Construction of Exfoliated Montmorillonite/Cellulose Superhydrophobic Aerogel and Its Application in Efficient Oil-Water Separation
In order to solve the current problems of cellulose aerogels,such as high preparation cost,poor mechanical properties and low oil-water separation efficiency,exfoliated montmorillonite(MMTex)with low cost and large specific surface area was introduced into the cross-linking network structure of sodium carboxymethyl cellulose(CMC)and carboxylcellulose nanofibers(CNF-C).Superhydrophobic exfoliated montmorillonite/cellulose aerogels(MMTex/CMC/CNF-C)were constructed by simple freeze-drying and ambient temperature impregnation method.The results show that with the addition of exfoliated montmorillonite,the pore structure of cellulose aerogels was further regulated,and the compact,continuous and stable 3D cellular network structure was constructed.The porosity of aerogel is as high as 97.60％.Thus the mechanical and adsorption properties of cellulose aerogels are synergistically improved.In addition,MMTex/CMC/CNF-C also exhibits superior elastic recovery(rapid recovery of deformation at 60％strain),excellent resistance to acids,alkalis and salts,in the meantime,ultra-light and superhydrophobicity(contact angle of 150.4°).These ensure the efficient oil-water separation performance of aerogel and recyclability in harsh environments.The adsorption capacities could reach 24.6～53.8 g/g in the adsorption of n-hexane,cyclohexane,dichloromethane,peanut oil and waste engine oil.Furthermore,the adsorption capacity remains at 85％of the original adsorption capacity after 5 cycles and the absorbed oil could be easily recovered.This study provided references for the construction of cost-effective and efficient oil-water separation materials.
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