电位法研究外加盐对D354树脂吸附柠檬酸的影响

Effect of Exteral-added Salts on Adsorption of Citric Acid on D354 Resin by Potentiometry

利用电位法跟踪观察D354树脂吸附低浓度柠檬酸溶液的过程,讨论了外加盐浓度对吸附过程的影响。利用固-液界面吸附动力学方程,求取表观吸附速率常数(k),以及吸附剂-吸附质相互作用能(-U)。实验结果表明D354树脂吸附低浓度柠檬酸的过程是遵循单分子层机制进行的,表观吸附速率常数(k)随着外加盐离子浓度的增大而增大。

The absorption behavior of low concentration of citric acid on D354 resin was followed by potentiometry, while the effect of exteral - added salt was studied. The rate constant of apparent adsorption and the interaction energy between adsorbent and adsorbate were evaluated by the kinetic equation of adsorption behavior in solid - liquid system. The experimental results showed that the absorption of low concentration of citric acid on D354 resin obeyed the monomolecular absorption mechanism, the rate constant of apparent absorption and the interaction energy between adsorbent and adsorbate increases as the concentration of the exteral -added salt increases.