研究生: |
林綉禎 Hsiu-Chen Lin |
---|---|
論文名稱: |
奈米光觸媒多孔隙混凝土空氣淨化研究 Application of Nano Photocatalyst Porous Concrete on Air Purification |
指導教授: |
楊錦懷
Chin-Huai Young |
口試委員: |
黃兆龍
Chao-Lung Hwaung 賴宏仁 Hong-Jen Lai |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 149 |
中文關鍵詞: | 二氧化鈦 、光觸媒 、空氣淨化 、二氧化氮 、多孔隙混凝土 |
外文關鍵詞: | TiO2; nano-photocatalyst; air purification; NO2; |
相關次數: | 點閱:366 下載:4 |
分享至: |
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環境淨化已成為各國最重視的課題,而奈米光觸媒具有改善大氣環境污染之功效,為目前最有效且無副作用之空氣淨化材料。本研究將光觸媒結合多孔隙混凝土為一種室外空氣淨化材料,並將光催化反應之影響因子模擬為試驗操作參數,包含:不同孔隙率之多孔隙混凝土、不同紫外光強度及氧化矽之使用等,並以水洗方式探討光觸媒之回復性能;透過試驗評估光觸媒材料於常溫低濕下之空氣淨化效能。
本研究結果顯示;二氧化氮濃度受到測試箱內壁及混凝土試體吸附影響,早期降解速度稍快,後期降解速度則較為緩慢。由二氧化氮降解各項試驗中得知,紫外光強度越大光催化反應速率越快。水洗前之二氧化氮降解速度比水洗後快,但各組水洗回復率仍可達到八成以上;且以含有氧化矽之奈米光觸媒多孔隙混凝土(試驗組二)之二氧化氮降解速度較快。光觸媒與混凝土之塗佈中間層有助提高耐久性。孔隙率會影響光觸媒成膜及附著狀況,間接影響光催化反應效率;孔隙率越小漿量越多,比表面積越小,光觸媒含量少,故光催化反應速率慢;而孔隙率越大漿量越少,比表面積越大,光觸媒含量雖較多,但因孔隙率過大,部分光觸媒無法吸收到光能而激發產生光觸媒效用;試驗結果得知,奈米光觸媒多孔隙混凝土於孔隙率15%及20%下空氣淨化效能最好。依據統計分析結果顯示孔隙率在20%時淨化空氣能力為最佳。
The environmental purify has become the most important issue among all the countries. The nano-photocatalyst has the ability to improve the environmental problem such as air pollution. At present, due to no side effect occur the nano-photocatalyst has widely applied to air purification. The study focus on application of Photocatalyst combines with the porous concrete as outdoor air purification material to solve the air pollution problem of Taiwan. To evaluate the photocatalysts reaction under conditions of low humidity and room temperature, the three variables, air voids of porous concrete, intensity of UV light, and factor of SiO2, were considered. Moreover, the reversion efficiency was investigated by perform the water clean method.
The test results show that amount of adsorption of NO2 is affected by box wall and porous concrete. Thus, the degradation speed of initial stage is faster then later stage. As expected, the high intensity UV light result in a high photocatalysts reaction. The test result shows that before water clean the porous concrete has faster degradation speed than after water clean one. However, the reversion efficiency for each test groups has upward to 80%. Furthermore, the porous concrete that surface treating by SiO2 and then coating nano-photocatalyst has high degradation performance. Therefore, the middle layer as SiO2 can helps the long term durability. The nano-photocatalyst of situations of film formation and adhesion is affected by the air voids of porous concrete, and result in different photocatalysts reaction. Based on test results indicating the air voids of porous concrete at 15% and 20% have excellent ability of air purification. In according the statistical analysis show that 20% air voids was recommended to be the appropriate air voids contend.
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