Highly compressible and durable superhydrophobic cellulose aerogels for oil/water emulsion separation with high flux

Yu, Yucong; Shi, Xiaolong; Liu, Lin; Yao, Juming

doi:10.1007/s10853-020-05441-5

Cited by 47 publications

(19 citation statements)

References 41 publications

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“…Nano brous aerogel (NFA) is one kind of three-dimensional (3D) materials constructed by assembly of nano bers, which possess favorable features such as low density, high porosity, large speci c surface area, good pore interconnectivity and controllable shape [17][18][19], which have been attracting signi cant interests in the led of oil-water separation. Notably, as far as we know, most of the studies on NFAs were based on cellulose nano bers as the building blocks.…”

Section: Introductionmentioning

confidence: 99%

Chemical Vapor Deposition Based Superelastic and Superhydrophoboic Thermoplastic Polymeric Nanofibrous Aerogels for Water Purification

Jiang

Xiao

et al. 2022

J Inorg Organomet Polym

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Developing high-performance, low-cost and large-scale absorbent materials is crucial for the treatment of water pollution caused by pollutants leakage and emission. Herein, superelastic and superhydrophobic thermoplastic polymeric nano brous aerogels (NFAs) were created for removal pollutants from water by using a facile and effective method. Poly(vinyl alcohol-co-ethylene) (EVOH) nano bers fabricated by mass-production techniques were used to construct three-dimensional NFAs through combing freezedrying process and cross-linking treatment. The optimal parameters for creating EVOH NFAs with good formability and resilience, including composition and ratio of dispersion, dosage of cross-linking agent were obtained through experiments. EVOH nano bers bonded with each other by glutaraldehyde under acidic conditions to from brous network structure in EVOH NFAs. The silane-coated EVOH NFAs were prepared through further modi cation with vapor-phase methyltrichlorosilane. The deposition of siloxane improved mechanical strength and decreased plastic deformation after 500 cyclic compressions. An asperate brous and granular siloxane coating was deposited on the surface of EVOH NFAs. The surface water contact angle increased from 104.4 ± 4.0° to 152.7 ± 1.9°, wettability of NFAs transitioned to being superhydrophobic. Silane-coated EVOH NFAs exhibited superior absorption capacity (40-92 g/g) for a variety of organic pollutants.The organic pollutants would be collected and the sorbents could be reused after distillation or squeezing. A successful scale-up of such materials open up a new insight into design polymeric aerogels in low-cost and large-scale with substantial industrial water puri cation applications.

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Section: Introductionmentioning

confidence: 99%

Chemical Vapor Deposition Based Superelastic and Superhydrophoboic Thermoplastic Polymeric Nanofibrous Aerogels for Water Purification

Jiang

Xiao

et al. 2022

J Inorg Organomet Polym

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“…The microstructure, chemical structure, and surface wettability of the samples were measured by field emission scanning electron microscopy (FESEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and the WCA, respectively, in which the test conditions were reported in our previous report. 6 The average pore size and specific surface areas were tested using a mercury porosimeter (Micromeritics Autopore VI 9510, USA). The mechanical compression properties, including the cyclic compression of samples were performed using an Instron 5967 universal tester with a water tank (Instron Corp., USA) with a rate of 2 mm/min.…”

Section: Methodsmentioning

confidence: 99%

“…% NaOH/12 wt. % urea solutions to prepare cellulose solution. ,, MBA (0.9 g) as a cross-linker was mixed into the above cellulose solutions (100 g) under stirring for 10 min. The mixed solutions formed hydrogels after standing for 6 h at 20 °C.…”

Section: Methodsmentioning

confidence: 99%

“…Increasing discharges of oily sewage with the continuous development of petrochemical industry have caused severe risks to environmental sustainability and human health. , Ways to separate oil/water mixtures with low-budget and reduced operating units attract considerable attention from researchers around the world. Compared with electrolysis, centrifugation, and flocculation, filtration technology is acknowledged as an efficient strategy for oily wastewater treatment because of its lower energy consumption, higher efficiency, and easy automation. − To efficiently separate different kinds of oil/water mixtures, filtration materials should be designed with opposite wettability to oil and water. Furthermore, hydrophilic materials are suitable for the separation of oil-in-water (O/W) systems, while the hydrophobic ones are available in the systems of water-in-oil (W/O).…”

Section: Introductionmentioning

confidence: 99%

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Robust and Versatile Cellulose Aerogel with a Self-Wettable Surface for Efficient Dual Separations of Oil-in-Water and Water-in-Oil Emulsions

Shi

Liu

et al. 2022

ACS Appl. Polym. Mater.

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Separation materials with unique surface wettability have been regarded as promising candidates for oily sewage treatment. However, simple and facile fabrication of superwettable materials integrating robust and tunable surface features is still a challenge. Inspired by the unique molecular structure of cellulose with a rigid skeleton and abundant hydroxyl groups, this work proposed highstrength, superhydrophilic, and underwater superoleophobic cellulose aerogels prepared via facile chemical cross-linking without any surface modification. Benefiting from the superporous microstructure and unique surface wettability, the cellulose aerogels exhibited on-demand separation performances for oil-in-water (O/W), water-in-oil (W/O) emulsions, and crude oil. The superior separation flux of 19,602 L/ (m 2 h) and a rejection of 99.5% were acquired for O/W emulsion, while 5158 L/(m 2 h) of flux and 98.9% of rejection were acquired for W/O emulsions. Importantly, the cellulose aerogels show an outstanding efficiency for crude oil/water emulsions with flux from 7815 to 26,648 L/(m 2 h) based on water content. Moreover, owing to the rigid skeleton and cross-linked cellular architecture, the aerogels displayed significant flexibility and toughness with tiny deformation of 0.15% after 60 cycles underwater, endowing it with excellent reusability. Thereby, this proposed cellulose aerogel with unique advantages of a robust, superhydrophilic, and underwater superoleophobic surface exhibits a promising application in versatile and efficient dual oil/water separation.

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“…A bottom-up assembly process is commonly used for the preparation of superhydrophobic aerogels [ 19 , 20 ]. So far, a variety of superhydrophobic aerogels have been developed, including silica-based aerogels [ 21 , 22 ], carbon-based aerogels [ 23 , 24 , 25 , 26 ], cellulose-based aerogels [ 27 , 28 , 29 , 30 , 31 , 32 ], and boron nitride aerogels [ 33 ], etc. Among them, the cellulose aerogel has been considered as the most promising aerogel.…”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of Superhydrophobic Cross-Linked Nanocellulose Aerogels for Oil–Water Separation

et al. 2021

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A facile and environmental-friendly approach was developed for the preparation of the cross-linked nanocellulose aerogel through the freeze-drying process and subsequent esterification. The as-prepared aerogel had a three-dimensional cellular microstructure with ultra-low density of 6.05 mg·cm−3 and high porosity (99.61%). After modifying by chemical vapor deposition (CVD) with hexadecyltrimethoxysilane (HTMS), the nanocellulose aerogel displayed stable super-hydrophobicity and super-oleophilicity with water contact angle of 151°, and had excellent adsorption performance for various oil and organic solvents with the adsorption capacity of 77~226 g/g. Even after 30 cycles, the adsorption capacity of the nanocellulose aerogel for chloroform was as high as 170 g/g, indicating its outstanding reusability. Therefore, the superhydrophobic cross-linked nanocellulose aerogel is a promising oil adsorbent for wastewater treatment.

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Highly compressible and durable superhydrophobic cellulose aerogels for oil/water emulsion separation with high flux

Cited by 47 publications

References 41 publications

Chemical Vapor Deposition Based Superelastic and Superhydrophoboic Thermoplastic Polymeric Nanofibrous Aerogels for Water Purification

Chemical Vapor Deposition Based Superelastic and Superhydrophoboic Thermoplastic Polymeric Nanofibrous Aerogels for Water Purification

Robust and Versatile Cellulose Aerogel with a Self-Wettable Surface for Efficient Dual Separations of Oil-in-Water and Water-in-Oil Emulsions

Facile Fabrication of Superhydrophobic Cross-Linked Nanocellulose Aerogels for Oil–Water Separation

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