CAJ | 학술논문

以钛酸四丁酯为源，采用苯胺-丙酮原位生成水溶胶-凝胶法，在乙醇超临界干燥过程中用部分水解的钛醇盐和硅醇盐对TiO2凝胶进行超临界修饰制备了具有核/壳纳米结构的块体TiO2/SiO2复合气凝胶.制备的复合气凝胶具有优异的机械性能，其杨氏模量可达4.5 MPa.复合气凝胶同时具有极好的高温热稳定性.经过1000°C热处理后，线性收缩由纯TiO2气凝胶的31%降至复合气凝胶的10%，且比表面积由纯TiO2气凝胶的31 m2?g-1提升至复合气凝胶的143 m2?g-1.此外，该复合气凝胶经1000°C热处理后具有优异的光催化降解亚甲基蓝的性能.其优异的光催化性能得益于TiO2/SiO2复合气凝胶1000°C处理后高的比表面积和小的颗粒尺寸.优良的耐热性能、力学性能和光催化性能使获得的具有核/壳纳米结构的TiO2/SiO2复合气凝胶在光催化领域具有良好的应用前景.
이태산사정지위원，채용분알-병동원위생성수용효-응효법，재을순초림계간조과정중용부분수해적태순염화규순염대TiO2응효진행초림계수식제비료구유핵/각납미결구적괴체TiO2/SiO2복합기응효.제비적복합기응효구유우이적궤계성능，기양씨모량가체4.5 MPa.복합기응효동시구유겁호적고온열은정성.경과1000°C열처리후，선성수축유순TiO2기응효적31%강지복합기응효적10%，차비표면적유순TiO2기응효적31 m2?g-1제승지복합기응효적143 m2?g-1.차외，해복합기응효경1000°C열처리후구유우이적광최화강해아갑기람적성능.기우이적광최화성능득익우TiO2/SiO2복합기응효1000°C처리후고적비표면적화소적과립척촌.우량적내열성능、역학성능화광최화성능사획득적구유핵/각납미결구적TiO2/SiO2복합기응효재광최화영역구유량호적응용전경.
Core/shel nanostructured monolithic TiO2/SiO2 composite aerogels were prepared by the aniline-acetone in situ water formation sol-gel method. Titanium(IV) n-butoxide was used as a precursor fol owed by supercritical modification with partial y hydrolyzed titanium alkoxide and tetraethoxysilane during ethanol supercritical fluid drying. The obtained composite aerogel showed excel ent mechanical strength with a Young′s modulus of 4.5 MPa. The composite aerogel exhibited excel ent heat resistance. After heat treatment at 1000 °C its linear shrinkage decreased from 31%for the TiO2 aerogel to 10%for the composite aerogel. The specific surface area increased from 31 m2?g-1 for the TiO2 aerogel to 143 m2?g-1 for the composite aerogel. The composite aerogel exhibited excel ent photocatalytic performance during the degradation of methylene blue after heat treatment at 1000 °C. Its excel ent photocatalytic property is attributed to its high specific surface area and the smal particle size of the composite aerogel after heat treatment at 1000 ° C. The enhanced heat resistance, mechanical strength, and photocatalytic performance makes the obtained core/shel nanostructured TiO2/SiO2 composite aerogel a promising candidate for photocatalytic applications.