Abstract The photocatalytic mixed crystal nano-TiO2 particles were incorporated with concrete by means of the internal doping method (IDM) and spraying method (SPM) in this paper. To evaluate the photocatalytic degradation efficiency of mixed crystal nano-TiO2 concrete, the methyl orange (MO) was chosen to simulate pollutants. The physicochemical characteristics and photocatalytic performance of mixed crystal nano-TiO2 concrete prepared by above two different methods were experimentally investigated under UV irradiation and solar irradiation. Furthermore, the effects of two key influential factors including pollutant concentration and irradiation condition were also analyzed and discussed. Experimental results indicate that the nano-TiO2 concrete prepared by the spraying method (SPM) exhibits maximum photocatalytic degradation efficiency of 73.82% when the sprayed nano-TiO2 slurry concentration is 10mg/L. The photocatalytic degradation efficiency of unpolished nano-TiO2 concrete is much higher than that of polished nano-TiO2 concrete under the same exposure time of UV irradiation. Moreover, the photocatalytic degradation efficiency of nano-TiO2 concrete decreases with the increase of pollutant concentration. The irradiation condition has an obvious influence on the photocatalytic degradation efficiency of nano-TiO2 concrete. In the aspect of applications, the practical recommendations for the nano-TiO2 concrete with self-cleaning capacity were presented according to the experimental results.

中文翻译：

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混晶纳米TiO2混凝土光催化降解效率试验研究

摘要 本文采用内掺杂法（IDM）和喷涂法（SPM）将光催化混晶纳米TiO2颗粒掺入混凝土中。为了评估混晶纳米TiO2混凝土的光催化降解效率，选择甲基橙（MO）来模拟污染物。对上述两种不同方法制备的混晶纳米TiO2混凝土在紫外光照射和太阳光照射下的理化特性和光催化性能进行了实验研究。此外，还分析和讨论了污染物浓度和辐照条件这两个关键影响因素的影响。实验结果表明，采用喷涂法（SPM）制备的纳米TiO2混凝土的最大光催化降解效率为73。喷涂纳米TiO2浆液浓度为10mg/L时为82%。在相同的紫外线照射时间下，未抛光纳米TiO2混凝土的光催化降解效率远高于抛光纳米TiO2混凝土。此外，纳米TiO2混凝土的光催化降解效率随着污染物浓度的增加而降低。辐照条件对纳米TiO2混凝土的光催化降解效率有明显影响。在应用方面，根据实验结果提出了具有自洁能力的纳米TiO2混凝土的实用建议。在相同的紫外线照射时间下，未抛光纳米TiO2混凝土的光催化降解效率远高于抛光纳米TiO2混凝土。此外，纳米TiO2混凝土的光催化降解效率随着污染物浓度的增加而降低。辐照条件对纳米TiO2混凝土的光催化降解效率有明显影响。在应用方面，根据实验结果提出了具有自洁能力的纳米TiO2混凝土的实用建议。在相同的紫外线照射时间下，未抛光纳米TiO2混凝土的光催化降解效率远高于抛光纳米TiO2混凝土。此外，纳米TiO2混凝土的光催化降解效率随着污染物浓度的增加而降低。辐照条件对纳米TiO2混凝土的光催化降解效率有明显影响。在应用方面，根据实验结果提出了具有自洁能力的纳米TiO2混凝土的实用建议。辐照条件对纳米TiO2混凝土的光催化降解效率有明显影响。在应用方面，根据实验结果提出了具有自洁能力的纳米TiO2混凝土的实用建议。辐照条件对纳米TiO2混凝土的光催化降解效率有明显影响。在应用方面，根据实验结果提出了具有自洁能力的纳米TiO2混凝土的实用建议。