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| 題 名 | Effect of Iron Content on Bimetallic Iron-Aluminum Particles for Dechlorination of Carbon Tetrachloride=鐵含量對鐵鋁複合金屬還原降解四氯化碳作用之探討 |
|---|---|
| 作 者 | 李文善; 謝彩虹; 卓裕盛; 連興隆; | 書刊名 | 中國環境工程學刊 |
| 卷 期 | 16:3 民95.05 |
| 頁 次 | 頁159-166 |
| 分類號 | 445.259 |
| 關鍵詞 | 還原脫氯; 零價金屬; 鋁; 四氯化碳; 氧化鋁; 地下水復育; Dechlorination; Zero-valent metals; Aluminum; Carbon tetrachloride; Aluminum oxide; Groundwater remediation; |
| 語 文 | 英文(English) |
| 中文摘要 | 在地下環境中,零價鐵金屬已被成功的使用在有機性環境污染之脫氯降解。然而,由於鐵表面氧化性沉澱物的生成,使零價鐵的反應性會逐漸降低,成了影響本技術的關鍵因素之一。在本論文中,我們探討可有效降解四氯化碳的創新材料,鐵鋁複合金屬。鐵鋁複合金屬是將三價鐵離子於酸性條件下,還原為元素鐵後,附在鋁金屬表面。此一複合金屬的設計是利用零價鋁做為電子供應者,提供電子來避免因鐵生鏽作用造成表面鈍化膜的生成,以維持鐵的表面反應性。本研究採用鐵含量介於5-45%(理論重量比)之鐵鋁複合金屬,XRD分析證實:在金屬表面沒有氧化鐵或氧化鋁的生成;當鐵含量為15%時,整個鋁金屬表面為最少量的零價鐵所完全包覆。四氯化碳降解的批次實驗指出:鐵含量為15%之鐵鋁複合金屬有最佳的處理效果,過高或太低的鐵含量將不利於鐵鋁複合金屬的處理效果。此外,鐵鋁複合金屬的脫氯降解反應受pH所影響。 |
| 英文摘要 | Zero-valent iron has been successfully used for the dechlorination of organic environmental contaminants in subsurface. However, the accumulation of hydroxide precipitates onto the iron surface resulting in the loss of iron reactivity over time has emerged as a critical issue that needs to be addressed. In this paper, we present a novel material, bimetallic Fe/Al particles, for effective degradation of carbon tetrachloride. Bimetallic Fe/Al was prepared under acidic conditions where zero-valent iron was readily deposited onto aluminum surface. The bimetallic Fe/Al particles are designed to take advantage of zero-valent aluminum for serving as an electron donor to prevent the formation of a passive layer from iron corrosion and maintain the surface reactivity of iron. In this study, a theoretical iron content ranging from 5 to 45% (by weight) was conducted. X-ray diffraction (XRD) analysis indicated neither iron oxide nor aluminum oxide was formed at the metal surface. A minimum full surface coverage of iron at the aluminum surface was determined when the iron to aluminum ratio was 15% according to XRD measurements. Batch experiments, that were carried out to investigate the product distribution and reaction kinetics for the dechlorination of carbon tetrachloride by bimetallic Fe/Al, indicated bimetallic Fe/Al particles at the iron to aluminum ratio of 15% exhibited optimum performance. Excessive or insufficient amounts of iron deteriorated the effectiveness of bimetallic Fe/Al. A pH-dependent dechlorination by bimetallic Fe/Al was found. |
本系統中英文摘要資訊取自各篇刊載內容。