In this work, we present a simple droplet microfluidic approach for generating graphene oxide (GO) hydrogel composite particles for oil decontamination. By stepwise solvent exchanges, the resulted hydrophilic GO hydrogel composite particles were transferred into organic media without any chemical modifications. As the GOs were locked tightly in hydrogel network, they were hardly changed during the processes of solvent exchanges. Thus, their polar surfaces remained in direct contact with the exchanged organic media, which indicated that the transferred GO particles were capable of effectively adsorbing polar impurities. Attractively, by encapsulating hollow cores and additional magnetic nanoparticles into the emulsion templates during the fabrication, the GO hydrogel composite particles were imparted with hierarchical porous structures and controllable movement capability, both of which could improve their efficiency of impurities adsorbing. These features make the GO hydrogel composite particles described here ideal for oil decontamination.

在这项工作中，我们提出了一种用于产生油污的氧化石墨烯（GO）水凝胶复合颗粒的简单液滴微流控方法。通过逐步的溶剂交换，将所得的亲水性GO水凝胶复合颗粒转移到有机介质中，而没有任何化学修饰。由于GO紧密地锁定在水凝胶网络中，因此在溶剂交换过程中几乎不变。因此，它们的极性表面保持与交换的有机介质直接接触，这表明转移的GO颗粒能够有效地吸附极性杂质。有吸引力的是，在制造过程中，通过将空心核和其他磁性纳米粒子封装到乳液模板中，GO水凝胶复合颗粒具有分级的多孔结构和可控的运动能力，两者均可提高其杂质吸附效率。这些特性使此处所述的GO水凝胶复合颗粒成为油污净化的理想选择。