以六水合氯化铁和氟化钠为原料、柠檬酸钠为络合剂，采用水热法制备氟掺杂的前驱体，在空气中于650℃热处理得到α-Fe₂O₃。通过XRD、SEM、EDS和FT-IR对样品结构、形貌与组成进行表征，考察其在可见光下对亚甲基蓝（MB）的光催化降解性能。结果表明，氟的掺杂使材料的粒径减小，分散度提高；同时，材料的带隙能缩小，光吸收能力增强。最优样品Fe₂O₃-3对亚甲基蓝的光催化降解率为97.78%，经过4次重复使用后，对亚甲基蓝的降解率为94.58%，仍具有较好的降解性能。

Using ferric chloride hexahydrate and sodium fluoride as raw materials,and sodium citrate as a complexing agent,a fluorine-doped precursor is prepared via the hydrothermal method.F-doped α-Fe₂O₃ can be obtained through the thermal treatment of the precursor in the air at 650℃.Its structure,composition and morphology are characterized by XRD,SEM,EDS and FT-IR,and its photocatalytic degradation performance to methylene blue (MB) under visible light is investigated.It is shown that the doping of fluorine reduces the particle size of the material and increases the degree of dispersion.Meanwhile,the band gap of the material is reduced and the light absorption capacity is enhanced.The photocatalytic degradation rate of the best sample Fe₂O₃-3 to MB is 97.78%.After 4 times of repeated use,the degradation rate of MB by F-doped α-Fe₂O₃ can still reach 94.58%,representing a good degradation performance.

韩晴玉(1994-),女,硕士研究生,研究方向为水环境处理,eveolve@163.com