磁性Fen+@GO非均相Fenton催化氧化亚甲基蓝

采用化学共沉淀法制备了磁性Feⁿ⁺@GO（MFGO）纳米复合材料，并将其用于非均相Fenton催化氧化亚甲基蓝（MB）.扫描电镜、透射电镜和光电子能谱分析表明，催化活性粒子（Feⁿ⁺/铁氧化物）成功负载在GO表面.实验研究了pH值、H₂O₂初始浓度、催化剂投加量等因素对MB降解效果的影响.结果表明，H₂O₂、MFGO和H₂O₂+MFGO体系在反应120min后，MB降解率分别达到7.83%、25.58%和99.19%；在优化条件为H₂O₂浓度0.79mol/L、MFGO用量0.75g/L、pH值8时，MB降解率可达99.90%；在pH值为3~11范围内，MB降解率均在99%以上；MFGO经过6次重复使用后对MB的降解率仍可达到95.08%，是一种pH值响应宽、可磁分离回收的新型非均相催化剂.

Heterogeneous Fenton catalyzed oxidation of methylene blue by magnetic Fen+@GO

Magnetic Feⁿ⁺@GO (MFGO) nanocomposite was prepared by coprecipitation and applied as a heterogeneous Fenton catalyst for catalytic oxidation of methyl blue (MB). The scanning electron microscopy (SEM), High-Resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) indicated that the GO nanosheets were successfully loaded by catalytically active particles (i.e., Feⁿ⁺, iron oxide). The effects of pH value, initial H₂O₂ concentration and catalyst dosage on the degradation efficiency were investigated. The degradation efficiencies for the system of H₂O₂, MFGO and H₂O₂ with MFGO after 120min reached 7.83%, 25.58% and 99.19%, respectively. The degradation efficiency of MB was 99.90% at the optimal operating conditions of 0.79mol/L H₂O₂ and 0.75g/L MFGO, pH=8. With the pH ranging from 3to 11, the degradation efficiency of MB was still higher than 99%. Even MFGO was reused for six consecutive runs, the degradation efficiency of MB still reached 95.08%. Furthermore, the novel catalyst was preferable to be utilized in wide pH value and took the advantages in magnetic separation and reuse.