Fabrication of ground biotite based composite hydrogels for solar-driven water evaporation
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文章以黑云母粉为光热转换材料、聚乙烯醇和壳聚糖为凝胶基底材料,经交联和冻融处理制备基于云母的复合水凝胶.通过X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)以及扫描电子显微镜-能量散射 X 射线光谱(scanning electron microscopy-energy dispersive X-ray spectroscopy,SEM-EDS)分析技术确定黑云母粉含有铁元素,其质量分数约为3.86％.片层状结构黑云母粉的加入使水凝胶的压缩应力提升1倍以上,显著增强了水凝胶的力学性能.复合水凝胶的太阳能水蒸发速率可以达到1.52 kg/(m2·h).
With natural ground biotite as a photothermal conversion material and a mixture of polyvinyl alcohol and chitosan as polymeric scaffold,a series of ground biotite based composite hydrogels were prepared by cross-linking and freeze-thaw process.According to the results of X-ray photoelectron spectroscopy(XPS)and scanning electron microscopy-energy dispersive X-ray spectroscopy(SEM-EDS),the existence of iron component in ground biotite is confirmed,and the content is about 3.86％by mass.The compressive stress of the hydrogels is more than double by the addition of the ground biotite with lamellar structure,which is conducive to enhancing the mechanical properties of the hy-drogels.The solar-driven water evaporation rate of the hydrogels is as high as 1.52 kg/(m2·h).
ground biotitesolar photothermal conversion materialhydrogelcompositesolar-driven water evaporation
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