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采用分相法制备了不同ZrO_2含量的SiO_2-ZrO_2(5%和10%,质量分数)复合气凝胶。借助于SEM、XRD、FT-IR等手段对SiO_2-ZrO_2复合气凝胶的表面形貌、相结构和原子配位状态进行表征,并测试了其对铈的吸附性能。结果表明:SiO_2-ZrO_2复合气凝胶具有连续的多孔网络结构,且晶型呈非晶态;气凝胶中含有大量的Si-O-Zr键,各成分在原子尺度上均匀分布;SiO_2-ZrO_2复合气凝胶对Ce拥有优异的吸附性能,吸附216h后对Ce的最大吸附量为211.56mg/g。
SiO 2 -ZrO 2 (5% and 10%, mass fraction) composite aerogels with different content of ZrO 2 were prepared by the phase separation method. The surface morphology, phase structure and atomic coordination state of SiO 2 -ZrO 2 composite aerogels were characterized by means of SEM, XRD and FT-IR, and their adsorption properties to cerium were tested. The results show that the SiO_2-ZrO_2 composite airgel has a continuous porous network structure and the crystal form is amorphous. The airgel contains a large amount of Si-O-Zr bonds, and the components are uniformly distributed on the atomic scale. The ZrO 2 composite airgel has excellent adsorption performance on Ce. After 216 h adsorption, the maximum adsorption capacity for Ce is 211.56 mg / g.