Robust superhydrophobic candle soot and silica composite sponges for efficient oil/water separation in corrosive and hot water

Li, Jian; Zhao, Zhihong; Kang, Ruimei; Zhang, Yan; Lv, Weizhong; Li, Mouji; Jia, Runan; Luo, Liangjie

doi:10.1007/s10971-017-4350-y

Cited by 29 publications

(9 citation statements)

References 46 publications

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“…Therefore, the prepared materials should be evaluated for their performance under these conditions. [6,32] The separation efficiency of these coatings under harsh conditions was demonstrated and it can be seen in Figure 7b that these coatings delivered excellent results in hot water. The separation efficiencies with 1M HCl and 1M NaOH was found to be >90 and >85% for mesh ( Figure 7c) and fabric (Figure 7d), respectively.…”

Section: Resultsmentioning

confidence: 93%

“…[6,7] Moreover superhydrophobic surfaces have shown efficient response in various applications including self-cleaning, bio-fouling control, and corrosion protection in addition to oil-water separation due to their water-repellent characteristics. [8][9][10][11][12][13] Literature provides a good understanding of superhydrophobic phenomenon as mimicked by creating rough micrometer and nanometer scale hierarchical structures with low surface energy.…”

Section: Introductionmentioning

confidence: 99%

“…For this purpose, a range of adhesives are used to improve the durability of superhydrophobic materials; examples of commercially available adhesives are epoxy, polydimethylsiloxane (PDMS), and polydopamine, which are used in combination with nanomaterials to fabricate durable superhydrophobic absorbents. [6,13] Few of the combinations include zinc oxide/epoxy, atapulgite/epoxy, and calcium carbonate/PDMS. [5,14] Previously materials with hydrophobic properties, that is, contact angle <150 , have also been demonstrated for oil-water separation and the recent examples are polyurethane sponge, magnetite composite nanoparticles, and reduced graphene oxide, [27,28] which reveals that a materials must remain at least in hydrophobic range to realize oil-water separation.…”

Section: Introductionmentioning

confidence: 99%

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Durable and Recyclable Superhydrophobic Fabric and Mesh for Oil–Water Separation

et al. 2017

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The authors report durable and recyclable nanocomposite superhydrophobic coatings on two different substrates of fabric and mesh as prepared by titania nanoparticles and polydimethysiloxane (PDMS). The felted wool fabric and the steel mesh are initially coated with a thin layer of PDMS, which is followed by the deposition of nanocomposite coating of titania nanoparticles embedded in PDMS. The dual surface modification of two kinds of substrates generates highly hydrophobic surface character, which is retained after durability performance as measured in ultrasonication, sand, and emery paper abrasion tests. Oil-water separation experiments are performed using water mixtures with four oils, that is, n-hexane, toluene, kerosene, and diesel to ensure the industrial applications of prepared composite materials.Moreover, nanocomposite coatings are tested for several cycles of oil-water separation in harsh conditions such as hot water, sodium chloride, and hydrochloric acid. The adopted approach improves the separation performance by inducing durability of the prepared nanocomposite coatings along with introducing recyclable character.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Durable and Recyclable Superhydrophobic Fabric and Mesh for Oil–Water Separation

et al. 2017

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“…Li et al [ 25 ] have also utilized the attapulgite coated superhydrophobic polyurethane sponge to efficiently separate oil from hot water. The same research group [ 26 ] have used superhydrophobic candle soot and silica composite sponges to easily separate out an oil from the hot water having temperature of nearly 92 °C. The 40 mL water filled glass beaker was kept on hot plate with temperature controlled at 80 °C and 10 mL diesel was added in it.…”

Section: Resultsmentioning

confidence: 99%

Oil–Water Separation by ZnO‐Based Superhydrophobic PU Sponges

Sutar

Mane

Latthe

et al. 2020

Macromolecular Symposia

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Continuous oil–water separation is not only an important topic for scientific research but also for practical applications to clean oil from industrial oily wastewater and oil‐spill pollution. In this work, polyurethane sponges are coated by ZnO using dip coating technique. ZnO‐coated sponges are modified by stearic acid to achieve superhydrophobicity. The ZnO‐coated sponges exhibit water contact angle ≈165° and oil contact angle ≈0°. The prepared superhydrophobic sponge is sustained in oil–water separation and in separation of oil–hot water mixture. Also the wetting properties of the sponge are stable in mechanical test like cutting and twisting. Stearic acid modified ZnO‐coated sponge holds good promise for oil‐spill cleanup as well as oil/water separation from harsh environments.

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“…Nevertheless, further doping or modification with low surface energy materials is a requisite for possessing robust super-hydrophobicity due to the weak inter-particle interactions and poor adhesion of the CS layer with substrates [ 41 , 42 ]. To this end, Li et al prepared a superhydrophobic sponge by dip-coating the CS and hydrophobic SiO 2 nanoparticles on the sponge skeletons, where polyurethane resin was added to enhance the mechanical strength [ 43 ]. Khosravi et al synthesized a superhydrophobic and superoleophilic steel mesh by deposition of CS nanospheres on the mesh, followed by vapor phase deposition of polypyrrole [ 44 ].…”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of Highly Hydrophobic Onion-like Candle Soot-Coated Mesh for Durable Oil/Water Separation

Song

Liu

et al. 2022

Nanomaterials

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Although sundry superhydrophobic filtrating materials have been extensively exploited for remediating water pollution arising from frequent oil spills and oily wastewater emission, the expensive reagents, rigorous reaction conditions, and poor durability severely restrict their water purification performance in practical applications. Herein, we present a facile and cost-effective method to fabricate highly hydrophobic onion-like candle soot (CS)-coated mesh for versatile oil/water separation with excellent reusability and durability. Benefiting from a superglue acting as a binder, the sub-micron CS coating composed of interconnected and intrinsic hydrophobic carbon nanoparticles stably anchors on the surface of porous substrates, which enables the mesh to be highly hydrophobic (146.8 ± 0.5°)/superoleophilic and resist the harsh environmental conditions, including acid, alkali, and salt solutions, and even ultrasonic wear. The as-prepared mesh can efficiently separate light or heavy oil/water mixtures with high separation efficiency (>99.95%), among which all the water content in filtrates is below 75 ppm. Besides, such mesh retains excellent separation performance and high hydrophobicity even after 20 cyclic tests, demonstrating its superior reusability and durability. Overall, this work not only makes the CS-coated mesh promising for durable oil/water separation, but also develops an eco-friendly approach to construct robust superhydrophobic surfaces.

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Robust superhydrophobic candle soot and silica composite sponges for efficient oil/water separation in corrosive and hot water

Cited by 29 publications

References 46 publications

Durable and Recyclable Superhydrophobic Fabric and Mesh for Oil–Water Separation

Durable and Recyclable Superhydrophobic Fabric and Mesh for Oil–Water Separation

Oil–Water Separation by ZnO‐Based Superhydrophobic PU Sponges

Facile Fabrication of Highly Hydrophobic Onion-like Candle Soot-Coated Mesh for Durable Oil/Water Separation

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