水泥基建筑材料量大面广,改善其表层质量并赋予其光催化功能可延长材料服役寿命并有效改善环境质量.利用Stober法在商用纳米TiO2表面合成纳米SiO2,制备TiO2@SiO2核壳纳米材料,在对其光催化性能进行表征的基础上用于硬化水泥砂浆表面处理,利用高火山灰反应活性的纳米SiO2与硬化水泥砂浆表层反应,提高TiO2光催化材料在水泥基材料表层的有效附着,并提高表层水泥基材料性能.结果显示,TiO2@SiO2对有机染料的光催化降解效能比商用P25约高20％,经TiO2@SiO2处理的硬化水泥砂浆的吸水率较空白样品降低约10％.研究表明,TiO2@SiO2在赋予水泥基材料表面光催化能力的同时,具有提高水泥基建筑材料表层质量和耐久性的潜能,为该材料表面功能化改性提供了新思路.%The concrete is widely used in the world.It is known that improvement of the surface quality of the concrete structure,as well as making its surface photocatalytic can extend the service life of concrete and improve the environmental quality.In this paper,nano-SiO2 prepared on the surface of commercial nano-TiO2 by the Stober method was used to make TiO2@SiO2 core-shell nanomaterials.Based on the characterization of the photocatalytic property,the TiO2@SiO2 was applied to the surface treatment of hardened cement mortar with the goal of improving the surface quality of cement mortar by taking the advantage of the chemical reaction of the high pozzolanic reactive nano-SiO2 and the matrix of cement mortar.The results showed that the photocatalytic degradation rate of TiO2@SiO2 was 20％ higher than that of commercial P25.Compared with the blank cement sample,TiO2@SiO2 reduced the water absorption by about 10 ％.The core-shell nanomaterials can make the cement-based materials photocatalytic,and as well as improve the surface quality and the durability of hardened cement-based materials,which provides a new way of the functionalization of cement-based building materials.
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