采用溶胶-凝胶法，以甲基三甲氧基硅烷（MTMS）为前驱体，甲醇（MeOH）为溶剂，将SiO₂湿凝胶与纳米TiO₂复合，通过常压干燥法制备疏水型SiO₂/TiO₂复合气凝胶。利用扫描电镜（SEM）、X射线衍射仪（XRD）、红外光谱仪（FT-IR）、热重分析仪（TG）、比表面积及孔径分析仪（BET）等对所制备的复合气凝胶结构和形貌进行测试，同时研究其光催化性能与疏水性。结果表明，复合气凝胶具有三维空间网络多孔结构，孔洞尺寸大都为微纳米级，TiO₂均匀分散在气凝胶中，XRD与FT-IR证实了SiO₂/TiO₂复合气凝胶的成功制备，SiO₂/TiO₂复合气凝胶具有较好的热稳定性。所制备的SiO₂/TiO₂复合气凝胶的比表面积为479.79 m²/g，表现出较好的疏水性，接触角可达153.5°，并具有优异的光催化性能，光照3 h后对亚甲基蓝光催化降解率达98.13%。

SiO₂ wet gel is prepared by sol-gel method using methyl trimethoxy silane (MTMS) as precursor and methanol as solvent.Then a hydrophobic SiO₂/TiO₂ composite aerogel is prepared through mixing SiO₂ wet gel with nano TiO₂ by atmospheric pressure drying method.The structure and morphology of the composite aerogel are characterized by SEM,XRD,FT-IR,TG,and BET.Its photocatalytic property and hydrophobicity is also studied.The results indicate that the composite aerogel has a three-dimensional network porous structure with nanoscale pore diameter and TiO₂ is dispersed uniformly within aerogel.XRD and FT-IR detection confirms the successful preparation of SiO₂/TiO₂ composite aerogels,and TG results show that the SiO₂/TiO₂ composite aerogel has a good thermal stability.Its specific surface area is determined as 479.79 m²·g^-1,and it also shows good hydrophobicity with a water contact angle of 153.5°.It exhibits excellent photocatalytic performance that it can make the photocatalytic degradation rate of methylene blue reach 98.13% after 3 h of UV irradiation.

盛宇(1993-),男,硕士研究生,主要从事无机纳米材料研究及其在功能纺织材料的应用,1205882306@qq.com