A facile approach for preparation of underwater superoleophobicity cellulose/chitosan composite aerogel for oil/water separation

Peng, Haiying; Wu, Jianning; Wang, Yixi; Wang, Hao; Li, Yong; Shi, Yulin; Guo, Xuhong

doi:10.1007/s00339-016-0049-0

Cited by 54 publications

(34 citation statements)

References 28 publications

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“…After immersing the aerogel into water, its rough surface formed a thin layer of water film, and thus possessed an ultraoleophobic capability underwater. The aerogel was used to effectively separate oil–water mixtures through filtration [191], although its reusability was limited.…”

Section: Applications Of Cellulose-based Aerogelsmentioning

confidence: 99%

Cellulose Aerogels: Synthesis, Applications, and Prospects

2018

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Due to its excellent performance, aerogel is considered to be an especially promising new material. Cellulose is a renewable and biodegradable natural polymer. Aerogel prepared using cellulose has the renewability, biocompatibility, and biodegradability of cellulose, while also having other advantages, such as low density, high porosity, and a large specific surface area. Thus, it can be applied for many purposes in the areas of adsorption and oil/water separation, thermal insulation, and biomedical applications, as well as many other fields. There are three types of cellulose aerogels: natural cellulose aerogels (nanocellulose aerogels and bacterial cellulose aerogels), regenerated cellulose aerogels, and aerogels made from cellulose derivatives. In this paper, more than 200 articles were reviewed to summarize the properties of these three types of cellulose aerogels, as well as the technologies used in their preparation, such as the sol-gel process and gel drying. In addition, the applications of different types of cellulose aerogels were also introduced.

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Section: Applications Of Cellulose-based Aerogelsmentioning

confidence: 99%

Cellulose Aerogels: Synthesis, Applications, and Prospects

2018

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“…Figure 3e shows the FTIR spectra of CNF, CS, and CCSA. The characteristic peaks at 3351cm − 1 , 2893cm − 1 correspond to −OH, C−H bonds respectively (Peng et al 2016). The peak at around 3351cm − 1 is stretching vibrations of −OH and −NH.…”

Section: Characterization Of Physical Properties At Room Temperaturementioning

confidence: 98%

Structurally Integrated Properties of Random, Uni-Directional, and Bi-Directional Freeze-Dried Cellulose/Chitosan Aerogels

Chaudary

Patoary

Zhang

et al. 2021

Preprint

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Aerogels as a thermally insulating material have attracted extensive consideration in recent years due to prevailing energy consumption in building, industrial sector, and aerospace applications. Cellulose contains all the favorable properties to be used as a thermally resistant substance but due to structural instability, it needs to be impregnated with other resilient substances. We report herein the preparation of cellulose nanofiber (CNF)/chitosan (CS) isotropic and anisotropic composite aerogels (CCSA) by employing three different: random, uni-directional, and bi-directional freezing techniques, ensuing freeze-drying process to investigate the structural modification effect on the thermal and mechanical properties. Aerogels behaved distinctively along different axis due to holding entirely eccentric porous micro-orientation along lateral (perpendicular to ice growth) and axial (parallel to ice growth) directions. Randomly frozen aerogels (r-CCSA) contained uneven porous networks because of random ice crystal formation within the microstructure and resulted in isotropic characteristics with thermal conductivity (λ) of 0.038Wm-1K-1 in both axial and radial direction. whereas unidirectional frozen aerogels (u-CCSA) exhibited anisotropic microstructure and performance with lamellas in axial and honeycombed in radial direction resulting in λ value of 0.040 Wm-1K-1 and 0.034 Wm-1K-1 respectively. Similarly, the controlled temperature gradient during the preparation of bidirectional aerogels (b-CCSA) presented an anisotropic sheet-like microstructure and resulted in ultra-low thermal conductivity along the axial and radial geometry with λ of 0.33 Wm-1K-1 and 0.027 Wm-1K-1 respectively because of the Knudsen effect. CCSA reported in this work resulted in ultra-low density (5 to 16 mgcm-3), high porosity (~99.6%), and robustness mechanically with an endurance of 60% strain. Such a composite bio-mass aerogel preparation method will offer a clear insight into the adoption of the right methodology according to target practical applications with consideration of environmental safety.

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“…After all supporting material is covered, the contact angle is independent of the CNF concentration (Cheng et al, 2017b). The chitosan forms a self-assembly structure that produces a micrometer dot on the surface during Exposing more hydroxyl groups to the surface is verified by increasing the OH peak by FTIR (Peng et al, 2016b). Roughness to form a water cushion, repellency of polar liquids, and the membrane surface's zeta potential enhance its underwater oleophobicity.…”

Section: Preparation Of Superolephobic Membranesmentioning

confidence: 99%

“…Similar to the hydrophobic membranes, electrospinning was also applied to the oleophobic membranes followed by freeze-drying to fabricate aerogel. A thin layer of cellulose membranes was reported on different sources of cellulose nanofiber (Mautner et al, 2014), cellulose nanocrystal (Cheng et al, 2017b), and cellulose solution in a urea/ NaOH system (Zhou et al, 2014;Peng et al, 2016b). During heating, crystallization occurred in the cellulose solution, expelling the cellulose to form a nanosheet.…”

Section: Preparation Of Superolephobic Membranesmentioning

confidence: 99%

Bioinspired cellulose-based membranes in oily wastewater treatment

Halim

Ernawati

Ismayati³

et al. 2021

Front. Environ. Sci. Eng.

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It is challenging to purify oily wastewater, which affects water-energy-food production. One promising method is membrane-based separation. This paper reviews the current research trend of applying cellulose as a membrane material that mimics one of three typical biostructures: superhydrophobic, underwater superoleophobic, and Janus surfaces. Nature has provided efficient and effective structures through the evolutionary process. This has inspired many researchers to create technologies that mimic nature’s structures or the fabrication process. Lotus leaves, fish scales, and Namib beetles are three representative structures with distinct functional and surface properties: superhydrophobic, underwater superoleophobic, and Janus surfaces. The characteristics of these structures have been widely studied and applied to membrane materials to improve their performance. One attractive membrane material is cellulose, whichhas been studied from the perspective of its biodegradability and sustainability. In this review, the principles, mechanisms, fabrication processes, and membrane performances are summarized and compared. The theory of wettability is also described to build a comprehensive understanding of the concept. Finally, future outlook is discussed to challenge the gap between laboratory and industrial applications.

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A facile approach for preparation of underwater superoleophobicity cellulose/chitosan composite aerogel for oil/water separation

Cited by 54 publications

References 28 publications

Cellulose Aerogels: Synthesis, Applications, and Prospects

Cellulose Aerogels: Synthesis, Applications, and Prospects

Structurally Integrated Properties of Random, Uni-Directional, and Bi-Directional Freeze-Dried Cellulose/Chitosan Aerogels

Bioinspired cellulose-based membranes in oily wastewater treatment

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