pH值对牛磺酸在阴离子交换树脂上交换平衡的影响

Effect of pH Value on Exchange Equilibrium of Taurine on Anion Exchange Resins

用静态法测定了牛磺酸在201×7和D290阴离子交换树脂上的平衡交换容量，研究了溶液pH值对牛磺酸交换容量的影响，讨论了牛磺酸在阴离子树脂上的交换机理．研究结果表明，溶液pH值对牛磺酸在树脂上的平衡交换容量有明显影响，在酸性范围内，牛磺酸在阴离子交换树脂上的平衡交换容量很小，随着溶液pH值的升高，牛磺酸的平衡交换容量逐渐增大，在溶液pH值为8～9之间时平衡交换容量达到最大．牛磺酸离子交换平衡等温线测定结果显示，随着液相中牛磺酸浓度的升高，牛磺酸在树脂上的交换容量也逐渐增大，但增幅逐渐变缓；牛磺酸在201×7树脂上的交换容量大于其在D290阴离子交换树脂上的平衡交换容量．

The equilibrium uptakes of taurine on anion exchange resins （201 × 7 and D290 ） were determined by means of the static method. The effect of pH value of the solution on the uptake was also investigated. Then, the ion-exchange mechanism of taurine on the anion exchange resins was explained. The results show that the pH value of the solution greatly influences the equilibrium uptake of taurine, and that the equilibrium uptake of taurine, which increases with the pH value and reaches the maximum at pH 8 to 9, is very low in acidic solution. The ionexchange isotherms of taurine on the anion exchange resins indicate that, with the increase of taurine concentration of the solution, the uptake of taurine gradually increases at a low rate, and that the uptake of taurine on the 201 × 7 anion exchange resin is larger than that on the D290 anion exchange resin.