Bio-inspired salt-fouling resistant graphene evaporators for solar desalination of hypersaline brines
Bio-inspired salt-fouling resistant graphene evaporators for solar desalination of hypersaline brines
复制标题
用于超咸水太阳能淡化的仿生防盐垢石墨烯蒸发器
DOI：
10.1016/j.desal.2022.116197
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发表时间：
2023
期刊：
影响因子：
9.9
通讯作者：
Xiong, Guoping
中科院分区：
文献类型：
--
作者：
Wu, Shiwen;Tian, Siyu;Jian, Ruda;Zhou, Long;Luo, Tengfei;Xiong, Guoping
太阳能海水淡化可以为解决全球淡水危机提供经济和环境友好的手段。然而，在太阳能海水淡化过程中，盐晶体会沉淀并积聚在蒸发器表面，导致性能显著恶化。目前的防盐结垢策略通常遭受低蒸发速率，特别是在高盐盐水的脱盐期间。在本文中，我们提出了具有良好对齐的管状通道的生物启发石墨烯蒸发器，以实现高盐度盐水的有效太阳能脱盐，同时提高蒸发速率和长期抗盐污染性能。蒸发器内部独特的分层大小通道不仅增加了蒸发表面积，而且还为盐离子从蒸发表面快速扩散到大量盐水提供了低曲折度路径。因此，在一个太阳照射下，在高盐度盐水（20重量% NaCl溶液）中进行的24小时连续蒸发测试中，所提出的设备实现了2.60 kg m−2h− 1的高蒸发率，是先前研究中报告的最佳值之一。同时，观察到盐沉淀优先发生在顶部表面的边缘，在脱盐过程中使主要蒸发区域清洁。具有良好排列的管状通道的生物启发石墨烯蒸发器在实际的太阳能海水淡化应用中表现出巨大的潜力。
Solar seawater desalination may provide an economical and environmentally friendly means to address the global freshwater crisis. However, salt crystals can precipitate and accumulate on evaporator surfaces during solar seawater desalination, leading to significant deterioration of the performance. Current anti-salt fouling strategies generally suffer from low evaporation rates particularly during the desalination of hypersaline brines. In this paper, we propose bio-inspired graphene evaporators with well-aligned tubular channels to achieve effective solar desalination of hypersaline brines with simultaneously enhanced evaporation rate and long-term anti-salt fouling performance. The unique hierarchical large and small channels inside the evaporators not only increase evaporating surface area, but also provide low-tortuosity pathways for fast salt ion diffusion from the evaporation surfaces to bulk brine. Consequently, the proposed device achieves a high evaporation rate of 2.60 kg m−2h−1during a 24-h continuous evaporation test in a hypersaline brine (20 wt% NaCl solution) under one-sun irradiation, among the best values reported in previous studies. Meanwhile, salt precipitation is observed to preferentially occur at the edges of the top surface, leaving the main evaporation area clean during the desalination process. The bio-inspired graphene evaporators with well-aligned tubular channels exhibit great potential for practical solar seawater desalination applications.