Titanium dioxide (TiO2) has been known as one of the most promising photocatalytic materials and attracted much attentiondue to its good stability, nontoxicity, high efficiency and low cost[1-3]. However, TiO2 with the wide band gap (Eg= 3.2 eV) can only absorb the near-UV light ( < 380 nm)[4], which greatly limits itspractical applications. In order to overcome this shortcoming, theappropriate modifications such as non-metal doping and metal doping are essential for TiO2 to make maximum use of the visible-light region of sun. In the past few years, plenty of researches havebeen reported that doping TiO2with non-metal elements, suchas carbon, boron, fluorine and nitrogen demonstrated enhancedvisible light photocatalytic activities [5-8]. Among them, nitrogendoping has been proved to be a simple and effective method toattain visible-light photocatalysis [9]. However, most of studies onnitrogen doped TiO2considered that the nitrogen doping is onlya surface or sub-surface modification and difficult to narrow the.band gap in the bulk of TiO2, thus, it could only improve the visiblelight absorption in the range of 400-600 nm. It is really difficult toachieve the absorption in the wider region of 400-800 nm only bythe heterogeneous nitrogen doping
Titanium dioxide (TiO2) has been known as one of the most promising photocatalytic materials and attracted much attentiondue to its good stability, nontoxicity, high efficiency and low cost[1-3]. However, TiO2 with the wide band gap (Eg= 3.2 eV) can only absorb the near-UV light ( < 380 nm)[4], which greatly limits itspractical applications. In order to overcome this shortcoming, theappropriate modifications such as non-metal doping and metal doping are essential for TiO2 to make maximum use of the visible-light region of sun. In the past few years, plenty of researches havebeen reported that doping TiO2with non-metal elements, suchas carbon, boron, fluorine and nitrogen demonstrated enhancedvisible light photocatalytic activities [5-8]. Among them, nitrogendoping has been proved to be a simple and effective method toattain visible-light photocatalysis [9]. However, most of studies onnitrogen doped TiO2considered that the nitrogen doping is onlya surface or sub-surface modification and difficult to narrow the.band gap in the bulk of TiO2, thus, it could only improve the visiblelight absorption in the range of 400-600 nm. It is really difficult toachieve the absorption in the wider region of 400-800 nm only bythe heterogeneous nitrogen doping
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