Due to the high porosity and high absorption characteristics,aerogel has been a promising candidate material in the field of oily wastewater treatment.However,the reported aerogels were still suffering from insuffi-cient mechanical strength,complicated fabrication process and high preparation cost,which limited the applica-tion of aerogels in the field of oil-water separation.Bentonite(BT)has the characteristics of low price,abundant source and excellent mechanical properties,which can effectively improve the mechanical properties of aerogels.In this paper,hydrophobic nanocellulose-chitosan/exfoliated bentonite aerogels(CNC/BTex)were synthesized by introducing exfoliated bentonite(BTex)onto a cross-linked network of carboxycellulose nanofibres(CNF-C)and chitosan(CS)by a simple freeze-drying and ambient temperature impregnation method.The prepared CNC/BTex aerogel exhibited excellent hydrophobic properties(water contact angle 133°),recovered deformation within 5 s after extrusion and showed good mechanical properties.The adsorption capacities for different oils(hexane,cyclo-hexane,dichloromethane,cooking oil and engine oil)ranged from 18.48-40.20 g·g-1.Using dichloromethane and cyclohexane as the main research objects,the oil adsorption performance remained stable(90％of the original adsorption capacity)after five cycles of use.In summary,the present work provides a reference for the preparation of low-cost and high-performance adsorbent materials for oil-water separation.
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