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Photocatalysts of Cr Doped TiO2 Film Prepared by Micro Arc Oxidation
Li Wan a,Jian-feng Li a,Jia-you Feng a*,Wei Sun b,Zong-qiang Mao b
Author NameAffiliationE-mail
Li Wan a Department of Material Science and Engineering, Key Laboratory for Advanced Materials of Ministry of Education, Tsinghua University, Beijing 100084, China  
Jian-feng Li a Department of Material Science and Engineering, Key Laboratory for Advanced Materials of Ministry of Education, Tsinghua University, Beijing 100084, China  
Jia-you Feng a* Department of Material Science and Engineering, Key Laboratory for Advanced Materials of Ministry of Education, Tsinghua University, Beijing 100084, China ml02@mails.thu.edu.cn 
Wei Sun b Department of Material Science and Engineering, Key Laboratory for Advanced Materials of Ministry of Education, Tsinghua University, Beijing 100084, China  
Zong-qiang Mao b Department of Material Science and Engineering, Key Laboratory for Advanced Materials of Ministry of Education, Tsinghua University, Beijing 100084, China  
Abstract:
A series of Cr doped TiO2 films were prepared by micro arc oxidation (MAO) using an electrolyte of Na3PO4+K2Cr2O7. X-ray diffraction and scanning electron microscopy revealed that the films mainly consisted of anatase phase with a porous surface morphology. The films have an excellent photocatalytic effect for degradation of methylene blue and decomposition of water under visible light illumination. This arises from the formation of Cr3+/Cr4+ and oxygen vacancy energy levels owing to Cr doping. The former reduces the electron-hole recombination chance, while the latter generates a new gap between the conduction band (CB) and valence band (VB) of TiO2, which lowers the photo energy of the excited electron in the VB to the oxygen vacancy states. The mechanisms for film synthesis during the MAO process are also presented.
Key words:  TiO2, Cr doping, Photocatalysis, Micro arc oxidation
FundProject:
Photocatalysts of Cr Doped TiO2 Film Prepared by Micro Arc Oxidation
万李 a,李剑锋 a,冯嘉猷 a*,孙巍 b,毛宗强 b
摘要:
通过微弧氧化法在Na3PO4+K2Cr2O7电解液中制备了系列铬掺杂二氧化钛薄膜. X射线和扫描电镜显示薄膜的主要晶相为锐钛矿型二氧化钛,且表面为多孔结构. 在可见光照射下,薄膜对降解亚甲基蓝和分解水有着较好的光催化性能,这主要是由铬的掺杂引起的.由于铬的掺杂,一方面在二氧化钛中形成了Cr3+/Cr4+离子对,另一方面在带隙中形成了氧的空位能级. 前者降低了电子-空穴的复合几率,而后者在二氧化钛的禁带中形成了新的能级. 新能级的形成使得由二氧化钛价带跃迁至氧空位能级所需的光子能量减少. 另外探讨了微弧氧化形成掺杂二氧化钛薄膜的机制.
关键词:  二氧化钛,铬掺杂,光催化,微弧氧化
DOI:10.1088/1674-0068/21/05/487-492
分类号: