通过超声的方法将十二烷基硫酸钠(SDS)修饰至Fe₃O₄@MoS₂表面,得到Z型异质结Fe₃O₄@MoS₂@SDS光催化剂,考察了Fe₃O₄@MoS₂@SDS光催化降解四环素(TC)的降解率。结果表明,在光照2 h后,Fe₃O₄@MoS₂@SDS对TC的去除率达到89.7%,远高于Fe₃O₄@MoS₂(57.6%)、MoS₂(43.4%)、Fe₃O₄(26.7%);Fe₃O₄@MoS₂@SDS对TC的光降解过程符合一级动力学。在TC的光降解过程中h⁺、·O₂^-、·OH活性自由基均发挥了作用,且h⁺、·O₂^-在降解TC时起主要作用。Fe₃O₄@MoS₂@SDS属于Z型异质结,该结构有效加速了光生电子和h⁺的转移和分离效率。

The surface of Fe₃O₄@MoS₂ is modified with sodium dodecyl sulfate (SDS) by ultrasonic method to obtain a Z-type heterojunction Fe₃O₄@MoS₂@SDS photocatalyst.The photocatalytic degradation rate of tetracycline by Fe₃O₄@MoS₂@SDS photocatalyst is investigated.Results show that the removal rate of tetracycline by Fe₃O₄@MoS₂@SDS reaches 89.7% after 2 h of illumination,which is much higher than those by Fe₃O₄@MoS₂(57.6%),MoS₂(43.4%) and Fe₃O₄(26.7%).The photocatalytic degradation of tetracycline by Fe₃O₄@MoS₂@SDS accords with the first-order kinetics.In the photocatalytic degradation process of tetracycline,h⁺,·O₂^- and ·OH active radicals all play a role,in which h⁺ and ·O₂^- play a major role.Fe₃O₄@MoS₂@SDS belongs to Z-type heterojunction,which effectively accelerates the transfer and separation efficiency of photogenerated electrons and h⁺.

杨馨(2002-),女,本科生,主要从事环境污染控制研究,187396018@qq.com。