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化学学报
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化学学报 ›› 2008, Vol. 66 ›› Issue (8): 879-884. 上一篇    下一篇

研究论文

载铂Sr(Zr1－xYx)O3－δ-TiO2异质结光催化剂模拟太阳光催化产氢

阎建辉*,1,2，刘强1,2，关鲁雄2，梁丰2，顾豪杰1   

  1. (1湖南理工学院化学化工系 岳阳 414000)
    (2中南大学化学化工学院 长沙 410083)
  • 投稿日期:2007-07-02 修回日期:2007-11-22 发布日期:2008-04-28
  • 通讯作者: 阎建辉

Photocatalytic Hydrogen Generation of Pt-Sr(Zr1－xYx)O3－δ-TiO2 Heterojunction under the Irradiation of Simulated Sunlight

YAN Jian-Hui*,1,2 LIU Qiang1,2 GUAN Lu-Xiong2 LIANG Feng2 GU Hao-Jie1   

  1. (1 Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414000)
    (2 School of Chemistry and Chemical Engineering, Central South University, Changsha 410083)
  • Received:2007-07-02 Revised:2007-11-22 Published:2008-04-28
  • Contact: AN Jian-Hui

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利用光化学还原法制备载铂Sr(Zr1－xYx)O3－δ-TiO2 (Pt-SZYT)异质结光催化剂, 采用XRD, SEM, UV-Vis, PL对催化剂的形貌及性能进行表征. 以工业有机污染物草酸为电子给体, 模拟太阳光下光催化产氢为探针, 评价了催化剂的活性. 研究了载铂量、草酸浓度对催化剂产氢活性的影响, 并探讨了Pt-SZYT催化剂产氢活性与光致发光(PL)性能的关系, 以及催化剂的连续使用效果. 结果表明: 模拟太阳光条件下, Pt-SZYT催化剂具有良好稳定的光催化产氢活性, 催化剂的最佳载铂量为0.90 wt%. PL分析表明Pt-SZYT的光催化产氢活性越高, 其荧光强度越弱. 草酸50 mmol•L－1, 催化剂用量1.0 g•L－1时, 催化剂(w＝0.90%) Pt-SZYT-70的平均产氢速率为1.68 mmol•h－1.

关键词: 异质结, 光催化, 产氢, 铂, 草酸

The Pt-Sr(Zr1－xYx)O3－δ-TiO2 (Pt-SZYT) heterojunction photocatalysts were prepared by a photodeposition method. The composite particles were characterized by XRD, SEM, UV-vis and PL techniques. Photocatalytic hydrogen generation in oxalic acid aqueous solution under the irradiation of simulated sunlight was used as a probe reaction to evaluate the photocatalytic activity of the photocatalysts. The effects of the content of Pt loading and the concentration of oxalic acid on the photocatalytic activity of the catalyst were discussed. The continuous photocatalytic activity of the Pt-SZYT and the relationship between PL intensity and hydrogen generation were also discussed. The results show that Pt-SZYT catalysts had high photocatalytic activity of hydrogen generation. The content of Pt loading and the concentration of oxalic acid have important influence on the photocatalytic hydrogen generation. The optimal loading content of platinum was 0.90 wt%. Under this condition, the average rate of photocatalytic hydrogen generation was 1.68 mmol•h－1 when the concentration of oxalic acid was 50 mmol•L－1. The higher the photocatalytic activity, the weaker the PL intensity, which was demonstrated by the analysis of PL spectra.

Key words: heterojunction, photocatalysis, hydrogen generation, Pt, oxalic acid