We investigated the photocatalytic activity of TiO nanoparticles (TiO-NPs) and TiO nanotubes (TiO-NTs) supported on a floating polyurethane (PU) foam for removing Bisphenol A (BPA) as a model pollutant. We fabricated TiO-NPs by the sol-gel method and TiO-NTs by the ultrasound-assisted hydrothermal method. Subsequently, the photocatalysts were immobilized onto the PU foam through the wet chemical deposition process. The synthesized photocatalysts were characterized by contact angle, SEM-EDS, TEM, XRD, DRS, and BET analyses. TiO-NPs and TiO-NTs were successfully deposited onto the PU foam, creating floating photocatalysts denoted as TiO-NPs@PU and TiO-NTs@PU. Our findings indicated that the nanotubular structure of floating TiO photocatalysts enhanced the removal efficiency of BPA relative to the nanoparticles, resulting in the complete removal of the pollutant over 180 min of simulated sunlight irradiation. TiO-NTs@PU was also stable after five reuse cycles. Moreover, h was the main scavenging reactive species during the photocatalysis of BPA with TiO-NTs@PU.

中文翻译：

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固定在聚氨酯泡沫上的 TiO2 纳米管作为水处理的漂浮光催化剂

我们研究了负载在浮动聚氨酯 (PU) 泡沫上的 TiO2 纳米颗粒 (TiO-NPs) 和 TiO2 纳米管 (TiO-NTs) 的光催化活性，以去除双酚 A (BPA) 作为模型污染物。我们通过溶胶-凝胶法制备了 TiO-NPs，通过超声辅助水热法制备了 TiO-NTs。随后，通过湿化学沉积工艺将光催化剂固定在聚氨酯泡沫上。通过接触角、SEM-EDS、TEM、XRD、DRS 和 BET 分析对合成的光催化剂进行了表征。 TiO-NPs 和 TiO-NTs 成功沉积在 PU 泡沫上，形成漂浮光催化剂，表示为 TiO-NPs@PU 和 TiO-NTs@PU。我们的研究结果表明，漂浮 TiO2 光催化剂的纳米管结构相对于纳米颗粒提高了 BPA 的去除效率，在模拟阳光照射下 180 分钟内完全去除了污染物。 TiO-NTs@PU 在五个重复使用周期后也很稳定。此外，h是TiO-NTs@PU光催化BPA过程中的主要清除活性物质。