木棉纤维基复合炭气凝胶的制备及其大气集水性能研究OA

Kapok fiber-based carbon aerogel(KFCA)with a hollow tubular structure was prepared from kapok fibers via a homogenization-atmospheric-pressure drying-carbonization process.Subsequently,an ethanolamine-modified lithium chloride(E-LiCl)hygroscopic agent was introduced into the KFCA framework by impregnation to obtain the E-LiCl/kapok fiber-based hygroscopic composite carbon aerogel(EKFCA).The structure of EKFCA was characterized by scanning electron microscopy(SEM),Fourier transform infrared(FT-IR)spectroscopy,X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and Raman spectroscopy.The results indicated that the synergistic effect of the excellent photothermal properties of the carbon aerogel and the hygroscopic salt enabled water vapor adsorption and desorption within a single layer,thereby achieving the havesting of atmospheric water.Under the condition of temperature of 25 ℃ and relative humidity of 65％,the water absorption of EKFCA was 1.88 g/g,which had more outstanding moisture absorption performance.In addition,the composite carbon aerogel could quickly absorb solar energy under light and convert it into heat energy,and the surface of the material could rise rapidly to 75℃ within 10 min under the light intensity of 100 mW/cm2,and the evaporation efficiency could reach 83.02％.After ten cycles,7.09％of the adsorbed water was left in the composite carbon aerogel,and 92.91％of the water was released,both water adsorption and desorption properties did not change significantly,and the composite carbon aerogel had outstanding hygroscopic properties.The water adsorption performance and water desorption performance did not change greatly,and it had high cyclic stability.