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| 題 名 | Fluoride Removal from Water with Iron-Coated Spent Catalyst=鐵被覆廢觸媒去除水中氟離子 |
|---|---|
| 作 者 | 蔡長益; 劉志成; | 書刊名 | 中國環境工程學刊 |
| 卷 期 | 9:2 1999.06[民88.06] |
| 頁 次 | 頁107-114 |
| 分類號 | 468.8 |
| 關鍵詞 | 吸附; 氟離子; 鐵被覆; 酸鹼值; 廢觸媒; Adsorption; Fluoride; Iron-coating; PH; Spent catalyst; |
| 語 文 | 英文(English) |
| 中文摘要 | 我們研究鐵被覆廢觸媒去除水中氟離子的可行性,總共利用並比較三種不 同的鐵被覆程序,即加熱法、沈澱法,與吸附法之差異優劣,我們首先定性經鐵被覆之之觸 媒表面,並比較吸附水人氟離子之強弱,發現加熱法可以被覆最高量鐵,同時也具有最高吸 附密度,鐵被覆可以明顯增加之廢觸媒對氟離子之吸附,整個吸附反應受酸鹼值影響很大, 並可以蘭米爾等溫吸附模式描述,陰離子透過競爭及改變表面性質,亦影響吸附反應,經鐵 被覆之廢觸媒對氟離子之吸附密度可與商業吸附劑比擬,實驗結果顯示鐵被覆廢觸媒極具開 發為次級吸附的潛力。 |
| 英文摘要 | The feasibility of utilizing iron-coated spent catalyst for the removal of fluoride from water was studied. Three different methods were utilized to coat iron onto the spent catalyst. The characteristics of the surface of the spent catalyst were changed significantly through coating with 0.1 and 0.5 M Fe(NO �� ) �� aqueous solutions, respectively. The iso-electric point (IEP) shifted from pH 2.5 tp a more alkaline range (ca. 7.0). A significant increase in the fluoride removal capacity of the spent catalyst was achieved through iron salt coating. The removal capacity of fluoride increased with increasing conentration of iron. The adsorption reaction of fluoride was affected by pH, and the optimum pH for fluoride removal ranged from 5.5 to 6.0. Langmuir adsorption isotherm was utilized to describe the equilibrium adsorption reaction at pH 5.5 Results show that the spent catalyst can potentially be developed into a secondary adsorbent for the removal of fluoride from aqueous solution. |
本系統中英文摘要資訊取自各篇刊載內容。