Abstract：The silica-titania aerogel beads were synthesized through sol-gel reaction followed by supercritical drying, in which TEOS and TBT as co-precursors, EtOH as solvents, HAC and NH3·H2O as catalysts. The as-prepared aerogel beads were characterized by SEM,TEM,XRD,FT-IR,TG-DTA and nitrogen adsorption-desorption. The results indicate that the diameter distribution of beads are between 1-8mm, the average diameter of beads is 3.5mm. The aerogel beads have nanoporous network structure with high specific surface area of 914.5m2/g, and the TiO2 particles are distributed in the aerogel uniformly, which keep the anatase crystal under high temperature.
 DORCHEH A S,ABBASI M H.Silica aerogel:synthesis,properties and characterization[J].Journal of Materials Processing Technology,2008,199(1):10-26.
 HRUBESH L W.Aerogel applications[J].Journal of Non-Crystalline Solids,1998,225:335-342.
 张志华,王文琴,祖国庆,等.SiO2气凝胶材料的制备、性能及其低温保温隔热应用[J].航空材料学报,2015,35(1):87-96. ZHANG Z H,WANG W Q,ZU G Q,et al.Silica aerogel materials:preparation,properties,and applications in low-temperature thermal insulation[J].Journal of Aeronautical Materials,2015,35(1):87-96.
 余煜玺,吴晓云,伞海生.常压干燥制备疏水性SiO2-玻璃纤维复合气凝胶及表征[J].材料工程,2015,43(8):31-36. YU Y X,WU X Y,SAN H S.Preparation and characterization of hydrophobic SiO2-glass fibers aerogels via ambient pressure drying[J].Journal of Materials Engineering,2015,43(8):31-36.
 ALNAIEF M,SMIRNOVA I.In situ production of spherical aerogel microparticles[J].The Journal of Supercritical Fluids,2011,55(3):1118-1123.
 HONG S K,YOON M Y,HWANG H J.Fabrication of spherical silica aerogel granules from water glass by ambient pressure drying[J].Journal of the American Ceramic Society,2011,94(10):3198-3201.
 REIM M,REICHENAUER G,KÖRNER W,et al.Silica-aerogel granulate-structural,optical and thermal properties[J].Journal of Non-Crystalline Solids,2004,350:358-363.
 贾云砚,甘礼华,王玉栋,等.SiO2气凝胶小球的制备及表征[J].化工科技,2005,12(6):6-9. JIA Y Y,GAN L H,WANG Y D,et al.Preparation and characterization of SiO2 aerogel balls[J].Science & Technology in Chemical Industry,2005,12(6):6-9.
 XU Z,GAN L,JIA Y,et al.Preparation and characterization of silica-titania aerogel-like balls by ambient pressure drying[J].Journal of Sol-Gel Science and Technology,2007,41(3):203-207.
 SARAWADE P B,KIM J K,HILONGA A,et al.Synthesis of sodium silicate-based hydrophilic silica aerogel beads with superior properties:effect of heat-treatment[J].Journal of Non-Crystalline Solids,2011,357(10):2156-2162.
 SARAWADE P B,KIM J K,HILONGA A,et al.Production of low-density sodium silicate-based hydrophobic silica aerogel beads by a novel fast gelation process and ambient pressure drying process[J].Solid State Sciences,2010,12(5):911-918.
 REN C,QIU W,CHEN Y.Physicochemical properties and photocatalytic activity of the TiO2/SiO2 prepared by precipitation method[J].Separation and Purification Technology,2013,107:264-272.
 INGALE S V,WAGH P B,TRIPATHI A K,et al.Physico-chemical properties of silica aerogels prepared from TMOS/MTMS mixtures[J].Journal of Porous Materials,2011,18(5):567-572.
 CHENG S,LIU X,YUN S,et al.SiO2/TiO2 composite aerogels:preparation via ambient pressure drying and photocatalytic performance[J].Ceramics International,2014,40(9):13781-13786.
 SHAO G N,HILONGA A,JEON S J,et al.Influence of titania content on the mesostructure of titania-silica composites and their photocatalytic activity[J].Powder Technology,2013,233:123-130.
 SING K S W,EVERETT D H,HAUL R A W,et al.Physical and biophysical chemistry division commission on colloid and surface chemistry including catalysis[J].Pure and Applied Chemistry,1985,57(4):603-619.
 KWON Y G,CHOI S Y,KANG E S,et al.Ambient-dried silica aerogel doped with TiO2 powder for thermal insulation[J].Journal of Materials Science,2000,35(24):6075-6079.
 赵斌,林琳,陈超,等.焙烧处理下二氧化钛/钛酸盐纳米材料晶型和形貌的变化规律研究[J].化学学报,2012,71(1):93-101. ZHAO B,LIN L,CHEN C,et al.Research on the phase transition and morphological evolution behaviors of titania/titanate nanomaterials by calcination treatment[J].Acta Chimica Sinica,2012,71(1):93-101.
 KUMAR S R,SURESH C,VASUDEVAN A K,et al.Phase transformation in sol-gel titania containing silica[J].Materials Letters,1999,38(3):161-166.