中文摘要：

采用水热法合成磁性Fe3O4纳米微球，将其作为催化剂与H2O2组成非均相Fenton体系降解亚甲基蓝（MB），并对Fe3O4纳米颗粒进行了TEM、XRD表征。对初始pH值、H2O2投加量、Fe3O4投加量等条件进行了试验，考察了催化剂的重复利用性能。结果表明：pH值为3、H2O2浓度为0.4 mL/L、催化剂投加量为1.2 g/L、反应温度T=30 ℃、振荡速度为150 r/min时降解效果最好，反应2 h后MB（150 mg/L）降解率为99.6%，催化剂重复利用3次降解效果仍良好。

英文摘要：

Hydrothermal method is adopted to synthesize the magnetic Fe3〇 4 nanocomposites, which serves as the catalyst to degrade methylene blue （ MB）. Fe3〇 4 nanoparticles are characterized by TEM and XRD. And catalytic capacity of Fe3〇 4 and its reusability are evaluated comprehensively. The suitable experimental parameters, including initial pH value,H2O2 concentration and catalyst loading, are also explored. Results show that the optimal degradation performance is achieved when the reaction conditions are set as follows ： pH value is 3,concentration of H2O2 is 0.4 mL/L,catalyst loading is 1.2 g /L ,reaction temperature is 30 丈, and a rotary shaker is at 100 r/min. When the reaction lasts 2 h, the degradation rate of MB （ 150 mg/L） is 99.6%. In addition, the degradation efficiency of catalyst is still satisfactory after repeating three times.