便攜型空氣清淨機對空氣中甲醛進行光降解之研究

甲醛含有高揮發性以及毒性，容易使人致癌，而現今社會室內建材黏著劑甚至衣物為了防腐防蟲，都有可能添加甲醛或是含有甲醛成分的原料及添加劑，環保署也建議室內甲醛濃度應該在0.1 ppm以下，因此想設計一個能夠隨身攜帶的小型空氣清淨機，盡可能減少甲醛與其他揮發性有機溶劑造成的危害。由於大氣中的甲醛容易氧化成甲酸，所以難以直接偵測氣態的甲醛。本研究是先直接注射甲醛液體至氣相層析儀中進行分析得知相對實際甲醛濃度應有的訊號大小，並且建立甲醛氣體濃度的檢量線，我們利用奈米化二氧化鈦經由特定波長之紫外光光源可以催化分解空氣中有機汙染物的特性，使用試作便攜式空氣清淨機，分別由電漿化學沉積法的二氧化鈦之不銹鋼板、內嵌波長三百九十奈米的紫外燈軟板之不銹鋼板以及一組風扇組成，將此裝置置於一個兩升聚丙烯空氣箱中，並將固定體積之甲醛水溶液揮發於空氣箱中，藉由氣相層析-火焰離子偵測器偵測甲醛的訊號，開啓空氣清淨機後，進行持續觀察甲醛的訊號，並且記錄實驗結果。

關鍵字

甲醛；氣相層析；室內空氣污染物；光催化降解

並列摘要

A gas at room temperature, formaldehyde is colorless and has a characteristic pungent, irritating odor. There are many indoor building materials, adhesives, even clothing may be added formaldehyde to anticorrosive and pest control. In view of its widespread use, toxicity and volatility, exposure to formaldehyde is a significant consideration for human health. The Environmental Protection Agency (EPA) also suggested the indoor formaldehyde’s concentration should be controlled below 0.1 ppm. Now we design a portable air-cleaner to reduce the formaldehyde and other Volatile Organic Compounds (VOC) as possible. Due to the formaldehyde in air was oxidative into fomic acid. It’s hard to detect the concentration of gaseous formaldehyde directly. In this study, we inject formaldehyde solution directly into Gas Chromatography- Flame Ionization Detector (GC-FID) to know how much the peak area of the theoritical concentration for formaldehyde, and improve baseline of chromatogram. Then we establish calibration curve of gaseous formaldehyde, as well as solve the degradation of formaldehyde temporarily. According to character of photocatalyst (Titanium dioxide, TiO2), we design a air-cleaner consists of a piece of stainless steel with plasma-sputtering TiO2, a piece of stainless steel with flexible plate of 390-nm wavelength UV-light and a fan. We put this device and a glass dish in a 2L PP (polypropylene) gas box, transfer formaldehyde solution and drop on the glass dish. Then use heater to evaporate it. The concentration of formaldehyde was analyzed by Gas Chromatography-Flame Ionic Detector (GC-FID) to record the result.

並列關鍵字

formaldehyde ； gas-chromatography ； indoor pulltant ； photodegradation

參考文獻

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便攜型空氣清淨機對空氣中甲醛進行光降解之研究

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