期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 46, 页码 55288-55295出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c20747
关键词
sunflower stalk; solar steam generation; 2D water channel; thermal management; biomass
资金
- National Natural Science Foundation of China [31770600]
- Fujian Natural Science Foundation Key Project [2020J02031]
- Department of Education of Fujian Province [JAT190129]
- Fujian Agriculture and Forestry University
In response to global freshwater scarcity, a high-efficiency solar-driven evaporator based on the composite structure of sunflower stalk has been developed, demonstrating enclosed water pathways and thermal-insulating features that achieve high evaporation rates under 1 sun irradiation. This carbon-nanotube-coated sunflower stalk-based evaporator exhibits stability, high ion rejection efficiency, and self-cleaning ability during the seawater desalination process.
Given the worsening freshwater scarcity around the world, the interfacial solar-driven steam generation for seawater desalination and wastewater treatment has attracted wide attention due to its rich energy resources, convenience, and environmental friendliness. However, challenges still remain for developing high-efficiency interfacial solar-driven steam generation devices from low-cost, readily available, and green material resources. Herein, taking advantage of the delicate composite structure of the sunflower stalk, a sunflower-stalk-based solar-driven evaporator with a confined two-dimensional (2D) water supply pathway and an enclosed thermal-insulating structure is reported. The pith of sunflower stalks is composed of well-arranged honeycomb-like parenchyma cells that endow sunflower stalks with low thermal conductivity comparable to that of synthetic plastic foam. The low-tortuosity vascular bundles in the skin can serve as a natural 2D water pathway for rapid water transportation. The benefit of these functions is that an evaporator based on a carbon-nanotube-coated sunflower stalk (C-Ss) achieves a high evaporation rate of 1.76 kg m(-2) h(-1) under 1 sun irradiation (1 kW m(-2)). The C-Ss also shows a highly stable evaporation performance, high ion rejection efficiency, and a self-cleaning ability during the actual seawater desalination process. With advantages of abundant resources, easy fabrication, and sustainability, this C-Ss-based evaporator provides a promising choice for freshwater production in developing regions.
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