环境化学
孙剑辉,乔利平,孙胜鹏,祁巧艳,张干.氮掺杂型纳米TiO2在可见光及太阳光下的光催化性能研究[J].环境科学学报,2006,26(10):1688-1694
氮掺杂型纳米TiO2在可见光及太阳光下的光催化性能研究
- Studies on the photocatalytic activity of nitrogen-doped TiO2 under visible light and sunlight irradiation
- 基金项目：河南省重点科技攻关项目(No.0523032200)
- 作者
- 单位
- 孙剑辉
- 1. 河南师范大学化学与环境科学学院, 河南省环境污染控制重点实验室, 新乡 453007; 2. 中国科学院广州地球化学研究所有机地球化学国家重点实验室, 广州 510640
- 乔利平
- 河南师范大学化学与环境科学学院, 河南省环境污染控制重点实验室, 新乡 453007
- 孙胜鹏
- 河南师范大学化学与环境科学学院, 河南省环境污染控制重点实验室, 新乡 453007
- 祁巧艳
- 河南师范大学化学与环境科学学院, 河南省环境污染控制重点实验室, 新乡 453007
- 张干
- 中国科学院广州地球化学研究所有机地球化学国家重点实验室, 广州 510640
- 摘要：采用钛酸四丁酯为原料,以氨水水解-沉淀法制备出了氮掺杂型纳米TiO2催化剂(N/TiO2),以XRD、XPS、UV-Vis等手段对其进行表征;并通过对偶氮染料橙黄G的降解反应,研究了N/TiO2在可见光及太阳光下的光催化性能,探讨了pH值、外加H2O2氧化剂对光催化降解率的影响,并与P25型纳米TiO2进行了对比.结果表明,在可见光下,N/TiO2对橙黄G具有较高的催化活性,反应150min后降解率可达96.29%,显著高于P25型TiO2(42.55%);在太阳光下,N/TiO2对橙黄G的光催化降解速率较快,反应60min降解率与P25型TiO2基本相同,分别为99.37%、99.94%;较低的pH值环境并适量添加H2O2可显著提高N/TiO2催化效率,在可见光及太阳光下的最佳pH值均为2～3,最佳H2O2加入量分别为0.5mL·L-1、1.5mL·L-1.
- Abstract：Nanosized nitrogen-doped titania (N/TiO2)photocatalyst was prepared by calcination of the hydrolysis product of tetrabutyl titanate with ammonia as precipitator. The catalyst was characteristiced by XRD, XPS and UV-Vis absorption spectra. The photocatalytic activity of N/TiO2 under visible light and sunlight was studied by degradation of a model azo-dye Orange G. The effects of pH and addition of hydrogen peroxide on the degradation process were also investigated. The photocatalytic activity of N/TiO2 compared with P25-TiO2 was studied in the same condition. The results showed that N/TiO2 exhibited stronger photocatalytic activity than that of P25 under visible light irradiation, and the degradation rate reached 96.29% and 42.55% in 150min, respectively. On the other hand, the photocatalytic reaction was more rapid under sunlight, and the degradation rate with N/TiO2 and P25 reached 99.37% and 99.94% in 60min, respectively. In addition, the degradation was strongly enhanced with addition of H2O2 appropriately in acidic media. The optimal pH was 2～3 under different light sources. The optimal addition of H2O2 was 0.5mL·L-1 and 1.5 mL·L-1 under visible light and sunlight.
- Key words：nitrogen-doped nanosized titania photocatalytic activity orange G visible light sunlight degradation
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