通过微乳液法制备了Fe掺杂钙钛矿型KMgF3光催化剂,运用扫描电子显微观察(SEM)、X射线衍射光谱(XRD)、紫外可见漫反射光谱(UV-Vis DRS)、光致发光光谱(PL spectra)、X射线光电子能谱(XPS)等对催化剂形貌、结构及理化特性等进行表征.考察了制备材料对水体中罗丹明B和甲基橙的光降解性能和其稳定性.结果表明,Fe3+通过取代Mg2+掺杂进入KMgF3晶格形成均质固溶体,抑制晶粒长大和团聚的同时形成新的掺杂能级和浅电子陷阱,显著改善催化剂的光谱响应和抑制催化剂表面光生电子和空穴的复合.最适Fe3+掺杂量为Mg2+的1/4(摩尔分数),掺杂催化剂对水体罗丹明B、甲基橙的降解率30 min内分别可达92％、91％,相比未掺杂的催化剂,降解率分别显著提升了约63％、68％.经5次光降解实验循环后,掺杂催化剂活性仍可保持新鲜催化剂的90％以上.
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