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題名 | 陰離子對以鐵金屬置換廢水中銅離子反應之影響=The Effect of Anions on the Removal of Copper Ion from Wastewater by Iron Cemention |
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作者 | 李嘉菘; 顧洋; | 書刊名 | 中國環境工程學刊 |
卷期 | 7:2 1997.06[民86.06] |
頁次 | 頁193-201 |
分類號 | 445.462 |
關鍵詞 | 化學置換法; 銅離子; 陰離子; Cementation; Displacement; Copper removal; Anion; |
語文 | 中文(Chinese) |
中文摘要 | 本研究主要為探討在不同溶液條件下,改變溶液pH值、反應溫度、不同陰離子種 類及濃度時,對於以鐵為犧牲金屬,置換去除水溶液中的銅離子反應所造成的影響。由實驗 結果顯示, 在鐵粉過量下, 銅離子的去除率受硫酸根及氯離子之影響不大,且大都可達到 95 %以上; 硫酸根及氯離子存在時,反應初期蝕刻所增加之表面積大於沈積減少之表面積 ,使置換反應速度反而增高,可用去活化模式模擬置換反應之動力行為。硝酸根存在時,由 於硝酸根亦參與氧化還原反應,而大幅降低銅離子之去除效率。反應速率以經驗動力方式表 示較佳。固相 XRD 分析顯示銅以原子態在鐵金屬表面還原,而 SEM 分析結果則顯示沉積銅 多為顆粒狀,重疊沉積在鐵粉表面。鐵金屬表面會形成凸起的沉積銅及蝕刻的鐵凹槽,當鐵 離子自表面擴散出來的阻力過大時,反應速率減慢基至終止。 |
英文摘要 | The effect of anions on the cementation of copper ion by iron powder were studied under various solution conditions to investigate the kinetics of the reaction and the morphology of cemented deposits. The experimental results indicate that high degress of removal (>95%) of copper ion could be achieved by iron cementation in the presence of sulfate and chloride ions, and the cementation rate of copper ion on iron powder could be adequately expressed by the deactivation model. For solutions containing nitrale, the cementation of copper ions was significantly inhibited; excess dissolution of iron was supposedly to be caused by the reduction of NO ﹣�� and Fe �纂�. Because of the interference caused by the presence of nitrate, the rate is expressed by an empirical power law. Analysis of the cemented deposits by XRD and SEM indicated that the copper deposits on iron were almost all in the form of copper molecules. The morphology of copper deposits was found to be a sponge-like amorphorus structure. |
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