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題 名 | 鹽度與鈉離子對懸浮二氧化鈦氧化水中氨之影響=Effects of Salinity and Sodium Ion on the Photocatalytic Oxidation of Ammonia by Suspended Titanium Dioxide in Water |
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作 者 | 謝介士; 葉瑾瑜; 陳紫媖; | 書刊名 | 水產研究 |
卷 期 | 15:2 2007.12[民96.12] |
頁 次 | 頁91-97 |
分類號 | 439.6 |
關鍵詞 | 光觸媒氧化作用; 二氧化鈦; 氨氮; 海水; 鹽度; 鈉離子; Photocatalytic oxidation; Titanium dioxide; Ammonia; Sea water; Salinity; Sodium ion; |
語 文 | 中文(Chinese) |
中文摘要 | 氨是水產動物的主要代謝產物,具有很強之毒性,因此在養殖系統中必須去除。本報告即設計以磁石攪拌器攪拌使光觸媒二氧化鈦懸浮,並以PL型之UV-A光源來激發二氧化鈦,使產生電子與電洞,以試驗探討在海水中以懸浮二氧化鈦氧化氨之功效。由試驗結果可知,海水中的氨可以被二氧化鈦氧化成亞硝酸鹽及硝酸鹽,在2 L的燒杯內裝2 L的含總氨氮3.5 mg/L之海水,以1 g/L二氧化鈦及Philips 9W PL型UV-A燈管處理之,其最高之氧化速率是0.25 mg/hr,且在鹽度12 psu以下,二氧化鈦對氨之光觸媒氧化作用速率,隨鹽度增加而加快,在鹽度12 psu以上,光觸媒氧化作用速率則趨於穩定。試驗中亦發現水中之鈉離子可以促進二氧化鈦對氨之氧化作用速率,這可能是鈉離子可以接受二氧化鈦被UV-A光源所激發的電子,而降低二氧化鈦中被激發的電子與電洞再結合有關。但當鹽度太高,則鈉離子的濃度可能已超過接受二氧化鈦中被激發電子所需的量,亦可能是已與鈉離子結合的電子,又與電洞反應。因此在高鹽度下,二氧化鈦對氨的氧化速率不再提高。 |
英文摘要 | Ammonia is a major metabolic product by aquatic organisms, which is highly toxic, therefore it must be removed from the aquatic ecosystem. A new photocatalytic system was designed to remove ammonia from water in this study. Titanium dioxide was suspended by magnetic stirrer and excited by PL type UV-A lamp light to produce free electron and electron hole. The photocatalytic oxidation of ammonia in sea water was measured in the experiment, which ammonia could be oxidized to nitrite and nitrate in sea water. The photocatalytic oxidation rate of ammonia was 0.25 mg/hr in 2 liter seawater with one PL type 9W UV-A lamp of Philips and 2 g titanium dioxide. The photocatalytic oxidation rate of ammonia increased with salinity when salinity was lower than 12 psu, and the rate was stable when salinity was higher than 12 psu. Sodium ion in sea water could enhance the photocatalytic oxidation rate of ammonia from titanium dioxide. It was because the active ion of titanium dioxide may be trapped by sodium ion and therefore enhanced the photocatalytic oxidation rate of ammonia in photocatalytic experiment. However, when salinity is too high, the concentration of sodium ion is over the demand of active ion or the active ion trapped by sodium ion which reacted with electron hole again. Therefore, the photocatalytic oxidation rate of ammonia did not increase under this high concentration of sodium. |
本系統中英文摘要資訊取自各篇刊載內容。