A facile nanocomposite strategy to fabricate a rGO–MWCNT photothermal layer for efficient water evaporation†,Journal of Materials Chemistry A

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A facile nanocomposite strategy to fabricate a rGO–MWCNT photothermal layer for efficient water evaporation†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-11-30 00:00:00 , DOI: 10.1039/c7ta08972d
Yuchao Wang _{1,

2,

3,

4,

5} , Canzhu Wang _{1,

2,

3,

4,

5} , Xiangju Song _{1,

2,

3,

4,

5} , Suresh Kumar Megarajan _{1,

2,

3,

4,

5} , Heqing Jiang _{1,

2,

3,

4,

5}

Affiliation

Solar-driven water evaporation assisted by photothermal membranes is considered as one of the sustainable and cost-effective strategies for pure water generation and wastewater treatment. Herein, we report a facile but effective approach to improve the photothermal performance by combining 2D reduced graphene oxide (rGO) and 1D multi-walled carbon nanotubes (MWCNTs), which have different nanomorphologies. The photothermal layer can be easily deposited on different substrate materials via simple vacuum assistance. Such a composite photothermal layer shows a rough surface with a controllable nano-structure, which can thus optimize solar light harvesting. On the other hand, the formation of a loose internal porous structure and suitable wettability ensure water transport inside the photothermal layer during evaporation. The surface temperature reaches as high as 78 °C even under one sun irradiation (1 kW m⁻²), which is 10 °C higher than the result of pure rGO membranes. When loaded on a PVDF substrate, the rGO–MWCNT based membrane is flexible and shows an obvious improvement in the evaporation rate, about 79.0% and 8.9% higher than those of pure rGO and MWCNT membranes, respectively. The solar thermal conversion efficiency can reach up to 80.4% without any extra accessory for thermal management. Based on our results, the nanocomposite strategy is facile and effective for the development of novel photothermal membranes for high-efficiency evaporation, and contributes to the widespread application in the fields of desalination and wastewater treatment.

中文翻译：

制备rGO-MWCNT光热层以实现有效水蒸发的简便纳米复合材料策略†

由光热膜辅助的太阳能驱动的水蒸发被认为是用于纯水生产和废水处理的可持续且具有成本效益的策略之一。在这里，我们报告了一种简便而有效的方法，通过结合具有不同纳米形态的2D还原氧化石墨烯（rGO）和1D多壁碳纳米管（MWCNT）来提高光热性能。光热层可以通过以下方式轻松沉积在不同的基材上简单的真空辅助。这种复合光热层显示出具有可控纳米结构的粗糙表面，因此可以优化太阳光的收集。另一方面，疏松的内部多孔结构的形成和适当的润湿性确保了蒸发期间光热层内部的水传输。即使在一次阳光照射下（1 kW m ^-2），表面温度仍高达78°C），比纯rGO膜的结果高10°C。当装载在PVDF基板上时，基于rGO–MWCNT的膜具有挠性，并显示出明显的蒸发速率改善，分别比纯rGO和MWCNT膜高79.0％和8.9％。无需任何额外的热管理附件，太阳能热转换效率可以达到80.4％。根据我们的研究结果，纳米复合材料策略对于开发新型高效蒸发光热膜十分简便有效，并为淡化和废水处理领域的广泛应用做出了贡献。

更新日期：2017-11-30

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