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分析化学 2010

纳米颗粒的超临界干燥法制备及用于醋酸乙烯蒸气的催化发光检测

, PP. 771-777

王亚丽,曹小安,刘永慧,彭燕

Keywords: 催化发光,MgO纳米材料,醋酸乙烯,超临界流体干燥,气体传感器

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Abstract:

利用乙醇超临界流体干燥技术(SCFD)(280℃×7.0MPa×30min)制备了纳米MgO及Y2O3颗粒,发现其对一些有害气体的催化发光强度远高于普通干燥技术制备的纳米MgO及Y2O3。设计了一种以SCFD技术合成的纳米MgO为敏感材料,催化发光检测醋酸乙烯蒸气的传感器。此传感器具有很高的灵敏度及优异的选择性,在温度279℃、波长425nm、空气流速为160mL/min的最佳条件下,催化发光强度与醋酸乙烯蒸气浓度在1.8～1800mg/m3内呈良好的线性关系,检出限为0.7mg/m3。当浓度相同的丙酮、乙醛、乙酸乙酯、乙酸、甲醛、氨水、乙醇、苯和甲醇蒸气通过此传感器时,除乙醇引起3.56%的干扰外,其它气体基本不干扰醋酸乙烯的测定。应用本方法可快速测定车间空气中的醋酸乙烯。

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