Photocatalytic water treatment has significant potential to disinfect and degrade recalcitrant organic pollutants while minimizing the need to add chemicals, but current approaches have poor energy efficiency due, in part, to inefficient utilization of photo-generated reactive oxygen species (ROS). Organic coatings such as cyclodextrin (CD) can adsorb target contaminants and bring them close to the photocatalyst surface to enhance ROS utilization efficiency, but the coatings themselves are susceptible to ROS attack. Here, we report an ROS-resistant fluorinated CD polymer (CDP) that can both adsorb contaminants and resist degradation by ROS, yielding a more efficient material for “trap and zap” water treatment. We produced the CDP through condensation polymerization of β-cyclodextrin and tetrafluoroterephthalonitrile, resulting in a cross-linked, covalently bound CD film that is much more stable than prior approaches involving physi-sorption. We optimized the coating thickness on TiO₂ microspheres to improve the efficiency of contaminant degradation, and found that increasing the CDP content enhanced BPA adsorption but also occluded photocatalytic sites and hindered photocatalytic degradation. The optimum content of CDP was 5% by weight, and this optimal CDP-TiO₂ composition had a BPA adsorption capacity of 36.9 ± 1.0 mg g⁻¹ compared with 24.1 ± 1.1 mg g⁻¹ for CD-coated TiO₂ (CD-TiO₂) and 21.9 ± 1.5 mg g⁻¹ for bare TiO₂. CDP-TiO₂ exhibited minimal photoactivity loss after 1000 h of repeated use in DI water under UVA irradiation (365 nm, 3.83 × 10⁻⁶ E L⁻¹s⁻¹), and no release of organic carbon from the coating was detected. Photocatalytic treatment using CDP-TiO₂ only showed a small decrease in BPA removal efficiency in secondary effluent after four 3-h cycles, from 80.2% to 71.7%. In contrast, CD-TiO₂ and P25 removed only 29.8% and 6.2% of BPA after 4 cycles, respectively. Altogether, the CDP-TiO₂ microspheres represent promising materials for potential use in photocatalytic water treatment.

光催化水处理具有消毒和降解顽固有机污染物的巨大潜力，同时最大限度地减少了对化学物质的添加需求，但是当前的方法在能源效率方面不佳，部分原因是光生活性氧（ROS）的利用效率低下。有机涂层，例如环糊精（CD）可以吸附目标污染物并使它们靠近光催化剂表面，以提高ROS的利用效率，但是涂层本身很容易受到ROS的侵袭。在这里，我们报告了一种耐ROS的氟化CD聚合物（CDP），它既可以吸附污染物，又可以抵抗ROS降解，从而生产出一种更有效的“捕集”水处理材料。我们通过β-环糊精和四氟对苯二甲腈的缩聚反应生产CDP，从而产生交联的，共价结合的CD膜比以前涉及物理吸附的方法稳定得多。我们优化了TiO上的涂层厚度_2个微球提高了污染物的降解效率，发现增加CDP含量不仅增强了BPA的吸附，而且还阻塞了光催化部位并阻碍了光催化降解。CDP的最佳含量为按重量计5％，并且该最佳CDP-的TiO ₂组合物具有的BPA吸附能力36.9±1.0毫克克^-1与24.1±1.1毫克克，比^-1为CD-涂覆的TiO ₂（CD- TiO ₂）和21.9±1.5 mg g ^-1的裸露TiO ₂。在UVA照射下于去离子水中重复使用1000小时后，CDP-TiO ₂表现出最小的光活性损失（365 nm，3.83×10 ^-6  E L ^-1s ^-1），并且未检测到涂层中有机碳的释放。使用CDP-TiO _2的光催化处理仅显示在四个3小时循环后，次级废水中BPA去除效率的小幅降低，从80.2％降至71.7％。相反，在四个循环后，CD-TiO ₂和P25分别仅去除了29.8％和6.2％的BPA。总体而言，CDP-TiO ₂微球代表了有望用于光催化水处理的有前途的材料。