Yeran Li
(, ), Xing Liu
(, ), Yifan Wang
(, ), Shengjie Bi
(, ), Jing Li
(, ), Jingbo Wang
(, ), Yongchao Duo
(, ), Zhengtao Zhu
(, ), Xin Jin
(, ), Wenyu Wang
(, )
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引用次数: 0
Abstract
Solar desalination via interfacial solar-driven vapor generation is an eco-friendly method for purifying seawater and wastewater into freshwater. In this study, we designed a polypyrrole (PPy)-coated sandwich wettability structure to achieve highly efficient, cost-effective, salt-resistant, and durable solar desalination. The structure consists of a top hydrophobic layer coated with the photothermal polymer PPy, a hydrophilic melamine foam (MF) interlayer with high porosity and mechanical strength, and a bottom layer with variable hydrophobicity. The PPy polymer efficiently absorbs broadband solar energy and retains heat in situ, while the strategically designed hydrophobic top layer, combined with a hydrophilic middle layer, effectively mitigates salt accumulation. The cost-effective MF network contains interconnected microporous channels that facilitate water supply, form confined water clusters, and reduce evaporation enthalpy. The tunable hydrophobicity of the bottom layer in the central region controls the water transport rate, balancing water supply and evaporation. Meanwhile, the hydrophobic bottom layer at the edges provides self-floatability, minimizing heat loss and enhancing solar vapor conversion efficiency. This sandwich wettability structure achieved an exceptional evaporation rate of 2.71 kg m2 h−1 under 1 sun irradiation. Moreover, it consistently desalinated and purified brine and seawater under natural outdoor lighting conditions. The proposed solar desalinator, featuring a simple, low-cost, and long-lasting design with effective salt rejection, represents a promising technology for highly efficient freshwater production, leveraging sustainable energy to help address the global freshwater crisis.
通过界面太阳能驱动蒸汽产生的太阳能海水淡化是一种将海水和废水净化成淡水的环保方法。在这项研究中,我们设计了一种聚吡咯(PPy)涂层的三明治润湿结构,以实现高效、经济、耐盐和耐用的太阳能海水淡化。该结构由涂有光热聚合物PPy的顶部疏水层、具有高孔隙率和机械强度的亲水性三聚氰胺泡沫(MF)中间层和具有可变疏水性的底层组成。PPy聚合物有效地吸收宽带太阳能并保持原位热量,而精心设计的疏水顶层与亲水中间层相结合,有效地减轻了盐的积累。具有成本效益的MF网络包含相互连接的微孔通道,有助于供水,形成承压水簇,并降低蒸发焓。中央区底层疏水性可调,控制水分输送速率,平衡供水量和蒸发。同时,边缘的疏水底层提供了自浮性,最大限度地减少了热量损失,提高了太阳能蒸汽转换效率。这种夹层润湿性结构在1次太阳照射下的蒸发速率达到了2.71 kg m2 h−1。此外,在室外自然光照条件下,它可以持续淡化和净化盐水和海水。太阳能脱盐器具有简单、低成本和持久的设计,具有有效的除盐作用,代表了一种有前途的高效淡水生产技术,利用可持续能源帮助解决全球淡水危机。
期刊介绍:
Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.