Recyclable Joule heated low shrinkage carbon nanofiber aerogels for microscale oil/water separation  

作　　者：Guangkai Hu Dong Liu Sidi Yin Bin Yu Tao Huang Hao Yu Meifang Zhu 

机构地区：[1]State Key Laboratory for Modification of Chemical Fibers&Polymer Materials,College of Materials Science&Engineering,Donghua University,Shanghai 201620,China

出　　处：《Journal of Materials Science & Technology》2022年第32期89-97,共9页材料科学技术（英文版）

基　　金：the“Chenguang Program”provided by the Shanghai Education Development Foundation and Shanghai Municipal Education Commission(No.18CG37);the National Natural Science Foundation of China(No.51703024)。

摘　　要：Aerogels have shown great potential as oil adsorbents but their application to the removal of microscale oil from water and their recycling remains problematic.The present work proposed a freeze-shaping method for fabricating carbon nanofiber aerogels(CNFAs)based on the direct use of one-dimensional(1D)carbon nanofibers(CNF)rather than carbonization of polymer aerogels.This technique greatly reduces volume shrinkage and increases the three-dimensional(3D)structural stability of the material.Carbon nanotubes(CNT)and gelatinized starch were incorporated in these aerogels as a conductive enhancement agent and binder,respectively,forming a“vine(CNT)-wrapped tree(CNF)”structure that improved mechanical and Joule-heating performance.The effects of glutaraldehyde added to aerogels as a crosslinking agent on mechanical properties and microstructure were also systematically investigated.The optimized CNFAs combined with low density,high porosity,good elasticity,and superior Joule-heating efficiency along with suitable adsorption capacity,excellent selectivity,and cycling stability.This material was able to selectively remove 87%and 92%of microscale acetone and dimethylformamide(DMF),respectively,from the water after nine cycles of adsorption and Joule-heating.The present work demonstrates a novel means of designing and fabricating a low shrinkage CNFA with outstanding Joule-heating performance having potential practical applications in the remediation of organic pollution.

关 键 词：ELECTROSPINNING Carbon nanofiber aerogel Volume shrinkage Joule-heating Chemical oxygen demand 

分 类 号：TQ427.26[化学工程] TQ424