Effective utilization of visible-light by a photocatalyst is of great significance in photocatalytic processes. Herein, magnetite structure was modified by co-incorporation of Ce⁴⁺ and Cr³⁺ cations, and deposition on reduced graphene oxide sheets. The as-prepared Fe_2.8Cr_0.2O₄#rGO and Fe_2.5Cr_0.2Ce_0.3O₄#rGO nanocomposites were characterized by XRD, SEM, X-ray Dot mapping, EDX, BET, DRS, XPS, FT-IR and VSM techniques and assessed for their photocatalytic performance under visible light irradiation for treatment of methylene blue. The results confirmed the central role of the incorporated Cr and Ce in improving the photocatalytic performance of magnetite through enhanced light harvesting, and the role of Ce³⁺/Ce⁴⁺ redox pair, and rGO sheets in extending the life span of photo-induced e⁻/h⁺. Moreover, the influence of enhancers and scavengers were evaluated and oxidation path and generated byproducts were estimated. The results established the Fe_2.5Cr_0.2Ce_0.3O₄#rGO nanocomposite as a visible-light-driven photocatalyst for effective degradation of recalcitrant compounds.

光催化剂有效利用可见光在光催化过程中具有重要意义。在此，通过共掺入Ce ⁴⁺和Cr ³⁺阳离子并沉积在还原的氧化石墨烯片^上来修饰磁铁矿结构。制备的Fe _2.8 Cr _0.2 O ₄ #rGO和Fe _2.5 Cr _0.2 Ce _0.3 O ₄通过XRD，SEM，X射线点图，EDX，BET，DRS，XPS，FT-IR和VSM技术对#rGO纳米复合材料进行了表征，并评估了它们在可见光照射下对亚甲基蓝的光催化性能。结果证实了掺入的Cr和Ce在通过增强光收集来改善磁铁矿的光催化性能方面的中心作用，以及Ce ³⁺ / Ce ⁴⁺氧化还原对和rGO薄板在延长光致寿命方面的作用。 ë ^- / H ⁺。此外，评估了增强剂和清除剂的影响，并评估了氧化途径和产生的副产物。结果确定了Fe _2.5 Cr _0.2 Ce _0.3O ₄ #rGO纳米复合材料，作为可见光驱动的光催化剂，可有效降解顽固性化合物。