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.