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为考察复合萃取剂萃取两性官能团溶质的协萃机理,以对氨基苯酚(PAP)为分离溶质,三烷基氧膦(TRPO)+二(2 乙基己基)磷酸(D2EHPA)+庚烷为萃取剂进行了萃取平衡特性的研究。结果表明,该萃取剂萃取PAP时,具有明显的协萃效应。协萃机理为TRPO与PAP的中性分子以及D2EPHPA与PAP的中性分子和阳离子反应生成(HP)2·NH2—C6H4—OH·TRPO或者P·NH3—C6H4—OH·TRPO萃合物;萃取剂中D2EHPA与TRPO的适宜协萃比为1∶3;pH是影响萃取能力的关键因素,起始pH值条件下PAP分子形态摩尔分数较大的pH值区域(6—8),分配系数出现极大值;采用适宜的萃取剂组成对PAP的工业生产废水进行处理,可有效去除废水中的PAP和苯胺。
In order to investigate the synergistic mechanism of extraction of amphoteric functional solutes by composite extractant, p-aminophenol (PAP) was used as solute and TRPO + D2EHPA + Agent for the study of the extraction equilibrium characteristics. The results show that the extractant extraction PAP, with significant synergistic effect. The extraction mechanism is that the neutral molecules of PAPP and TRPO react with neutral molecules and cation of D2EPHPA and PAP to form (HP) 2-NH2-C6H4-OH · TRPO or P · NH3-C6H4-OH · TRPO extracts; The optimum extraction ratio of D2EHPA to TRPO is 1: 3. PH is the key factor affecting the extraction ability. The pH value of the PAP molecule with the molar fraction of PAP is larger at initial pH (6-8), and the partition coefficient appears Maximum value; using the appropriate extractant composition of PAP industrial wastewater treatment, which can effectively remove the PAP and aniline wastewater.