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Rational microchannel distribution accelerates solar steam generation
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DOI：10.1016/j.jwpe.2025.107077.png)
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Abstract
En 中文
Porous interfacial solar steam generator (ISSG) has emerged as a promising approach for sustainable seawater desalination and wastewater purification due to its superior evaporation performance compared to the conventional bulk-heating evaporator. The porous structure of ISSG significantly promotes the evaporation rate by lowering the enthalpy of water vaporization, but its specific role in this rapid interfacial evaporation process has not been thoroughly explored in the literature, which potentially impedes the practical application of ISSG. In this study, five self-assembled graphene-based hydrogels (SGHs) with varied pore structures were prepared to investigate their impacts on vaporization enthalpy using differential scanning calorimetry and Raman spectroscopy. Among these hydrogels, SGH-3 fabricated at a graphene-oxide concentration of 3 mg center dot mL- 1 achieved an impressive net evaporation rate of 2.33 kg center dot m- 2 center dot h- 1 under 1-sun irradiation. Even in the highly saline sample (34.42 % salinity), SGH-3 maintained a relatively high evaporation rate of 1.78 kg center dot m- 2 center dot h- 1, while the salinity of treated water complied with the international guidelines of drinking water quality. Experimental results highlighted the determinant effect of porous structure such as porosity and microchannel size distribution on decreasing the vaporization enthalpy. For SGH-3, the predominate microchannels in the 5-15 mu m range balanced water clustering and replenishing and thus ensuring a continuous high-efficient evaporation process. These findings offer valuable insights into the rational structure of efficient ISSGs, broadening their application in sustainable water purification processes.
Keywords:
Sustainable desalination
Solar-driven interfacial evaporation
Evaporation efficiency
Porous structure
Water clustering
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3.3W
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