以2-乙基己基膦酸單-2-乙基己基酯含浸樹脂吸附鉻(III)之平衡研究

A Study on the Adsorption Equilibria of Chromium(III) Ions by 2-Ethylhexyl Phosphonic Acid Mono-2-ethylhexyl Ester Extractant-impregnated Resin

賴靖琪(Jing-ci Lai)

指導教授 ： 蔡德華 ； 張裕祺

國立臺北科技大學/工程學院/化學工程研究所/碩士(2011年)

https://doi.org/10.6841/NTUT.2011.00473

摘要

本究在探討利用丁氧基乙醇(ethylene glycol monobutyl ether, EGMBE)為修飾劑，2-乙基己基膦酸單-2-乙基己基酯(PC-88A)為萃取劑，二氯甲烷為稀釋劑，製備成所謂的萃取劑含浸樹脂(extractant-impregnated resin, EIR)，並探討在不同的操作條件下，如改變鉻離子初濃度、不同EIR的使用量及改變其溫度，於萃取平衡後觀察其鉻金屬離子之吸附情形，並尋求相符的吸附模式。
在此實驗我們使用大孔性樹脂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)的硝酸鉻水溶液中進行吸附測試，結果顯示，空白之Amberlite XAD-4對上述各種不同濃度的硝酸鉻水溶液，並無明顯吸附離子的情形。由此空白實驗可證實樹脂本身僅為載體並不會參與反應。
由實驗數據得知，水溶液中鉻離子的含量隨著萃取劑PC-88A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鉻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 ； 2-乙基己基膦酸單-2-乙基己基酯 ； Amberlite XAD-4 ； 萃取劑含浸樹脂(EIR) ； 鉻離子

並列摘要

In this study, we used ethylene glycol monobutyl ether, EGMBE as the modifier, dichloromethane as the diluents, and PC-88A 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 also investigated the adsorption of metal ions after reaching equilibrium between Chromium nitrate aqueous solutions and EIR.
We also tried to fit the experiments data to available models, We also used Amberlite XAD-4 as a support in the absence of extractant and modifier and investigated its chromium ion adsorption capability. Data from blank experiments revealed that Amberlite XAD-4 shows no significant adsorption capability on chromium ions and acted mainly as a support.
Based on the results, it can be concluded that the distribution ratio of chromium ion increased with increasing in both amount of PC-88A and pH value of aqueous solutions, but decreased while the initial concentration of chromium ion increased.The results also showed that the adsorption mode of extract chromium ions can be described by the Freundlich isotherm.

並列關鍵字

Extraction ； Adsorption ； 2-Ethylhexyl Phosphonic Acid Mono-2-ethylhexyl Ester ； Amberlite XAD-4 ； Extractant -impregnated Resin ； Chromium Ions

參考文獻

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