以二(2-乙基己基)磷酸含浸樹脂吸附鉛(II)離子之平衡研究

The Adsorption Equilibrium of Lead(II) Ions by Di(2-ethylhexyl) Phosphoric Acid Extractant-impregnated Resins

陳麗萍(Li-Ping Chen)

指導教授 ： 蔡德華

國立臺北科技大學/工程學院/化學工程研究所/碩士(2014年)

摘要

本研究是在利用丁氧基乙醇(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，大孔性樹脂Amberlite XAD-4爲載體，製備成的萃取劑含浸樹脂 (extractant-impregnated resin, EIR)，藉由改變其鉛離子初濃度、EIR量及溫度之操作條件，與硝酸鉛水溶液達吸附平衡後，探討金屬離子之吸附情形及吸附模式。
由實驗數據可知，最佳修飾劑(EGMBE)為4mL。吸附平衡時間大約為600分鐘。在不同濃度的硝酸鉛水溶液下，其鉛離子被吸附量隨著萃取劑D2EHPA含量的增加而增加，而pH值隨EIR吸附量的增加而降低。
由結果顯示樹脂萃取鉛離子的吸附模式適用Freundlich吸附等溫線來描述之。另外，實驗結果經由實驗圖表分析，萃取平衡常數分別為Kex25 = 1.0895*10-5及Kex26 = 2.3703*10-6 (mol/L)-0.5。在此系統鉛之ΔH° = 47602∼70607(J/mol)，ΔG° = -3163∼-4495 (J/mol)，ΔS° = 160.86∼260.77 (J/mol．K)。

關鍵字

鉛離子 ； 吸附 ； 二(2-乙基己基)磷酸 ； Amberlite XAD-4 ； 含浸樹脂

並列摘要

In this study, we used the ethylene glycol monobutyl ether, EGMBE as the modifier, dichloromethane as the diluents, D2EHPA as the extractant and Amberlite XAD-4 as a support. All of them were rendered into the extractant-impregnated resin, EIR, we examined the effects of various parameters, such as the initial metal concentrations, EIR mass and the operating temperature. We examined the adsorption of metal ions and adsorption models after balance.
The data showed the best modifier (EGMBE) was 4ml. The lengths of time to achieve adsorption balance for this system was 600 minutes. In different metal concentrations of solution, A adsorpted mass of Lead ion was increasing with D2EHPA mass. The pH value of solution was decreasing while EIR adsorpted mass was increasing.
The results also reveal the adsorption mode of extract Lead ions can be described by the Freundlich isotherm. Graphical analysis of the results from extraction equilibrium indicates that Lead-D2EHPA complex, in the organic phase with the extraction equilibrium constants of 1.0895*10-5 and 2.3703*10-6 (mol/L)-0.5, respectively.In this system ΔH° = 47602∼70607(J/mol)，ΔG° = -3163∼-4495 (J/mol)，ΔS° = 160.86∼260.77 (J/mol．K).

並列關鍵字

Lead ions ； Adsorption ； Di (2-ethylhexyl) phosphoric acid ； Amberlite XAD-4 ； Extractant-impregnated resin

參考文獻

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