Title : Solar Driven Interfacial Steam Generation Derived from Biodegradable Luffa Sponge for efficient and cost-effect water purification
A chemically treated luffa sponge (LS) derived from the ripe fruit of the Luffa cylindrica (LC) plant was investigated as an efficient solar photothermal conversion material for water purification applications for the very first time. Hydrophilicity and solar absorbance of the LS were enhanced by dopamine treatment and candle soot surface coating. The fabricated surface modified LS (SM-LS) leads to achieving a superb solar evaporation rate of water as high as 1.30 kg m–2 h–1, which is 5 times higher than that of the freshwater under 1 sun illumination. The outdoor experiment has shown an excellent solar evaporation efficiency of 79.98%, which is significantly higher than other low-cost materials. Such SM-LS can be further applied to desalinate the seawater, where it has been examined that 1 m2 of surface-modified LS can produce 7.5–8 L of freshwater per day. Hence, the proposed system can be utilized in remote areas and refugee camps.