CAJ | 학술논문

通过TG、物相分析、XPS、XRD、SEM-EDS等手段研究铁酸锌选择性还原反应机理，考察铁酸锌质量损失和分解特征、物相转变过程和产物层形貌变化以及Zn 2+与Fe2+的离子迁移行为。结果表明：反应表现为失氧过程，还原产生的Fe2+使铁酸锌分解产生ZnO，ZnO含量与Fe2+含量线性相关。Fe2+向铁酸锌内部迁移替代Zn2+， Zn2+则向外部迁移并富集于表面，促使ZnO在表面形成。铁酸锌逐步向磁铁矿转变，Fe2+的嵌入和锌的迁出使铁酸锌晶胞参数先增大后减小，还原产物为ZnO和含锌的磁铁矿。颗粒产物层中的还原产物相互夹杂，并包裹着未反应的铁酸锌。
통과TG、물상분석、XPS、XRD、SEM-EDS등수단연구철산자선택성환원반응궤리，고찰철산자질량손실화분해특정、물상전변과정화산물층형모변화이급Zn 2+여Fe2+적리자천이행위。결과표명：반응표현위실양과정，환원산생적Fe2+사철산자분해산생ZnO，ZnO함량여Fe2+함량선성상관。Fe2+향철산자내부천이체대Zn2+， Zn2+칙향외부천이병부집우표면，촉사ZnO재표면형성。철산자축보향자철광전변，Fe2+적감입화자적천출사철산자정포삼수선증대후감소，환원산물위ZnO화함자적자철광。과립산물층중적환원산물상호협잡，병포과착미반응적철산자。
The selective reduction mechanism of zinc ferrite was studied by TG, phase analysis, XPS, XRD and SEM-EDS. The mass loss, decomposition features of zinc ferrite, ionic migration behavior of Zn 2+ and Fe2+ ions, phase transformation process and morphological change of product layer were investigated. The results show that reaction is oxygen loss process. The reduced Fe2+ made ZnO separated from zinc ferrite, the content of ZnO has a significant linear correlation with the content of Fe2+. Fe2+ migrates into the inner zinc ferrite to substitute Zn2+, while Zn2+ moves out and enriches on the surface, promoting the formation of ZnO. Zinc ferrite transforms to magnetite, the lattice parameter of zinc ferrite increases and then decreases due to the intercalation of Fe2+ and the emigration of Zn2+. The reduction products are zinc oxide and zinc-containing magnetite. The reduction products coexist with each other in the product layer and unreacted zinc ferrite is covered with the product layer.