Abstract

The removal and recovery of paraquat from an aqueous solution using a hollow fiber supported liquid membrane (HFSLM) was performed. The extractant was Di-(2-ethylhexyl) phosphoric acid (D2EHPA) which was dissolved in kerosene, whereas the recovery solution was a hydrochloric acid solution. It was found that the pH concentration of D2EHPA, concentration of hydrochloric acid at 8, 4% (v/v), and 1.0 M, respectively, were the optimum conditions. In the one-through mode, 70% and 68% of extraction and recovery, respectively, were achieved, while 99% extraction and recovery were obtained in the circulated mode. In addition, the mathematical model can predict the concentration of paraquat in raffinate solution with different paraquat concentrations and flow rates of feed solution with the R² of 0.923 and 0.843, respectively.

摘要

使用中空纤维支撑液膜（HFSLM）从水溶液中去除和回收百草枯。萃取剂是溶于煤油的二-（2-乙基己基）磷酸（D2EHPA），而回收溶液是盐酸溶液。发现D2EHPA的pH浓度，分别为8、4％（v / v）和1.0 M的盐酸浓度是最佳条件。在单通模式下，分别达到了70％和68％的萃取率和回收率，而在循环模式下获得了99％的萃取率和回收率。此外，该数学模型可以预测具有不同R ^2的百草枯浓度和进料流速的萃余液中百草枯的浓度。 分别为0.923和0.843。