The formation of a robust photocatalytic hydrophobic hybrid coating on a polymer substrate via a simple process, such as dip-coating, is useful for practical applications but still challenging. In this study, the photocatalytic coating is prepared by nano-TiO₂ hydrosol and polydimethylsiloxane (PDMS), which has both photocatalytic and hydrophobic properties. The as-prepared TiO₂/PDMS coating can be applied on silicon rubber directly via a dipping process. FTIR, XPS, and HRTEM analysis showed that the interaction between PDMS and nano-TiO₂ occurred via generated Ti-O-Si bonds. The photocatalytic activity test performs that this coating can remove organic pollutants methylene blue (MB) dissolved in the water. Meanwhile, the coating can degrade the organic dye stained on the silicon rubber surface under UV irradiation. The water contact angle test shows that the hydrophobicity of the TiO₂/PDMS coating is stable under UV irradiation for over 60 h, which means the existence of TiO₂ will not break the PDMS in the hybrid coating. Also, the hybrid coating can keep both hydrophobicity and photocatalytic activity even after pre-irradiation treatment. These results show that the as-fabricated hybrid coating has promising applications for functionalizing silicone rubber surfaces to endow them with photocatalytic activity to degrade organic pollutants on surfaces both in ambient and aqueous environments, and the hybrid coating has potential stable self-cleaning function.

通过简单的工艺（例如浸涂）在聚合物基材上形成坚固的光催化疏水杂化涂层对于实际应用很有用，但仍然具有挑战性。在这项研究中，光催化涂层由纳米TiO ₂水溶胶和聚二甲基硅氧烷（PDMS）制备，具有光催化和疏水性能。所制备的 TiO ₂ /PDMS 涂层可以通过浸渍工艺直接涂覆在硅橡胶上。FTIR、XPS 和 HRTEM 分析表明，PDMS 和纳米 TiO ₂之间的相互作用是通过生成的 Ti-O-Si 键发生的。光催化活性测试表明该涂层可以去除有机污染物亚甲蓝（MB) 溶解在水中。同时，该涂层在紫外线照射下可以降解硅橡胶表面染色的有机染料。水接触角测试表明，TiO ₂ /PDMS涂层的疏水性在紫外线照射下超过60小时是稳定的，这意味着TiO ₂的存在不会破坏杂化涂层中的PDMS。此外，即使经过预辐照处理，混合涂层也可以保持疏水性和光催化活性。这些结果表明，制备的混合涂层在硅橡胶表面功能化方面具有广阔的应用前景，使其具有光催化活性，可降解环境和水环境中表面的有机污染物，并且混合涂层具有潜在的稳定自清洁功能。