結合可見光光觸媒單元與活性碳單元處理車內VOCs之研究

Study on the In-Car VOCs Treatment with Combining Mesopourous TiO2 Photocatalyst and Activated Carbon

張章堂(Chang-Tang Chang) ； 沈百淳(Bai-Chun Shen) ； 李承志(Cheng-Chih Li) ； 余佳蘋(Jia-Pin Yu) ； 駱勇全 ； 李雅文

《國立宜蘭大學工程學刊》 5期 (2009/03) Pp. 115-130

https://doi.org/10.6176/BCE.2009.05.18

摘要

揮發性有機化合物（Volatile Organic Compounds, VOCs）屬有毒化學質，普遍存在戶外與室內空氣中，甚至於車內。室內與車內VOCs濃度通常為其戶外濃度之2～5倍，故人體健康之危害頗值加以重視。因車輛之動力系統較低，故頗需良好處理系統進行VOCs控制。本研究利用活性碳對VOCs吸附能力頗高的優點，與光觸媒具備降解有機污染物之功能，將兩種處理系統進行整合，發揮兩種處理單元之優點。因此本研究目的乃設計一反應器，將活性碳卡匣及TiO2填充床以串聯方式聯接，利用活性碳及TiO2光觸媒之反應性質，加以改善車內空氣品質。由本實驗結果可知，含鈦光觸媒於不照光下，甲苯在2分鐘反應時間後，其去除率為14.2%；當照光時，去除效率為74.1%；而含鈦光觸媒照光並與活性碳結合時，其去除效率可高達98.5%。

關鍵字

揮發性有機化合物 ； 光觸媒單元 ； 活性碳單元 ； 填充床

並列摘要

Volatile organic compounds are toxic chemistry matters which exist in outdoor and indoor generally, even in car. In Taiwan, in car concentrations of VOCs were roughly more than 2~5 times of outdoor concentrations, so it is worthy to protect human health from hazarding by treating those VOCs. However, the power system of automobile is lower and results in a problem to control in car VOCs. It is interesting to reduce in car VOCs emission effectively with high efficiency and long time effectiveness control techniques, such as reasonable and low cost control techniques- UV/TiO2 with activated carbon control system. The study utilized the advantage of high adsorbed ability of activated carbon and high long-term performance of photodegradation of TiO2 photocatalyst to develop the hybrid reactor for improving the in car air quality. The tested concentrations of VOCs were ranged from 600, 1000 and 1400ppm. Additionally, the temperatures were operated from 15°C to 35°C. The examined pollutants were toluene, xylene and ethyl benzene, respectively. The results showed that the toluene removal rate with TiO2 photocatalyst were 14.2% under not illumination. The removal rate could be up to 74.1 % under illumination. Furthermore, the removal rate were higher than 98.5% when combining TiO2 photocatalyst with activated carbon under illumination.

並列關鍵字

VOCs ； photo-catalytic ； packing bed ； activated carbon