wang, Qiaomu; Zhao, Guangjin; Li, Chunxi; Meng, Hong

doi:10.1016/j.memsci.2019.05.051

Cited by 33 publications

(10 citation statements)

References 44 publications

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“…(f, g) Water permeance and MB rejection of the ZIF-8 grown nanosheet films after different cycles. (h) Comparison of MB rejection and water permeance of H–Ti 0.6 Fe 0.4 O 2 /ZIF-8 with other 2D material-based membranes reported in the literature. − ,,,− The data details can be found in Table S1.…”

Section: Results and Discussionmentioning

confidence: 99%

Controlled Synthesis of Perforated Oxide Nanosheets with High Density Nanopores Showing Superior Water Purification Performance

Moreno

Song

et al. 2022

ACS Appl. Mater. Interfaces

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A method for creating genuine nanopores in high area density on monolayer two-dimensional (2D) metallic oxides has been developed. By use of the strong reduction capability of hydroiodic acid, active metal ions, such as FeIII and CoIII, in 2D oxide nanosheets can be reduced to a divalent charge state (2+). The selective removal of FeO2 and CoO2 metal oxide units from the framework can be tuned to produce pores in a range of 1–4 nm. By monitoring of the redox reaction kinetics, the pore area density can be also tuned from ∼0.9 × 104 to ∼3.3 × 105 μm–2. The universality of this method to produce much smaller pores and higher area density than the previously reported ones has been proven in different oxide nanosheets. To demonstrate their potential applications, ultrasmall metal organic framework particles were grown inside the pores of perforated titania oxide nanosheets. The optimized hybrid film showed ∼100% rejection of methylene blue (MB) from the water. Its water permeance reached 4260 L m–2 h–1 bar–1, which is 1–3 orders of that for reported 2D membranes with good MB rejections.

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Section: Results and Discussionmentioning

confidence: 99%

Controlled Synthesis of Perforated Oxide Nanosheets with High Density Nanopores Showing Superior Water Purification Performance

Moreno

Song

et al. 2022

ACS Appl. Mater. Interfaces

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“…Among these membranes, the ultrathin GCN-3 membrane (53 nm) displayed a significantly high water permeance of 210 L m −2 h −1 bar −1 together with satisfactory rejection of 99.8% for NgB, surpassing most previously reported GO-based and polymeric ultrathin membranes with thickness lower than 100 nm for water purification ( Figure 4 A and Table S2 ) ( Yang et al. 2019a , 2019b ; Morelos et al., 2017 ; Xu et al., 2019 ; Wang et al., 2019b ; Nam et al., 2019 ; Liu et al., 2019 ; Soyekwo et al., 2017 ; Lin et al., 2018 ; Shen et al., 2019 ; You et al., 2019 ). To further determine the ultrafast molecular sieving properties of ultrathin nanofiltration membranes, dye molecules with different sizes and charges were used as molecular probes to characterize the selectivity owing to their easy detection, good solubility, and broad choice.…”

Section: Resultsmentioning

confidence: 82%

“…Compared with original rGO membrane without metal coordination (3.01 L m À2 h À1 bar À1 , 99.5% for NgB), single-metal-coordinated Mn/rGO nanofilms by using manganese sulfate as a precursor (107.5 L m À2 h À1 bar À1 , 99.5% for NgB), and manganese acetate as a precursor (98.7 L m À2 h À1 bar À1 , 99.7% for NgB) (Figure S4), all the prepared ultrathin Mn/N-rGO nanofilms with dual-metalcoordination exhibited significantly higher permeate flux owing to the fact that intercalation of Mn between the N-rGO layers generated large quantities of nanochannels inside membranes. Among these membranes, the ultrathin GCN-3 membrane (53 nm) displayed a significantly high water permeance of 210 L m À2 h À1 bar À1 together with satisfactory rejection of 99.8% for NgB, surpassing most previously reported GO-based and polymeric ultrathin membranes with thickness lower than 100 nm for water purification (Figure 4A and Table S2) (Yang et al 2019a(Yang et al , 2019bMorelos et al, 2017;Xu et al, 2019;Wang et al, 2019b;Nam et al, 2019;Liu et al, 2019;Soyekwo et al, 2017;Lin et al, 2018;Shen et al, 2019;You et al, 2019). To further determine the ultrafast molecular sieving properties of ultrathin nanofiltration membranes, dye molecules with different sizes and charges were used as molecular probes to characterize the selectivity owing to their easy detection, good solubility, and broad choice.…”

Section: And Discussionmentioning

confidence: 80%

Confined assembly of ultrathin nanoporous nitrogen-doped graphene nanofilms with dual metal coordination chemistry

Zhang

et al. 2021

iScience

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Summary Graphene oxide (GO) nanosheets with unique structure have received much attention in providing opportunity for high-performance membranes in separation. However, the rational design of ultrathin graphene membranes with controlled structures remains a big challenge. Here, we report a methodology to synthesize dual metal-coordinated ultrathin nanoporous graphene nanofilms by tailoring well-aligned nanocrystals as building blocks on heteroatom-doped GO nanosheets with tunable architectures. Manipulation of metal nitrate as bifunctional dopants realizes N-doping of graphene oxide and preferential growth of α-Mn 2 O 3 nanocrystals. Generation of Mn-O-C bond during cross-linking greatly strengthens the stability of membranes for long-term steady operation. Meanwhile, because of spatial confinement effects and high binding energy, N-doped reduced GO nanosheets are desirable supports to construct numerous Mn-N-C bonds, thus generating artificial nanopores to significantly increase nanochannels for ultrafast mass transport. Moreover, the size-selective permeability of ultrathin nanoporous GO-based nanofilms can be optimized by managing the types of metal source for target coordination.

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“…The vacuum/pressure-driven filtration method, used for NF and UF membranes, thoroughly disperses GO on a substrate membrane using a vacuum filtration device (Figure b) . This method is the most widely used method for the large-scale preparation of layered GO-based membranes due to its simplicity of operation, wide selection of substrate membrane materials, flat membrane formation, controlled preparation conditions, good water flux performance, and high dye rejection rate. − It can separate guest molecules via nanochannels stacked between adjacent nanosheets in a layered GO membrane …”

Section: Preparation Methods Of Go-based Membranesmentioning

confidence: 99%

Recent Advances in Graphene Oxide Membranes for Nanofiltration

Yang

Xiao

Shen

et al. 2022

ACS Appl. Nano Mater.

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Advanced membrane separation technology plays an important role in achieving excellent water treatment, which can help solve the freshwater crisis. However, there remains a trade-off between membrane permeability and selectivity. An emerging candidate to address this issue is graphene oxide (GO), a two-dimensional (2D) laminated graphene derivative with abundant oxygen functional groups. Furthermore, the transport channels of GO-based membranes can be artificially modified and manipulated, exhibiting great promise for GO in the field of water purification and molecular separation. This review comprehensively summarizes the research advances on 2D GO-based membranes for high-performance nanofiltration (NF). It begins with an elaboration on the preparation methods of GO-based membranes, followed by a detailed summary of the chemical modification and physical manipulation of transport channels. Then we reviewed the current research progress of theoretical calculation and molecular dynamics simulation. Also, the high NF performance of GO-based membranes is presented. Finally, the remaining challenges and future prospects in order to develop advances in membrane technology are provided.

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Orderly stacked ultrathin graphene oxide membranes on a macroporous tubular ceramic substrate

Cited by 33 publications

References 44 publications

Controlled Synthesis of Perforated Oxide Nanosheets with High Density Nanopores Showing Superior Water Purification Performance

Controlled Synthesis of Perforated Oxide Nanosheets with High Density Nanopores Showing Superior Water Purification Performance

Confined assembly of ultrathin nanoporous nitrogen-doped graphene nanofilms with dual metal coordination chemistry

Recent Advances in Graphene Oxide Membranes for Nanofiltration

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