电位法研究弱碱性树脂吸附稀醋酸的行为

Study to Adsorption of Low Concentration Acetic Acid on Weak Base Resin by Potentiometric Determination

利用电位法实验技术跟踪观察弱碱性树脂吸附低浓度醋酸溶液的过程,讨论了酸浓度和外加盐对吸附的影响。利用固-液界面吸附动力学方程,求取表观吸附速率常数(k)。实验结果表明,弱碱性树脂上吸附低浓度醋酸的过程是遵循单分子层机制进行的,表现吸附速率常数(k)随着酯酸浓度的增大而减少;在固定醋酸浓度时,表现吸附速率常数(k)随着外加盐离子浓度的增大而增大。

The processof adsorptionof low concentrationaceticacidon weakbaseresinwas tracedand observedby potentiometricdetermination.Theinfluenceof concentrationof acidandexternal-addedsalton adsorptionwasdiscussed.The apparentadsorptionrateconstantwasobtainedby adsorptionkineticequationof solid-liquidinterfaces.Theexperimental resultsshowedthatlowconcentrationaceticacidis attractedby the weakbaseresinobeysthe formationof monolayer sorption,the apparentadsorptionrateconstantis decreasedwhenthe concentrationof aceticacidis increased,and the apparentadsorptionrate constantis increasedwhenthe concentrationof external-addedsalt is increasedwhilethe concentrationofaceticacidisgiven.