Dual-Functional Graphene Oxide-Based Photothermal Materials with Aligned Channels and Oleophobicity for Efficient Solar Steam Generation.
Dual-Functional Graphene Oxide-Based Photothermal Materials with Aligned Channels and Oleophobicity for Efficient Solar Steam Generation.
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DOI：
10.1021/acs.langmuir.1c01647
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发表时间：
2021-08
期刊：
影响因子：
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通讯作者：
Lihua Chen;Jing Wei;QiuShuo Tian;Z. Han;Li Li-Li;Shujuan Meng;Qi‐Meige Hasi
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作者：
Lihua Chen;Jing Wei;QiuShuo Tian;Z. Han;Li Li-Li;Shujuan Meng;Qi‐Meige Hasi
通过太阳能蒸汽发电（SSG）进行海水淡化已成为解决全球水资源短缺问题的最有效方法之一。在这项工作中，新型的基于氧化石墨烯（GO）的太阳能蒸汽发生器（GO-SSGs）与对齐的通道，通过定向冷冻和简单的碳化的水凝胶组成的GO和聚（乙烯醇）（PVA）。得益于其优异的光吸收（光吸收效率超过94%）、更好的隔热性（导热率为0.259 W/（m K））和合适的多孔结构（这有利于快速的水输送），GO-SSG显示出上级SSG性能，在1.0 kW/m2的照射下实现高达92%的太阳能转换效率。有趣的是，独特排列的通道赋予它们良好的脱盐性能; GO-SSG在20wt% NaCl，KCl和MgCl 2盐水中的太阳能转换效率可以达到85%以上。为了提高其抗氧化性能，进行了化学亲水和疏油改性，使得即使在含油废水中也可以运行SSG;例如，在含有10重量%正十六烷的水溶液中获得了84%的太阳能转换效率。与现有的光热材料相比，该材料具有制备简单、SSG效率高、上级耐盐性好、耐盐性好等优点，有望成为一种新型的高性能光热材料，用于含油废水的脱盐，从而进一步拓展了其SSG的实际应用范围。
Desalination by solar steam generation (SSG) has emerged as one of the most efficient approaches to address the issue of global water shortage. In this work, novel graphene oxide (GO)-based solar steam generators (GO-SSGs) with aligned channels were prepared by directional freezing and simple carbonization of a hydrogel composed of GO and poly(vinyl alcohol) (PVA). Benefitting from their excellent light absorption (light absorption efficiency exceeds 94%), better thermal insulation (thermal conductivity, 0.259 W/(m K)), and suitable porous structure, which facilitates rapid water transportation, the GO-SSGs show superior SSG performance with a high solar energy conversion efficiency of up to 92% achieved under an irradiation of 1.0 kW/m2. Interestingly, uniquely aligned channels endow them with good salt-rejection performance; the solar energy conversion efficiency of GO-SSGs in 20 wt % NaCl, KCl, and MgCl2 brine can reach more than 85%. To improve their antifouling performance, a chemically hydrophilic and oleophobic modification was conducted, making it possible to run SSG even in oily wastewater; for instance, a solar energy conversion efficiency of 84% was obtained in an aqueous solution containing 10 wt % n-hexadecane. Compared with the existing photothermal materials, these materials show advantages of simple manufacture, high SSG efficiency, superior salt tolerance, and antifouling performance, which make them promising candidates as a kind of new high-performance photothermal materials for desalination even in oily wastewater, thus further expanding the scope of their practical SSG application.