Preparation of anti-fouling CFC/TiO2 photothermal fabric and its application in seawater desalination
Solar-driven seawater evaporation has been considered an effective strategy to solve the freshwater crisis,but natural seawater contains oil and organic contaminants that adhere easily to photothermal film during long-term evaporation,thus deteriorating the evaporation performance.To achieve long-term anti-fouling evaporation,we reported the construction of TiO2-coated carbon fiber cloth(CFC)with photothermal/photocatalytic features.TiO2 nanorods(diameter:～0.47 pm,length:～1.49 pm)were in-situ grown on CFC(as substrate material)surface by a hydrothermal method.CFC/TiO2 fabric shows super-hydrophilic and super-oleophobic performance,and it displays a strong photoabsorption in a wide range(280 to 2500 nm)with an absorption efficiency of 88％.CFC/TiO2 also exhibits photocatalytic activity toward organic pollutants under simulated sunlight,for instance,73％of tetracycline hydrochloride(TC)could be degraded within 200 min.Subsequently,CFC/TiO2 is hanging between the seawater tank and the empty tank to form a hanging-model evaporator.Under simulated sunlight(1 kW/m2)irradiation,part of the seawater can be evaporated at a high rate of 1.68 kg/(m2·h),while the concentrated seawater can drip from the fabric bottom,avoiding solid-salt crystallization during long-term evaporation.Therefore,the photothermal/photocatalytic fabric has the potential to promote solar desalination towards practical applications.
solar photothermal seawater evaporationanti-foulingcarbon fiber clothtitanium dioxidesalt-resistance
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