Tutorial for adsorption

Is there any tutorial for computing adsorption of molecules on to polymer system under periodic boundary conditions? I am trying to simulate adsorption (GCMC method) of molecules on to a PEO melt using Sorption module. I made the equilibrated melt and also created the sorbate molecule (acetone). When I tried to use the sorption module, all values are coming out to be zero. Any advice on this?