pH值对碱性离子交换树脂吸附富马酸的影响

Effects of pH Value on Adsorption of Basic Ion Exchange Resin on Fumaric Acid

[目的]研究pH值对碱性树脂吸附富马酸的影响。[方法]以4 mg/ml富马酸标准溶液和4款碱性树脂(D2017、17、D301、D318)为材料,考察不同pH值(2.2、2.7、3.2、3.7、4.2、4.75、.2、5.7)条件下,碱性树脂对富马酸的吸附量及溶液pH值(CpH)的变化。[结果]弱碱性离子交换树脂对富马酸的吸附量和CpH均呈S形曲线变化;强碱性离子交换树脂的CpH在2.2≤pH值≤3.7之间呈线性变化,对富马酸的吸附量呈先上升后降低趋势,pH值为3.7左右时对富马酸的吸附量最大,随后逐渐下降。[结论]溶液pH值的变化影响富马酸的离子化程度,进而影响碱性树脂对富马酸的吸附量。

[ Objective ] The aim was to study the effects of pH value on adsorption of basic resin on fumadc acid. [ Method] With 4 mg/ml standard solution of fumaric acid and 4 kinds of basic resin as the materials, the adsorption quantity of basic resin on fumaric acid and the change of pH value of the solution under different pH value of 2.2,2.7,3.2,3.7,4.2,4.7,5.2,5.7 were studied. [Result] The adsorption quantity of weak-basic anionic exchange resin on fumaric acid and the Cpn all showed S curve change. The C18 of strongly basic ion exchange resin showed linear variation when pH value of solution was 2.2- 3.7,and its adsorption quantity on fiunaric acid showed a trend of first increase and then decrease,and the adsorption quantity on fumaric acid was the most when pH value was about 3.7, and then the adsorption quantity on fumaric acid decreased gradually. [ Conclusion ] The change of pH value of solution had effect on degree of ionization of fumaric acid,and then affected the adsorption quantity of basic resin on fumaric acid.