Incorporation of gold nanocages into electrospun nanofibers for efficient water evaporation through photothermal heating
Incorporation of gold nanocages into electrospun nanofibers for efficient water evaporation through photothermal heating
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DOI：
10.1016/j.mtener.2018.12.008
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发表时间：
2019-06-01
影响因子：
9.3
通讯作者：
Xia, Younan
中科院分区：
文献类型：
--
作者：
Wu, Tong;Li, Haoxuan;Xia, Younan
用于水脱盐和净化的常规技术效率相对较低，因为它们通常涉及在容器底部放置加热单元以使整个液体体积沸腾。在这里，我们报告的Au纳米笼（AuNCs）的静电纺丝的聚偏氟乙烯（PVDF）的纳米纤维，通过光热加热有效的水蒸发。由于PVDF具有高度疏水性，其无纺布垫自然漂浮在水面上。在用808 nm的近红外（NIR）激光照射时，表面处的水被加热以蒸发，而本体保持在环境温度下。因此，水蒸发的效率大大提高。为了进一步证明AuNC/PVDF复合材料在太阳能水蒸发方面的潜力，我们制备了具有覆盖可见光和NIR区域的宽吸收峰的AuNC。在1000 W·m ~（-2）的自然光照下，当AuNC含量为0.05%和0.10%时，水的蒸发效率分别达到67.0%和79.8%。在太阳聚光系统的照射下，其性能与大多数已报道的浮动装置相当甚至更高。这种新系统为设计和制造可持续和可扩展的水淡化和净化浮动膜铺平了道路。(C)2018由Elsevier Ltd.出版
Conventional techniques for water desalination and purification are relatively low in efficiency because they typically involve the placement of a heating unit at the bottom of the container to boil the entire liquid volume. Herein we report the incorporation of Au nanocages (AuNCs) into electrospun nanofibers of poly(vinylidene fluoride) (PVDF) for efficient water evaporation via photothermal heating. Because PVDF is highly hydrophobic, its nonwoven mat naturally floats on the surface of water. Upon irradiation with a near-infrared (NIR) laser at 808 nm, the water at the surface is heated to evaporate while the bulk remains at the ambient temperature. As such, the efficiency for water evaporation is greatly increased. To further demonstrate the potential of AuNC/PVDF nanofiber mats for solar water evaporation, we prepare AuNCs with a broad absorption peak covering the visible and NIR regions. Under natural solar irradiation (1000 W m(-2)), water evaporation efficiencies as high as 67.0% and 79.8% are achieved when using the AuNC/PVDF nanofiber mats containing AuNCs at weight percentages of 0.05% and 0.10%, respectively. The performance is comparable or even greater than most of the reported floating devices under the illumination of sun concentration systems. This new system paves the way to the design and fabrication of sustainable and scalable floating membranes for water desalination and purification. (C) 2018 Published by Elsevier Ltd.