Water desalination using graphene-enhanced electrospun nanofiber membrane via air gap membrane distillation

Woo, Yun Chul; Tijing, Leonard D.; Shim, Wang Geun; Choi, June-Seok; Kim, Seung Hyun; He, Tianhu; Drioli, Enrico; Shon, Ho Kyong

doi:10.1016/j.memsci.2016.07.049

Cited by 186 publications

(56 citation statements)

References 48 publications

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“…via spray, vacuum filtering or the Langmuir-Blodgett method. GO membranes can only exist as a free-standing C-frame deposited either onto a different membrane and functionally connected with a polymer or modified into an "in situ" polymer matrix, creating a non-covalent or covalent composite connection [2][3][4][5], or onto a porous material [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Laminated, Composite and Sandwich Membranes Based on Graphene-Oxide with Nano-Textiles

Roupcová¹,

Klouda²,

Gembalová³

et al. 2018

J Nanomed Nanotechnol

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The results of gas and ion separation are influenced by diffusion speed [18], layer investing [19], spacing between nano-particles of GO providing channels (Figure 1), gap size between the layers. The functional groups also expand separation abilities and possibilities. Examples of selective separation AbstractThe contribution describes preparation of graphene-oxide suspensions and their hybrid compounds, GO-biochar, GO-C 60 , GO-CF 0.9 , which are subsequently applied to nano-textiles using various techniques. This method was used to prepare composite and sandwich-type films or laminated nano-textiles. Relative arrangement in product (film) crosssections was identified in products prepared using SEM analysis. Thermal stability of the products was determined using DTA, DSC analysis and compared to the stability of the nano-textiles. Chemical properties of graphene-oxide (GO) allow a number of its modifications, partial reduction, creation of composites with metals and their oxides. Preparation and thermal analysis GO-TiO 2 / PCl /GO-TiO 2 has been described as an example. The conclusion of the project suggests possible application of the products (films). Figure 1: The porous membrane and the graphene stacked arrangement of G0 membrane.Figure 2: a) lamination and nanotextiles, b) composite.Figure 13: TGA and DSC analysis of PCL (polycaprolactone).Figure 12: TGA and DSC analysis of PA6 (polyamide 6).

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Section: Introductionmentioning

confidence: 99%

Laminated, Composite and Sandwich Membranes Based on Graphene-Oxide with Nano-Textiles

Roupcová¹,

Klouda²,

Gembalová³

et al. 2018

J Nanomed Nanotechnol

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“…Membrane distillation (MD) is an emerging non-isothermal membrane separation process, being one of the promising techniques for the desalination of highly saline waters [1][2][3][4][5][6][7]. Contrary to pressure-driven techniques, the driving force in the membrane distillation process is related to the difference in chemical potential (generated by difference of temperatures) between the two sides of the hydrophobic membrane [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…The non-wetted porous hydrophobic membranes are required for an efficient process realization. There are various MD modes utilized, for example, sweep gas membrane distillation (SGMD), direct contact membrane distillation (DCMD), air gap membrane distillation (AGMD), vacuum membrane distillation (VMD) [1,5,9,11]. MD can be used in different applications such as waste water treatment, desalination, and food processing [1,3,5,[11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…In all configurations, the liquid-vapor equilibrium is the determining factor yielding to the selectivity of the MD processes. The mass transfer in MD follows three subsequent steps: liquid-vapor phase transition at the membrane pores entrance on feed side; transfer of vapors through the pores of the membrane; and condensation of vapors on the permeate side of the membrane [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Hydrophobic Ceramic Membranes for Water Desalination

et al. 2017

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Hydrophilic ceramic membranes (tubular and planar) made of TiO 2 and Al 2 O 3 were efficiently modified with non-fluorinated hydrophobic grafting molecules. As a result of condensation reaction between hydroxyl groups on the membrane and reactive groups of modifiers, the hydrophobic surfaces were obtained. Ceramic materials were chemically modified using three various non-fluorinated grafting agents. In the present work, the influence of grafting time and type of grafting molecule on the modification efficiency was evaluated. The changes of physicochemical properties of obtained hydrophobic surfaces were determined by measuring the contact angle (CA), roughness (RMS), and surface free energy (SFE). The modified surfaces were characterized by contact angle in the range of 111-132 • . Moreover, hydrophobic tubular membranes were utilized in air-gap membrane distillation to desalination of sodium chloride aqueous solutions. The observed permeate fluxes were in the range of 0.7-4.8 kg·m −2 ·h −1 for tests with pure water. The values of permeate fluxes for membranes in contact with NaCl solutions were smaller, within the range of 0.4-2.8 kg·m −2 ·h −1 . The retention of NaCl in AGMD process using hydrophobized ceramic membranes was close to unity for all investigated membranes.

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“…Nanofibers fabricated by electrospinning provide a rough surface this way, increasing hydrophobicity, an ideal property in capacitive humidity sensors [19,20]. In the electrospinning process, a high voltage induces a charged jet of a polymer solution; this elongated jet is moved toward a collector plate where fibers are randomly deposited.…”

Section: Introductionmentioning

confidence: 99%

A Capacitive Humidity Sensor Based on an Electrospun PVDF/Graphene Membrane

Hernández-Rivera

Rodríguez-Roldán

Mora-Martínez

et al. 2017

Sensors

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Humidity sensors have been widely used in areas such as agriculture, environmental conservation, medicine, instrumentation and climatology. Hydrophobicity is one of the important factors in capacitive humidity sensors: recent research has shown that the inclusion of graphene (G) in polyvinylidene fluoride (PVDF) improves its hydrophobicity. In this context, a methodology to fabricate electrospun membranes of PVDF blended with G was developed in order to improve the PVDF properties allowing the use of PVDF/G membrane as a capacitive humidity sensor. Micrographs of membranes were obtained by scanning electron microscopy to analyze the morphology of the fabricated samples. Subsequently, the capacitive response of the membrane, which showed an almost linear and directly proportional response to humidity, was tested. Results showed that the response time of PVDF/G membrane was faster than that of a commercial DHT11 sensor. In summary, PVDF/G membranes exhibit interesting properties as humidity sensors.

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Water desalination using graphene-enhanced electrospun nanofiber membrane via air gap membrane distillation

Cited by 186 publications

References 48 publications

Laminated, Composite and Sandwich Membranes Based on Graphene-Oxide with Nano-Textiles

Laminated, Composite and Sandwich Membranes Based on Graphene-Oxide with Nano-Textiles

Hydrophobic Ceramic Membranes for Water Desalination

A Capacitive Humidity Sensor Based on an Electrospun PVDF/Graphene Membrane

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