With the development of society, water pollution is becoming more and more serious, especially dyeing wastewater. Fe-doped TiO₂ nano-photocatalyst was prepared by hydrothermal method. The crystal structure, morphology, optical properties, band gap width (Eg) and photocatalytic properties of the synthesized nanoparticles were characterized by XRD, SEM, TEM, EDS, XPS, FT-IR and UV–vis. The results show that Fe-TiO₂ is a mixed crystal form of rutile type and anatase type, the average crystal diameter of anatase type is 11 nm, and the diameter of rutile type is 10–50 nm. The addition of Fe can effectively reduce the band gap width of TiO₂ from 3.22 eV to 2.33 eV, so as to expand the visible light absorption range. Under 350 W xenon lamp irradiation, the degradation rate of Rhodamine B (RhB) reached 95.3% with 2% Fe-TiO₂ nanoparticles in the synergistic effect of sodium persulfate (PS) for 40 min, and the nanoparticles had good reusability. Free radical quenching experiments showed that·OH, SO₄^-·, e^-, and h⁺ pairs favored RhB degradation. The addition of Fe can form additional energy levels in TiO₂, so that the smaller energy photons can excite the electrons and holes trapped in the additional energy levels, so that the absorption of TiO₂ is redshifted and the visible light absorption range is extended. Meanwhile, PS accelerates the transformation between Fe(Ⅲ) and Fe(Ⅱ), thereby effectively improving the photocatalytic efficiency.

随着社会的发展，水污染越来越严重，尤其是印染废水。采用水热法制备了Fe掺杂TiO ₂纳米光催化剂。通过 XRD、SEM、TEM、EDS、XPS、FT-IR 和 UV-vis 对合成纳米颗粒的晶体结构、形貌、光学性能、带隙宽度 (Eg) 和光催化性能进行了表征。结果表明，Fe-TiO ₂为金红石型和锐钛矿型混合晶型，锐钛矿型平均晶粒直径为11 nm，金红石型晶粒直径为10~50 nm。Fe的添加可以有效减小TiO _{2的带隙宽度}从3.22 eV到2.33 eV，从而扩大可见光吸收范围。350 W氙灯照射下_{,2% Fe-TiO 2}纳米粒子在过硫酸钠(PS)的协同作用下40 min,罗丹明B(RhB)的降解率达到95.3%自由基猝灭实验表明·OH、SO₄^-·、e^-和h⁺对有利于RhB 的降解。_{Fe的添加可以在TiO 2}中形成附加能级，使得能量较小的光子可以激发附加能级中捕获的电子和空穴，从而使TiO₂红移，可见光吸收范围扩大。同时，PS加速了Fe(Ⅲ)和Fe(Ⅱ)之间的转化，从而有效提高光催化效率。