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      저자 : Hemal Weerasinghe (검색결과 1 건)
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        Single-step room temperature synthesis of vanadium oxide nanosheets for seawater/wastewater purification by photothermal evaporation under one sun illumination

        Hemal Weerasinghe,Hui-Fen Wu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-

        Vanadium dioxide has excellent absorbance in near-infrared (NIR) wavelengths making it a perfect candidatefor photothermal applications based on solar energy. However, up to date, it was mainly applied ina lithium-ion battery. This study is for the second time, to utilize VO2-based nanomaterials as a photothermalmaterial for solar steam generation to purify seawater and wastewater. The study has proposeda straightforward and promising room temperature approach to synthesize a mixture of twovanadium oxide nanosheets with a major fraction of VO2 (B) nanosheets with the major part for VO2. nH2O and a minor fraction of V2O5.nH2O which have demonstrated excellent photothermal capabilityfor water purification. The highest steady state temperature of 87 C was reported by the synthesizednanosheets that were spray coated on cellulose fabric for the solar absorption purpose under one sun illuminationfor water purification. The as-prepared photo absorber was capable of reaching the higheststeady temperature at high speed (within 10 minutes). The synthesized 2D VO2/V2O5.nH2O nanosheetsand cellulose fabric combination of solar steam generator gained a competitive evaporation rate of1.31 kgm-2h1 and a percentage efficiency of 89.7% under one sun illumination. The current approachwas successfully applied to three real-world samples to obtain clean or drinking water. All three samplesshowed excellent improvements in their water quality compared with their initial states in a single distillation. Two samples can even reach the quality of World Health Organization (WHO)-recommendedstandards for drinking water. The current approach has opened a new platform for the utilization ofVO2-based nanosheets for obtaining clean water from seawater and wastewater by solar energyutilization.

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