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《Journal of Forestry Engineering》 2019-01
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Preparation and properties of nanocellulose-based oil-absorbing aerogels

ZHOU Lijie;ZHOU Huan;LI Jiajia;TAN Sicong;CHEN Peng;XU Zhaoyang;College of Materials Science and Engineering,Nanjing Forestry University;  
In recent years,much attention has been paid to aerogel materials research and as potential applications in many fields. Cellulose nanofiber(CNF) is a common renewable organic polymer in nature,which has excellent hydrophilicity,biocompatibility,high degree of polymerization,easy for chemical modification and formation of gel materials and membrane materials. In this study,nanocellulose matrix materials were prepared from bamboo powder.The polyvinyl alcohol(PVA) was used as the reinforcing phase and PVA/CNFs composite aerogels were prepared by freeze-drying under acidic conditions. Then the trimethylchlorosilane(TMCS) was used for the hydrophobic modification. After the modification,it was impregnated into a reduced graphene oxide(r GO) suspension. The hydrophobic r GO/PVA/CNFs composite aerogel was finally obtained. The morphological feature,internal pore structure,chemical construction,surface wettability,hydrophobic properties and oil absorption properties of the novel cellulose based composite aerogel were analyzed using the scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR),Raman spectroscopy(Raman),water contact angle(CA) and oil absorption performance tests. The results showed that the density of the composite aerogel was 6.78 mg/cm3. The aerogel had a uniform three-dimensional network porous structure,and the surface of the pore structure was covered by graphene sheets. After the aerogel was subjected to hydrophobic treatment by the TMCS,a hydrophobic layer structure was formed on the surface.The results of the FT-IR and Raman analysis showed that the hydrophobic modification of the TMCS did not change the chemical structure of the PVA/CNFs composite aerogel. After the aerogel was treated by hydrophobic,the water contact angle of the aerogel was about 138°,the oil absorption ratio was about 78 g/g,and the adsorption process was quick. After the oil was saturated,it could be suspended on the surface of the solution for recycling and reuse. The hydrophobic composite aerogel obtained in this study could provide a theoretical foundation for the application of CNFsbased aerogels in removing leaked oils and organic solvents.
【Fund】: 国家自然科学基金(31770607);; 江苏高校优势学科建设工程资助项目(PAPD)
【CateGory Index】: TQ427.26
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