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化学学报
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化学学报 ›› 2008, Vol. 66 ›› Issue (8): 943-946. 上一篇    下一篇

研究论文

纳米复合氧化物催化发光法测定空气中的甲醛

周考文*，周宇，孙月，田雪娇   

  1. (北京联合大学生物化学工程学院 北京 100023)
  • 投稿日期:2007-08-20 修回日期:2007-12-05 发布日期:2008-04-28
  • 通讯作者: 周考文

Determination of Formaldehyde in Air Utilizing Cataluminescence by Nanometer Composite Oxide

ZHOU Kao-Wen* ZHOU Yu SUN Yue TIAN Xue-Jiao   

  1. (Biochemical Engineering College, Beijing Union University, Beijing 100023)
  • Received:2007-08-20 Revised:2007-12-05 Published:2008-04-28
  • Contact: ZHOU Kao-Wen

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基于纳米复合氧化物上甲醛被催化氧化产生化学发光的现象, 建立了直接测定空气中微量甲醛的方法. 实验发现, 甲醛在许多纳米级金属氧化物表面都有发光现象, 但在纳米级钼钒钛(原子比为2∶3∶5)复合氧化物表面上有较高的发光强度和较好的选择性. 最佳实验条件为: 分析波长535 nm, 测定温度265 ℃, 载气流速150 mL/min. 方法的检测限(3σ)为0.04 mg/m3, 线性范围为0.07～34 mg/m3, 相关系数为0.9994, 回收率为98.2%～101.4%. 对常见共存物的研究发现, 除丙酮外, 苯、氨、二氧化硫和乙醇不干扰测定.

关键词: 甲醛, 催化发光, 纳米复合氧化物

A novel method based on cataluminescence (CTL) generated on the surface of a nanometer composite oxide was proposed for direct determination of formaldehyde in air. The CTL intensity and selectivity for the determination of formaldehyde on nano-MoO3-V2O5-TiO2 at an atomic ratio of Mo∶V∶Ti of 2∶3∶5 are bigger and better than those on other nanosized composite oxides. The optimum experimental conditions were tested for nano-Mo4V6Ti10O47. Selective determination could be achieved at a wavelength of 535 nm. The surface temperature of the nanometer materials was about 265 ℃. The flow rate of air carrier was around 150 mL/min. The limit of detection of this method was 0.04 mg/m3. The linear range of CTL intensity versus concentration of formaldehyde was 0.07～34 mg/m3, and the correlation coefficient was 0.9994. The recovery of 6 testing standard formaldehyde samples by this method was 98.2%～101.4%. Common coexistence matters, such as benzene, ammonia, sulfur dioxide and ethanol, did not disturb the determination of formaldehyde, except acetone. This method allows rapid determination of formaldehyde in air.

Key words: formaldehyde, cataluminescence, nanometer composite oxide