Hierarchical Gd-La codoped TiO₂ microspheres as robust photocatalysts

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• 作者：Lin Lin^a ; Yuchao Chai^b ; Yingchao Yang^c ; Xin Wang^d ; Dannong He^a ; ^b ; ^{hdnbill@sh163.net} ; Qunwei Tang^d ; ^{tangqunwei@hotmail.com} ; ^{tangqunwei@ouc.edu.cn} ; Soumitra Ghoshroy^c
• 关键词：Photocatalysts ; Microspheres ; Semiconductors ; TiO2 ; Photodegradation
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：27 February, 2013
• 年：2013
• 卷：38
• 期：6
• 页码：2634-2640
• 全文大小：1060 K

文摘

Robust Gd-La codoped TiO₂ microspheres with diameter of 2¡«3?¦Ìm were successfully synthesized via a hydrothermal method using poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) as a template. The photocatalytic activity of the Gd-La codoped TiO₂ microspheres evaluated by photodegrading methyl orange (MO) has been significantly enhanced compared to that of undoped TiO₂ microspheres. Ti⁴⁺ may substitute for La³⁺ and Gd³⁺ in the lattices of rare earth oxides to create abundant oxygen vacancies and surface defects for electron trapping and dye adsorption, accelerating the separation of photogenerated electron-hole pairs and MO photodegradation. The formation of an exciton energy level below the conduction band of TiO₂ from the binding of electrons and oxygen vacancies decreases the excitation energy of Gd-La codoped TiO₂ microspheres, resulting in robust photocatalysts. The results suggest that Gd-La codoped TiO₂ microspheres calcined at 350?¡ãC are very promising for enhancing the photocatalytic activity of photocatalysts.