Stable superhydrophobic and superoleophilic silica coated polyurethane sponges for the continuous capture and removal of oils from the water surface

Li, Jian; Li, Dianming; Hu, Wenfang; Li, Jianping; Yang, Yaoxia; Wu, Yanxia

doi:10.1039/c5nj01565k

Cited by 47 publications

(11 citation statements)

References 39 publications

(40 reference statements)

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“…Recently, superhydrophobic/superoleophilic 3D sponges have received considerable attention due to their rapid absorption and highly efficient removal of oils and organic solvents from polluted water, especially in an oil spill situation . Niu et al prepared reduced graphene oxide foams showing extremely high oil absorption capability .…”

Section: Introductionmentioning

confidence: 99%

Robust Superhydrophobic Fabric Bag Filled with Polyurethane Sponges Used for Vacuum‐Assisted Continuous and Ultrafast Absorption and Collection of Oils from Water

Liu

Tang

et al. 2016

Adv Materials Inter

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195

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crude oil that greatly harmed the coastline and near-shore water, killing huge populations of marine animals and plants.Various methods have been applied in oil spill cleanup such as mechanical collection, controllable burn, and chemical decomposition. [3][4][5] However, those techniques are time-consuming, environment unfriendly, and expensive. Recently, researchers prefer to design and fabricate functional membrane materials and adsorbents with special wettability for oil/ water separation, protecting environment from secondary pollution and reducing the loss. [6][7][8][9] Jiang and co-workers, for the fi rst time, fabricated a mesh fi lm possessing both superhydrophobic and superoleophilic properties to separate oil from water, exhibiting high oil/water separation effi ciency and selectivity. [ 10 ] Subsequently, abundant materials with both superhydrophobic and superoleophilic properties are generally applied to removal of oil from water, [11][12][13][14][15][16][17][18][19][20] such as metallic mesh-based materials, [21][22][23] sponges and foam-based materials, [24][25][26] ceramic microfi ltration membranes, [ 27 ] carbon-based materials, [ 28,29 ] oil-absorptive rubber, [ 30 ] fabrics, [31][32][33] etc. In general, these materials were obtained by roughening of their surfaces and posthydrophobization. Various approaches have been used to construct hierarchical rough structures needed for superhydrophobicity, such as a sol-gel method, [ 34 ] chemical vapor deposition, [ 35 ] hydrothermal method, [ 36 ] electrochemical method, [ 37 ] spray method, [ 38,39 ] and so forth. Nevertheless, most of the methods involved in fabricating superhydrophobic surfaces have limitations for large-scale fabrication, due to complicated processes, sophisticated equipment, and low commercial availability of raw materials. In addition, the traditional fi lterable materials cannot easily be applied in oil spills, because they need to gather polluted water fi rst and then fi lter it. Therefore, it is imperative to fi nd high-performance absorbent materials for the removal of large amounts of oil pollutant from the water surface.Recently, superhydrophobic/superoleophilic 3D sponges have received considerable attention due to their rapid absorption Removal of oil from water has become an increasingly important fi eld due to the frequent oil spill accidents as well as industrial oily wastewater. In this study, a bag is made from superhydrophobic fabric and stuffed with pristine polyurethane (PU) sponge just utilizing the synergetic effect of the superhydrophobic and superoleophilic selective absorption of oil from water of the fabric and the excellent large volume-based oil storage capacity of the PU sponge. The superhydrophobic fi lling bag can quickly absorb and collect a large amount of oil from a polluted water surface with the separation effi ciency always above 98.2% % for a series of oil/water mixtures. In addition, the fi lled orignial sponges exhibit large volume-based absorption capacity up to 20-36 times its own weight, ke...

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Section: Introductionmentioning

confidence: 99%

Robust Superhydrophobic Fabric Bag Filled with Polyurethane Sponges Used for Vacuum‐Assisted Continuous and Ultrafast Absorption and Collection of Oils from Water

Liu

Tang

et al. 2016

Adv Materials Inter

Self Cite

195

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show abstract

“…The treatment of PU foams by nanomaterials to attain superhydrophobicity was done via different methods. Li and his team [ 64 ] coated PU foam with SiO 2 nanoparticles physically to prepare a hydrophobic foam that absorb oil up to 55.8 its own weight with a contact angle of 130°. The topography of the modified foam showed a porous structure of 100–400 μm, the foam’s fibers become rougher and close packed with silica NPs as shown in Figure 8 .…”

Section: Characterizations Of the Foamsmentioning

confidence: 99%

The Separation of Oil/Water Mixtures by Modified Melamine and Polyurethane Foams: A Review

Hailan¹,

Ponnamma²,

Krupa³

2021

Polymers

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Melamine (MA) and polyurethane (PU) foams, including both commercial sponges for daily use as well as newly synthesized foams are known for their high sorption ability of both polar and unipolar liquids. From this reason, commercial sponges are widely used for cleaning as they absorb a large amount of water, oil as well as their mixtures. These sponges do not preferentially absorb any of those components due to their balanced wettability. On the other hand, chemical and physical modifications of outer surfaces or in the bulk of the foams can significantly change their original wettability. These treatments ensure a suitable wettability of foams needed for an efficient water/oil or oil/water separation. MA and PU foams, dependently on the treatment, can be designed for both types of separations. The particular focus of this review is dealt with the separation of oil contaminants dispersed in water of various composition, however, an opposite case, namely a separation of water content from continuous oily phase is also discussed in some extent. In the former case, water is dominant, continuous phase and oil is dispersed within it at various concentrations, dependently on the source of polluted water. For example, waste waters associated with a crude oil, gas, shale gas extraction and oil refineries consist of oily impurities in the range from tens to thousands ppm [mg/L]. The efficient materials for preferential oil sorption should display significantly high hydrophobicity and oleophilicity and vice versa. This review is dealt with the various modifications of MA and PU foams for separating both oil in water and water in oil mixtures by identifying the chemical composition, porosity, morphology, and crosslinking parameters of the materials. Different functionalization strategies and modifications including the surface grafting with various functional species or by adding various nanomaterials in manipulating the surface properties and wettability are thoroughly reviewed. Despite the laboratory tests proved a multiply reuse of the foams, industrial applications are limited due to fouling problems, longer cleaning protocols and mechanical damages during performance cycles. Various strategies were proposed to resolve those bottlenecks, and they are also reviewed in this study.

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“…In this review, we called all these methods as dip-coating methods. [58][59][60][61][62][63][64][65][66][67] Dip-coating method is a simple and convenient method in the modi¯cation of PU foams for oil/water separation. First of all, nanoparticles are used to increase the surface roughness in the preparation of PU-based materials for oil/water separation.…”

Section: Physical Modi¯cation By Dip-coating Methodsmentioning

confidence: 99%

Recent Progress of Polyurethane-Based Materials for Oil/Water Separation

Guo

Liu

Dang

et al. 2017

NANO

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With the development of society, oil pollution has become more and more serious, it is becoming a global issue to separate oil and water mixture. Currently, a variety of functional materials have been successfully prepared for oil/water separation. Among them, polyurethane is an attractive candidate due to its low cost, wear-resistance and excellent mechanical properties. This report summarizes the design strategy of polyurethane-based materials and their applications in oil/ water separation. The progress made so far will guide further development of polyurethane-based materials for oil/water separation.

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Stable superhydrophobic and superoleophilic silica coated polyurethane sponges for the continuous capture and removal of oils from the water surface

Abstract: Robust superhydrophobic silica coated polyurethane sponges can be used for the continuous removal of oils from the water surface.

Cited by 47 publications

References 39 publications

Robust Superhydrophobic Fabric Bag Filled with Polyurethane Sponges Used for Vacuum‐Assisted Continuous and Ultrafast Absorption and Collection of Oils from Water

Robust Superhydrophobic Fabric Bag Filled with Polyurethane Sponges Used for Vacuum‐Assisted Continuous and Ultrafast Absorption and Collection of Oils from Water

The Separation of Oil/Water Mixtures by Modified Melamine and Polyurethane Foams: A Review

Recent Progress of Polyurethane-Based Materials for Oil/Water Separation

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