Waste cigarette filter as nanofibrous membranes for on-demand immiscible oil/water mixtures and emulsions separation

Liu, Weimin; Cui, Mengke; Shen, Yongqian; Zhu, Guorong; Luo, Lan; Li, Mouji; Li, Jian

doi:10.1016/j.jcis.2019.04.057

Cited by 67 publications

(27 citation statements)

References 51 publications

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“…[ 8 ] In order to solve these problems, a variety of original oil–water separation methods emerged, which usually separate oil/water mixtures by filtration and absorption. The materials for separating oil/water mixtures by filtration principle include meshes, [ 9,10 ] membranes, [ 11,12 ] filters, [ 13,14 ] film, [ 15,16 ] and so on; the materials for separating oil/water mixtures by absorption are porous materials, [ 17,18 ] powders/particles, [ 19,20 ] gels, [ 21,22 ] nanocomposites, [ 23,24 ] and so on. [ 3 ]…”

Section: Introductionmentioning

confidence: 99%

“…[8] In order to solve these problems, a variety of original oil-water separation methods emerged, which usually separate oil/water mixtures by filtration and absorption. The materials for separating oil/water mixtures by filtration principle include meshes, [9,10] membranes, [11,12] filters, [13,14] film, [15,16] and so on; the materials for separating oil/water mixtures by absorption are porous materials, [17,18] powders/particles, [19,20] gels, [21,22] nanocomposites, [23,24] and so on. [3] The oil/water mixture can be divided into three categories according to the diameter size: free oil: the diameter of droplet is greater than 150 µm; dispersed oil: the diameter of droplet is less than 150 µm and greater than 20 µm; emulsified oil: the diameter of droplet is less than 20 µm.…”

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confidence: 99%

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Janus Membranes with Asymmetric Wettability Applied in Oil/Water Emulsion Separations

Zhang

Sun

Guo

et al. 2021

Advanced Sustainable Systems

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but these separation methods have the disadvantages of low separation efficiency, high energy consumption, complicated operation, and so on. [8] In order to solve these problems, a variety of original oil-water separation methods emerged, which usually separate oil/water mixtures by filtration and absorption. The materials for separating oil/water mixtures by filtration principle include meshes, [9,10] membranes, [11,12] filters, [13,14] film, [15,16] and so on; the materials for separating oil/water mixtures by absorption are porous materials, [17,18] powders/particles, [19,20] gels, [21,22] nanocomposites, [23,24] and so on. [3] The oil/water mixture can be divided into three categories according to the diameter size: free oil: the diameter of droplet is greater than 150 µm; dispersed oil: the diameter of droplet is less than 150 µm and greater than 20 µm; emulsified oil: the diameter of droplet is less than 20 µm. [25][26][27][28][29][30] Among them, emulsions consisting of micro-/nanoscale dispersed droplets within a continuous phase are the most difficult to separate, and the general oil/water separation method cannot effectively separate them. [31][32][33][34][35] Traditional separation methods of oil/water emulsion include thermal/chemical demulsification separation, electrochemical demulsification, centrifugation, etc. [36] However, these separation methods not only have complex operation, low separation efficiency, but also may cause secondary pollution. [4] The separation of oil/water emulsion also adopts the principle of filtration and absorption. [3] When oil/water emulsions are separated by absorption, materials with a 3D structure are often used to separate them, for example, Chen et al. [37] prepared 3D superhydrophobic foams by in situ pretreated by noncovalent surface decoration of plant polyphenol-glutaraldehyde cross-linkage that were pretreated by noncovalent surface decoration of plant polyphenolglutaraldehyde cross-linkage. Although this separation method is effective and does not clog the membrane, it cannot be reused for many times, which increases the cost. When the oil/water emulsion is separated through filtration, demulsification is usually used. Demulsification refers to the reduction of emulsion stability, resulting in immiscible phase separation, including chemical, biological, and physical treatment methods, which are commonly used in membrane separation demulsification methods including size sieving effect, charge-screening effect, With frequent oil spill accidents and the large amount of oily wastewater produced in various industrial and domestic processes, the separation of emulsified oil/water mixtures has become an important topic in environmental protection. Janus membranes with asymmetric wettability stand out among many separation materials for their switchable separation, high separation efficiency, low energy consumption, good repeatability, and durability. In recent years, Janus membranes have developed rapidly, but their separation principles and advantages and disadvan...

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Janus Membranes with Asymmetric Wettability Applied in Oil/Water Emulsion Separations

Zhang

Sun

Guo

et al. 2021

Advanced Sustainable Systems

Self Cite

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“…designed an electrospun membrane to separate oil‐water mixtures and emulsions by coating a stainless mesh using waste cigarette filters as raw material. [ 23 ] Waste polystyrene (PS) was also used by Sow et al. to fabricate superoleophilic fiber‐coated membranes for oil recovery via blow spinning, which showed a separation efficiency of up to 97%.…”

Section: Introductionmentioning

confidence: 99%

Chitosan‐Functionalized Recycled Polyethylene Terephthalate Nanofibrous Membrane for Sustainable On‐Demand Oil‐Water Separation

Baggio

Doan

et al. 2021

Global Challenges

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The preservation of marine ecosystems is one of the most severe challenges at present. In particular, oil‐water separation from oil spills and oily wastewater is important. For this reason, a low‐cost, effective, and sustainable polymeric solution is in high demand. In this work, a controlled‐wettability membrane for selective separation of oil‐water mixtures and emulsions is developed. The nanofibrous membrane is prepared via a facile and cost‐effective electrospinning technique using environmentally sustainable materials, such as recycled polyethylene terephthalate and chitosan. The effect of different concentrations of chitosan on the morphology, chemical composition, mechanical properties, wettability, and separation performance of the membrane is evaluated. The membranes exhibited underoil superhydrophobic and underwater superoleophobic behavior, which is essential to perform the selective separation. In fact, the designed filter has competitive antifouling properties (oil intrusion pressure > 45 kPa) and showed high heavy‐ and light‐oil/water separation efficiencies (>95%) both for emulsions and immiscible mixtures.

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“… 14 Meshes coated with waste cigarette filters were prepared by a facile electrospinning method, and the meshes showed remarkable underwater superoleophobicity or underoil superhydrophobicity, which can be used for the on-demand separation of various immiscible oil/water mixtures and emulsions. 21 All of the previously mentioned treatments of waste cigarette filters provide useful ways to reuse waste cigarette filters. Most of the reuse of waste cigarette filters usually focused on one aspect (morphology or chemical properties), and few studies have utilized the combination of cigarette filters’ morphology and chemical properties.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Inorganic Oxide Fiber Using a Cigarette Filter as a Template

2021

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Inorganic oxides with unique physical and chemical properties have attracted much attention because they can be applied in a wide range of fields. Herein, recycled cigarette filters are deacetylated to cellulose filters (CFs), which are then applied as templates to prepare fiber-like inorganic oxides (titanium dioxide, TiO 2 , and silicon dioxide, SiO 2 ). Inorganic oxides are prepared using CF as a template by a typical sol–gel reaction of metal alkoxides. Owing to the fibrous structure of the CF template, the prepared inorganic oxides (TiO 2 and SiO 2 ) show similar fibrous structures, which was confirmed by scanning electron microscopy and nitrogen adsorption–desorption analysis. Moreover, the prepared inorganic oxides (TiO 2 and SiO 2 ) show high surface areas and pore volumes. Furthermore, the TiO 2 fiber-like materials are evaluated for their photocatalytic properties by analyzing the methylene blue (MB) and methyl orange (MO) degradation. In this study, we provide a clean method, which can convert cellulose acetate-based waste into useful templates to prepare inorganic oxides with relatively simple steps, and the prepared inorganic oxides can be applied in water treatment.

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Waste cigarette filter as nanofibrous membranes for on-demand immiscible oil/water mixtures and emulsions separation

Cited by 67 publications

References 51 publications

Janus Membranes with Asymmetric Wettability Applied in Oil/Water Emulsion Separations

Janus Membranes with Asymmetric Wettability Applied in Oil/Water Emulsion Separations

Chitosan‐Functionalized Recycled Polyethylene Terephthalate Nanofibrous Membrane for Sustainable On‐Demand Oil‐Water Separation

Fabrication of Inorganic Oxide Fiber Using a Cigarette Filter as a Template

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