Citation: HUANG Xin-Song, LI Li-Ping, LI Guang-She. Internalization of Foreign Ions into Meta-stable Lattices: a Case Study of Transition-metal-doped Brookite[J]. Chinese Journal of Structural Chemistry, ;2016, 35(8): 1157-1166. doi: 10.14102/j.cnki.0254-5861.2011-1340 shu

Internalization of Foreign Ions into Meta-stable Lattices: a Case Study of Transition-metal-doped Brookite

1.
a Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;
2.
b State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China

Corresponding author: LI Guang-She,
Received Date: 23 February 2016
Available Online: 7 July 2016
Fund Project:

The connections between the building units of meta-stable lattice were generally considered to be easily disturbed during the doping process, causing serious hindrances blocking the development of functional doped materials. In this work, the synthesis of doped brookite, a typical meta-stable phase of TiO₂, has been explored novelly by in-situ adding of cations of VIIIB and IB, IIB elements in the 3^rd period (Fe, Co, Ni, Cu, Zn) during the urea-lactate aided low-basicity hydrothermal process. The results showed that only Cu-doped brookite could be successfully synthesized with trace amount of copper intensively internalized into the brookite lattice, while the other dopants lead to the formation of anatase TiO₂. Extensive characterizations indicated a two-step doping process, where copper ions were firstly dispersed in an amorphous layer on the lattice surface and then they were internalized into brookite lattice. Cu-doped brookite exhibited significantly enhanced photocatalytic activity in the phenol degradation under visible light compared to bare brookite. The enhancement of catalytic performance was assigned to the impurity band gap and the reduction of charge carriers' recombination introduced by the internalization of Cu ions. The investigation reported herein contributes to the understanding of complex ion-doping effects on the structures of meta-stable materials, and provides hints for obtaining other functional doped materials.
- meta-stable lattice,
- doped materials,
- brookite,
- photocatalyst,
- phenol degradation
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