纳米光催化多孔隙混凝土对二氧化氮净化效果研究  

Nanometer Photocatalysis Porous Concrete Research on Nitrogen Dioxide Purification Effect

作　　者：唐洁[1] 张衍林[1] 

机构地区：[1]重庆水利电力职业技术学院,重庆永川402160

出　　处：《公路工程》2016年第2期118-122,156,共6页Highway Engineering

基　　金：国家自然科学基金(51208521)

摘　　要：为评估多孔隙水泥混凝土的光催化,使用二氧化钛(Ti O2)作为光催化材料,并在3种波长强度的紫外线下,应用二氧化硅作为界面材料以评估水洗前后的光降解率。试验结果显明,高强度UV光,可加速光催化反应的速率。且多孔隙混凝土与一般混凝土相比,不论水洗前与水洗后的比较,都能提高更有效的二氧化氮(NO2)降解率。而该结构为较高的孔隙率、较大的比表面积、合适的骨料与水泥之比(A/C),伴随较弱的结构强度和适宜的光催化层次。依分析结果显示:A/C比为4.32、渗透系数为0.172 8 cm/s、平均磨损率为26.9%、密度为1 895kg/m3且孔隙率为20%时,可以得到最佳空气净化程度的纳米光催化多孔混凝土。In this study,to assess the photocatalytic porous concrete,the use of titanium dioxide（ Ti O2） as a photocatalytic material,and at three wavelengths of UV intensity,the application of silicon dioxide as the interface material to assess the degradation rate of the light before and after washing. The test results revealed high intensity UV light can accelerate the rate of photocatalytic reaction. Porous concrete and concrete as compared with the general,regardless of the comparison prior to washing and after washing,can more effectively improve the nitrogen dioxide（ NO2） degradation rate. And the structure is relatively high porosity,large specific surface area,the appropriate aggregate to cement ratio（ A / C）,accompanied by a weaker structural strength and appropriate photocatalytic layers. By analysis revealed：A / C ratio was 4. 32,the permeability coefficient of 0. 172 8 cm / sec,the average wear rate of 26. 9%,a density of 1 895 kg / m^3 and a porosity of 20%,it is possible to obtain the optimum degree of air purification nm light catalytic porous concrete.

关 键 词：多孔混凝土 光催化 二氧化氮 净化 

分 类 号：U414.1[交通运输工程—道路与铁道工程]