摘要：

利用水热法合成CoFe₂O₄/MoS₂复合材料催化剂。采用SEM、XRD、XPS、FTIR等手段对该材料的结构和形貌进行表征，并将其用于活化过一硫酸盐（PMS）降解四环素（TC）。进一步探讨了CoFe₂O₄/MoS₂投加量、PMS投加量、pH、TC初始质量浓度、共存阴离子等因素对TC降解效果的影响。实验结果表明：当TC初始质量浓度为20 mg/L，CoFe₂O₄/MoS₂投加量为0.5 g/L，PMS投加量为0.4 g/L，pH=3时，60 min内TC降解率可达到92.23%，反应速率常数为0.009 5 L/（mg·min）。在含有无机阴离子的反应体系中，HCO₃ ^-和CO₃ ^2-对CoFe₂O₄/MoS₂活化PMS去除TC有明显抑制作用，SO₄ ^2-、H₂PO₄ ^-、Cl^-抑制作用较弱。自由基猝灭实验证实，CoFe₂O₄/MoS₂活化PMS可以产生活性氧物种SO₄ ^·-、·OH、O₂ ^·-、¹O₂，其均参与了降解TC的反应，其中SO₄ ^·-起主导作用。

关键词: CoFe₂O₄/MoS₂, 四环素, 过一硫酸盐, 降解

Abstract:

The CoFe₂O₄/MoS₂ composite catalyst was synthesized using hydrothermal method. The structure and morphology of the material were characterized by SEM, XRD, XPS, FTIR and other methods.The composite catalyst was used to activate persulfate(PMS) to degrade tetracycline(TC). The effects of CoFe₂O₄/MoS₂ dosages, PMS dosages,pH, initial mass concentration of TC, coexisting anions, and other factors on the degradation efficiency of TC were conducted. The experimental results showed that under the conditions of the initial TC mass concentration of 20 mg/L, the CoFe₂O₄/MoS₂ dosage of 0.5 g/L, the PMS dosage of 0.4 g/L, and the pH of 3, the degradation rate of TC could reach 92.23% within 60 minutes, and the reaction rate constant was 0.009 5 L/(mg·min). In the reaction system containing inorganic anions, HCO₃ ^- and CO₃ ^2- had significant inhibitory effects on the removal of TC by CoFe₂O₄/MoS₂ activated PMS, while SO₄ ^2-, H₂PO₄ ^-, and Cl^- had weaker inhibitory effects. The free radical quenching experiment confirmed that CoFe₂O₄/MoS₂ activated PMS could produce reactive oxygen species including SO₄ ^·-, ·OH, O₂ ^·- and ¹O₂, all of which participated in the degradation of TC, with SO₄ ^·- playing a dominant role.

Key words: CoFe₂O₄/MoS₂, tetracycline, peroxymonosulfate, degradation

中图分类号: 

• X703

• TU992