School of Resources, Environment and Materials, Guangxi University, No.100, Daxue East Road, Nanning, 530004, China; Key Laboratory of Environmental Protection, Guangxi University, No.100, Daxue East Road, Nanning, 530004, China.
School of Resources, Environment and Materials, Guangxi University, No.100, Daxue East Road, Nanning, 530004, China; Key Laboratory of Environmental Protection, Guangxi University, No.100, Daxue East Road, Nanning, 530004, China.
Chemosphere. 2023 Sep;336:139316. doi: 10.1016/j.chemosphere.2023.139316. Epub 2023 Jun 23.
The practical application of photocatalytic coating has been greatly challenged in terms of its long-term effective natural light photocatalytic degradation due to its vulnerability and easy contamination caused by poor self-cleaning properties. In this work, photocatalytic coating with self-cleaning properties was prepared by spraying fluorinated dual-scale TiO on the inorganic lithium silicate adhesive, enabling excellent durability and long-term effective photocatalytic degradation performance under natural light. The coating exhibits superhydrophobic properties even after abrasion testing, acid and alkali immersion testing, and UV aging, laying a foundation for the practical use. Moreover, the coating can be applied to various substrates and its excellent self-cleaning properties make it resistant to particulate and liquid contamination that may occur in the environment. Besides, we evaluated the photocatalytic stability of the coating by subjecting it to acidic and alkaline environments and high pollution concentrations. Furthermore, benefiting from the synergistic effect of photocatalytic and self-cleaning properties, the coating achieves long-term effective photocatalytic degradation of dye wastewater under natural light, which still has a high removal rate of 95.8% for methylene blue even after 30 cycles of use. Meanwhile, due to the coating's excellent durability, the long-term quality loss rate of the coating still remained below 0.3%, which avoids the risk of secondary environmental pollution caused by nanoparticle leakage. Therefore, these excellent properties enable the coating to have a broad range of application prospects for the treatment of pollutants in water.
光催化涂层的实际应用因其自清洁性能差导致的脆弱性和易污染而受到极大挑战，无法长期有效地在自然光下进行光催化降解。在这项工作中，通过在无机硅酸锂胶上喷涂氟化双尺度 TiO2，制备出具有自清洁性能的光催化涂层，使其在自然光下具有优异的耐久性和长期有效的光催化降解性能。即使经过磨损测试、酸碱浸泡测试和 UV 老化测试，涂层仍具有超疏水性能，为实际应用奠定了基础。此外，该涂层可以应用于各种基底，其优异的自清洁性能使其能够抵抗环境中可能存在的颗粒和液体污染。此外，我们通过在酸性和碱性环境以及高污染浓度下评估涂层的光催化稳定性。此外，得益于光催化和自清洁性能的协同作用，该涂层在自然光下实现了对染料废水的长期有效光催化降解，即使经过 30 次使用循环，对亚甲基蓝的去除率仍高达 95.8%。同时，由于涂层具有优异的耐久性，涂层的长期质量损失率仍保持在 0.3%以下，避免了因纳米颗粒泄漏而导致的二次环境污染风险。因此，这些优异的性能使该涂层在水污染物处理方面具有广泛的应用前景。
