本研究是在探討利用丁氧基乙醇(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)為萃取劑製備成的萃取劑含浸樹脂 (Extractant-impregnated resin, EIR),在不同的操作條件下,改變鉻離子初濃度、不同EIR的使用量及改變溫度,與硝酸鉻水溶液吸附平衡後,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鉻離子的吸附模式可用Freundlich吸附等溫線來描述之。在此系統鉻吸附活化能Ea為18.41kJ/mol。
In this paper, we used the ethylene glycol monobutyl ether, EGMBE as the modifier, dichloromethane as the diluents, 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 Chromium 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 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 D2EHPA and pH value of aqueous solutions, but decreased while the initial concentration of Chromium ion increased. The results also reveal the adsorption mode of extract Chromium ions can be described by the Freundlich isotherm. In this system adsorption energy ( Ea ) is 18.41kJ/mol.
為了持續優化網站功能與使用者體驗,本網站將Cookies分析技術用於網站營運、分析和個人化服務之目的。
若您繼續瀏覽本網站,即表示您同意本網站使用Cookies。