磁性活性炭催化臭氧氧化降解水中甲基橙

通过浸渍法制备了钕铁硼磁性活性炭(Nd Fe B/AC),采用SEM和VSM技术对其进行了表征,并将其作为非均相催化剂用于臭氧氧化降解水中甲基橙(MO)。表征结果显示:Nd Fe B/AC具有硬磁特性;当m(Nd Fe B)∶m(AC)=1∶2时,其比饱和磁化强度和比剩余磁化强度分别为15.9 A·m2/kg和6.0 A·m2/kg,矫顽力可达104.5k A/m。实验结果表明:在Nd Fe B/AC投加量为3.0 g/L、初始溶液p H为5.0、初始MO质量浓度为20 mg/L、臭氧质量浓度为15.0 mg/L、室温的条件下反应40 min,MO降解率达93.9%,显著优于投加AC的64.4%;AC和Nd Fe B/AC催化臭氧氧化降解MO的反应过程均遵循一级动力学规律,且Nd Fe B/AC的反应速率常数为AC的近3倍。

Degradation of Methyl Orange in Water by Catalytic Ozone Oxidation with Magnetic Activated Carbon

The neodymium-iron-boron-based magnetic activated carbon （NdFeB/AC） was prepared by dipping method and characterized by SEM and VSM technology. And it was used as a heterogeneous catalyst for ozone oxidation of methyl orange （MO） in water. The characterization results indicate that：NdFeB/AC is hard magnetic;When m（NdFeB）∶m（AC）=1∶2,its specific saturation magnetization,specific remanent magnetization and coercive force are 15.9 A·m²/kg,6.0 A·m²/kg and 104.5 kA/m respectively. The experimental results show that：Under the conditions of NdFeB/AC dosage 3.0 g/L,initial solution pH 5.0,initial MO mass concentration 20 mg/L,ozone mass concentration 15.0 mg/L,room temperature and reaction time 40 min,the MO degradation rate can reach 93.9%,which is significantly better than 64.4% of that with AC as catalyst;The degradation process of catalytic ozone oxidation with AC and NdFeB/AC both follows the first order dynamic law,and the reaction rate constant with NdFeB/AC is nearly 3 times as much as that with AC.