Preparation and Photocatalysis Activity of Eu2+/Gd3+ codoped Nano-TiO2 Multiplex Photocatalyst from Sol-Gel Process Catalyzed with Acid

doi:10.3724/SP.J.1077.2008.01085

Abstract

Abstract: A new nano-TiO₂ multiplex photocatalyst codoped with Eu²⁺ and Gd³⁺ was prepared by a modified acidic sol-gel process. TEM and XRD results demonstrate that as-produced samples are anatase structure, and the crystallite size has relationship
only with total doped Eu^2+/Gd³⁺ content and the minimum size appeares at 1% doped content. UV-Vis absorption spectra show
that Eu^3+/Gd³⁺ codoping can enhance the visible light response of the TiO₂. The photocatalyst activity of Eu^2+/Gd³⁺ codoped TiO₂ is evaluated by photodegradation of methyl orange in an aqueous solution under natural light irradiation, A synergetic effect is observed due to Eu^2+/Gd³⁺ codoping, and the optimal doping concentration for Gd³⁺ and Eu²⁺ are in the range from 0.1% to 1.0% and 0.5% to 1.5% respectively. The relationship and function between Eu²⁺, Gd³⁺ and TiO₂ are also discussed.

Key words: rare earth, codoping, synergetic effect, photocatalysis

CLC Number:

O634

ZHOU Yi,HUANG Ke-Long,ZHU Zhi-Ping,YANG Bo,XIA Chang-Bin,XIAO Han-Ning. Preparation and Photocatalysis Activity of Eu^2+/Gd³⁺ codoped Nano-TiO₂ Multiplex Photocatalyst from Sol-Gel Process Catalyzed with Acid[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.01085.

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Preparation and Photocatalysis Activity of Eu^2+/Gd³⁺ codoped Nano-TiO₂ Multiplex Photocatalyst from Sol-Gel Process Catalyzed with Acid

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