摘要：

以钛酸丁酯、氢氟酸为主要原料，通过水热法制备了纳米TiOF₂臭氧氧化催化剂。利用XRD、FT-IR、SEM、XPS对合成的样品进行表征，苯胺作为目标污染物进行催化性能测试。成功制备了球花状TiOF₂纳米催化剂，其粒径为180~200 nm，比表面积为105.38 m²/g。碱性环境可以促进反应进行，OH^-可以使反应正向进行促进污染物降解，过量的催化剂不利于反应进行，催化剂投加质量浓度高于0.6 g/L时会因团聚导致降解率下降。在催化剂投加质量浓度为0.6 g/L，初始COD为250 mg/L，臭氧流量为0.1 L/min，pH=10时，反应80 min后，降解率达到了98.83%。球花状TiOF₂由纳米片拼插形成，这种结构为催化剂提供了复杂的表面，使催化剂具有较大的比表面积，暴露更多的活性位点，为反应提供更多的反应场所。F^-使催化剂中生成氧空位和Ti³⁺，更利于吸附H₂O形成表面—OH基团，便于吸附解离水分子从而提供更多的·OH，促进了反应进行，提高了O₃的COD降解能力。

关键词: 水处理, 纳米催化剂, 氧空位, 臭氧催化氧化

Abstract:

Nano TiOF₂ ozone oxidation catalyst was prepared by hydrothermal method with butyl titanate and hydrofluoric acid as main raw materials. The synthesized samples were characterized by XRD，FT-IR，SEM and XPS，and the catalytic performance was tested with aniline using as the target pollutant. The ball-flower TiOF₂ nano-catalyst was successfully prepared，and its particle size was 180-200 nm，and the specific surface area was 105.38 m²/g. The OH^- could make the reaction forward to promote the degradation of pollutants in alkaline environment，excessive catalyst was not conducive to the reaction. The catalyst dosage higher than 0.6 g/L would occur agglomeration phenomenon，resulting in degradation rate. When catalyst dosage was 0.6 g/L，initial COD was 250 mg/L，ozone mass concentration was 0.1 L/min，pH=10，the degradation rate reached 98.83% after reacting for 80 min. The ball flower TiOF₂ was formed by the splice of nanosheets，this structure provided a complex surface for the catalyst and made the catalyst have a larger specific surface area，exposing more active sites and providing more reaction sites for the reaction. F^- could generate oxygen vacancies and Ti³⁺ in the catalyst，which was more conducive to the adsorption of H₂O to form OH groups on the surface and benefit to the adsorption and dissociation of water molecules to provide more ·OH. It promoted the reaction，and improved the COD degradation capacity of O₃.

Key words: water treatment, nano-catalyst, oxygen vacancy, ozone catalytic oxidation

中图分类号: 

• X703