Enhanced photocatalytic properties of N–P co-doped TiO₂ nanosheets with {001} facets

Fang Wang¹，Pei-Pei Ban¹，James P.Parry²，Xiao-Hong Xu¹，Hao Zeng²

1. Key Laboratory of Magnetic Molecules and Magnetic Information Material of Ministry of Education,School of Chemistry and Materials Science,Shanxi Normal University2. Department of Physics,University at Buffalo,State University of New York

摘 要：Nitrogen（N） and phosphorus（P） co-doped anatase TiO₂ nanosheets were realized by low-temperature self-doping N–TiO₂ followed by high-temperature P doping with foreign precursor. It is found that P doping process can maintain good TiO₂ nanosheets morphology with exposed {001} facets. Chemical state of dopants indicates that N and P atoms replace O on O sites in TiO₂ lattice.Compared with pure TiO₂and N-doped TiO₂, N–P codoped TiO₂ nanosheets exhibits stronger optical absorption and higher degradation rate of dye molecules in visible light regime. The enhanced photocatalytic properties are attributed to two factors. On one hand, N–P co-doping can effectively reduce band gap of TiO₂from 3.20 to 2.48 e V,leading to an enhancement of the absorption in visible light regime. On the other hand, the presence of exposed {001}facets of TiO₂ nanosheets can induce the effective separation of photogenerated electrons and holes in reaction.

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