Photocatalytic concrete for NOx abatement: Supported TiO2 efficiencies and impacts
Photocatalytic concrete for NOx abatement: Supported TiO2 efficiencies and impacts
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DOI：
10.1016/j.cemconres.2018.11.002
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发表时间：
2019-02
影响因子：
11.4
通讯作者：
Lu Yang;A. Hakki;Li Zheng;M. R. Jones;Fazhou Wang;D. Macphee
中科院分区：
文献类型：
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作者：
Lu Yang;A. Hakki;Li Zheng;M. R. Jones;Fazhou Wang;D. Macphee
科学文献中已经证明二氧化钛基光催化剂在减轻环境污染物影响方面的潜力，但尽管目前全球对城市氮氧化物污染感到担忧，但光催化混凝土的大规模应用仍然有限。需要提高成本效益来增强光催化剂改性基础设施的情况，这必须解决催化剂效率、催化剂负载和性能耐久性问题。本文比较了砂浆表面负载型 TiO2 与砂浆中分散的传统 TiO2 的光催化效率。以光子效率为指标，研究了NO浓度和流量、UVA光强度和相对湿度等环境条件对光催化性能的影响。负载型 TiO2 显示出更大的 NOx 降解率 (De-NOx)，比分散在砂浆中的 TiO2 粉末高约 9 倍，约 100%。与传统光触媒砂浆中TiO2（负载量5%）相比，利用率提高150倍。
The potential of TiO2-based photocatalysts in mitigating the effects of environmental pollutants is evident in the scientific literature but the large-scale implementation of photocatalytic concretes still appears limited, despite the current global concerns over urban NOx pollution. Improvements in cost-effectiveness are required to enhance the case for a photocatalyst-modified infrastructure and this must address catalyst efficiency, catalyst loading and performance durability. This paper compares photocatalytic efficiencies of supported TiO2on mortar surfaces with the more conventional TiO2dispersed in mortar. The influences of environmental conditions, such as NO concentration and flow rate, UVA light intensity and relative humidity, on photocatalytic performance are also investigated using photonic efficiency as an indicator. The supported TiO2shows greater degradation of NOx (De-NOx), at about 9 times higher than TiO2powder dispersed in the mortar, ca. 150 times higher utilization efficiency, than that of TiO2in traditional photocatalytic mortar (with 5% loading).