Zero internal concentration polarization FO membrane: functionalized graphene

Gai, Jing‐Gang; Gong, Xiaolei

doi:10.1039/c3ta13562d

Cited by 70 publications

(39 citation statements)

References 57 publications

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“…If there are used graphenes with atomic vacancies (pores in the graphene structure), the flux increase dramatically (1.7 × 10 3 times higher) because of the decrease of internal concentration polarization. [13] Bovine serum albumin rejection…”

Section: Fluxesmentioning

confidence: 99%

“…[11,12] Within their studies, GO with atomic vacancies (pores of 9.4 Å diameter, porosity 10%) exhibits water flux of 91.5 l/cm 2 day, 1.7 × 10 3 times higher compared with the typical AC forward osmosis membrane. [13] Using functionalized GO with pore diameters around 11.7 Å, the water flux reached 28.1 l cm À2 h À1 ,which is about 1.8 × 10 4 times higher than that of the commercial AC membrane. [14] Nevertheless, there are unrevealed aspects concerning AC/GO composite materials in conjunction with phase inversion methods for the development of new polymer membranes.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of cellulose triacetate/graphene oxide porous membrane

Ioniță

Crică

Voicu

et al. 2015

Polym. Adv. Technol.

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Cellulose triacetate (AC)/graphene oxide (GO) porous membranes were successfully fabricated by combining ultrasonication and phase inversion method. The structures and morphologies of the resultant composite membranes were investigated by X-ray diffraction (XRD), scanning electron microscopy, and transmission electron microscopy, respectively. Microscopic and X-ray diffraction measurements revealed that GO sheets were uniformly dispersed within the AC matrix. The pore size and structure were modulated by changing GO concentration from 0.25 to 1 wt%. Membrane thermal properties were also studied. Among all tested membranes, the most favorable GO amount was 1 wt%, giving Td 3% of 274°C, which represents a 22°C enhancement compared with AC. Conversely, the membranes showed improved barrier properties against water and ethanol. The decrease of both ethanol and water fluxes was assigned to the stabilization of composite membrane structure, as a result of GO progressive addition. Bovine serum albumin rejection assay indicated an increasing from 78% in the case of CA membrane to 99% in the case of CA/GO 1 wt% of the rejection degree after 90 min.

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Section: Fluxesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of cellulose triacetate/graphene oxide porous membrane

Ioniță

Crică

Voicu

et al. 2015

Polym. Adv. Technol.

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“…Recent work also mentioned the layer-by-layer approach (LbL) that allows formulating tailor-made membranes [ 76 , 77 , 78 , 79 ]. In addition, several publications referred to next generations of biomimetic FO membranes using Aquaporin Z [ 80 , 81 ], carbon nanotubes (CNT) [ 82 , 83 ] or graphene [ 84 ].…”

Section: Recent Development To Improve Flux In Fomentioning

confidence: 99%

Efficiently Combining Water Reuse and Desalination through Forward Osmosis—Reverse Osmosis (FO-RO) Hybrids: A Critical Review

et al. 2016

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Forward osmosis (FO) is a promising membrane technology to combine seawater desalination and water reuse. More specifically, in a FO-reverse osmosis (RO) hybrid process, high quality water recovered from the wastewater stream is used to dilute seawater before RO treatment. As such, lower desalination energy needs and/or water augmentation can be obtained while delivering safe water for direct potable reuse thanks to the double dense membrane barrier protection. Typically, FO-RO hybrid can be a credible alternative to new desalination facilities or to implementation of stand-alone water reuse schemes. However, apart from the societal (public perception of water reuse for potable application) and water management challenges (proximity of wastewater and desalination plants), FO-RO hybrid has to overcome technical limitation such as low FO permeation flux to become economically attractive. Recent developments (i.e., improved FO membranes, use of pressure assisted osmosis, PAO) demonstrated significant improvement in water flux. However, flux improvement is associated with drawbacks, such as increased fouling behaviour, lower rejection of trace organic compounds (TrOCs) in PAO operation, and limitation in FO membrane mechanical resistance, which need to be better considered. To support successful implementation of FO-RO hybrid in the industry, further work is required regarding up-scaling to apprehend full-scale challenges in term of mass transfer limitation, pressure drop, fouling and cleaning strategies on a module scale. In addition, refined economics assessment is expected to integrate fouling and other maintenance costs/savings of the FO/PAO-RO hybrid systems, as well as cost savings from any treatment step avoided in the water recycling.

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“…Several researchers have investigated the use of symmetric FO membranes in which the support layer is eliminated completely, resulting in no internal concentration polarization [110]. Porous single layer graphene oxide membranes also exhibited zero internal concentration polarization and high water flux (three times higher than cellulose triacetate FO membrane) [111]. However, thin membranes exhibit low mechanical strength and may require frequent replacement in the event of damage.…”

Section: Other Factors Limiting Membrane Performancementioning

confidence: 99%

A Review of Fouling Mechanisms, Control Strategies and Real-Time Fouling Monitoring Techniques in Forward Osmosis

Ibrar

Naji

Sharif

et al. 2019

Water

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Forward osmosis has gained tremendous attention in the field of desalination and wastewater treatment. However, membrane fouling is an inevitable issue. Membrane fouling leads to flux decline, can cause operational problems and can result in negative consequences that can damage the membrane. Hereby, we attempt to review the different types of fouling in forward osmosis, cleaning and control strategies for fouling mitigation, and the impact of membrane hydrophilicity, charge and morphology on fouling. The fundamentals of biofouling, organic, colloidal and inorganic fouling are discussed with a focus on recent studies. We also review some of the in-situ real-time online fouling monitoring technologies for real-time fouling monitoring that can be applicable to future research on forward osmosis fouling studies. A brief discussion on critical flux and the coupled effects of fouling and concentration polarization is also provided.

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Zero internal concentration polarization FO membrane: functionalized graphene

Cited by 70 publications

References 57 publications

Fabrication of cellulose triacetate/graphene oxide porous membrane

Fabrication of cellulose triacetate/graphene oxide porous membrane

Efficiently Combining Water Reuse and Desalination through Forward Osmosis—Reverse Osmosis (FO-RO) Hybrids: A Critical Review

A Review of Fouling Mechanisms, Control Strategies and Real-Time Fouling Monitoring Techniques in Forward Osmosis

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