Sorption experiments

Initially, a piece of the dry membrane was weighed and immersed and left for swelling. The swollen membrane was taken out of the solution, wiped out quickly with a filter paper to remove adherent solvent, and weighed. After the equilibrium was attained the degree of swelling (DS) was calculated (Yuzhong, 1993):

where Wd is the weight of the dry membrane and Ws is the weight of the membrane swollen in the solution. Sorption measurements were derived for single components and for the mixtures containing different concentrations of MTBE in water.

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