Novel robust cellulose-based foam with pH and light dual-response for oil recovery

摘要

We fabricated pH and light dual-responsive adsorption materials which could induce the transition of surface wettability between hydrophobicity and hydrophilicity by using ATRP.The structure and morphology of adsorption materials were confirmed by ATR-FTIR,XPS,TGA and SEM.It showed that the modified cellulose (CE)based foam was hydrophobic,which can adsorb a range of oils and organic solvents in water under pH =7.0 or visible light irradiation (λ ＞ 500 nm).Meanwhile,the wettability of robust CE-based foam can convert hydrophobicity into hydrophilicity and underwater oleophobicity under pH =3.0 or UV irradiation (λ =365 nm),giving rise to release oils and organic solvents.Most important of all,the adsorption and desorption processes of the modified CE-based foam could be switched by external stimuli.Furthermore,the modified CE-based foam was not damaged and still retained original performance after reversible cycle repeated for many times with variation of surface wettability.In short,it indicates that CE-based foam materials with switchable surface wettability are new responsive absorbent materials and have owned potential application in the treatment of oil recovery.