Stable Self‐Floating Reduced Graphene Oxide Hydrogel Membrane for High Rate of Solar Vapor Evaporation under 1 sun,Global Challenges

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Stable Self‐Floating Reduced Graphene Oxide Hydrogel Membrane for High Rate of Solar Vapor Evaporation under 1 sun
Global Challenges ( IF 4.4 ) Pub Date : 2020-09-28 , DOI: 10.1002/gch2.202000053
Pengyu Zhuang _{1,

2} , Duo Li ₁ , Ning Xu ₁ , Xiaoqiang Yu _{2,

3} , Lin Zhou ₁

Affiliation

Highly efficient vapor generation with considerable stability under natural solar irradiance is a promising technology for seawater desalination and wastewater purification. Here a broadband solar absorber of reduced graphene oxide hydrogel membrane (rGOHM), synthesized via an environmentally friendly one‐step hydrothermal reduction process, is demonstrated, which shows a high rate of solar vapor production and superior stability. The porous rGOHM containing more than 99.5% water within its small volume floats on the surface of water, exhibiting efficient solar absorption of ≈98% across 300–2500 nm, as well as sufficient water‐pumping pathways. The evaporation rate can be tuned by changing the water volume. By controlling the water volume, the self‐floating rGOHM can enable efficient interfacial solar vapor generation at a high rate of ≈2.33 kg m⁻² h⁻¹ under 1 sun, which is comparable to the rate generated by the evaporator with an extra insulator. In addition, the evaporation rate of rGOHM is only slightly affected at a high saltwater concentration (at least 15 wt%), and the rGOHM shows mechanical and physical stability. The superior evaporation performance combined with efficient eradication of wastewater contaminants, cost‐effectiveness, and straightforward fabrication process, makes this rGOHMs ideal for advanced high‐concentration seawater desalination and wastewater treatment technologies.

中文翻译：

稳定的自漂浮还原氧化石墨烯水凝胶膜，可在 1 个太阳下实现高速率的太阳蒸汽蒸发

在自然太阳辐照下具有相当稳定性的高效蒸汽发生是海水淡化和废水净化的一项有前途的技术。这里展示了一种通过环保的一步水热还原工艺合成的还原氧化石墨烯水凝胶膜（rGOHM）的宽带太阳能吸收器，它具有高太阳能蒸汽产生率和卓越的稳定性。多孔rGOHM在其小体积内含有超过99.5%的水，漂浮在水面上，在300-2500 nm范围内表现出约98%的高效太阳能吸收，以及足够的抽水路径。蒸发速率可以通过改变水量来调节。通过控制水量，自浮式rGOHM可以在1个太阳下以约2.33 kg m ⁻² h ⁻¹的高速率实现高效的界面太阳能蒸汽产生，这与带有额外绝缘体的蒸发器产生的速率相当。此外，rGOHM 的蒸发速率在高盐水浓度（至少 15 wt%）下仅受到轻微影响，并且 rGOHM 显示出机械和物理稳定性。卓越的蒸发性能与有效消除废水污染物、成本效益和简单的制造工艺相结合，使该 rGOHM 成为先进的高浓度海水淡化和废水处理技术的理想选择。

更新日期：2020-09-28

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