Full-Spectrum Carbon-Based Ceramic Fibers and Their Application in Seawater Desalination
[Introduction]An environmentally friendly technology that harnesses green renewable solar energy to generate thermal energy for seawater desalination is proposed and the design of a novel fibrous membrane evaporator with full-spectrum absorption capability is introduced,aiming to address global challenges such as environmental pollution and freshwater scarcity.[Method]The proposed technological process began with the preparation of nano-scale C@TiO2 fibrous membranes using the electrospinning process.These membranes then underwent in-situ carbothermal reduction at 800℃for 2 hours,resulting in the production of carbon-based ceramic C@Ti4O7 photothermal conversion materials with a dark color.[Result]The results show that the C@Ti4O7 fibrous membrane exhibits a band gap much lower than that of W-TiO2 and excellent solar light absorption capability across a wide range of wavelengths from 200 to 2 500 nm,due to the doping of C elements and Ti3+ and the presence of oxygen vacancy defects.Under a light intensity of 1 kW/m2,the surface temperature of the C@Ti4O7 fibrous membrane,floating at the air-seawater interface,can quickly rise to 74.55 °C.Consequently,the evaporation rate of seawater increases to 1.55 kg/(m2·h),resulting in a photothermal conversion efficiency as high as 90.68%.With a light intensity of 5 kW/m2,the evaporator can generate electrical signals of up to 460 mV.In addition,it is proven workable continuously for 30 days in the simulated seawater with NaCl mass fraction of 10%,without salt deposition on the surface.[Conclusion]Therefore,the adoption of carbon-based ceramic C@Ti4O7 as the photothermal conversion material for the solar-driven interfacial evaporator offers not only high efficiency in photothermal conversion,but also great potential for large-scale applications,demonstrating a broad application prospect in the field of seawater desalination.
interfacial evaporationphotothermal conversionTi4O7seawater desalinationhydroelectric power generation
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