Zhou Qingxin, Li Hao, Li Dingding, Wang Beibei, Wang Hui, Bai Jinbo, Ma Shenghua, Wang Gang
State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi'an 710127, PR China; Shaanxi Joint Lab of Graphene (NWU), Xi'an 710127, PR China.
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry (Ministry of Education), College of Chemistry & Materials Science, Northwest University, Xi'an 710127, PR China; Shaanxi Joint Lab of Graphene (NWU), Xi'an 710127, PR China.
J Colloid Interface Sci. 2021 Jun 15;592:77-86. doi: 10.1016/j.jcis.2021.02.045. Epub 2021 Feb 20.
Owing to the shortage of clean water as the global problem, the exploration of photothermal substances with high performance solar steam generation for sustainable water purification is essential and urgent. Herein, we demonstrate the assembly of two-dimensional graphene into one-dimensional rough, loose, and porous fibers and further use the assembled fibers to fabricate Janus membrane evaporator. The specific configuration guarantees an enhanced light harvesting property through multiple reflections, and improves the vapor transport ability through the constructed interlaced network. As a result, the as-obtained evaporator exhibits high solar absorbance, superior photothermal property and energy conversion efficiency, which is much higher than those of other reported Janus membrane evaporators and also better than the fabricated carbon nanotube-, and graphene sheet-based Janus membrane evaporator. The water purification results indicate that the fabricated graphene fiber-based Janus membrane is highly effective in seawater desalination without obvious salt accumulation and heavy metal wastewater purification. This study proposes a neotype graphene assembly for the fabrication of Janus membrane evaporator, which has potential applications in desalination and wastewater decontamination.
由于清洁水短缺已成为全球性问题，探索具有高性能太阳能蒸汽产生能力的光热物质以实现可持续水净化至关重要且迫在眉睫。在此，我们展示了将二维石墨烯组装成一维粗糙、疏松且多孔的纤维，并进一步使用组装好的纤维制造双面蒸发膜。这种特定结构通过多次反射保证了增强的光捕获性能，并通过构建的交错网络提高了蒸汽传输能力。结果，所获得的蒸发器表现出高太阳能吸收率、优异的光热性能和能量转换效率，远高于其他已报道的双面蒸发膜，也优于所制备的基于碳纳米管和石墨烯片的双面蒸发膜。水净化结果表明，所制备的基于石墨烯纤维的双面蒸发膜在海水淡化中高效且无明显盐分积累，在重金属废水净化方面也表现出色。本研究提出了一种用于制造双面蒸发膜的新型石墨烯组装体，在海水淡化和废水净化方面具有潜在应用。
