School of Chemical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, Republic of Korea.
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseong-gu, Daejeon, 34141, Republic of Korea.
Chemosphere. 2022 Mar;291(Pt 3):133013. doi: 10.1016/j.chemosphere.2021.133013. Epub 2021 Nov 20.
Solar-energy-driven water purification is a promising technology for obtaining clean water during the current global climate crisis. Solar absorbers with high light absorption capacity and efficient energy conversion are critical components of solar-driven water evaporation and purification systems. Herein, we demonstrate that porous reduced graphene oxide (rGO)-based composite spheres facilitate efficient water evaporation and effective organic pollutant adsorption from water. Most solar light (>99% for 1 mm thick composites) is absorbed by the porous rGO-based composite spheres floating on water and is subsequently converted into heat, which is efficiently transferred to water at the air-water interface. Evaporation efficiency via energy conversion by the floating sphere composites reaches ∼74%. The increase in surface temperature of water also contributes to improving the adsorption capacity of the rGO-based composite spheres for organic pollutants. Furthermore, the composites can effectively block ultraviolet radiation, preventing the chemical reaction of water pollutants into harmful components.
太阳能驱动的水净化是在当前全球气候危机期间获取清洁水的一种很有前途的技术。具有高吸光能力和高效能量转换的太阳能吸收器是太阳能驱动水蒸发和净化系统的关键组成部分。本文中，我们证明了基于多孔还原氧化石墨烯(rGO)的复合球体有利于从水中高效蒸发和有效吸附有机污染物。大部分太阳光(对于 1mm 厚的复合材料来说大于 99%)被浮在水面上的多孔 rGO 基复合球体吸收，并随后转化为热能，热能有效地传递到空气-水界面的水中。通过浮球复合材料的能量转换实现的蒸发效率达到约 74%。水的表面温度升高也有助于提高 rGO 基复合材料对有机污染物的吸附能力。此外，复合材料可以有效地阻挡紫外线辐射，防止水污染物发生化学反应生成有害成分。
