CAJ | 학술논문

以廉价的四氯化钛和工业水玻璃为原料,通过溶胶-凝胶法制得TiO_2-SiO_2复合湿凝胶,用三甲基氯硅烷(TMCS)/乙醇(EtOH)/正己烷(Hexane)混合溶液对湿凝胶进行改性,常压干燥制备了TiO_2-SiO_2复合气凝胶.利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、红外光谱(FTIR)、X射线衍射(XRD)及N_2吸附/脱附法对复合气凝胶的形貌和性质进行了分析.结果表明,TiO_2-SiO_2复合气凝胶具有连续多孔结构,150℃干燥后复合气凝胶的比表面积为1 076 m~2·g~(-1),孔体积为4.96 cm~3·g~(-1);经550 ℃热处理后,复合气凝胶仍然具有高的孔隙率,比表面积为856 m~2·g~(-1),孔体积为3.46 cm~3·g~(-1).吸附和光催化降解罗丹明B的结果表明,复合气凝胶同时具有较好的吸附和光催化性能,其吸附/光催化协同作用活性优于纯SiO_2气凝胶和锐钛矿TiO_2粉末;且重复利用四次降解率仍然可达到89%.
이렴개적사록화태화공업수파리위원료,통과용효-응효법제득TiO_2-SiO_2복합습응효,용삼갑기록규완(TMCS)/을순(EtOH)/정기완(Hexane)혼합용액대습응효진행개성,상압간조제비료TiO_2-SiO_2복합기응효.이용소묘전자현미경(SEM)、투사전자현미경(TEM)、홍외광보(FTIR)、X사선연사(XRD)급N_2흡부/탈부법대복합기응효적형모화성질진행료분석.결과표명,TiO_2-SiO_2복합기응효구유련속다공결구,150℃간조후복합기응효적비표면적위1 076 m~2·g~(-1),공체적위4.96 cm~3·g~(-1);경550 ℃열처리후,복합기응효잉연구유고적공극솔,비표면적위856 m~2·g~(-1),공체적위3.46 cm~3·g~(-1).흡부화광최화강해라단명B적결과표명,복합기응효동시구유교호적흡부화광최화성능,기흡부/광최화협동작용활성우우순SiO_2기응효화예태광TiO_2분말;차중복이용사차강해솔잉연가체도89%.
Using cheap titanium tetrachloride and industrial waterglass as raw materials, TiO_2-SiO_2 composite aerogels were prepared via an ambient pressure drying process, by using Trimethylchlorosilane /Ethanol/Hexane solution to modify the sol-gel-derived TiO_2-SiO_2 wet gel. The morphology and properties of the aerogels were characterized by SEM, TEM, FTIR, XRD and N_2 adsorption-desorption measurement. The results indicate that the obtained TiO_2-SiO_2 composite aerogels exhibit a porous structure, with a specific surface area of 1 076 m~2·g~(-1) and pore volume of 4.96 cm~3·g~(-1) after dried at 150 ℃. Moreover, the composite aerogels still show high porosity after calcined at 550 ℃, with a specific surface area of 856 m~2·g~(-1) and pore volume of 3.46 cm~3·g~(-1). The results of adsorption and photocatalytic degradation of rhodamine B show that TiO_2-SiO_2 composite aerogels have both good adsorption and photocatalytic properties. The synergistic adsorption/photocatalysis activity of TiO_2-SiO_2 composite aerogels was better than pure SiO_2 aerogels and pure anatase TiO_2 powder. Additionally, the adsorption/ photocatalytic degradation rate is still up to 89% after being used for four times.