Hierarchical oil–water separation membrane using carbon fabrics decorated with carbon nanotubes

Hsieh, Chien‐Te; Hsu, Jo-Pei; Hsu, Hsiu-Hui; Lin, Wei-Hsun; Juang, Ruey‐Shin

doi:10.1016/j.surfcoat.2015.12.035

Cited by 46 publications

(8 citation statements)

References 36 publications

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“…Compared to similar studies in the literature, the membranes tested here showed very high permeability aer separation. [54][55][56][57][58] Based on the permeability and selectivity results, S5 was selected as the best candidate for the ltration of oily wastewater. The surface morphology of S5 was investigated by SEM image aer surface modication and separation test, as shown in Fig.…”

Section: Oil-water Separationmentioning

confidence: 99%

Surface modification of electrospun nanofibrous membranes for oily wastewater separation

2017

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Section: Oil-water Separationmentioning

confidence: 99%

Surface modification of electrospun nanofibrous membranes for oily wastewater separation

2017

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“…For instance, oil-water separation membranes produced using 2-(Dimethylamino)ethyl methacrylate (DMAEMA) and 4-vinylbenzyl chloride (VBC) had a separation efficiency greater than 90% 59 . Fluorinated carbon nanotubes were deposited onto carbon fabrics to create hierarchical oil-water separation membranes with 99.7% separation efficiency 60 . Titanium oxide oil-water separation membranes achieved a separation of 99.2% 61 .…”

Section: Resultsmentioning

confidence: 99%

Selective solvent filters for non-aqueous phase liquid separation from water

Marshall

Estepa

Corradini

et al. 2020

Sci Rep

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Injectable filters permeable to water but impermeable to non-polar solvents were developed to contain non-aqueous phase liquids (NAPL) in contaminated aquifers, hence protecting downstream receptors during NAPL remediation. Filters were produced by injecting aqueous solutions of 0.01% chitosan, hydroxyethylcellulose and quaternized hydroxyethylcellulose into sand columns, followed by rinsing with water. Polymer sorption onto silica was verified using a quartz-crystal microbalance with dissipation monitoring. Fluorescence and gas chromatography mass spectroscopy showed low ppm range concentrations of non-polar solvents (e.g., hexane and toluene) in water eluted from the filters (in the absence of emulsifiers). The contact angles between polymer-coated surfaces and hexane or toluene were > 90°, indicating surface oleophobicity. Organic, polar solvents (e.g. tetrahydrofuran and tetrachloroethylene, TCE) were not separated from water. The contact angles between polymercoated surfaces and TCE was also > 90°. However, the contact area with polymer coated surfaces was greater for TCE than non-polar solvents, suggesting higher affinity between TCE and the surfaces. Emulsifiers can be used to facilitate NAPL extraction from aquifers. Emulsion separation efficiency depended on the emulsifier used. Emulsions were not separated with classical surfactants (e.g. Tween 20 and oleic acid) or alkaline zein solutions. Partial emulsion separation was achieved with humic acids and zein particles. Petroleum hydrocarbons (e.g. toluene) are common soil and groundwater contaminants because of their historical and current use in industry 1. Oil spills in surface waters can also occur during transport by boat, threatening surface water bodies and ecosystems in their proximity 2-4. In 1969, the oil well blowout in Santa Barbara, California released 4.1-4.6 million barrels of oil 5,6. Since then, American waters have been contaminated by more than 44 oil spills (each over 420,000 US gallons) 7. Spills have also occurred in Greece (where the Agia Zoni II released over 2,500 tonnes of oil in 2017 8), in India (where the Ennore spill released 160 tonnes of oil 9) and in east China (where the Sanchi oil tanker released 136,000 tonnes of natural-gas condensate in 2018 10). In addition to sorbents 11,12 , separation sponges have been developed to clean-up oil spills in surface waters. Separation sponges can be attached onto suction ports on boats, to selectively extract oil from surface waters 13. Oil-water separation sponges are produced using different methods, including dip coating, chemical vapor deposition, in situ chemical reaction, wet chemical reaction, thermal treatment, polymerization, electroless deposition, or carbonization 13. Different materials have been used to produce sponges for oil-water separation. For instance, graphene/polyurethane sponges have been obtained by in situ polymerization of N-methylpyrrolidone in the presence of graphene 14. These sponges have been used to selectively extract hexane, crude oil and engine oil flo...

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“…Surface interaction is based on selective wettability through a hydrophobic/hydrophilic interaction between the surface membrane and solute (Padaki et al, 2015). A wide range of surface interaction-based membrane materials and their fabrication techniques have been intensively studied, for instance, metal mesh (Yang et al, 2019a;Zhu et al, 2020), carbon nanotube (CNT) (Hsieh et al, 2016;Saththasivam et al, 2018), graphene oxide (GO) (Wang et al, 2015a), synthetic polymers (Miao et al, 2020;Wang et al, 2020a), biopolymers-derived carbon (Yue et al, 2018a), Carbon nanofiber (Noamani et al, 2019), and biopolymer, including chitosan (Li et al, 2019a), alginate (Li et al, 2017b), and cellulose (Halim et al, 2019). The surface interaction-based membrane shows higher separation performance than conventional membrane (Wu et al, 2018, Guo et al, 2019, Yi et al, 2019.…”

Section: H I G H L I G H T Smentioning

confidence: 99%

Bioinspired cellulose-based membranes in oily wastewater treatment

Halim

Ernawati

Ismayati³

et al. 2021

Front. Environ. Sci. Eng.

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It is challenging to purify oily wastewater, which affects water-energy-food production. One promising method is membrane-based separation. This paper reviews the current research trend of applying cellulose as a membrane material that mimics one of three typical biostructures: superhydrophobic, underwater superoleophobic, and Janus surfaces. Nature has provided efficient and effective structures through the evolutionary process. This has inspired many researchers to create technologies that mimic nature’s structures or the fabrication process. Lotus leaves, fish scales, and Namib beetles are three representative structures with distinct functional and surface properties: superhydrophobic, underwater superoleophobic, and Janus surfaces. The characteristics of these structures have been widely studied and applied to membrane materials to improve their performance. One attractive membrane material is cellulose, whichhas been studied from the perspective of its biodegradability and sustainability. In this review, the principles, mechanisms, fabrication processes, and membrane performances are summarized and compared. The theory of wettability is also described to build a comprehensive understanding of the concept. Finally, future outlook is discussed to challenge the gap between laboratory and industrial applications.

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Hierarchical oil–water separation membrane using carbon fabrics decorated with carbon nanotubes

Cited by 46 publications

References 36 publications

Surface modification of electrospun nanofibrous membranes for oily wastewater separation

Surface modification of electrospun nanofibrous membranes for oily wastewater separation

Selective solvent filters for non-aqueous phase liquid separation from water

Bioinspired cellulose-based membranes in oily wastewater treatment

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