【摘要】 合成了N,N′-二(十二烷基)乙二胺(用R2en表示),并用元素分析,红外光谱ESI及1HNMR等方法对其组成及结构进行了分析。研究了在微酸性介质中对铬(Ⅵ)的萃取行为,考察了初始水相酸度、铬(Ⅵ)浓度、R2en浓度、相比及温度等因素对铬(Ⅵ)萃取率的影响。用等摩尔系列法确定了R2en与Cr2O72-的摩尔比为2∶1。用1.0 mol.L-1氢氧化钠溶液对含铬(Ⅵ)有机相进行反萃取,一次反萃率达98.11%。经反萃后的有机相可再循环利用。更多还原

【Abstract】 A new extraction reagent,N′N-di（dodecyl）-ethylenediamine（expressed as R₂en below） was synthesized,and its composition and structure were analyzed and proved by elementary analysis,IR spectrometry,ESI and ¹HNMR.Chloroform solution of R₂en was used in the study of its extraction behavior toward chromium（Ⅵ） ion.Various factors（including acidity of the aqueous solution containing Cr（Ⅵ）,concentration of Cr（Ⅵ） in solution,concentration of R₂en in CHCl₃,ratio of volume of water phase and CHCl₃ phase and temperature of the extraction system） affecting the rate of extraction were tested.Mole ratio of R₂en to Cr（Ⅵ） was found to be 2 to 1.Chromium（Ⅵ） in the organic phase was stripped effectively by 1 mol·L^-1 NaOH solution, and the CHCl₃ was recovered and re-used in succeeding extraction.The rate of back-extraction was 98.11%.更多还原