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Hierarchical Photothermal Fabrics with Low Evaporation Enthalpy as Heliotropic Evaporators for Efficient, Continuous, Salt-Free Desalination
ACS Nano ( IF 15.8 ) Pub Date : 2021-07-26 , DOI: 10.1021/acsnano.1c01900 Zixiao Liu 1 , Zhan Zhou 1 , Naiyan Wu 1 , Ruiqi Zhang 1 , Bo Zhu 1 , Hong Jin 1 , Yumei Zhang 1 , Meifang Zhu 1 , Zhigang Chen 1
ACS Nano ( IF 15.8 ) Pub Date : 2021-07-26 , DOI: 10.1021/acsnano.1c01900 Zixiao Liu 1 , Zhan Zhou 1 , Naiyan Wu 1 , Ruiqi Zhang 1 , Bo Zhu 1 , Hong Jin 1 , Yumei Zhang 1 , Meifang Zhu 1 , Zhigang Chen 1
Affiliation
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Solar-driven seawater evaporation is usually achieved on floating evaporators, but the performances are substantially limited by high evaporation enthalpy, solid salt crystallization, and reduced evaporation due to inclined sunlight. To solve these problems, we fabricated hierarchical polyacrylonitrile@copper sulfide (PAN@CuS) fabrics and proposed a prototype of heliotropic evaporator. Hierarchical PAN@CuS fabrics show significantly decreased water-evaporation enthalpy (1956.32 kJ kg–1, 40 °C), compared with that of pure water (2406.17 kJ kg–1, 40 °C), because of the disorganization of the hydrogen bonds at the CuS interfaces. Based on this fabric, a heliotropic evaporation model was developed, where seawater slowly flows from high to low in the fabric. Under solar irradiation (1.0 kW m–2), this model exhibits a high-rate evaporation (∼2.27 kg m–2 h–1) and saturated brine production without solid salt crystallization. In particular, under inclined sunlight (angle range: from −90° to +90°), the heliotropic model retains an almost unchanged solar evaporation rate, whereas the floating model shows severe evaporation reduction (83.9%). Therefore, our study provides a strategy for reducing the evaporation enthalpy, maximally utilizing solar energy and continuous salt-free desalination.
中文翻译：
具有低蒸发焓的分层光热织物作为高效、连续、无盐脱盐的向日蒸发器
太阳能驱动的海水蒸发通常在浮动蒸发器上实现，但其性能受到高蒸发焓、固体盐结晶以及由于阳光倾斜导致蒸发减少的限制。为了解决这些问题，我们制造了分层聚丙烯腈@硫化铜（PAN@CuS）织物并提出了向日葵蒸发器的原型。与纯水 (2406.17 kJ kg –1 ) 相比，分层 PAN@CuS 织物的水蒸发焓 (1956.32 kJ kg –1 , 40 °C)显着降低, 40 °C)，因为 CuS 界面处的氢键解体。基于这种织物，开发了一种向日葵蒸发模型，其中海水在织物中从高处缓慢流向低处。在太阳辐射（1.0 kW m –2）下，该模型表现出高速率蒸发（~2.27 kg m –2 h –1）和饱和盐水生产，没有固体盐结晶。特别是在倾斜的阳光下（角度范围：从-90°到+90°），向日模型保持几乎不变的太阳蒸发率，而浮动模型显示出严重的蒸发减少（83.9%）。因此，我们的研究提供了一种降低蒸发焓的策略，最大限度地利用太阳能和连续无盐海水淡化。
更新日期：2021-08-24
中文翻译：
具有低蒸发焓的分层光热织物作为高效、连续、无盐脱盐的向日蒸发器
太阳能驱动的海水蒸发通常在浮动蒸发器上实现，但其性能受到高蒸发焓、固体盐结晶以及由于阳光倾斜导致蒸发减少的限制。为了解决这些问题，我们制造了分层聚丙烯腈@硫化铜（PAN@CuS）织物并提出了向日葵蒸发器的原型。与纯水 (2406.17 kJ kg –1 ) 相比，分层 PAN@CuS 织物的水蒸发焓 (1956.32 kJ kg –1 , 40 °C)显着降低, 40 °C)，因为 CuS 界面处的氢键解体。基于这种织物，开发了一种向日葵蒸发模型，其中海水在织物中从高处缓慢流向低处。在太阳辐射（1.0 kW m –2）下，该模型表现出高速率蒸发（~2.27 kg m –2 h –1）和饱和盐水生产，没有固体盐结晶。特别是在倾斜的阳光下（角度范围：从-90°到+90°），向日模型保持几乎不变的太阳蒸发率，而浮动模型显示出严重的蒸发减少（83.9%）。因此，我们的研究提供了一种降低蒸发焓的策略，最大限度地利用太阳能和连续无盐海水淡化。
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