二氧化钛纳米颗粒改性自洁净混凝土的制备研究

Preparation of titanium dioxide nano particle modified photocatalytic self-cleaning concrete

自洁净混凝土可以减少空气污染物从而达到净化城市的效果。利用具有纳米特性的水泥水化产物C-S-H凝胶和具有光催化作用的TiO_2纳米颗粒制备超平表面的光催化混凝土,结果表明:所制备的混凝土表面被C-S-H凝胶和粒径为几十纳米的TiO_2颗粒覆盖,其粗糙度在3.5 nm^11 nm之间,并且光催化超平表面混凝土可以有效光解亚甲蓝。由于该种混凝土具有超平表面和光催化特性,污染物可以很容易地被雨水清洗掉,所以这种新型混凝土有望作为自洁净装饰材料用于城市建筑。

The self-cleaning concrete is a potential approach to make the city cleaner by reducing the air pollutants.In this study,a photocatalytic concrete with ultra-smooth surface was fabricated with a new approach taking use of the nano granular nature of the main hydration product of cement i.e.Calcium Silicate Hydrates(C-S-H) and the photocatalysis properties of TiO_2nano particles.Results show that the surface of the fabricated concrete was covered by C-S-H and TiO_2nano particles around tens of nm;the surface roughness of the concrete was 3.5-11 nm;the surface of the photocatalytic ultra-smooth concrete can degrade methylene blue(MB)effectively.Due to its ultra-smooth surface and photocatalytic properties,the residue of contaminants will be washed away by the rain,this new type of concrete is promising to be utilized as a self-cleaning finishing material for the urban buildings.