| N掺杂对TiO2形态结构及光催化活性的影响 |
| Effect of N-doping on Structure Chracteristics and Photocatalytic Activity of TiO2 Photocatalyst |
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| 摘要: 以TiCl4为钛源，采用酸催化水解法合成TiO2前驱体，在NH3/N2气氛下经不同温度处理制得浅黄色的N掺杂TiO2(TON)光催化剂。以苯酚为模型物，考察了催化剂在紫外光区、可见光区及太阳下催化活性；采用DRS、XPS、XRD、FTIR、SEM及低温氮物理吸附对光催化剂的晶相结构、光谱特征和表面结构等进行表征。系统研究了N掺杂对TiO2形态结构及光催化活性的影响。结果表明，掺杂N以阴离子形式进入TiO2体相中置换晶格中的O，适宜温度下制得适量N掺杂的TON在紫外光区、可见光区及太阳光下均表现出较高的活性。N掺杂在TiO2表面生成Ti-O-N键，形成新的能级结构，使催化剂的吸收红移至450～550 nm，诱发TiO2可见光催化活性。同时高温下煅烧，N掺杂可抑制TiO2晶粒生长，减缓TiO2粒子间团聚，提高锐钛矿相向金红石相转变温度，减缓相转化速度。 |
| 关键词: TiO2 氮掺杂 热处理 可见光 光催化剂 |
| 基金项目: |
| Abstract: The nitrogen doped TiO2 photocatalyst(TON) with visible-light response were prepared by acid catalyzed hydrolysis followed by calcination in NH3/N2 atmosphere. The photocatalytic activity of the TON and TiO2 were investigated through degradation of phenol under artificial ultraviolet light, visible light and solar light irradiation, respectively. DRS, XPS, XRD, FTIR, SEM and N2 adsorption isotherm were used for catalyst characterization. The results show that anion N are incorporated into TiO2 lattice and substitute for parts of O. TON with suitable N-doping and calcination temperature exhibited high activity under ultraviolet light, artificial visible light and solar light irradiation. Doped-N could form a new bond enrgy level above the valence band of TiO2 which can extend the adsorption edge to 450～550 nm. In addition, doped-N could be beneficial for TiO2 dispersion, increase SBET and retard phase transformation. |
| Keywords: TiO2 nitrogen doping heat treatment visible light photocatalyst |
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| 摘要点击次数: 1239 |
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| 刘守新,陈孝云,李晓辉.N掺杂对TiO2形态结构及光催化活性的影响[J].无机化学学报,2008,24(2):253-259. |
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