Abstract:

Magnetic manganese ferrite (MnFe₂O₄) prepared by the salt-assisted solution combustion synthesis was used to activate peroxymonosulfate(PMS) to oxidize bisphenol A in aqueous solution. The prepared MnFe₂O₄ catalyst was characterized by XRD and BET. The effects of MnFe₂O₄ dosage, PMS dosage, initial pH of the solution, quencher, and co-existing ions on the degradation of bisphenol A were investigated. The reusability of the MnFe₂O₄ catalyst was evaluated through cycling experiments. The results showed that the best dosages of MnFe₂O₄ and PMS were 0.3 g/L and 0.3 mmol/L, respectively. When the initial pH was 11.0, the degradation rate of bisphenol A was 99.3% in 60 min. When putting some quenchers into the MnFe₂O₄/PMS catalytic system, all of them showed depression effects on degradation of bisphenol A, and the ¹O₂ was the main active species. The co-existing ions such as Cl^-, HCO₃^-, and HPO₄^2- in solution affected the degradation of bisphenol A. The TOC removal rate of bisphenol A within 60 min was 34.9%, the rupture and opening of benzene ring are the main reaction pathways. After the MnFe₂O₄ catalyst was recycled three times, the degradation rate of bisphenol A remained at about 90.0%.

Key words: bisphenol A, MnFe₂O₄, salt-assisted solution combustion synthesis, sulfate radical, catalysis, degradation, preparation

摘要：

采用盐助溶液燃烧法制备磁性铁酸锰（MnFe₂O₄），催化过一硫酸氢盐（PMS）氧化降解水溶液中的双酚A。通过XRD、BET等手段对制备的铁酸锰催化剂进行了表征。探究了MnFe₂O₄投加量、PMS投加量、溶液初始pH、淬灭剂、共存离子等因素对双酚A降解效果的影响，评估了MnFe₂O₄催化剂的循环利用性能。结果表明，MnFe₂O₄和PMS的最合理投加量分别为 0.3 g/L、0.3 mmol/L，初始pH为11.0时双酚A降解效果最好，60 min内的降解率可达99.3%。淬灭实验表明，催化体系中同时存在多种活性物质，¹O₂是主要活性物种。溶液中Cl^-、HCO₃^-和HPO₄^2-等共存离子的存在影响双酚A的降解。双酚A在60 min内的TOC去除率为34.9%，苯环断裂和开环反应是其主要降解路径。MnFe₂O₄催化剂循环使用三次后，双酚A的降解率仍保持在90.0%左右。

关键词: 双酚A, MnFe₂O₄, 盐助溶液燃烧法, 硫酸根自由基, 催化, 降解, 制备