空气污染诱发癌症，威胁人类生存。光催化水泥基材料在解决日益严重的城市空气污染问题方面潜力巨大。分散纳米TiO2并构建易于光传输及污染物扩散的表层结构，是提高光催化效能的关键。本项目利用层状硅铝酸盐(SAL)层间域，构建纳米反应器组装TiO2(TiO2/SAL)，实现TiO2的固相分散与光催化“微环境”纳米孔结构设计的集成；建立固相“组装-分散”及液相“吸附-分散”模型，突破纳米TiO2固相团聚、液相聚集的瓶颈；基于TiO2/SAL“本体”及水泥基材料“主体”孔结构的优化，构建高效能光催化“微环境”，解决光传输难、污染物吸附慢、TiO2易失活的问题；将TiO2/SAL水泥基材料构筑于基体表层，研究光催化效能的影响因素，分析失活机理，建立再生机制。项目旨在建立基于表面重构的层状硅铝酸盐组装纳米TiO2光催化水泥基材料的设计方法，奠定纳米TiO2光催化水泥基材料与结构设计的理论基础。

Air pollution induces the cancer and threatens human survival. Photocatalytic cement-based materials (PCBM) have enormous potential in purification of the increasingly serious pollution air. The dispersion of nano-TiO2 particles and the formation of the surface structure for highly efficient optical transmission and pollutant adsorption are the key factor for the improvement in photocatalytic efficiency. In this study, interlayer space of silicon-aluminum layer (SAL) would be employed to establish the nano-reactor to assemble and disperse the nano-TiO2, which would combine the solid dispersion of TiO2 and the nano-porous structure of photocatalytic ‘microenvironment’ together. ‘Assembling-dispersion’ model and ‘adsorption-dispersion’ model would be established to discuss interaction between organic-inorganic dispersants and TiO2/SAL particles, overcoming the problem of dispersing TiO2 in fresh cement paste. Based on the optimization design on the porous structure of TiO2/SAL and PCBM, highly efficient photocatalytic microenvironment with multi-scale pore structure and large specific surface would be set up to enhance the efficiency of light transmission, adsorbing speed of pollutants and photocatalytic efficiency. Furthermore, influencing factors on photocatalytic performance would be studied, and the deactivation mechanism would also be analyzed to proposal the regeneration process. Finally, the design method of PCBM would be obtained as a theoretical foundation for the design and application of this kind of cement-based material.