現代社會因生活型態的改變，人們長期間處於室內環境中，因此，如何提升室內空氣品質對人們而言至關重要。臭氧為室內空氣汙染物之一，人們長期暴露於臭氧下容易造成心血管及呼吸道相關疾病，亦有可能提升致死率。咖啡為現代人的日常飲品，且為世界第二大交易量的貨品。多項文獻指出咖啡渣除了可製備為生質活性碳並用於去除汙染物外，未經碳化處理的咖啡渣也可用於去除水中重金屬汙染物。本研究以被動式去除臭氧的概念，分析固態咖啡及液態咖啡於長時間下對於室內臭氧的移除效率及沉積速度。其中，固態咖啡的尺寸分為細咖啡粉、粗咖啡粉、及咖啡豆；液態咖啡則為常見的咖啡飲品；此外，本研究也納入活性碳粉、鹽水、及純水作為對照組。結果顯示活性碳粉的臭氧移除效率可達約50%，咖啡粉的臭氧移除效率則與粒徑有直接相關，細咖啡粉的臭氧移除效率為約57%，粗咖啡粉的臭氧移除效率約為41%，咖啡豆的臭氧移除效率則約為31%。另一方面，液態咖啡、鹽水、與純水的臭氧移除效率分別約為34%、12%、和8%。此外，活性碳粉、細咖啡粉、粗咖啡粉、咖啡豆、液態咖啡、鹽水、及純水對於臭氧的沉積速度分別約為0.46 cm/s 、0.60 cm/s、0.31 cm/s、0.20 cm/s、0.23 cm/s、0.06 cm/s、及 0.04 cm/s。 從比表面積及孔隙分析的結果指出，活性碳粉的比表面積及孔徑因為氧化後減少，但細咖啡粉經長時間的氧化後則使比表面積增大。且從能量散射光譜分析結果顯示，細咖啡粉相較於粗咖啡粉，其表面氧化程度較高。從X射線光電子能譜中亦能發現經臭氧反應後，細咖啡粉及活性碳粉因氧化產生了羧基、酚羥基、及醌基的化學位移，說明經實驗後兩材料表面受臭氧氧化作用較為明顯。而粗咖啡粉較無明顯特徵氧化峰產生，說明表面氧化程度，相較於活性碳及細咖啡粉而言較不平均，使其移除效率較低。根據實驗及化學檢驗結果可說明，固態及液態咖啡能不經特殊處理，即可與臭氧反應並降低臭氧濃度，未來可作為一般居家環境中能方便取得且能有效降低室內臭氧之被動式材料。

In modern society, people spend lots of time indoors. Therefore, improving the indoor air quality is significant for people. Ozone is one of the indoor air pollutants that will cause respiratory diseases, cardiovascular diseases, and even the mortality. Coffee is the daily drink for people and the second most traded farm product in the world. Many studies have shown that coffee grounds can be prepared as activated carbon to remove pollutants, and coffee grounds that has not been carbonized can also be used to remove heavy metal pollutants in water. This research uses the concept of passive removal of ozone to analyze the coffee for a long-time removal ozone efficiency and ozone deposition velocity. The research uses the solid and liquid types of coffee as the experimental materials. The solid coffee includes coarse coffee powder, fine coffee powder, and coffee bean. All of them are compared with the activated carbon, seawater, and deionized water. The results show that the activated carbon powder can remove ozone by 50% and the fine coffee powder can remove ozone by 57%. The coarse coffee powder and coffee bean can remove ozone by 41% and 31% respectively. The liquid coffee, seawater, and deionized water can remove ozone 34%, 12%, and 8% respectively. Furthermore, the activated carbon powder, fine coffee powder, coarse coffee powder, coffee bean, liquid coffee, seawater, and deionized water has a deposition velocity of respectively 0.46 cm/s, 0.6 cm/s, 0.31 cm/s, 0.20 cm/s, 0.23 cm/s, 0.06 cm/s, and 0.04 cm/s. The analysis of BET shows that the specific surface areas and pore size of activated carbon powder decreases after the test. But the specific surface areas and pore size of the fine coffee powder increases after the test. By the EDS analysis, the oxidation degree of fine coffee powder is higher than coarse coffee powder. Furthermore, the XPS analysis shows that the energy spectrum of activated carbon powder and fine coffee powder has peaks of carboxyl, phenolic hydroxyl, and quinone after the ozone test. The results show that the surface of activated carbon powder and fine coffee powder is ozonized more obviously. The coarse coffee powder has not shown the characteristic oxidation functional group after experiment. It shows that the surface oxidation degree of coarse coffee powder is more uneven than the activated carbon and fine coffee powder. Cause the removal efficiency of coarse coffee powder is lower than activated carbon and fine coffee powder. According to the results, coffee can react with ozone and can be the passive material to remove indoor ozone for the indoor environment.

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