2-噻吩乙酸在3种树脂上的吸附行为研究

STUDY OF ADSORPTION OF 2-THIOPHENEACETIC ACID ON THREE ADSORBENT RESINS

通过静态吸附实验 ,研究了XAD 4、NDA 10 0和ND 90吸附树脂对水溶液中 2 噻吩乙酸的吸附热力学及动力学特性 ,结果表明 ,2 噻吩乙酸在XAD 4树脂上是单层吸附 ,符合Langmuir等温吸附方程 ,吸附过程符合准一级动力学吸附方程 .2 噻吩乙酸在NDA 10 0和ND 90树脂上的吸附也能用Langmuir等温吸附方程表示 ,但并不只是单层吸附而主要是由毛细管凝聚和微孔填充作用造成的 ,吸附过程可分为大孔和中孔区的吸附以及微孔区的吸附两个阶段 。

Studies on the adsorption thermodynamics and kinetics of 2-thiopheneacetic acid by XAD-4, NDA-100 and ND-90 resins were carried out through static experiments. The results showed that the adsorption of 2-thiopheneacetic acid on XAD-4 resin was a Langmuir monolayer type one, and the adsorption rate implied a first order kinetics. The adsorption data of 2-thiopheneacetic acid on NDA-100 and ND-90 resins were also discribed well by the Langmuir isotherm, which was caused by the capillary condensation and the volume filling of micropores besides the monolayer adsorption. The adsorption of 2-thiopheneacetic acid on NDA-100 and ND-90 resins is carried out in two regions the macropore/mesopore region and the micropore one. The adsorption rates in the two regions both fulfill the first order kinetics.