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混凝土与制品
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纳米TiO2光催化混凝土的制备及性能研究

作者：李晶晶1，2

关键字：纳米,TiO2,光,催化,混凝土,的,制备,及,性能,

　
（1.陕西交通职业技术学院 公路与铁道工程学院，陕西 西安  710018；
2.长安大学 公路学院，陕西 西安  710064）
    摘要：利用行星球磨技术制得Fe3+掺杂改性纳米TiO2，分别将纳米TiO2和改性纳米TiO2掺入混凝土中制备光催化混凝土试件，测试其力学强度、抗冻性能和光催化性能，并从微观角度分析改性纳米TiO2光催化混凝土的作用机理。结果表明：纳米TiO2混凝土和改性纳米TiO2混凝土力学强度均高于基准混凝土；随着纳米TiO2掺量的增加，2种光催化混凝土的质量变化率均呈先减小后增大的趋势；改性纳米TiO2混凝土的光催化降解速率比纳米TiO2快11%~20%；微观形貌和能谱分析显示，改性纳米TiO2可以有效填充水化产物的裂缝和孔隙，优化界面过渡区结构，提高混凝土的密实性和光催化能力。综合考虑各项性能和经济性，推荐改性纳米TiO2的最佳掺量为5%。
    关键词：混凝土；纳米TiO2；力学强度；光催化性能
    中图分类号：TU528        文献标识码：A        文章编号：1001-702X（2022）05-0075-05
 
Preparation and properties of Nano-TiO2 photocatalytic concrete
LI Jingjing1，2
（1.School of Highway and Railway Engineering，Shaanxi College of Communication Technology，Xi'an 710018，China；
2.School of Highway，Chang'an University，Xi'an 710064，China）
    Abstract：Fe3+ doped mano-TiO2 was prepared by planetany ball milling techaology. Nano-TiO2 and modified TiO2 were added into concrete to prepare photocatalytic concrete specimens，the mechanical strength，frost resistance and photocatalytic properties of the specimens were tested. The mechanism of the modified nano-TiO2 photocatalytic concrete was analyzed from the microscopic point of view. The results show that the mechanical strength of the original and modified nano-TiO2 concrete are higher than those of benchmark concrete. With the increase of the content of nano-TiO2 material，the mass change rate of two photocatalytic concretes showed a trend of first decreasing and then increasing. The photocatalytic degradation rate of modified nano-TiO2 concrete is about 11%~20% faster than that of original nano-TiO2. The microscopic morphology and energy spectrum analysis show that the modified nano-TiO2 can not only effectively fill the cracks or pores of hydration products，but also optimize the structure of the interface transition zone. As a result，the compactness and photocatalytic ability of concrete are improved. Considering various performance and economy，it is recommended that the optimal content of modified nano-TiO2 is 5%.
    Key words：concrete，nanometer titanium dioxide，mechanical strength，photocatalytic performance