太阳能光热产汽技术在海水淡化方面有着巨大的发展潜力和广阔的应用市场。介绍了一种黏土基光热材料的制备方法,将甘肃临泽的低品位凹凸棒(ATP)原矿经简单的分离提纯后与壳聚糖溶液复合,并加入戊二醛使其凝胶化,冷冻干燥干燥后通过火焰处理使其表面碳化,得到ATP基壳聚糖气凝胶光热材料(FACS)。该材料具有孔道开阔、表观密度低(0.0326g/cm-3)、绝热性好[导热系数0.0218W/(m·K)]、自浮、超亲水、吸光率高(约90%)等优点,在1个太阳光照度下的转换效率高达86.32%。FACS具有成本低、制备简单、可扩展、太阳能转换效率高等优点,有望成为一种具有实际太阳能产汽系统应用潜力的高效光热材料。
Solar photothermal steam production technology has great development potential and broad application market in seawater.A method of preparation clay-based photothermal materials was demonstrated.The low grade attapulgite (ATP) ore from Linze,Gansu Province was simply separated and purified,then compounded with chitosan solution and gelated by adding glutaraldehyde.After freeze-drying,the surface of ATP-based chitosan aerogel (FACS) was carbonized by flame treatment.The material had the advantages of open channel,low apparent density (0.0326g/cm3),good thermal insulation [thermal conductivity 0.0218W/(m·K)],self-floating,super hydrophilic,high light absorption (about 90%),and the conversion efficiency was as high as 86.32% under 1 sun illumination.FACS had the advantages of low cost,simple preparation,expandability and high solar energy conversion efficiency,so it was expected to become a kind of high efficiency photothermal material with practical application potential of solar steam production system.
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基金资助
国家自然科学基金(020035)
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