Abstract
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 re-duces volume shrinkage and increases the three-dimensional(3D)structural stability of the material.Car-bon nanotubes(CNT)and gelatinized starch were incorporated in these aerogels as a conductive enhance-ment 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 cross-linking 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 mate-rial 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 demon-strates 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.
基金项目
the"Chenguang Program"provided by the Shanghai Education Development Foundation and Shanghai Municipal Education Commission(18CG37)
国家自然科学基金(51703024)
NETL
NSTL
维普
万方数据