Electrospinning nanofibers and nanomembranes for oil/water separation

The discharge of oily wastewater and oil spills at sea are the current difficulties in water pollution control. This problem often leads to terrible disasters. Therefore, the effective realization of oil-water separation is a very challenging problem. Superhydrophobic sponge is a promising oil-absorbing material. In this article, we reported a superhydrophobic sponge with nano-Fe3O4 for oil-water separation. The addition of nano-Fe3O4 allows the sponge to be recycled under the action of magnetic force. The sponge has the advantages of low cost, simple preparation and efficient oil-water separation. This kind of sponge is very worthy of promotion for the treatment of oily wastewater and marine oil spill accidents.

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Oil Water Separation: Bioinspired, Mechano-Regulated Interfaces for Rationally Designed, Dynamically Controlled Collection of Oil Spills from Water (Global Challenges 3/2017)

Global Challenges ◽

10.1002/gch2.201770011 ◽

2017 ◽

Vol 1 (3) ◽

Author(s):

Yaoyao Li ◽

Deyong Zhu ◽

Stephan Handschuh-Wang ◽

Guanghui Lv ◽

Jiahui Wang ◽

...

Keyword(s):

Oil Spills ◽

Water Separation ◽

Global Challenges ◽

Oil Water Separation ◽

Oil Water

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Fabrication of silica/PVA-co-PE nanofiber membrane for oil/water separation

Fashion and Textiles ◽

10.1186/s40691-021-00252-x ◽

2021 ◽

Vol 8 (1) ◽

Author(s):

Yuanli Chen ◽

Hui Fan ◽

Xinlin Zha ◽

Wenwen Wang ◽

Yi Wu ◽

...

Keyword(s):

High Efficiency ◽

Silicone Oil ◽

Hydroxyl Groups ◽

Water Mixture ◽

Silica Nanospheres ◽

Nanofiber Membrane ◽

Water Separation ◽

Oil Water Separation ◽

Silica Nanostructures ◽

Oil Water

AbstractHigh efficiency and anti-pollution oil/water separation membrane has been widely explored and researched. There are a large number of hydroxyl groups on the surface of silica, which has good wettability and can be used for oil-water separation membranes. Hydrophilic silica nanostructures with different morphologies were synthesized by changing templates and contents of trimethylbenzene (TMB). Here, silica nanospheres with radical pores, hollow silica nanospheres and worm-like silica nanotubes were separately sprayed on the PVA-co-PE nanofiber membrane (PM). The abundance of hydroxyl groups and porous structures on PM surfaces enabled the absorption of silica nanospheres through hydrogen bonds. Compared with different silica nanostructures, it was found that the silica/PM exhibited excellent super-hydrophilicity in air and underwater “oil-hating” properties. The PM was mass-produced in our lab through melt-extrusion-phase-separation technique. Therefore, the obtained membranes not only have excellent underwater superoleophobicity but also have a low-cost production. The prepared silica/PM composites were used to separate n-hexane/water, silicone oil/water and peanut oil water mixtures via filtration. As a result, they all exhibited efficient separation of oil/water mixture through gravity-driven filtration.

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Fabrication of hydrophobic NiFe2O4@poly(DVB-LMA) sponge via Pickering emulsion template method for oil/water separation

Soft Matter ◽

10.1039/d0sm01902j ◽

2021 ◽

Author(s):

Caimei Zhao ◽

Lei Chen ◽

Chuanming Yu ◽

Binghua Hu ◽

Haoxuan Huang ◽

...

Keyword(s):

Oil Spills ◽

Low Cost ◽

Pickering Emulsion ◽

Template Method ◽

Water Separation ◽

Environment Friendly ◽

Oil Water Separation ◽

Oil Water ◽

Cost Efficient

Super-hydrophobic porous absorbent is a convenient, low-cost, efficient and environment-friendly material in the treatment of oil spills. In this work, a simple Pickering emulsion template method was employed to fabricate...

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Chelation Assembly of Cellulose Nanohydrogel onto Flower-Like Structured Foam with Underwater Superoleophobicity for Highly Efficient Oil–Water Separation

NANO ◽

10.1142/s1793292021500612 ◽

2021 ◽

pp. 2150061

Author(s):

Yuntian Wan ◽

Xue Lin ◽

Zhongshuai Chang ◽

Xiaohui Dai ◽

Jiangdong Dai

Keyword(s):

Water Flux ◽

Separation Performance ◽

Layer By Layer ◽

Potential Candidate ◽

Oily Wastewater ◽

Water Separation ◽

Composite Foam ◽

Oil Water Separation ◽

Oil Water ◽

Underwater Superoleophobicity

Currently, with the increasingly serious pollution problem of oily wastewater, it is urgent to develop advanced materials and methods. In this work, a Fe(III)-CMC@Ni(OH)2@Ni composite foam with superhydrophilic and underwater superoleophobicity was fabricated by an in situ growth of flower-like Ni(OH)2 nanoparticles and chelated assembly of Fe(III)-CMC nanohydrogel via a layer-by-layer self assembly using Fe[Formula: see text] ion and carboxymethyl cellulose (CMC). The composite foam could separate various oil/water mixtures and exhibited excellent efficiency over 99%. This foam possessed ultrahigh water flux (220000[Formula: see text]L m[Formula: see text] h[Formula: see text] and better resistant to penetration pressure (1.3[Formula: see text]kPa). After 30 cycles, the oil–water separation performance reduced only 0.5%, but the foam structure was still stable that guarantees a better lifetime. Besides, this composite foam showed anti-fouling, unique durability and excellent corrosion resistance performance. Taking into account all good properties, Fe(III)-CMC@Ni(OH)2@Ni composite foam was expected to be a potential candidate for responding to all kinds of complex oily wastewater conditions.

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Surface Engineering of Ceramic Nanomaterials for Separation of Oil/Water Mixtures

Frontiers in Chemistry ◽

10.3389/fchem.2020.00578 ◽

2020 ◽

Vol 8 ◽

Author(s):

Usama Zulfiqar ◽

Andrew G. Thomas ◽

Allan Matthews ◽

David J. Lewis

Keyword(s):

Surface Engineering ◽

Oil Spills ◽

Chemical Interaction ◽

Low Cost ◽

Water Mixture ◽

Water Separation ◽

Manufacturing Operations ◽

Industrial Oil ◽

Oil Water Separation ◽

Oil Water

Oil/water mixtures are a potentially major source of environmental pollution if efficient separation technology is not employed during processing. A large volume of oil/water mixtures is produced via many manufacturing operations in food, petrochemical, mining, and metal industries and can be exposed to water sources on a regular basis. To date, several techniques are used in practice to deal with industrial oil/water mixtures and oil spills such as in situ burning of oil, bioremediation, and solidifiers, which change the physical shape of oil as a result of chemical interaction. Physical separation of oil/water mixtures is in industrial practice; however, the existing technologies to do so often require either dissipation of large amounts of energy (such as in cyclones and hydrocyclones) or large residence times or inventories of fluids (such as in decanters). Recently, materials with selective wettability have gained attention for application in separation of oil/water mixtures and surfactant stabilized emulsions. For example, a superhydrophobic material is selectively wettable toward oil while having a poor affinity for the aqueous phase; therefore, a superhydrophobic porous material can easily adsorb the oil while completely rejecting the water from an oil/water mixture, thus physically separating the two components. The ease of separation, low cost, and low-energy requirements are some of the other advantages offered by these materials over existing practices of oil/water separation. The present review aims to focus on the surface engineering aspects to achieve selectively wettability in materials and its their relationship with the separation of oil/water mixtures with particular focus on emulsions, on factors contributing to their stability, and on how wettability can be helpful in their separation. Finally, the challenges in application of superwettable materials will be highlighted, and potential solutions to improve the application of these materials will be put forward.

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2D and 3D Bulk Materials for Environmental Remediation: Air Filtration and Oil/Water Separation

Materials ◽

10.3390/ma13245714 ◽

2020 ◽

Vol 13 (24) ◽

pp. 5714

Author(s):

Ha-Jin Lee ◽

Won San Choi

Keyword(s):

Future Research ◽

Oily Wastewater ◽

Air Filtration ◽

Bulk Materials ◽

Water Separation ◽

Air Filters ◽

Technical Problems ◽

Oil Water Separation ◽

Oil Water ◽

2D And 3D

Air and water pollution pose an enormous threat to human health and ecosystems. In particular, particulate matter (PM) and oily wastewater can cause serious environmental and health concerns. Thus, controlling PM and oily wastewater has been a great challenge. Various techniques have been reported to effectively remove PM particles and purify oily wastewater. In this article, we provide a review of the recent advancements in air filtration and oil/water separation using two- and three-dimensional (2D and 3D) bulk materials. Our review covers the advantages, characteristics, limitations, and challenges of air filters and oil/water separators using 2D and 3D bulk materials. In each section, we present representative works in detail and describe the concepts, backgrounds, employed materials, fabrication methods, and characteristics of 2D and 3D bulk material-based air filters and oil/water separators. Finally, the challenges, technical problems, and future research directions are briefly discussed for each section.

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Synthesis of graphene oxide–SiO2 coated mesh film and its properties on oil–water separation and antibacterial activity

Water Science & Technology ◽

10.2166/wst.2015.584 ◽

2015 ◽

Vol 73 (5) ◽

pp. 1098-1103 ◽

Cited By ~ 10

Author(s):

Jun Liu ◽

Wanxia He ◽

Peng Li ◽

Siying Xia ◽

Xiaomeng Lü ◽

...

Keyword(s):

Graphene Oxide ◽

Environmental Stability ◽

Layer By Layer ◽

Oily Wastewater ◽

Separation System ◽

Water Separation ◽

Silica Coatings ◽

Oil Water Separation ◽

Oil Water ◽

Harsh Conditions

Oil–water separation has recently become a worldwide challenge due to the frequent occurrence of oil spill accidents and increasing industrial oily wastewater. In this work, the multifunctional mesh films with underwater oleophobicity and certain bacteriostatic effects are prepared by layer-by-layer assembly of graphene oxide-silica coatings on stainless steel mesh. The mesh film exhibits excellent environmental stability under a series of harsh conditions. The new, facile and reusable separation system is proposed to achieve deep treatment of oily wastewater, and the oil collection rate can reach over 99%.

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