Recently treatment of oxytetracycline hydrochloride (OTC) antibiotic wastewater has attracted more attention. In this work, coral-like HTiOF3 was used as a template to construct -TiO2, TiOF2/HTiOF3, F-H2Ti3O7 small-scale nanomaterials by adjusting different solvothermal methods. The crystal form, structure, morphology, optical properties, and charge separation properties of the obtained materials were thoroughly characterized by several techniques. Among these materials, F-H2Ti3O7 (KOH-HTF) synthesized by alkali thermal synergistic ion exchange method, showed excellent degradation activity to OTC (92%). Three-dimensional (3D) flower-like morphology enhances KOH-HTF's adsorption capacity for OTC. The co-modification of lattice fluorine and surface fluorine introduced in situ during the preparation of KOH-HTF brings a significant surface fluorine effect, which is not only conducive to the generation of Ti3+ and oxygen vacancies (Ov), but also conducive to the activation of OTC molecules and migration of photogenerated electrons and holes. In addition, ·O2- has been proven to be the main active species in the photocatalytic process. It is proposed that the ligand-to-metal charge transfer (LMCT) effect between KOH-HTF and OTC is the key to improving the visible light response and carrier separation, and the possible photocatalytic mechanism is investigated.

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