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Modulating Solar Energy Harvesting on TiO2 Nanochannel Membranes by Plasmonic Nanoparticle Assembly for Desalination of Contaminated Seawater
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-10-20 , DOI: 10.1021/acsanm.0c02123
Di Wu 1 , Chenxi Zhao 1 , Yue Xu 1 , Xi Zhang 1 , Lingling Yang 1 , Yong Zhang 2 , Zhida Gao 1 , Yan-Yan Song 1
Affiliation  

Steam generation via harvesting solar energy is one of the promising approaches for seawater desalination. Nowadays, organic contamination in seawater represents a great challenge that needs to be solved. Specially, low-molecular-weight organic molecules may easily pass through distillation membranes with water steam and enter freshwater sources. In this study, we develop a solar distillation membrane (DM) for contaminated seawater desalination rather than grading treatment of contaminated seawater by integrating a large-scale TiO2 nanochannel membrane with plasmonic silver nanoparticles (Ag NPs) via inhomogeneous assembling. Such incorporation enables a self-upstanding DM acting as an efficient broad-band plasmonic absorber (200–2500 nm) and possessing high solar steam efficiencies (82% at 6 kW m–2), thus driving the photothermal desalination and photocatalytic decontamination in a synchronous fashion. The resulting membranes exhibit a rapid evaporation rate (7.14 kg m–2 h–1), helping in achieving fresh water from seawater contaminated with a high concentration of organics with remarkable durability and reusability. We believe the DM proposed in this study could pave the way for a promising point-of-use device to obtain fresh water from contaminated saline water.

中文翻译:

等离子纳米粒子组件对海水污染海水中的TiO 2纳米通道膜调节太阳能收集

通过收集太阳能产生蒸汽是海水淡化的有前途的方法之一。如今,海水中的有机污染物代表了一个需要解决的巨大挑战。特别是,低分子量有机分子很容易与水蒸气一起通过蒸馏膜进入淡水源。在这项研究中,我们通过非均质组装将大型TiO 2纳米通道膜与等离激元银纳米颗粒(Ag NPs)集成在一起,从而开发了用于污染海水淡化而不是分级处理污染海水的太阳能蒸馏膜(DM)。这种结合使得自立式DM可以用作高效的宽带等离子体吸收器(200-2500 nm),并具有很高的太阳蒸汽效率(6 kW m时为82%)–2),从而以同步方式驱动光热脱盐和光催化净化。所得的膜表现出快速的蒸发速率(7.14 kg m –2 h –1),有助于从被高浓度有机物污染的海水中获得淡水,并具有出色的耐久性和可重复使用性。我们相信,这项研究中提出的DM可以为有前途的使用点设备从受污染的盐水中获取淡水铺平道路。
更新日期:2020-11-25
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