LaCuO_(3)/3DOMCeO_(2)的制备及其催化性能研究

Preparation of LaCuO_(3)/3DOMCeO_(2)and Its Catalytic Property

制备了钙钛矿型LaCuO_(3)/3DOMCeO_(2)催化剂用于非均相类芬顿反应降解罗丹明B,并通过XRD、SEM和XPS等对该催化剂进行表征。结果表明,LaCuO_(3)/3DOMCeO_(2)呈现三维有序大孔结构。负载3DOMCeO_(2)使LaCuO_(3)的比表面积增大、Cu+含量上升。LaCuO_(3)/3DOMCeO_(2)具有比均相芬顿催化剂更宽的pH适用范围和更高的H2O_(2)利用率。循环使用10次后,LaCuO_(3)/3DOMCeO_(2)仍具有较高的催化活性。LaCuO_(3)/3DOMCeO_(2)表面存在Cu^(2+)■Cu+和Ce^(4+)■Ce^(3+)循环,二者协同引发高效类芬顿反应,产生大量·OH和·HO_(2),实现了对罗丹明B的高效降解。

The perovskite catalyst LaCuO_(3)/3DOMCeO_(2)was prepared for the heterogeneous Fenton‑like degradation of rhodamine B and characterized by techniques such as XRD,SEM and XPS.The prepared LaCuO_(3)/3DOMCeO_(2)exhibited a three‑dimensional ordered macroporous structure.The loading of 3DOMCeO_(2)increased the specific surface area and Cu+content of LaCuO_(3).The prepared LaCuO_(3)/3DOMCeO_(2)had a wider pH adaptation range and a higher H2O_(2)utilization rate than those of homogeneous Fenton catalyst.The prepared LaCuO_(3)/3DOMCeO_(2)still showed high catalytic activity after cyclic use for 10 times.There were Cu^(2+)■Cu+and Ce^(4+)■Ce^(3+)cycles on the surface of LaCuO_(3)/3DOMCeO_(2).The synergistic effect of the two reactions induced a highly efficient Fenton‑like reaction,which produced a large number of·OH and·HO_(2),and realized the efficient degradation of rhodamine B.