Cellulosic sponges with pH responsive wettability for efficient oil-water separation.
作者：Lijie Li, Liduo Rong, Zhangting Xu, Bijia Wang, Xueling Feng, Zhiping Mao, Hong Xu, Jinying Yuan
關鍵字：Cellulosic sponges， pH responsive ，Enamine bonds， Switchable wettability ，Oil-water separation
論文來源：期刊
發表時間：2020年
To obtain efficient oil-water separation materials with responsiveness, cellulosic porous materials with switchable wettability in response to pH changes were developed by reacting cellulose acetoacetate sponges with alkylamines of varying carbon chain length via dynamic covalent enamine bonds. The resulting sponges reversibly changed between being superhydrophilic (θwater?=?0°) and highly hydrophobic (maximal θwater?=?146°) under suitable pH conditions while maintained the favorable porous structures. Notably, the functionalized sponges exhibited high and selective oil absorption capacity (40-80?g/g) and satisfying desorption ability of 80%, and could efficiently separate oil-water mixtures and emulsions with extremely high efficiency (> 99%) in a controllable manner. With the three-dimensional micro/nano porous structure, switchable wettability and intrinsic environmentally friendliness, the pH responsive cellulosic sponges developed here hold great potential in controllable oil-water separation and oily wastewater purification.