ABSTRACT

In this research, theEu/TiO₂composite coatings were formed in Na₂H₂PO₄+ KOH + Eu₂O₃by plasma electrolytic oxidation (PEO) technology with different voltages. The morphology, composition and photocatalytic performance of the coatings were investigated. Surface morphology results showed that the micropores decreased on quantity with the increasing voltage. XRD showed the Eu/TiO₂ coatings are composed of anatase and rutile phase and the anatase content first increased and then decreased with the increasing voltage. XPS indicated that Ti2p spin-orbit components of the Eu/TiO₂ composite coatings are shifted towards higher binding energy, compared with the pure TiO₂ coating, suggesting that some of the Eu³⁺ ions are incorporated into TiO₂ lattice.The photocatalytic experiment results showed that the Eu/TiO₂ composite coatings are of higher photocatalytic activity than that of the pure TiO₂ coatings. Besides, with moderate amountEu³⁺ is of positive effect on increasing the photocatalytic activity of Eu/TiO₂ compositecoatings. 

摘要

本研究采用等离子电解氧化（PEO）技术在不同电压下在Na ₂ H ₂ PO ₄ + KOH + Eu ₂ O ₃中形成Eu/TiO ₂复合涂层。研究了涂层的形貌、组成和光催化性能。表面形貌结果表明，随着电压的增加，微孔数量减少。XRD表明Eu/TiO ₂ 涂层由锐钛矿和金红石相组成，锐钛矿含量随着电压的增加先增加后减少。XPS 表明 Eu/TiO _{2 的}Ti2p 自旋轨道组分 与纯TiO ₂ 涂层相比，复合涂层向更高的结合能方向移动，表明部分Eu ³⁺ 离子掺入到TiO ₂ 晶格中。光催化实验结果表明，Eu/TiO ₂ 复合涂层具有更高的光催化性能。活性高于纯 TiO ₂ 涂层。此外，适量的Eu ³⁺ 对提高Eu/TiO ₂ 复合涂层的光催化活性有积极作用。