Nano-Photocatalyst Porous Concrete for Nitrogen Dioxide Removal

奈米光觸媒多孔隙混凝土於二氧化氮淨化之研究

楊錦懷(Chin-Huai Young) ； 黃錦煒(Chin-Wei Huang) ； 林綉禎(Hsiu-Chen Lin)

《中國土木水利工程學刊》 26卷1期 (2014/03) Pp. 1-11

https://doi.org/10.6652/JoCICHE.201403_26(1).0001

摘要

本研究中為評估多孔隙水泥混凝土的光催化，使用二氧化鈦（TiO_2）作為光催化材料，並在三種波長強度的紫外線下，應用二氧化矽作為界面材料以評估水洗前後的光降解率。試驗結果顯明，高強度UV光，可加速光催化反應的速率。且多孔隙混凝土與一般混凝土相比，不論水洗前與水洗後的比較，都能提高更有效的二氧化氮（NO_2）降解率。而該結構為較高的孔隙率、較大的比表面積、合適的骨料與水泥之比（A／C），伴隨較弱的結構強度和適宜的光觸媒層次。依分析結果顯示：A／C比為4.32、滲透係數為0.1728cm／sec、平均磨損率為26.9%、單位重為1,895 kg/m3且孔隙率為20.1%時，可以得到最佳空氣淨化程度的奈米光觸媒多孔混凝土。

關鍵字

多孔隙混凝土 ； 奈米光觸媒 ； 二氧化鈦 ； 二氧化氮

並列摘要

To evaluate the photocatalysis of porous Portland cement concrete, using titanium dioxide (TiO_2) as a photocatalyst material, three UV light intensities were employed, using SiO_2 as the interface to determine the recovery efficiency pre- and post-rinsing. The test results revealed that high-intensity UV lamps can accelerate the rate of photocatalysis. which is more efficient in porous photocatalytic concrete compared with general photocatalytic concrete. The porous concrete yields a higher nitrogen dioxide (NO_2) degradation rate prior to rinsing compared with that of post-rinsing. Higher porosity levels were associated with decreased slurry, a large specific surface area, appropriate aggregate to cement ratio (A/C), weak structural strength, and high photocatalyst content. A statistical analysis showed that the nano-photocatalyst porous concrete that possessed an A/C ratio of 4.32 demonstrated the optimal air-purification, demonstrating a permeability coefficient of 0.1728 cm/s, average wear rate of 26.9%, unit weight of 1,895 kg/m^3, and a porosity of 20.1%.

並列關鍵字

porous concrete ； nano-photocatalyst ； TiO_2 ； NO_2