Design and preparation of TiO2-based environmentally stable photocatalytic self-cleaning coatings
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摘要: 将光催化活性与超疏水性相结合,一方面,涂层利用表面超疏水作用能够将污染物通过水珠带走;另一方面,光催化作用能够对有机污染物进行降解,同时维持材料的超疏水特性。通过洞渣制石英砂(Quartz Sand)协同TiO2构筑微纳米粗糙结构,以聚甲基氢硅氧烷(PMHS)和钛酸四丁酯(TBT)作为低表面能物质,制备了坚固耐磨的PMHS/TBT-Quartz Sand-TiO2光催化自清洁成膜涂层。结果表明,涂层接触角为 154.4°,滚动角小于 10°。TiO2有效地负载到石英砂表面,构造了优异的微纳米粗糙结构。涂层具有优良的光催化活性,可降解表面有机物小分子去除空气中的氮氧化物。此外,涂层在经过连续摩擦损伤、长期紫外暴露、冻融循环等不同的破坏形式后,仍能保持环境稳定性。Abstract: Combining photocatalytic activity with superhydrophobicity, on the one hand, the surface superhydrophobicity can be utilized to carry away pollutants through water droplets, and on the other hand, photocatalysis can degrade organic pollutants and maintain the superhydrophobicity of the materials. A robust and wear-resistant PMHS/TBT-Quartz Sand-TiO2 photocatalytic self-cleaning film-forming coating was prepared by constructing a micro- and nano-scrubber structure with Quartz Sand made from cave slag in synergy with TiO2, and using poly(methylhydrosiloxane) (PMHS) and tetrabutyl titanate (TBT) as the low-surface-energy substances. The results show that the contact angle of the coating is 154.4°, and the rolling angle is less than 10°. TiO2 is effectively loaded onto the surface of quartz sand, and an excellent micro and nano rough structure is constructed. The coating has excellent photocatalytic activity, which can degrade small organic molecules on the surface to remove nitrogen oxides in the air. In addition, the coating remains environmentally stable after continuous friction damage, long-term UV exposure, freeze-thaw cycles and other forms of damage.
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Key words:
- superhydrophobic /
- photocatalysis /
- micro-nano rough structure /
- self-cleaning /
- composite coating
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表 1 砂浆配合比
Table 1. Mortar mix ratio
/(kg·m−3) Water cement ratio Cement Sand Water 0.46 450 1350 225 -
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