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頁籤選單縮合
題 名 | Effect of Water-Soluble Masking Agents on Ion Exchange of Heavy Metals from Sulfate Solutions=添加水溶性遮蔽劑對重金屬離子交換之影響 |
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作 者 | 莊瑞鑫; 王怡杰; 高向前; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷 期 | 33:4 2002.07[民91.07] |
頁 次 | 頁333-340 |
分類號 | 341.3723 |
關鍵詞 | 遮蔽劑; 重金屬離子; 離子交換樹脂; Metal separation; Cation exchange; Masking agents; EDTA; NTA; IDA; Citrate; |
語 文 | 英文(English) |
中文摘要 | 一般的強酸性陽離子交換樹脂如Amberlite IR-120,通常無法有效分離水溶液中之重金屬離子。本論文提出以EDTA、NTA、IDA及Citrate為遮蔽劑,說明其如何能大幅提昇等莫耳雙成份重金屬離子(Zn2+/Cu2+、Co2+/Ni2+)之交換分離效能。實驗時固定遮蔽劑與總金屬離子濃度比值為1/2,並改變溶液初始pH值範圍為1.0~6.0。結果顯示,溶液pH值對分離效能提昇之程度有決定性的影響。本文根據重金屬離子與遮蔽劑間作用之強弱(以其總體形成常數值表示),提出一個參數,試圖將不同重金屬離子組對與遮蔽劑間之交換選擇性加以關聯。這個參數使吾人針對某一個特定之重金屬離子組對,能選出適當之遮蔽劑以進行有效地分離。 |
英文摘要 | Metal separation using conventional cation exchange resins, such as Amberlite IR-120, is usually unsatisfactory. In this work, effective exchange separation of two pairs of binary metals (Zn2+/Cu2+ and Co2+/Ni2+) from equimolar sulfate solutions was investigated using ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), iminodiacetic acid (IDA), and citrate as masking agents. Experiments were carried out at different aqueous pH values (1~6) and a fixed concentration ratio of masking agent to total metals of 0.5. It was found that the extent of enhancement strongly depended on the solution pH. A parameter that involves the overall formation constants of the masking ligands with two metals is proposed to correlate the exchange selectivities obtained between the tow metal pairs and different masking agents. This correlation allows the selection of suitable type of masking agent for effective separation of a given pair of heavy metals. |
本系統中英文摘要資訊取自各篇刊載內容。