针对非均相光芬顿中两相传质阻力导致催化性能较低的缺陷，采用水热法制备了α-Fe₂O₃{110}/{113}晶面不同暴露比例的催化剂。采用X射线衍射分析（XRD）、透射电子显微镜（TEM/HRTEM）、傅里叶变换红外光谱（FTIR）以及紫外可见固体漫反射（UV-vis DRS）对催化剂进行表征分析，分别考察了H₂O₂浓度、催化剂投加量、甲基橙初始质量浓度以及初始pH对其催化降解甲基橙的影响，结果表明：FeCl₃·6H₂O浓度为33 mmol/L，摩尔比FeCl₃·6H₂O∶NaH₂PO₄∶NaF为1∶1∶15，180℃反应24 h所得α-Fe₂O₃催化性能最佳，在H₂O₂浓度为20 mmol/L，催化剂投加量为200 mg/L，甲基橙初始质量浓度为40 mg/L以及初始pH=5的条件下，对甲基橙的催化降解效果最佳，反应60 min去除率达97.83%；重复试验表明催化剂稳定性较好；H₂O₂消耗分析及自由基捕获实验结果表明，羟基自由基和光生空穴发挥关键催化降解作用，超氧自由基作用较小。

To address the defect of low catalytic performance due to the two-phase mass transfer resistance in heterogeneous photo-Fenton, a hydrothermal method was used to prepare catalysts α-Fe₂O₃ that exposed different ratios of crystal plane {110}/{113}. α-Fe₂O₃ was characterized by XRD, TEM/HRTEM, FTIR and UV-vis DRS. The effects of H₂O₂ concentration, catalyst dosage, initial concentration of methyl orange and initial pH on α-Fe₂O₃ on methyl orange catalytic degradation were investigated. The results showed that the α-Fe₂O₃ achieved the best catalytic performance when the concentration of precursor FeCl₃·6H₂O was 33 mmol/L, the dosage ratio of FeCl₃:6H₂O:NaH₂PO₄:NaF was 1:1:15, and the reaction temperature was 180℃. Moreover, at the H₂O₂ dosage of 20 mmol/L, catalyst dosage of 200 mg/L, initial methyl orange concentration of 40 mg/L and initial pH of 5, the removal of methyl orange was the best, reaching 97.83% in 60 min. The catalyst exhibited good stability after consecutive degradation cycles. The H₂O₂ consumption analysis and free radical trapping experiment results showed that hydroxyl radicals and photo-generated holes played a key role in the catalytic degradation process, while superoxide radicals had less effect.

国家重点研发计划资助项目（2019YFD1100101-06）。