Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
A high-efficient and salt-rejecting 2D film for photothermal evaporation
iScience ( IF 4.6 ) Pub Date : 2023-07-13 , DOI: 10.1016/j.isci.2023.107347 Yiru Su 1 , Lang Liu 1 , Xuechao Gao 2 , Wei Yu 1 , Ye Hong 3 , Chao Liu 1
iScience ( IF 4.6 ) Pub Date : 2023-07-13 , DOI: 10.1016/j.isci.2023.107347 Yiru Su 1 , Lang Liu 1 , Xuechao Gao 2 , Wei Yu 1 , Ye Hong 3 , Chao Liu 1
Affiliation
|
The solar-driven desalination is seen as a sustainable way to combat water scarcity. However, the solar steam generation efficiency has long been restricted by the high vaporization enthalpy of water and low energy density of natural sunlight. We introduced graphene oxide (GO) cross-linked with polyethyleneimine (PEI) as the photothermal material, with the enriched ammonic functional groups in modified GO membrane (GPM) activating water molecules to evaporate with much lower energy consumption. The vaporization enthalpy at the air-film interface is reduced up to 42% in GPM film by tuning the thermodynamic states of water. Consequently, GPM film enables a high evaporation rate of 2.48 kg m h with 95.7% energy conversion efficiency under 1 sun. With the aid of positive charges introduced by hydrolysis of PEI, the GPM exhibits excellent salt resistance and delivers an evaporation rate around 1.8 kg m h when treating 20 wt % NaCl solution.
中文翻译：
用于光热蒸发的高效脱盐二维薄膜
太阳能驱动的海水淡化被视为解决水资源短缺问题的可持续方法。然而，太阳能蒸汽发电效率长期以来受到水的汽化焓高和自然阳光能量密度低的限制。我们引入了与聚乙烯亚胺（PEI）交联的氧化石墨烯（GO）作为光热材料，改性GO膜（GPM）中富含氨官能团，以更低的能耗激活水分子蒸发。通过调节水的热力学状态，GPM 膜中空气-膜界面的汽化焓降低了 42%。因此，GPM 薄膜在 1 个太阳光下可实现 2.48 kg mh 的高蒸发率和 95.7% 的能量转换效率。借助 PEI 水解引入的正电荷，GPM 表现出优异的耐盐性，在处理 20 wt% NaCl 溶液时，蒸发速率约为 1.8 kg mh。
更新日期：2023-07-13
中文翻译：
用于光热蒸发的高效脱盐二维薄膜
太阳能驱动的海水淡化被视为解决水资源短缺问题的可持续方法。然而，太阳能蒸汽发电效率长期以来受到水的汽化焓高和自然阳光能量密度低的限制。我们引入了与聚乙烯亚胺（PEI）交联的氧化石墨烯（GO）作为光热材料，改性GO膜（GPM）中富含氨官能团，以更低的能耗激活水分子蒸发。通过调节水的热力学状态，GPM 膜中空气-膜界面的汽化焓降低了 42%。因此，GPM 薄膜在 1 个太阳光下可实现 2.48 kg mh 的高蒸发率和 95.7% 的能量转换效率。借助 PEI 水解引入的正电荷，GPM 表现出优异的耐盐性，在处理 20 wt% NaCl 溶液时，蒸发速率约为 1.8 kg mh。
京公网安备 11010802027423号