Ultra porous nanocellulose aerogels as separation medium for mixtures of oil/water liquids

Amphiphilic superabsorbent cellulose nanofibril aerogels

“…50 g per g absorption capacity. Nanocellulose aerogels from freeze-drying of aqueous nanocellulose suspensions 17,18 were modied to be hydrophobic and oleophilic with TiO 2 coating 19,20 or vapor phase silanization, 21 serving as absorbents [19][20][21] for linear and cyclic alkanes and chloroform at up to 40 g per g absorption capacities, 20,21 however, no higher than absorbents from previously mentioned natural bers.…”

“…Although nanocellulose aerogels have been made hydrophobic to absorb oils, 17,20,21 their oil absorbency was low (around 40 g per g) and densities were high (over 10 mg cm À3 ).…”

Cellulosic Substrates for Removal of Pollutants from Aqueous Systems: A Review. 3. Spilled Oil and Emulsified Organic Liquids

“…Increased uptake of oil onto cellulosic substrates has been shown following alkylation, which made the materials more hydrophobic (Ball 1973;Maurin et al 1999;Sun et al 2002Sun et al , 2003Ludwick et al 2003;Deschamps et al 2003a,b;Adebajo and Frost 2004;Dankovich and Hsieh 2007;Rattanawong et al 2007;Said et al 2009;Sathasivam and Haris 2010;Bayer et al 2011;Tao et al 2011;Gao et al 2010Gao et al , 2011Gao et al , 2012Cervin et al 2012;Payne et al 2012). Alternatively, wax can be applied to render the surfaces more hydrophobic and more capable of sorbing oil (Raible 1990).…”

“…Even greater benefits, in terms of oil sorption capacity, have been demonstrated when cellulosic structures have been derivatized with longerchain alkyl groups (Ball 1973;Maurin et al 1999;Deschamps et al 2003a,b;Ludwick et al 2003;Dankovich and Hsieh 2007;Said et al 2009;Cervin et al 2012) or with oilloving cyclodextrins (Ding et al 2011;He et al 2012). Rosin, a hydrophobic agent that is often used to reduce the water-absorptivity of paper, has been shown also to improve the ability of papermaking fibers to take up oil (Ericsson 1985).…”

Biomimetic adsorption of zwitterionic–xyloglucan block copolymers to CNF: towards tailored super-absorbing cellulose materials

“…1 CNF is considered hydrophilic in character and has been used for several 3-D structured materials such as water or oil absorbing aerogels 4,5 and more moisture stable lms by forming a stated core-shell structure of CNF coated with xyloglucan. 6 CNF is commonly used to produce transparent lms by either casting a CNF water dispersion in a Petri dish, or by vacuum ltration to give strong and stiff networks, as shown previously by Isogai et al 7 and Berglund et al 8 Modication of cellulose can be necessary to impart specic properties to the cellulose surface or cellulose bulk materials.…”