磁性CoFe_2O_4催化PMS降解水体中磺胺甲基嘧啶的研究

Degradation of sulfamerazine in aqueous solution by magnetic CoFe_2O_4 catalytic PMS technology

针对普通工艺难以降解水中磺胺类抗生素现象,采用CoFe_2O_4/PMS工艺降解水中磺胺甲基嘧啶。磁性纳米铁酸钴(CoFe_2O_4)通过催化分解单过氧硫酸氢钾(PMS)产生具有强氧化性的硫酸自由基(·SO_4^-)降解水中磺胺甲基嘧啶,探讨了溶液中CoFe_2O_4浓度、PMS浓度、温度、反应物初始浓度、pH、无机阴离子和腐植酸浓度等影响因素。结果表明,降解过程符合拟一级动力学模型。一定范围内,CoFe_2O_4、PMS浓度越高,降解速率越快;温度对降解效果影响较大;反应物初始浓度与降解速率呈负相关;pH=9时降解速率最快;一定浓度的HCO_3^-促进磺胺甲基嘧啶的降解,Cl-则抑制其降解;腐植酸浓度越高,降解速率越慢。

As sulfonamide antibiotics in water was hard to be removed by general technologies,CoFe_2O_4/PMS technology was used for sulfamerazine degradation. CoFe_2O_4 catalytic decomposition peroxymonosulfate（ PMS） produce strong oxidizing sulfate anion radical（ ·SO_4^-） to degrade sulfamerazine in aqueous solution. Effects of concentration of CoFe_2O_4 and PMS,temperature,initial concentration of reactant,p H,inorganic anion and humic acid concentrations in aqueous solution was discussed. The results show that the degradation process conformed pseudo-first-order kinetics mode. The degradation rates increased with increasing PMS and CoFe_2O_4 concentration. The degradation rates were affected greatly by temperature,the degradation rate decreasing with initial concentration of reactant increasing. The fastest degradation rate the condition of p H = 9. Approprite concentration HCO_3^- had positive effect for sulfamerazine degradation,while Cl-had negative effect. The degradation rates decreased with increasing humic acids concentration.