Herein, a 3D sponge-like polypyrrole/TiO₂ (Ppy-TiO₂) composite aerogel was developed for the first time to remove hydroxybenzotriazole (HOBt) from water. Mesoporous TiO₂ was prepared via a sol–gel method, and then the Ppy-TiO₂ composite hydrogel was prepared by oxidative polymerization and converted to aerogel by freeze-drying. The morphological, compositional, and surface characteristics of the prepared materials were detailly characterized. The characterization studies revealed that pure anatase mesoporous TiO₂ nanoparticles were successfully prepared and incorporated into amorphous 3D Ppy with a porous chain-like network structure. Coupling Ppy and TiO₂ extended the light absorption to the visible region and decreased the electron/hole recombination rate. The performance studies revealed that the Ppy-TiO₂ composite has higher adsorption and photocatalytic activities than the sum of the individual components. Optimum performance was obtained at pH 5.3 using 0.25 g/L of the Ppy-TiO₂ composite with a Ppy: TiO₂ mass ratio of 1:1. The intermolecular hydrogen bonding was pivotal in the adsorption process which was multilayer. The degradation of HOBt occurs primarily by holes, then superoxide anion radicals. The total organic carbon (TOC) analysis showed a 90% reduction in carbon content after 30 min of treatment. The toxicity study indicated that the photocatalytic process decreased the toxicity of the HOBt solution. The synergism between adsorption and photocatalysis, easy separation, and reusability promote the application of Ppy-TiO₂ composite aerogel for water treatment.

在此，首次开发了一种 3D 海绵状聚吡咯/TiO₂ （Ppy-TiO₂） 复合气凝胶，用于去除水中的羟基苯并三唑 （HOBt）。通过溶胶-凝胶法制备介孔 TiO₂，然后通过氧化聚合制备 Ppy-TiO₂ 复合水凝胶，并通过冷冻干燥转化为气凝胶。详细表征了所制备材料的形态、成分和表面特性。表征研究表明，成功制备了纯锐钛矿介孔 TiO₂ 纳米颗粒，并将其掺入具有多孔链状网络结构的无定形 3D Ppy。耦合 Ppy 和 TiO₂ 将光吸收扩展到可见区域，并降低了电子/空穴复合速率。性能研究表明，Ppy-TiO₂ 复合材料具有比单个组分之和更高的吸附和光催化活性。在 pH 值为 5.3 时，使用 0.25 g/L 的 Ppy-TiO₂ 复合材料，Ppy：TiO₂ 质量比为 1：1，可获得最佳性能。分子间氢键在多层吸附过程中起着关键作用。HOBt 的降解主要通过空穴发生，然后是超氧阴离子自由基。总有机碳 （TOC） 分析显示处理 30 分钟后碳含量降低 90%。毒性研究表明，光催化过程降低了 HOBt 溶液的毒性。吸附与光催化的协同作用、易分离性和可再利用性促进了 Ppy-TiO₂ 复合气凝胶在水处理中的应用。