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TiO_2-based self-compacting glass mortar: Comparison of photocatalytic nitrogen oxide removal and bacteria inactivation

机译：TiO_2基自密实玻璃砂浆：光催化氮氧化物去除和细菌灭活的比较

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This paper presents the results of a preliminary study on assessing the photocatalytic activities when nano-TiO_2 is intermixed in self-compacting glass mortars (SCGM) in terms of the air pollutant removal and bacteria inactivation. Nitrogen oxide (NO) and Escherichia coli K12 were used as the target air pollutant and bacteria test strain respectively. In addition, the influence of nano-TiO_2 dosage (0%, 2% and 5%) and recycled glass colour (light green and transparent) on the fluidity and compressive strength of nano-TiO_2-based SCGM was also evaluated. The results showed that more superplasticizer dosage was required to help the dispersion of nano-TiO_2 particles to achieve the same fluidity. Meanwhile, with the addition of nano-TiO_2 either 2% or 5%, about a 12% compressive strength increment was observed in SCGM. In the case of NO removal, an increasing trend of NO removal was accompanied by an increase in T1O_2 content. For a given dosage of TiO_2, the SCGM prepared with transparent recycled glass showed a slightly higher NO removal rate than that prepared with light green recycled glass. As for the antibacterial activity, however, all of the T1O_2 intermixed SCGMs showed little inactivation ability of £ coli. Taking into account the above obtained results, it can be concluded that compared with NO removal. photocatalytic bacteria inactivation is a more complex process and the results for photocatalytic activity of NO removal cannot alwavs be extraDolated to Dhotocatalvtic antibacterial activity.
机译：本文介绍了初步研究的结果，该研究从空气污染物去除和细菌灭活方面评估了纳米TiO_2与自密实玻璃砂浆（SCGM）混合时的光催化活性。氮氧化物（NO）和大肠杆菌K12分别用作目标空气污染物和细菌测试菌株。此外，还评估了纳米TiO_2用量（0％，2％和5％）和再生玻璃颜色（浅绿色和透明色）对纳米TiO_2基SCGM的流动性和抗压强度的影响。结果表明，需要更多的高效减水剂用量以帮助纳米TiO_2分散以达到相同的流动性。同时，添加2％或5％的纳米TiO_2，在SCGM中观察到约12％的抗压强度增加。在NO去除的情况下，NO去除的增加趋势伴随着TiO 2含量的增加。对于给定的TiO_2剂量，用透明再生玻璃制备的SCGM的脱氮率略高于用浅绿色再生玻璃制备的SCGM。然而，就抗菌活性而言，所有T1O_2混合SCGM几乎没有表现出大肠杆菌的灭活能力。考虑到以上获得的结果，可以得出结论，与去除NO相比。光催化细菌的失活是一个更复杂的过程，并且去除NO的光催化活性的结果始终不能与光催化抗菌活性有关。

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