Hierarchically Assembled Graphene Oxide Composite Membrane with Self-Healing and High-Efficiency Water Purification Performance

Chang, Ran; Ma, Shiyue; Guo, Xiuyan; Xu, Jin-Quan; Zhong, Chongli; Huang, Rong; Ma, Jing

doi:10.1021/acsami.9b18018

Cited by 56 publications

(29 citation statements)

References 39 publications

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“…To avoid this, Chang et al prepared hierarchically assembled GO‐MOF composite membranes to achieve better results. [ 49 ] Growing polymer chains from the single GO layers affect the orientation of graphene nanoparticles significantly during the membrane preparation, and it helps to reduce the thickness of the selective layer below 100 nm as a consequence of increasing membrane performance by a factor of at least 4 compared to the membrane under study.…”

Section: Resultsmentioning

confidence: 99%

SI‐ATRP Polymer‐Functionalized Graphene Oxide for Water Vapor Separation

Aliyev

Shishatskiy

Abetz

et al. 2020

Adv Materials Inter

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considerable attention since 1980. [5] Despite the significant attention paid to the improvement of properties, most of the polymers studied did not exceed the Robeson upper bound, and none of them found use in the efficient separation system. [6] To obtain higher permeability and better selectivity, several approaches have been implemented, such as thermal rearrangement of the polymers, [7] formation of mixed matrix membranes (MMMs) by incorporation of metal-organic frameworks (MOFs), [8] covalent organic frameworks (COFs), [9] and other fillers into the polymer matrix. Every year, the drinking water demand increases, and thus energy-efficient water separation becomes more and more significant in terms of safe water supply in the world. Since we need to supply the world population with drinkable water from salty ocean, seas, and brackish water, water needs to be separated from its constituents such as salts, organic compounds, and bacteria. The primary membrane separation methods used widely for this purpose are forward osmosis (FO), reverse osmosis (RO), ultrafiltration (UF), nanofiltration (NF), microfiltration (MF), and electrodialysis reversal desalination (ERD). As a robust and low-energy-consuming technique, membrane distillation (MD) has recently received extensive attention. For this purpose, hydrophobic microporous polymeric membranes based on polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polypropylene (PP), etc., are implemented. In MD, a hot water stream circulates on the surface of the hydrophobic membrane, while only water vapor can pass through the porous structure of the membrane. The separated water vapor afterwards condenses on cold surfaces. Lee et al. reported that an electrospun perfluorooctyltriethoxysilane-coated titanium dioxide/polyvinylidene fluoride-co-hexafluoropropylene (F-TiO 2 /PVDF-HFP) membrane showed superhydrophobicity and a high water flux of 40 L m −2 h −1 compared to pristine PVDF membranes, [10] while the water flux of the PVDF nanofibrous hydrophobic membranes reinforced with fabric substrate was 49 kg m −2 h −1. [11] Being a 2D material, graphene oxide (GO) has attracted extensive attention in membrane science as a potential material due to its mechanical strength, [12] the possibility for property alteration by covalent and noncovalent chemical bonding, [13] and its cost-effective production. Recent works [14] show how GO incorporation affects the selectivity of polyimide-and Graphene oxide is functionalized with poly(2-diethylaminoethyl) methacrylate (PDEAEMA), and the resulting material is used as a selective layer of a thin-film composite membrane (TFCM). The polymer synthesis is carried out by surfaceinitiated atom transfer radical polymerization (SI-ATRP) from bulk and also from single-layer graphene oxide (GO). The polymer brushes synthesized by the "grafting from" method are characterized by size exclusion chromatography (SEC), nuclear magnetic resonance spectroscopy (NMR), Fourier-transform infrared (FTIR) spectroscopy, thermal gravimetric analys...

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Section: Resultsmentioning

confidence: 99%

SI‐ATRP Polymer‐Functionalized Graphene Oxide for Water Vapor Separation

Aliyev

Shishatskiy

Abetz

et al. 2020

Adv Materials Inter

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“…The intercalated MOF can also provide the GO channels with molecular-sieving properties. Using this strategy, Chang et al [221] prepared a GO/CS/MOF membrane for the purification of water. The GO/CS/MOF membrane exhibited very good water flux (14.62 L m −2 h −1 bar −1 ), with high rejection (>99% for dyes) and good antifouling characteristics.…”

Section: Go/chitosan Combined With Other Adsorbent Materialsmentioning

confidence: 99%

Graphene-Based Materials Immobilized within Chitosan: Applications as Adsorbents for the Removal of Aquatic Pollutants

et al. 2021

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Graphene and its derivatives, especially graphene oxide (GO), are attracting considerable interest in the fabrication of new adsorbents that have the potential to remove various pollutants that have escaped into the aquatic environment. Herein, the development of GO/chitosan (GO/CS) composites as adsorbent materials is described and reviewed. This combination is interesting as the addition of graphene to chitosan enhances its mechanical properties, while the chitosan hydrogel serves as an immobilization matrix for graphene. Following a brief description of both graphene and chitosan as independent adsorbent materials, the emerging GO/CS composites are introduced. The additional materials that have been added to the GO/CS composites, including magnetic iron oxides, chelating agents, cyclodextrins, additional adsorbents and polymeric blends, are then described and discussed. The performance of these materials in the removal of heavy metal ions, dyes and other organic molecules are discussed followed by the introduction of strategies employed in the regeneration of the GO/CS adsorbents. It is clear that, while some challenges exist, including cost, regeneration and selectivity in the adsorption process, the GO/CS composites are emerging as promising adsorbent materials.

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“…Another type of the composite membranes is based on as electivel ayer with more precise, consistent, and well-defined channels. Owing to intrinsic ordered structure or inherentp orosity,t he studyo fs everalm aterials has flourished, including graphene oxide (GO), [22,52] MOFs, [34] COFs, [35] zeolites, [21] PIMs, [36] PAFs, [37] and POCs. [38] In this type, the aforementioned materials are fabricated on the support layer,a sd emonstrated in Figure 4c.A dvantages are prominent when the ordereds tructure materials are constructed as selectivel ayers.…”

Section: Ordered Framework Selectivelayermentioning

confidence: 99%

“…GO composite membranes possess flexibility and specific tunable lamella structure . As materials can be intercalated between the lamella of GO, GO can provide variable functions and a high number of mass‐transport channels without damaging the compact structure of membranes . MOF composite membranes with high crystallinity and regular pores structure can be functionalized more flexibly via introducing functional organic linkers or by post‐synthetic modification (PSM) .…”

Section: Types Of Composite Membranesmentioning

confidence: 99%