Abstract Sustainable and effective formaldehyde (HCHO) remediation at room temperature has significant potential in next-generation indoor environment purification technology. Herein, defective anatase TiO2 was synthesized using chemical vapor condensation (CVC) and was subsequently impregnated with 0.08 wt% Pt. The resulting Pt/CVC-TiO2 catalyst was used for the room-temperature conversion of HCHO and exhibited a HCHO removal efficiency of 80% under continuous flow conditions (GHSV 100,000 cm3 h−1 gcat−1) with an initial concentration of 10 ppm with good stability over 600 min. The characterization results confirmed the metallic oxidation state (Pt0), oxygen vacancies (mainly F centers), disordered domains, and strong interaction between Pt and defective TiO2 were essential for high activity. Moreover, electron paramagnetic resonance (EPR) analysis showed the consistent stability of the defective domains of CVC-TiO2, imparting catalytic stability over multiple cycles. This study highlights the synergistic relationship between oxygen vacancies in the TiO2 support and the resulting HCHO oxidation functionality.

中文翻译：

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用于室温甲醛 (HCHO) 修复的 Pt/TiO2 中 TiO2 载体的缺陷域控制

摘要 室温下可持续有效的甲醛（HCHO）修复在下一代室内环境净化技术中具有巨大潜力。在此，有缺陷的锐钛矿 TiO2 是使用化学气相冷凝 (CVC) 合成的，随后用 0.08 wt% 的 Pt 浸渍。所得 Pt/CVC-TiO2 催化剂用于 HCHO 的室温转化，在初始浓度为 10 ppm 的连续流动条件（GHSV 100,000 cm3 h-1 gcat-1）下，HCHO 去除效率为 80%。 600 分钟以上稳定性良好。表征结果证实金属氧化态（Pt0）、氧空位（主要是 F 中心）、无序域以及 Pt 和缺陷 TiO2 之间的强相互作用对于高活性至关重要。而且，电子顺磁共振 (EPR) 分析显示 CVC-TiO2 缺陷域的稳定性一致，在多个循环中赋予催化稳定性。该研究强调了 TiO2 载体中的氧空位与由此产生的 HCHO 氧化功能之间的协同关系。