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Migration Crystallization Device Based on Biomass Photothermal Materials for Efficient Salt-Rejection Solar Steam Generation
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-02-07 00:00:00 , DOI: 10.1021/acsaem.0c00126 Jiyan Li 1 , Xu Zhou 1 , Jiayi Zhang 1 , Chao Liu 1 , Fei Wang 1 , Yuting Zhao 2 , Hanxue Sun 1 , Zhaoqi Zhu 1 , Weidong Liang 1 , An Li 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-02-07 00:00:00 , DOI: 10.1021/acsaem.0c00126 Jiyan Li 1 , Xu Zhou 1 , Jiayi Zhang 1 , Chao Liu 1 , Fei Wang 1 , Yuting Zhao 2 , Hanxue Sun 1 , Zhaoqi Zhu 1 , Weidong Liang 1 , An Li 1
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Solar-driven interfacial water evaporation has attracted increasing interest because of its high photothermal conversion efficiency. However, a big challenge still remains as salt crystallization is a bottleneck issue that hinders their practical solar desalination applicability. Herein, we demonstrate a strategy for construction of a salt-rejection solar steam generation system by designing a migration crystallization device (MCD) using superhydrophilic carbonized green algae (SH-CGA) as photothermal materials. By a surface modification, the SH-CGA shows a superhydrophilic wettability which facilitates fast water transportation, in combination with its low thermal conductivity of 0.042 W m–1 K–1, high light absorption (98∼100%), and abundant porosity. The prepared SH-CGA exhibits a high evaporation rate of 1.35 kg m–2 h–1 and conversion efficiency of 83% under 1 kW m–2 illumination. Interestingly, we designed a simple MCD by adding a cotton thread into the margin of SH-CGA for preventing surface crystallization. No obvious salt accumulation was observed after 15 d continuous operation at real sunlight irradiation, and the device realizes the simultaneous collection of salt (24.26 g of NaCl crystallization) and water. This result may provide a novel and versatile way for creation of salt-rejection solar steam generation systems with great potential for practical solar desalination.
中文翻译：
基于生物质光热材料的迁移结晶装置，用于高效排盐太阳能蒸汽
太阳能驱动的界面水蒸发由于其高的光热转换效率而引起了越来越多的兴趣。但是，盐的结晶仍然是一个瓶颈问题，阻碍了其在实际的海水淡化中的应用，因此仍然存在巨大的挑战。在这里，我们通过设计使用超亲水碳化绿藻（SH-CGA）作为光热材料的迁移结晶装置（MCD），展示了构建排盐太阳能蒸汽发生系统的策略。通过表面改性，SH-CGA具有超亲水性，可促进快速的水传输，并具有0.042 W m –1 K –1的低导热系数，光吸收率高（98〜100％），孔隙率高。制备的SH-CGA在1 kW m -2的光照下显示出1.35 kg m -2 h -1的高蒸发速率，转换效率为83％。有趣的是，我们通过在SH-CGA的边缘添加棉线来设计简单的MCD，以防止表面结晶。在真实的日光照射下连续运行15天后，没有观察到明显的盐累积，该装置实现了盐（24.26 g NaCl结晶）和水的同时收集。该结果可以提供一种新颖且通用的方式来创建具有实际太阳能脱盐潜力的除盐太阳能蒸汽发生系统。
更新日期：2020-02-07
中文翻译：
基于生物质光热材料的迁移结晶装置，用于高效排盐太阳能蒸汽
太阳能驱动的界面水蒸发由于其高的光热转换效率而引起了越来越多的兴趣。但是，盐的结晶仍然是一个瓶颈问题，阻碍了其在实际的海水淡化中的应用，因此仍然存在巨大的挑战。在这里，我们通过设计使用超亲水碳化绿藻（SH-CGA）作为光热材料的迁移结晶装置（MCD），展示了构建排盐太阳能蒸汽发生系统的策略。通过表面改性，SH-CGA具有超亲水性，可促进快速的水传输，并具有0.042 W m –1 K –1的低导热系数，光吸收率高（98〜100％），孔隙率高。制备的SH-CGA在1 kW m -2的光照下显示出1.35 kg m -2 h -1的高蒸发速率，转换效率为83％。有趣的是，我们通过在SH-CGA的边缘添加棉线来设计简单的MCD，以防止表面结晶。在真实的日光照射下连续运行15天后，没有观察到明显的盐累积，该装置实现了盐（24.26 g NaCl结晶）和水的同时收集。该结果可以提供一种新颖且通用的方式来创建具有实际太阳能脱盐潜力的除盐太阳能蒸汽发生系统。
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