College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, People's Republic of China; Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Engesser Str. 18, Karlsruhe, 76131, Germany.
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, People's Republic of China.
J Hazard Mater. 2020 Dec 5;400:123163. doi: 10.1016/j.jhazmat.2020.123163. Epub 2020 Jun 12.
A novel ion species-responsive oil-water separation material was designed: poly ionic liquid (PIL) was carried on the graphene oxide (GO) by free radical polymerization, then the PIL modified GO sheets (GO-PIL) were coated on cotton fabric (CF). The wettability of the obtained GO-PIL coated CF (GO-PIL@CF) could be switched between hydrophilic and hydrophobic state with the exchange of different types of counteranions. Water contact angle of the GO-PIL@CF could be switched between 0 to about 145°; and correspondingly the underwater oil contact angle would change between about 148 to 0°. Because of the switchable wettability, the GO-PIL@CF could selectively separate water or oil from the oil-water mixtures. Meanwhile, due to the loose fibrous structure, the GO-PIL@CF showed relatively high permeate fluxes; in the hydrophilic state the water flux was about 36000 L/mh, while in the hydrophobic state the fluxes for the low-density oils (n-hexane and toluene) were about 59,000 and 65000 L/mh, respectively. Consequently, the separation processes could be completed simply by gravity. In addition, because of the soft and flexible mechanical property, the GO-PIL@CF could serve as wrappage of traditional absorbents and be applied directly as absorbent to remove water or oil selectively from their mixtures.
通过自由基聚合将聚离子液体（PIL）负载在氧化石墨烯（GO）上，然后将PIL 改性的 GO 片（GO-PIL）涂覆在棉织物（CF）上。所得到的 GO-PIL 涂覆的 CF（GO-PIL@CF）的润湿性可以在不同类型的抗衡阴离子交换之间在亲水性和疏水性状态之间切换。GO-PIL@CF 的水接触角可以在 0 到约 145°之间切换；相应地，水下油接触角将在约 148 到 0°之间变化。由于润湿性可切换，GO-PIL@CF 可以从油水混合物中选择性地分离水或油。同时，由于松散的纤维结构，GO-PIL@CF 表现出相对较高的渗透通量；在亲水状态下，水通量约为 36000 L/mh，而在疏水性状态下，低密度油（正己烷和甲苯）的通量分别约为 59000 和 65000 L/mh。因此，分离过程可以简单地通过重力完成。此外，由于柔软灵活的机械性能，GO-PIL@CF 可用作传统吸收剂的包裹物，并直接用作吸收剂，从其混合物中选择性地去除水或油。
