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頁籤選單縮合
題名 | 以零價金屬進行水中五氯酚去氯處理=Dechlorination of Pentachlorophenol by Zero-Valent Metals |
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作者 | 賴慧琳; 劉聰德; 龔佩怡; 李美貴; 余光昌; Lai, H. L.; Liou, T. D.; Kung, P. Y.; Lee, M. K.; Yu, K. C.; |
期刊 | 嘉南學報. 科技類 |
出版日期 | 20031200 |
卷期 | 29 民92.12 |
頁次 | 頁65-76 |
分類號 | 445.259 |
語文 | chi |
關鍵詞 | 零價金屬; 五氯酚; 去氯還原; 雙金屬組合; Zero valent metal; Pentachlorophenol; Reductive dechlorination; Bimetallics; |
中文摘要 | 本研究係以批次試驗探討零價金屬及雙金屬組合對水中五氯酚(PCP)之去氯還原處理之效果及動力學研究。結果顯示,添加Fe□顆粒於含PCP水溶液中,其pH值隨著時間的增加而增加,直到pH值達9.0左右而趨於穩定。添加Zn□□顆粒或Zn□(顆粒)/Pd□(粉末)於含PCP水溶液中,其pH值則隨著時間的增加而緩慢增加,且增加幅度很小,pH值僅達7.0左右。氯酚類化合物與Fe□及Zn□顆粒之反應時,氯酚類化合物吸附在Fe□顆粒及Zn□顆粒的含量以反應初期最高,隨後逐漸降低。Fe□顆粒對水溶液中PCP似乎沒有去氯還原的效果,Zn□顆粒對水溶液中PCP之去氯還原的效果則非常顯著,其去氯反應可由動力試驗結果看出其依序去氯之反應途徑。以雙金屬組合(Zn□顆粒/Pd□粉末),來探討對PCP之去氯還原的效果時,水溶液中氯酚類化合物依序去氯之變化更為明顯,PCP的減少速率也加快。吸附在Fe□顆粒表面之PCP比其在水溶液中容易被去氯還原。吸附在Zn□顆粒之氯酚類化合物被去氯還原之速度比在Fe□顆粒表面為快,也比與Zn□反應後水溶液中氯酚類化合物之去氯還原反應為快。吸附在零價金屬顆粒之氯酚類化合物雖較少,但其被去氯還原之效率比其在水溶液中時為高。 |
英文摘要 | The aim of this study is to explore the dechlorination effects and kinetics on pentachlorophenol (PCP) by using zero valent metals (ZVM) and bimetallics bia batch tests. Results indicate that the pH of the solution with PCP and Fe□ (granular) increased with increase of time until the pH had steadied at around 9.0 whereas the pH of the solution with PCP and Zn□ (granular) or PCP with Zn□ (granular)/Pd□ (powder) increased slowly with time and finally steadied at around 7.0. After reacting with Fe□, Zn□ or Zn□/Pd□, it can be found that there was about 30% of initial absorption of chlorophenols onto the surface of Fe□ or Zn□ and then gradually decreased with time. Zn□ and Zn□/Pd□ showed a higher reductive dechlorination effect on chlorophenols in solution than Fe□ did. On the basis of kinetics, a pathway of sequential reductive dechlorination could be found in the system of Zn□ or Zn□/Pd□ in reaction with PCP. The rate constant of PCP loss in the system of Zn□/Pd□ with PCP was 60% higher than that of Zn□ with PCP, which reveals that maybe the catalysis of Pd□ could enhance the loss of PCP. PCP absorbed onto the surface of Fe□ was more dechlorinated than that in solution after a long reaction time. Zn□ also had a higher dechlorination effect on the absorbed PCP than that in solution. |
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