Liu Jing, Wang Luoqing, Jia Tao, Wang Zuoyu, Xu Tao, An Nan, Zhao Meng, Zhang Ruoyu, Zhao Xiuhua, Li Chenglong
Key Laboratory of Forest Plant Ecology, Ministry of Education, Engineering Research Center of Forest Bio-Preparation, Heilongjiang Provincial Key Laboratory of Ecological Utilization of Forestry Based Active Substances, College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, Heilongjiang 150040, China.
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin 130012, China.
ACS Appl Mater Interfaces. 2023 Aug 9;15(31):37609-37618. doi: 10.1021/acsami.3c09288. Epub 2023 Jul 31.
Solar-driven interfacial evaporation is considered an efficient way to get fresh water from seawater. However, the low evaporation rate, surface salt crystallization, and low energy collection of the photothermal evaporation layer limit its further application in an outdoor freshwater field. And the aggregate structure design of the material itself is often ignored in solar-driven water evaporation. Black soil (BS), with a unique soil aggregate structure, is rich in tubular pores, which can be used for multilevel sunlight utilization and good capillary water transport. Based on the extraordinary photothermal properties and pumping capacity of BS, a reasonable unidirectional salt-collecting device is designed, which can realize long-term collection of mineral salts and continuous evaporation of seawater and generate electric energy in the continuous evaporation. Inspired by the unique aggregate structure, the photothermal material doping of halloysite and nigrosin will simulate the generation of this aggregate structure and retain a good water transport effect while obtaining multistage utilization of sunlight. The solar-driven evaporation rate of a nigrosin-halloysite solar steam generator is 1.75 kg m h under 1 kW m mimic solar radiation; it can achieve stable salt leaching-induced voltage generation of 240 mV. This work demonstrates not only a solar evaporator that can continuously achieve desalination but also the design strategy of BS-like aggregate photothermal materials, which promotes the development of low-cost resource recovery and energy generation for practical outdoor seawater desalination.
太阳能驱动的界面蒸发被认为是一种从海水中获取淡水的有效方法。然而，光热蒸发层的低蒸发速率、表面盐结晶和低能量收集限制了其在户外淡水领域的进一步应用。而且在太阳能驱动的水蒸发中，材料本身的团聚体结构设计常常被忽视。黑土（BS）具有独特的土壤团聚体结构，富含管状孔隙，可用于多级阳光利用和良好的毛细水传输。基于黑土优异的光热性能和抽水能力，设计了一种合理的单向集盐装置，该装置可实现矿物盐的长期收集和海水的持续蒸发，并在持续蒸发过程中产生电能。受独特团聚体结构的启发，将埃洛石和苯胺黑进行光热材料掺杂，将模拟这种团聚体结构的产生，并在获得阳光多级利用的同时保留良好的水传输效果。在1kW m模拟太阳辐射下，苯胺黑-埃洛石太阳能蒸汽发生器的太阳能驱动蒸发速率为1.75kg m h；它可以实现240mV的稳定盐浸出诱导电压产生。这项工作不仅展示了一种能够持续实现海水淡化的太阳能蒸发器，还展示了类黑土团聚体光热材料的设计策略，这推动了用于实际户外海水淡化的低成本资源回收和能源产生的发展。
