以二（2-乙基己基）磷酸含浸樹脂自水溶液中吸附錳離子之動力學研究

Kinetics Studies on the Sorption of Manganese Ions from Aqueous Solutions with Di(2-ethylhexyl)phosphoric Acid-Impregnated Resins

王雅琪(Ya-Chi Wang)

指導教授 ： 蔡德華

國立臺北科技大學/工程學院/化學工程所/碩士(2006年)

摘要

本文主要是以含浸二（2－乙基己基）磷酸D2EHPA之 Amberlite XAD-4 ，自硝酸錳水溶液中吸附錳離子之動力學研究。
以丁氧基乙醇(Ethylene glycol monobutyl ether ,EGMBE)為修飾劑，二氯甲烷為稀釋劑，二(2-乙基己基)磷酸(D2EHPA)為萃取劑製備成的含浸樹脂(Extractant- impregnated resin ,EIR)，探討在不同的操作條件下，如改變金屬離子初濃度、不同EIR的使用量及改變溫度，與硝酸錳水溶液萃取平衡後，其金屬離子之吸附情形，並尋求相符的吸附模式。
在此實驗中使用大孔性樹脂Amberlite XAD-4爲載體，將尚未含浸修飾劑及萃取劑的空白樹脂在不同濃度（0.001M~0.02M）的硝酸錳水溶液中進行吸附測試，觀察發現，空白之Amberlite XAD-4對上述各種不同濃度的硝酸錳水溶液，並無明顯吸附錳離子的情形。由此空白實驗可證實樹脂本身僅為支撐體並不參與反應。
最後由實驗結果得知，水溶液中錳離子的含量隨著萃取劑D2EHPA含量的增加而遞增，亦隨著溶液的pH值的增加而遞增，但隨著金屬離子之初濃度增加而減少。
並由結果顯示樹脂萃取錳離子的吸附模式可用Freundlich吸附等溫線來描述之。

關鍵字

萃取 ； 吸附 ； 萃取劑含浸樹脂 ； XAD-4

並列摘要

In this research，we studied the kinetics of the sorption of manganese ions from manganese nitrate aqueous solutions of D2EHPA impregnated Amberlite XAD-4 resin.
In all experiments，we used the ethylene glycol monobutyl ether，EGMBE as the modifier，dichloromethane as the diluent，and D2EHPA as the extractant All of them were rendered into the extractant -impregnated resin，EIR，we examined the effects of various parameter，such as the initial concentration of the metal ions，the amount of EIR and the operating temperature.We investigated the adsorption of metal ions after reaching equilibrium between manganese nitrate aqueous solutions and EIR.
We also tried to fit the experiments data base on available models，we also used Amberlite XAD-4 as a support in the absence of extractant and modifier,investigate its manganese ion adsorption capability. Data from blank experiments revealed that amberlite XAD-4 shows no significant adsorption capability on manganese ions and acted mainly as a support.
Based on the results，it can be concluded that the distribution ratio of Manganese ion increased with increasing in both amount of D2EHPA and pH value of aqueous solutions，but decreased while the initial concentration of manganese ion increased. The results also reveal the adsorption mode of extract manganese ions can be described by the Freundlich isotherm.

並列關鍵字

Extraction ； Sorption ； Extractant D2EHPA -impregnated resin ； XAD-4

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